Using Hierarchy Viewer Components

About Hierarchy Viewer Components

ADF DVT Hierarchy viewer components are used to display hierarchical data, i.e. data that contains master-detail relationships within itself. For example, you could create a hierarchy viewer that renders an organization chart from a data collection that contains information about the relationships between employees in an organization.

Hierarchy viewers use a shape called a node to reference the data in a hierarchy. The shape and content of the nodes is configurable, as well as the visual layout of the nodes. Nodes can display multiple views in a panel card.

Hierarchy Viewer Use Cases and Examples

A hierarchy viewer visually displays hierarchical data and the master-detail relationships. Figure 31-1 shows a segment of a hierarchy viewer component at runtime that includes a control panel, a number of nodes, and links that connect the nodes. The nodes include a panel card that uses af:showDetailItem elements to display multiple sets of data.

Figure 31-1 Hierarchy Viewer Component with Control Panel and Nodes

This image is described in the surrounding text

End User and Presentation Features

The ADF Data Visualization hierarchy viewer component provides a range of features for end users, such as panning and zooming and changing the layout view. It also provides a range of presentation features, such as changing node shape, lines, and labels.

Layouts

You can define the initial layout of the hierarchy viewer when you insert the component on the page from either the Data Controls panel to bind a data collection to the hierarchy viewer component or from the Components window to insert the component and bind to data later.

The layout of nodes in a hierarchy viewer is configurable and includes the following types of layouts:

Vertical top down

Figure 31-2 shows an example of a vertical top down layout.

Figure 31-2 Hierarchy Viewer Vertical Top Down Layout
Vertical bottom up
Horizontal left-to-right

Figure 31-3 shows an example of a horizontal left-to-right layout.

Figure 31-3 Hierarchy Viewer Horizontal Left-to-Right Layout
Horizontal right-to-left
Horizontal, direction depends on the locale
Tree, indented tree

Figure 31-4 shows an example of a tree layout.

Figure 31-4 Hierarchy Viewer Tree Layout
Radial, root node in center and successive child levels radiating outward from their parent nodes
Circle, root node in center and all leaf nodes arranged in concentric circle, with parent nodes arranged within the circle

Figure 31-5 shows an example of a circle layout.

Figure 31-5 Hierarchy Viewer Circle Layout

Navigation

At runtime, the node contains controls that allow users to navigate between nodes and to show or hide other nodes by default. The end user uses the controls on the node to switch dynamically between the content that the panel cards reference.

At runtime, if a user double-clicks another node that has a value specified for its setAnchorListener property, that node becomes the anchor node.

At runtime, when a user moves the mouse over a node at zoom levels less than 76%, a hover window displaying node content at zoom level 100% is automatically displayed, allowing the user to see the full information regardless of zoom level. The controls on the hover window are active.

Panning

By default, panning in a hierarchy viewer is accomplished by clicking and dragging the component to reposition the view, or by using the panning control in the Control Panel.

You can disable the panning effect by setting the panning property to none.

Control Panel

The hierarchy viewer Control Panel provides tools for a user to manipulate the position and appearance of a hierarchy viewer component at runtime.

By default, it appears in a hidden state in the upper left-hand corner of the hierarchy viewer, as illustrated by Figure 31-6.

Figure 31-6 Control Panel in Hidden State

Users click the Hide or Show Control Panel button shown in Figure 31-6 to hide or expand the Control Panel. Figure 31-7 shows the expanded Control Panel.

Figure 31-7 Control Panel in Show State

Table 31-1 describes the functionality that the controls in the Control Panel provide to users. The Panel Selector is automatically enabled if a node in your hierarchy viewer component contains a panel card with af:showDetailItem elements to display additional data. The Layout Selector appears automatically if the hierarchy viewer component uses one of the following layouts:

Vertical top down
Horizontal left to right
Tree
Radial
Circle

Table 31-1 Elements in the Control Panel

Control	Name	Description
	Zoom to Fit	Allows user to zoom a hierarchy viewer component so that all nodes are visible within the viewport.
	Zoom Control	Allows user to zoom the hierarchy viewer component.
	Hide or Show	Hides or shows the Control Panel.
	Panel Selector	If you configured a panel card, displays the list of `af:showDetailItem` elements that you have defined. Users can use the panel selector to show the same panel on all nodes at once.
	Layout Selector	Allows a choice of layouts. Users can change the layout of the hierarchy viewer component from the layout you defined to another one of the layout options presented by the component.

Printing

Hierarchy viewers are printed using the HTML view in the browser.

Bi-directional Support

Hierarchy viewers support bi-directional text in node content, the search panel, and the display of search results. Bi-directional text is text containing text in both text directionalities, both right-to-left (RTL) and left-to-right (LTR). It generally involves text containing different types of alphabets such as Arabic or Hebrew scripts.

Hierarchy viewers also provide bi-directional support for flipping panel cards from one node view to the next and for swapping the locations of the Control Panel and Search Panel if those elements are defined.

State Management

Hierarchy viewers support state management for user actions such as node selection, expansion, and lateral navigation. When a user selects a node, expands a node or navigates to the left or right within the same parent to view the next set of nodes, that state is maintained if the user returns to a page after navigating away, as in a tabbed panel.

State management is supported through hierarchy viewer attributes including disclosedRowKeys, selectedRowKeys, and layout.

Additional Functionality for Hierarchy Viewer Components

You may find it helpful to understand other ADF Faces features before you implement your hierarchy viewer component. Additionally, once you have added a hierarchy viewer component to your page, you may find that you need to add functionality such as validation and accessibility.

Following are links to other functionality that hierarchy viewer components can use:

Partial page rendering: You may want a hierarchy viewer to refresh to show new data based on an action taken on another component on the page. For more information, see Rerendering Partial Page Content.
Personalization: Users can change the way the hierarchy viewer displays at runtime. Those values will not be retained once the user leaves the page unless you configure your application to allow user customization. For information, see Allowing User Customization on JSF Pages.
Accessibility: You can make your hierarchy viewer components accessible. For more information, see Developing Accessible ADF Faces Pages.
Content Delivery: You can configure your hierarchy viewer to fetch a certain number of rows at a time from your data source using the contentDelivery attribute. For more information, see Content Delivery.
Skins and styles: You can customize the appearance of hierarchy viewers using an ADF skin that you apply to the application or by applying CSS style properties directly using a style-related property (styleClass or inlineStyle). For more information, see Customizing the Appearance Using Styles and Skins.
Touch devices: When you know that your ADF Faces application will be run on touch devices, the best practice is to create pages specific for that device. For additional information, see Creating Web Applications for Touch Devices Using ADF Faces.
Automatic data binding: If your application uses the Fusion technology stack, then you can create automatically bound hierarchy viewers based on how your ADF Business Components are configured. For more information, see the "Creating Databound Hierarchy Viewer, Treemap, and Sunburst Components" chapter of Developing Fusion Web Applications with Oracle Application Development Framework.

Note:

If you know the UI components on your page will eventually use ADF data binding, but you need to develop the pages before the data controls are ready, then you should consider using placeholder data controls, rather than manually binding the components. Using placeholder data controls will provide the same declarative development experience as using developed data controls. For more information, see the "Designing a Page Using Placeholder Data Controls" chapter of Developing Fusion Web Applications with Oracle Application Development Framework.

Additionally, data visualization components share much of the same functionality, such as how data is delivered, automatic partial page rendering (PPR), image formats, and how data can be displayed and edited. For more information, see Common Functionality in Data Visualization Components.

Using Hierarchy Viewer Components

To use the Hierarchy Viewer component, add the hierarchy viewer to a page using the Component Palette window. Then define the data for the hierarchy viewer and complete the additional configuration in JDeveloper using the tag attributes in the Properties window. The hierarchy viewer component uses the same data model as the ADF Faces tree component.

A hierarchy viewer component requires data collections where a master-detail relationship exists between one or more detail collections and a master detail collection. You can test whether it is possible to bind a data collection to a hierarchy viewer component by first binding it to an ADF Faces tree component. If you can navigate the data collection using the ADF Faces tree component, it should be possible to bind it to a hierarchy viewer component.

When you add a hierarchy viewer component to a JSF page, JDeveloper adds a tree binding to the page definition file for the JSF page. For information about how to populate nodes in a tree binding with data, see Using Trees to Display Master-Detail Objects in Developing Fusion Web Applications with Oracle Application Development Framework.

The data collections that you bind to nodes in a hierarchy viewer component must contain a recursive accessor if you want users to be able to navigate downward from the root node of the hierarchy viewer component. For information about navigating a hierarchy viewer component, see Configuring Navigation in a Hierarchy Viewer.

Configuring Hierarchy Viewer Components

JDeveloper generates the following elements in JSF pages when you drag and drop components from the Components window onto a JSF page or when you use the Create Hierarchy Viewer dialog to create a hierarchy viewer component as described in the "Creating Databound Hierarchy Viewer, Treemap, and Sunburst Components" chapter of Developing Fusion Web Applications with Oracle Application Development Framework.

Hierarchy viewer (hierarchyViewer): Wraps the node and link elements.
Node (node): A node is a shape that references the data in a hierarchy, for example, employees in an organization or computers in a network. You configure the child elements of the node element to reference whatever data you want to display. The node element supports the use of one or more f:facet elements that display content at different zoom levels (100%, 75%, 50%, and 25%). The f:facet element supports the use of many ADF Faces components, such as af:outputText, af:image, and af:panelGroupLayout, in addition to the ADF Data Visualization panelCard component.

At runtime, the node contains controls that allow users to navigate between nodes and to show or hide other nodes by default. For information about specifying node content and defining zoom levels, see How to Specify Node Content.
Link (link): You set values for the attributes of the link element to connect one node with another node. For information about how to customize the appearance of the link and add labels, see How to Configure the Display of Links and Labels.
Panel card (panelCard): Provides a method to switch dynamically between multiple sets of content referenced by a node element using animation by, for example, horizontally sliding the content or flipping a node over.

The f:facet tag for each zoom level supports the use of a dvt:panelCard element that contains one or more af:showDetailItem elements defining the content to be displayed at the specified zoom level. At runtime, the end user uses the controls on the node to switch dynamically between the content that the af:showDetailItem elements reference. For more information, see Using Panel Cards.

Note:

Unlike the other elements, the dvt:panelCard element is not generated if you choose the default quick layout option when using the Components window to create a hierarchy viewer.

How to Add a Hierarchy Viewer to a Page

You use the Components window to add a hierarchy viewer to a JSF page. When you drag and drop a hierarchy viewer component onto the page, the Create Hierarchy Viewer dialog displays available categories of hierarchy viewer layouts, with descriptions, to provide visual assistance when creating hierarchy viewers.

Figure 31-8 shows the Create Hierarchy Viewer dialog for hierarchy viewers with the vertical top down layout type selected.

Figure 31-8 Create Hierarchy Viewer Dialog

Description of "Figure 31-8 Create Hierarchy Viewer Dialog"

Once you select the hierarchy viewer layout, and the hierarchy viewer is added to your page, you can use the Properties window to specify data values and configure additional display attributes for the hierarchy viewer. Alternatively, you can choose to bind the data during creation and use the Properties window to configure additional display attributes.

In the Properties window you can click the icon that appears when you hover over the property field to display a property description or edit options. Figure 31-9 shows the dropdown menu for a hierarchy viewer component Value attribute.

Figure 31-9 Hierarchy Viewer Value Attribute Dropdown Menu

Description of "Figure 31-9 Hierarchy Viewer Value Attribute Dropdown Menu"

Note:

If your application uses the Fusion technology stack, then you can use data controls to create a hierarchy viewer and the binding will be done for you. For more information, see the "Creating Databound Hierarchy Viewer, Treemap, and Sunburst Components" section in Developing Fusion Web Applications with Oracle Application Development Framework

Before you begin:

It may be helpful to have an understanding of how hierarchy viewer attributes and hierarchy child tags can affect functionality. For more information, see Configuring Hierarchy Viewer Components.

You may also find it helpful to understand functionality that can be added using other ADF Faces features. For more information, see Additional Functionality for Hierarchy Viewer Components.

You must complete the following tasks:

Create an application workspace as described in Creating an Application Workspace.
Create a view page as described in Creating a View Page.

To add a hierarchy viewer to a page:

In the ADF Data Visualizations page of the Components window, from the Hierarchy Viewer panel, drag and drop a Hierarchy Viewer onto the page to open the Create Hierarchy Viewer dialog.

Use the dialog to select the hierarchy viewer layout type. For help with the dialog, click Help or press F1.
In the Create Hierarchy Viewer dialog, click OK to add the hierarchy viewer to the page.

Optionally, use the dialog to bind the hierarchy viewer by selecting Bind Data Now and navigating to the ADF data control that represents the data you wish to display on the treemap. If you choose this option, the data binding fields in the dialog will be available for editing. For help with the dialog, press F1 or click Help.
In the Properties window, view the attributes for the hierarchy viewer. Use the Help button to display the complete tag documentation for the hierarchyViewer component.
Expand the Common section. Use this section to set the following attributes:
- Layout: Specify the hierarchical layout of the hierarchy viewer. For a description with illustration of the valid values, see Layouts.
- Ancestor Levels (show sub-menu): Use to set the displayLevelsAncestor attribute that specifies the number of ancestor levels to display during initial render. This property is zero-based. A value of 0 means that no ancestor levels above the root will be shown. The default value is 0.
- Descendent Levels (show sub-menu): Use to set the displayLevelsChildren attribute that specifies the number of child levels to display during initial render. This property is zero-based. A value of 0 means that no child levels below the root will be shown; the root itself will be shown. The default value is 1, which means that the root and the first level of children will be shown.
  
  Note:
  
  You can also use the disclosedRowKeys attribute to specify the number of child levels to display during initial render. If you specify both disclosedRowKeys and displayLevelsChildren attributes, the disclosedRowKeys attribute takes precedence over displayLevelsChildren.
- Nodes Per Level (show sub-menu): Use to set the levelFetchSize attribute that specified the number of child nodes that will be fetched and displayed at a single time for each expanded parent node. Additional child nodes may be fetched and displayed by using the lateral navigation controls shown in the hierarchy viewer. The default value is 25.
Expand the Hierarchy Viewer Data section. Use this section to set the following attributes:
- Value: Specify the data model for the hierarchy viewer; can be an instance of javax.faces.TreeModel.
- Var: Specify the variable used to reference each element of the hierarchy viewer data collection. Once this component has completed rendering, this variable is removed or reverted back to its previous value.
Expand the Appearance section. Use this section to set the following attributes:
- Summary: Enter a description of the hierarchy viewer. This description is accessed by screen reader users.
- EmptyText: Specify the text to display when a hierarchy viewer does not display data.
Expand the Behavior section. Use this section to set the following attributes:
- ControlPanelBehavior: Specify the behavior of the Control Panel. For more information, see How to Configure the Display of the Control Panel.
- Panning: Specify panning behavior. The default value is auto for click and drag panning. You can also set it to none to disable panning.

What Happens When You Add a Hierarchy Viewer to a Page

When a hierarchy viewer component is inserted into a JSF page using the Create Hierarchy Viewer dialog, a set of child tags that support customization of the hierarchy viewer is automatically inserted. The hierarchy viewer component uses elements such as af:panelGroupLayout, af:spacer, and af:separator to define how content is displayed in the nodes.

The example below shows the code generated when the component is created by insertion from the Components window. Code related to the hierarchy viewer elements is highlighted in the example.

<dvt:hierarchyViewer id="hv1" layout="hier_vert_top" styleClass="AFStretchWidth">
  <dvt:link linkType="orthogonalRounded" id="l1"/>
  <dvt:node width="233" height="330" id="n1">
    <f:facet name="zoom100">
      <af:panelGroupLayout layout="vertical"
                 styleClass="AFStretchWidth AFHVNodeStretchHeight AFHVNodePadding"
                 id="pgl1">
        <af:panelGroupLayout layout="horizontal" id="pgl2">
          <af:panelGroupLayout styleClass="AFHVNodeImageSize" id="pgl3">
            <af:image source="#{null}" styleClass="AFHVNodeImageSize" id="i1"/>
          </af:panelGroupLayout>
          <af:spacer width="5" height="5" id="s1"/>
          <af:panelGroupLayout layout="vertical" id="pgl4">
            <af:outputText value=" attribute value1
                           styleClass="AFHVNodeTitleTextStyle" id="ot1"/>
            <af:outputText value=" attribute value2"
                           styleClass="AFHVNodeSubtitleTextStyle" id="ot2"/>
            <af:outputText value=" attribute value3"
                           styleClass="AFHVNodeTextStyle" id="ot3"/>
          </af:panelGroupLayout>
        </af:panelGroupLayout>
        <af:spacer height="5" id="s2"/>
        <af:separator id="s3"/>
        <af:spacer height="5" id="s4"/>
        <dvt:panelCard effect="slide_horz" styleClass="AFHVNodePadding" id="pc1">
          <af:showDetailItem text="first group title " id="sdi1">
            <af:panelFormLayout styleClass="AFStretchWidth AFHVNodeStretchHeight AFHVNodePadding"
                               id="pfl1">
              <af:panelLabelAndMessage label="attribute label4"
                               styleClass="AFHVPanelCardLabelStyle" id="plam1">
                <af:outputText value="attribute value4"
                               styleClass="AFHVPanelCardTextStyle" id="ot4"/>
              </af:panelLabelAndMessage>
              <af:panelLabelAndMessage label="attribute label5"
                               styleClass="AFHVPanelCardLabelStyle" id="plam2">
                <af:outputText value="attribute value5"
                               styleClass="AFHVPanelCardTextStyle" id="ot5"/>
              </af:panelLabelAndMessage>
              <af:panelLabelAndMessage label="attribute label6"
                               styleClass="AFHVPanelCardLabelStyle" id="plam3">
                <af:outputText value="attribute value6"
                               styleClass="AFHVPanelCardTextStyle" id="ot6"/>
              </af:panelLabelAndMessage>
            </af:panelFormLayout>
          </af:showDetailItem>
          <af:showDetailItem text="second group title " id="sdi2">
            <af:panelFormLayout styleClass="AFStretchWidth AFHVNodeStretchHeight AFHVNodePadding"
                               id="pfl2">
              <af:panelLabelAndMessage label="attribute label7"
                               styleClass="AFHVPanelCardLabelStyle" id="plam4">
                <af:outputText value="attribute value7"
                               styleClass="AFHVPanelCardTextStyle" id="ot7"/>
              </af:panelLabelAndMessage>
              <af:panelLabelAndMessage label="attribute label8"
                               styleClass="AFHVPanelCardLabelStyle" id="plam5">
                <af:outputText value="attribute value8"
                               styleClass="AFHVPanelCardTextStyle" id="ot8"/>
              </af:panelLabelAndMessage>
              <af:panelLabelAndMessage label="attribute label9"
                               styleClass="AFHVPanelCardLabelStyle" id="plam6">
                <af:outputText value="attribute value9"
                               styleClass="AFHVPanelCardTextStyle" id="ot9"/>
              </af:panelLabelAndMessage>
            </af:panelFormLayout>
          </af:showDetailItem>
        </dvt:panelCard>
      </af:panelGroupLayout>
    </f:facet>
  </dvt:node>
</dvt:hierarchyViewer>

What You May Need to Know About Hierarchy Viewer Rendering and Image Formats

By default, the hierarchy viewer component renders in HTML5. When HTML5 is not supported by the browser and Flash 10 or higher is available on the client, the hierarchy viewer is rendered in a Flash Player. If HTML5 and Flash10 or higher are not available, the hierarchy viewer is rendered in HTML4. While HTML4 rendering follows HTML5 and Flash rendering as closely as possible, there are some differences.

For the most part, hierarchy viewer display and features are supported with the following exceptions:

Isolate and restore nodes is not available.
Node shapes are limited to rectangular.
For links, the link end connector is not supported, link type is limited to orthogonal, and link style is limited to a solid line.
For the control panel, all panel cards cannot be switched, panning is limited to scroll bars, and zooming and zoom to fit is limited to four zoom facets.
Search is not supported.
Emailable page is not supported.
Node detail hover window is not supported.

Managing Nodes in a Hierarchy Viewer

A node is a shape that represents the individual elements in an ADF DVT hierarchy viewer component at runtime. Examples of individual elements in a hierarchy viewer component include an employee in an organization chart or a computer in a network diagram.

By default, each node in a hierarchy viewer component includes controls that allow users to do the following:

Navigate to other nodes in a hierarchy viewer component.

The top of each node contains a single Isolate or Restore button. The Isolate button allows the user to reduce the hierarchy temporarily to the chosen node and its displayed children. Users click Restore to return the hierarchy to the original view.
Show or hide child nodes of the currently selected node in a hierarchy viewer component.

The single Show or Hide button appears on the bottom of every node. When a user clicks one of these icons, the page displays or hides the node's children if they exist, and the component generates a RowDisclosureEvent event. You can register a custom rowDisclosureListener method to handle any processing in response to the event in the same way as an af:tree component. For more information, see What You May Need to Know About Programmatically Expanding and Collapsing Nodes.

If you use a panel card to display different sets of information for the node that the hierarchy viewer component references, controls at the bottom of the node allow the user to change the information set in the active node. For more information, see Using Panel Cards.

Figure 31-10 shows an example of a node with controls that allow an end user to isolate the node as the anchor node, show the child nodes, and change the node to show different sets of information in the active node. For information about how to configure the controls on a node, see How to Configure the Controls on a Node.

Figure 31-10 Hierarchy Viewer Node Controls

How to Specify Node Content

Although a node contains controls by default that allow you to navigate to a node and show or hide nodes, nodes do not by default include content unless you used a quick start layout when creating the hierarchy viewer component. You must define what content a node renders at runtime.

You can specify node content when you associate data bindings with the hierarchy viewer component as described in the "Creating Databound Hierarchy Viewer, Treemap, and Sunburst Components" chapter of Developing Fusion Web Applications with Oracle Application Development Framework. You can also specify content that is stored in a managed bean.

By default, a hierarchy viewer component that you create contains one node with one facet element that has a zoom level of 100%:

<f:facet name="zoom100"/>

You can insert three more instances of the facet element into the hierarchy viewer component with the following zoom levels:

25%: zoom25
50%: zoom50
75%: zoom75

Use these zoom level definitions to improve readability of node content when the hierarchy viewer is zoomed out to display more nodes and less display room is available in each node. You can define a subset of the available data collection within one or more of the facet elements. For example, if you have a data collection with node attributes that reference data about a company department such as its name, location, and number, you can specify a facet element with a zoom level of 50% that references the node attribute for just the department's name and number.

At runtime, when a user moves the mouse over a node at any zoom level less than 76%, a hover window displaying node content at zoom level 100% is automatically displayed, allowing the user to see the full information regardless of zoom level. The controls on the hover window are active.

Each of the facet elements that you insert can be used to reference other components. You can use one or more of the following ADF Faces components when you define content for a node in a hierarchy viewer component. The node component's facet support the following components:

Layout components including: af:panelFormLayout, af:panelGroupLayout, af:separator, af:showDetailItem, and af:spacer. For more information about using these components, see Organizing Content on Web Pages.
Menu components including: af:menu and af:menuItem. For more information about these components, see Using Menus, Toolbars, and Toolboxes.
Output components including: af:outputFormatted and af:outputText. For more information about these components, see Using Output Components.
Message component af:panelLabelAndMessage. For more information about this component, see Displaying Tips, Messages, and Help.
Navigation components including: af:button, af:link, and af:commandMenuItem. For more information about these components, see Working with Navigation Components.
Image component af:image. For information about how to use the af:image component, see Including Images in a Hierarchy Viewer.
af:showPopupBehavior: For information about how to use the af:showPopupBehavior component, see Configuring a Hierarchy Viewer to Invoke a Popup Window.
Hierarchy viewer child component dvt:panelCard: For information about how to use the dvt:panelCard component, see Using Panel Cards.

Note:

Unsupported components are flagged at design time.

By default, the hierarchy viewer component renders in HTML5. When HTML5 is not available, the hierarchy viewer will render in Flash or HTML4, and certain properties that you specify as node content may not be supported. For more information, see What You May Need to Know About Hierarchy Viewer Rendering and Image Formats.

Before you begin:

It may be helpful to have an understanding of how hierarchy viewer attributes and hierarchy viewer child tags can affect functionality. For more information, see Configuring Hierarchy Viewer Components.

You may also find it helpful to understand functionality that can be added using other ADF Faces features. For more information, see Additional Functionality for Hierarchy Viewer Components.

You should already have a hierarchy viewer on your page. If you do not, follow the instructions in this chapter to create a hierarchy viewer. For more information, see How to Add a Hierarchy Viewer to a Page.

To add a node to a hierarchy viewer component:

In the Structure window, right-click the dvt:hierarchyViewer node and choose Insert Inside Hierarchy Viewer > Node.
The following entry appears in the JSF page:
```
<dvt:node>
  <f:facet name="zoom100"/>
</dvt:node>
```
In the Structure window, right-click dvt:node and choose Go to Properties.
Configure the appropriate properties in the Properties window.
For example, set a value for the Type property to associate a node component with an accessor. The following code appears in the JSF page if you associate model.HvtestView with the node:
```
<dvt:node type="model.HvtestView"/>
```
For more information, see Specifying a Node Definition for an Accessor.

How to Configure the Controls on a Node

The node component (node) exposes a number of properties that allow you to determine if controls such as Restore, Isolate, Show, or Hide appear at runtime. It also exposes properties that determine the size and shape of the node at runtime.

Before you begin:

It may be helpful to have an understanding of how hierarchy viewer attributes and hierarchy child tags can affect functionality. For more information, see Configuring Hierarchy Viewer Components.

You may also find it helpful to understand functionality that can be added using other ADF Faces features. For more information, see Additional Functionality for Hierarchy Viewer Components.

You should already have a hierarchy viewer node on your page. If you do not, follow the instructions in this chapter to add a node to a hierarchy viewer. For more information, see How to Specify Node Content.

To configure the controls on a node:

In the Structure window, right-click dvt:node and choose Go to Properties.

In the Properties window, in the Appearance section, configure properties for the node, as described in Table 31-2.

Table 31-2 Node Configuration Properties

To do this:	Set the following value for this property:
Configure the Hide or Show controls to appear or not on a node.	Set `showExpandChildren` to `False` to hide the controls. By default the property is set to `True`.
Configure the Restore or Isolate controls to appear or not on the node.	Set the `showIsolate` property to `False` to hide these controls on the node. By default the property is set to `true`.
Configure the Navigate Up control to appear or not on the node.	Set the `showNavigateUp` property to `False` to hide this control on the node. By default the property is set to `true`. If the `showNavigateUp` property is set to `true`, for the control to render, you must also set a value for the hierarchy viewer component's `navigateUpListener` property, as described in How to Configure Upward Navigation in a Hierarchy Viewer.
Configure the height and width of a node.	Set values for the `width` and `height` properties.
Select the shape of the node.	Select a value from the Shape dropdown list. Available values are: `ellipse` `rect` `roundedRect` (default)

For information about configuring the properties in the Style section of the Properties window for the node component, see Changing the Style Properties of a Component .

The hover detail window is automatically displayed when the user moves the mouse over the node at zoom levels less than 76%, reflecting the shape attribute set for the node. A node with the shape attribute roundedRect, for example, will have a hover window with the same attribute, as shown in Figure 31-11.

You can disable the display of the detail window when hovering a node that is not at the 76-100% zoom level. For more information, see How to Disable the Hover Detail Window.

Figure 31-11 Hover Window in Hierarchy Viewer Node

Specifying a Node Definition for an Accessor

By default, you associate a node component with an accessor when you use the Create Hierarchy Viewer dialog to create a hierarchy viewer component, as described in the "Creating Databound Hierarchy Viewer, Treemap, and Sunburst Components" chapter of Developing Fusion Web Applications with Oracle Application Development Framework. The Create Hierarchy Viewer dialog sets the node component's type property to a specific accessor.

You can configure a node component's type property to use one or more specified accessors. Alternatively, you can configure a node component's rendered property to use a node definition across accessors, as described in Associating a Node Definition with a Particular Set of Data Rows. When the hierarchy viewer component determines which node definition to use for a particular data row, it first checks for a match on the type property:

If the type property matches and the rendered property value is true (default), the hierarchy viewer component uses the node definition.
If the type property does not match, the hierarchy viewer component uses the first node definition whose rendered property evaluates to true. The result of evaluating the rendered property does not affect the type property.

Associating a Node Definition with a Particular Set of Data Rows

You can use a node component's rendered property to associate the node with a particular set of data rows or with a single data row. The rendered property accepts a boolean value so you can write an EL expression that evaluates to true or false to determine what data rows you associate with a node definition.

For example, assume that you want a node to display data based on job title. You write an EL expression for the node component's rendered property similar to the following pseudo EL expression that evaluates to true when a job title matches the value you specify (in this example, CEO):

rendered="#{node.title == 'CEO'}"

When you use the node component's rendered property in this way, you do not define a value for the node component's type property.

Note:

The hierarchy viewer will use the first node definition whose rendered property evaluates to true. The order of the hierarchy viewer's node definitions is important.

How to Specify Ancestor Levels for an Anchor Node

The anchor node of a hierarchy viewer component is the root of the hierarchy returned by the tree binding. Depending on the use case, there can be multiple root nodes, for example, a hierarchy viewer component that renders an organization chart with one or more managers. When a hierarchy viewer component renders at runtime, the node that has focus is the anchor node. If a user double-clicks another node at runtime that has a value specified for its setAnchorListener property, that node becomes the anchor node.

You can configure the hierarchy viewer to display one or more levels above the anchor node, the ancestor levels. For example, if you search for an employee in a company, you may wish to display the chain of management above the employee. Specify ancestor levels using the displayLevelsAncestor property.

Before you begin:

It may be helpful to have an understanding of how hierarchy viewer attributes and hierarchy child tags can affect functionality. For more information, see Configuring Hierarchy Viewer Components.

You may also find it helpful to understand functionality that can be added using other ADF Faces features. For more information, see Additional Functionality for Hierarchy Viewer Components.

You should already have a hierarchy viewer on your page. If you do not, follow the instructions in this chapter to add a hierarchy viewer to your page. For more information, see How to Add a Hierarchy Viewer to a Page.

To specify the number of ancestor levels for an anchor node:

In the Structure window, right-click the dvt:hierarchyViewer node and choose Go to Properties.
Expand the Common section of the Properties window.
In the Ancestor Levels field, specify the number of levels of ancestor nodes that you want to appear at runtime.

For example, the following entry appears in the JSF page if you entered 2 as the number of ancestor levels for the anchor node.

displayLevelsAncestor="2"
Save changes to the JSF page.

Using Panel Cards

You can use the ADF panel card component in conjunction with the ADF DVT hierarchy viewer component to hold different sets of information for the nodes that the hierarchy viewer component references. The panel card component is an area inside the node element that can include one or more af:showDetailItem elements.

Each of the af:showDetailItem elements references a set of content. For example, a hierarchy viewer component that renders an organization chart would include a node for employees in the organization. This node could include a panel card component that references contact information using an af:showDetailItem element and another af:showDetailItem element that references salary information.

A panel card component displays the content referenced by one af:showDetailItem element at runtime. The panel card component renders navigation buttons and other controls that allow the user to switch between the sets of data referenced by af:showDetailItem elements. The controls that allow users to switch between different sets of data can be configured with optional transitional effects. For example, you can configure a panel card to horizontally slide between one set of data referenced by an af:showDetailItem element to another set of data referenced by another af:showDetailItem element.

How to Create a Panel Card

You can insert a panel card component into the JSF page that renders the hierarchy viewer component by using the context menu that appears when you select the Facet zoom element in the Structure window for the JSF page.

Before you begin:

It may be helpful to have an understanding of how hierarchy viewer attributes and hierarchy child tags can affect functionality. For more information, see Configuring Hierarchy Viewer Components.

You may also find it helpful to understand functionality that can be added using other ADF Faces features. For more information, see Additional Functionality for Hierarchy Viewer Components.

You should already have a hierarchy viewer on your page. If you do not, follow the instructions in this chapter to create a hierarchy viewer. For more information, see How to Add a Hierarchy Viewer to a Page.

To create a panel card:

In the Structure window, right-click the zoom level within the node where you want to create a panel card.

For example, select f:facet - zoom100.
If the selected facet does not already contain a panelGroupLayout component, select Insert Inside zoomLevel > Panel Group Layout to create a container for the panel card.
Use the Properties window to configure the properties of the panel group layout.

For more information about configuring panel group layout components, see How to Use the panelGroupLayout Component.
In the Structure window, right-click the af:panelGroupLayout node and select Insert Inside Panel Group Layout > Panel Card.
Use the Properties window to configure the panel card's properties.
For example, set a value for the Effect property in the Advanced properties for the panel card component to specify the effect used when transitioning between content on the panel card. Valid values are:
- slideHorz (default)
  
  Old content slides out on one side while new content slides in from the other side.
- immediate
  
  Content displays immediately with no transition effect.
- flipHorz
  
  The showDetailItem flips over to reveal new contents.
- nodeFlipHorz
  
  The entire node flips over to reveal new contents.
- cubeRotateHorz
  
  The showDetailItem rotates as if on the face of a cube to reveal new contents.
- nodeCubeRotateHorz
  
  The entire node rotates as if on the face of a cube to reveal new contents.
Note:

Valid values also include slide_horz, flip_horz, node_flip_horz, cube_rotate_horz, and node_cube_rotate_horz. These values are deprecated in favor of the mixed case values, but you may still see them in use in older code and documentation.
In the Structure window, right-click dvt:panelCard and choose Insert Inside Panel Card > Show Detail Item.
Use the Properties window to configure the properties of the af:showDetailItem element. For help with the Properties window, click Help or press F1.
Add elements to the af:showDetailItem element to display the desired content. In the Structure window, right-click af:showDetailItem and choose the element to insert.

For example, if your hierarchy viewer renders an organization chart, you could add an element to display the employee's ID. In the Structure window, right-click af:showDetailItem and choose Insert Inside Show Detail Item > ADF Faces > Output Text.
Use the Properties window to configure the properties for the elements you added to the af:showDetailItem element in Step 8. For help with the Properties window, click Help or press F1.
Repeat Step 6 through Step 9 for each set of content that you want the panel card to display.

What Happens at Runtime: How the Panel Card Component Is Rendered

At runtime, a node appears and displays one panel card component. Users can click the navigation buttons at the bottom of the panel card to navigate to the next set of content referenced by one of the panel card's af:showDetailItem child elements.

Figure 31-12 shows a node with a panel card component where two different af:showDetailItem child elements reference different sets of information (Contact and Address). The controls in the example include arrows to slide through the panel cards as well as buttons to directly select the panel card to display. Tooltips display for both control options.

Figure 31-12 Runtime View of a Node with a Panel Card

Configuring Navigation in a Hierarchy Viewer

By default, an ADF DVT hierarchy viewer component has downward navigation configured for root and inner nodes. You can configure the hierarchy viewer component to enable upward navigation and to determine the number of nodes to appear when a user navigates between nodes on the same level.

For more information about node types, see Managing Nodes in a Hierarchy Viewer.

How to Configure Upward Navigation in a Hierarchy Viewer

If you want to configure upward navigation for a hierarchy view component, you configure a value for the hierarchy viewer component's navigateUpListener property.

Before you begin:

It may be helpful to have an understanding of how hierarchy viewer attributes and hierarchy viewer child tags can affect functionality. For more information, see Configuring Hierarchy Viewer Components.

You may also find it helpful to understand functionality that can be added using other ADF Faces features. For more information, see Additional Functionality for Hierarchy Viewer Components.

You should already have a hierarchy viewer on your page. If you do not, follow the instructions in this chapter to create a hierarchy viewer. For more information, see How to Add a Hierarchy Viewer to a Page.

To configure upward navigation for a hierarchy viewer component:

In the Structure window, right-click the dvt:hierarchyViewer node and choose Go to Properties.
In the Properties window, expand the Behavior section of the Properties window and write a value in the Navigate Up field for the hierarchy viewer component's navigateUpListener property that specifies a method to update the data model so that it references the new anchor node when the user navigates up to a new anchor node.

If you need help specifying a value, choose Method Expression Builder from the Navigate Up dropdown menu to enter the Method Expression Builder dialog. For help with the Method Expression Builder dialog, click Help or press F1.
Save the page.

How to Configure Same-Level Navigation in a Hierarchy Viewer

Same-level navigation between the nodes in a hierarchy viewer component is enabled by default. You can configure the hierarchy viewer component to determine how many nodes to display at a time.

When you do this, controls appear that enable users to navigate to the following:

Left or right to view the next set of nodes
First or last set of nodes in the collection of available nodes

Before you begin:

It may be helpful to have an understanding of how hierarchy viewer attributes and hierarchy viewer child tags can affect functionality. For more information, see Configuring Hierarchy Viewer Components.

You may also find it helpful to understand functionality that can be added using other ADF Faces features. For more information, see Additional Functionality for Hierarchy Viewer Components.

You should already have a hierarchy viewer on your page. If you do not, follow the instructions in this chapter to create a hierarchy viewer. For more information, see How to Add a Hierarchy Viewer to a Page.

To configure same-level navigation in a hierarchy viewer component:

In the Structure window, right-click the dvt:hierarchyViewer node and choose Go to Properties.
Expand the Common section of the Properties window and specify the number of nodes that you want to appear at runtime in the Nodes Per Level field (levelFetchSize).

For example, the following entry appears in the JSF page if you entered 3 as the number of nodes:

levelFetchSize="3"
Save the page.

What Happens When You Configure Same-Level Navigation in a Hierarchy Viewer

At runtime, the hierarchy viewer component renders the number of nodes that you specified as a value for the hierarchy viewer component's levelFetchSize property. It also renders controls that allow users to do the following:

Navigate to the left or right to view the next set of nodes
Navigate to the first or last set of nodes in the collection of available nodes

Figure 31-13 shows a runtime example where levelFetchSize="3". When a user moves the mouse over the control, as shown in the circled area in Figure 31-13, the control that allows users to navigate to the last set of nodes appears.

Figure 31-13 Hierarchy Viewer Component with Same-Level Navigation

Customizing the Appearance of a Hierarchy Viewer

You can customize the ADF DVT hierarchy viewer component size and appearance including adding images, configuring the display of the control panel and hover detail window, and customizing links and labels.

You can change the appearance of your hierarchy viewer component by changing skins and component style attributes, as described in Customizing the Appearance Using Styles and Skins.

How to Adjust the Display Size and Styles of a Hierarchy Viewer

You can configure the hierarchy viewer's size and style using the inlineStyle and styleClass attributes. Both attributes are available in the Style section in the Properties window for the dvt:hierarchyViewer or dvt:node component. Using these attributes, you can customize stylistic features such as fonts, borders, and background elements.

The styleClass attribute is a CSS style class selector used to group a set of inline styles. The style classes can be defined using an EL Expression that evaluates to a style class at runtime. You can also specify an ADF public style class. For example, you can use AFHVNodeImageSize to set the size of an image to fit inside a hierarchy viewer.

The inlineStyle attribute is a list of CSS styles, separated by semicolons, that can set individual style attributes. For example, you can specify color:blue;font-style:italic to change the color and font style of an af:outputText component.

For additional information about using the styleClass and inlineStyle attributes, see Changing the Style Properties of a Component .

The page containing the hierarchy viewer may also impose limitations on the ability to change the size or style. For more information about page layouts, see Organizing Content on Web Pages.

Before you begin:

It may be helpful to have an understanding of how hierarchy viewer attributes and hierarchy viewer child tags can affect functionality. For more information, see Configuring Hierarchy Viewer Components.

You may also find it helpful to understand functionality that can be added using other ADF Faces features. For more information, see Additional Functionality for Hierarchy Viewer Components.

You should already have a hierarchy viewer on your page. If you do not, follow the instructions in this chapter to create a hierarchy viewer. For more information, see How to Add a Hierarchy Viewer to a Page.

To adjust the size or style of a hierarchy viewer:

In the Structure window for the JSF page that contains the hierarchy viewer component, right-click the dvt:hierarchyViewer node and choose Go to Properties.
To adjust the size or style of the hierarchy viewer using inline styles, in the Properties window, expand the Style section and specify the following values for the InlineStyle property:
- width
  
  Write a value in percent (%) or pixels (px). The default value for width is 100%.
- height
  
  Write a value in percent (%) or pixels (px). The default value for height is 600px.
The final value that you enter for InlineStyle must use this syntax:

width:100%;height:600px;
To adjust the size or style of the hierarchy viewer using style classes, in the Properties window, specify a value for the StyleClass property.

For example, to specify 100% for the height of the hierarchy viewer, enter the following for StyleClass: AFStretchHeight.
Save changes to the JSF page.

Including Images in a Hierarchy Viewer

You can configure a hierarchy viewer component to display images in the nodes of a hierarchy viewer component at runtime. This can be useful where, for example, you want pictures to appear in an organization chart.

Insert an af:image component with the source attribute bound to the URL of the desired image. The following code example renders an image.

<af:panelGroupLayout>
  <af:image source="/person_id=#{node.PersonId}"
            shortDesc="Employee Image"
            styleClass=AFHVNodeImageSize"/>
</af:panelGroupLayout>

For more information about the af:panelGroupLayout component, see How to Use the panelGroupLayout Component.

How to Configure the Display of the Control Panel

Although you cannot configure the Control Panel to appear in another location, you can configure the hierarchy viewer component to act as follows when the hierarchy viewer component renders at runtime:

Appears in an expanded or show state
Appears in a collapsed or hidden state
Does not appear to users

Before you begin:

It may be helpful to have an understanding of how hierarchy viewer attributes and hierarchy viewer child tags can affect functionality. For more information, see Configuring Hierarchy Viewer Components.

You may also find it helpful to understand functionality that can be added using other ADF Faces features. For more information, see Additional Functionality for Hierarchy Viewer Components.

You should already have a hierarchy viewer on your page. If you do not, follow the instructions in this chapter to create a hierarchy viewer. For more information, see How to Add a Hierarchy Viewer to a Page.

To configure the display of the Control Panel:

In the Structure window, right-click the dvt:hierarchyViewer node and choose Go to Properties.
In the Properties window, expand the Appearance section and choose one of the following values from the ControlPanelBehavior dropdown list:
- hidden
  
  Select this value if you do not want the Control Panel to appear at runtime.
- initCollapsed
  
  This is the default value. The Control Panel appears in a collapsed or hidden state at runtime.
- initExpanded
  
  Select this value if you want the Control Panel to appear in an expanded or show state at runtime.
Save changes to the JSF page.

How to Configure the Display of Links and Labels

In a hierarchy viewer the relationships between nodes are represented by lines that link the nodes. The links can be configured to include labels.

Figure 31-14 illustrates links and labels in a hierarchy viewer.

Figure 31-14 Hierarchy Viewer Links and Labels

You can customize the appearance of links and labels by setting properties of the dvt:link element in a hierarchy viewer. Figure 31-15 illustrates links with a dashDot value set for the linkStyle attribute.

Figure 31-15 Links with dashDot Link Style

Before you begin:

It may be helpful to have an understanding of how hierarchy viewer attributes and hierarchy viewer child tags can affect functionality. For more information, see Configuring Hierarchy Viewer Components.

You may also find it helpful to understand functionality that can be added using other ADF Faces features. For more information, see Additional Functionality for Hierarchy Viewer Components.

You should already have a hierarchy viewer on your page. If you do not, follow the instructions in this chapter to create one. For more information, see How to Add a Hierarchy Viewer to a Page.

To customize the display of links and labels:

In the Structure window, right-click the dvt:link node and choose Go to Properties.
In the Properties window, set the following attributes to customize the appearance of links between nodes in a hierarchy viewer as desired:
- LinkStyle: Sets the style of the link, for example, dotted or dashed line.
- LinkColor: Sets the color of the link.
- LinkWidth: Sets the width of the link, in pixels.
- LinkType: Sets the type of link, for example, direct line or smooth curved line fitted to what would have been a single right angle.
- EndConnectorType: Sets the style of the link connection end to none (default) or arrowOpen.
Also in the Properties window, enter text for the label associated with the link in the Label property.
Alternatively, specify an EL expression to stamp out the link label based on the child node. For example, write an EL expression similar to the following where the node var attribute refers to the child node associated with the link.
```
label="{node.relationship}"
```
For more information about creating EL expressions, see Creating EL Expressions.
Optionally, also in the Properties window, use the Rendered property to stamp the link for a particular relationship between nodes. The property accepts a boolean value so you can write an EL expression that evaluates to true or false to determine if the link represents the relationship. For example, assume that you want a link to display based on reporting relationship. You write an EL expression for the link component's Rendered property similar to the following EL expression that evaluates to true when the relationship matches the value you specify (in this example, CONSULTANT):
```
rendered="#{node.relationship == "CEO"}
```

How to Disable the Hover Detail Window

By default, the hover window automatically displays when the zoom level is below 76%. If your hierarchy viewer uses popups, the hover window can interfere with the popup display. You can use the hierarchy viewer detailWindow attribute to turn off the display of the hover window.

Before you begin:

It may be helpful to have an understanding of how hierarchy viewer attributes and hierarchy viewer child tags can affect functionality. For more information, see Configuring Hierarchy Viewer Components.

You may also find it helpful to understand functionality that can be added using other ADF faces features. For more information, see Additional Functionality for Hierarchy Viewer Components.

You should already have a hierarchy viewer on your page. If you do not, follow the instructions in this chapter to create a hierarchy viewer. For information, see How to Add a Hierarchy Viewer to a Page.

To disable the hierarchy viewer hover window:

In the Structure window, right-click the dvt:hierarchyViewer node and choose Go to Properties.
In the Properties window, expand the Behavior section and select one of the following values from the DetailWindow dropdown list:
- auto
  
  This is the default value. The hover window is always enabled.
- none
  
  Select this value if you do not want to enable the hover window.

What You May Need to Know About Skinning and Customizing the Appearance of a Hierarchy Viewer

Hierarchy viewers also support skinning to customize the color and font styles for the top level components as well as the nodes, buttons, and links. In addition, you can use skinning to define the styles for a hierarchy viewer when the user hovers the mouse over or selects a navigation button.

The example below shows the skinning key for a hierarchy viewer configured to show the border color of the panel card's navigation button in black when the user selects it.

af|dvt-panelCard::navigation-button:active
  {
    -tr-border-color:#000000;
  }

For the complete list of hierarchy viewer skinning keys, see the Oracle Fusion Middleware Data Visualization Tools Tag Reference for Oracle ADF Faces Skin Selectors. For additional information about customizing your application using skins, see Customizing the Appearance Using Styles and Skins.

Adding Interactivity to a Hierarchy Viewer Component

You can configure an ADF DVT hierarchy viewer component to invoke popup windows, display menus with functionality and data from other pages in your Oracle Fusion web application, or support drag and drop functionality.

How to Configure Node Selection Action

By default, clicking a hierarchy viewer node at runtime selects the node. You can customize this interaction by setting the clickBehavior attribute on the dvt:node component.

Valid values for this property include:

focus: The node receives focus and is selected when clicked (default).
expandCollapse: Child node elements are either expanded or collapsed, depending on their current expansion state.
isolateRestore: The node is either isolated or restored, depending on its current state.
none: Clicking the node does nothing.

Before you begin:

It may be helpful to have an understanding of how hierarchy viewer attributes and hierarchy viewer child tags can affect functionality. For more information, see Configuring Hierarchy Viewer Components.

You may also find it helpful to understand functionality that can be added using other ADF faces features. For more information, see Additional Functionality for Hierarchy Viewer Components.

You should already have a hierarchy viewer on your page. If you do not, follow the instructions in this chapter to create a hierarchy viewer. For information, see How to Add a Hierarchy Viewer to a Page.

To configure node selection action:

In the structure window, right-click the dvt:node node and choose Go to Properties.
In the Properties window, expand the Behavior section and choose the value for ClickBehavior from the attribute's dropdown list.
Save changes to the JSF page.

Configuring a Hierarchy Viewer to Invoke a Popup Window

You can invoke a popup window from a hierarchy viewer node by specifying values for the af:showPopupBehavior tag and invoking it from a command component, for example, af:button. You must nest the command component that invokes the popup inside an f:facet element in a node of the hierarchy viewer component.

The triggerType property of an af:showPopupBehavior tag used in this scenario supports only the following values:

action
mouseHover

For example, Figure 31-16 shows a modal popup invoked from an HR Detail link in the node. The example below shows sample code for creating the popup.

Figure 31-16 Modal Popup in Hierarchy Viewer Node

<af:popup id="popupDialog" contentDelivery="lazyUncached" eventContext="launcher"
          launcherVar="source">
  <af:setPropertyListener from="#{source.currentRowData}"
                          to="#{myBean.selectedEmployee}" type="popupFetch"/>
  <af:dialog title="Employee HR Detail">
    <af:panelFormLayout>
      <af:panelLabelAndMessage label="Name" >
        <af:outputText value="#{myBean.selectedEmployee.firstName} #{myBean.selectedEmployee.lastName}"/>
      </af:panelLabelAndMessage>
      <af:panelLabelAndMessage label="Offical Title" >
        <af:outputText  value="#{myBean.selectedEmployee.officalTitle}"/>
      </af:panelLabelAndMessage>
      <af:panelLabelAndMessage label="HR Manager Id" >
        <af:outputText value="#{myBean.selectedEmployee.hrMgrPersonId}"/>
      </af:panelLabelAndMessage>
      <af:panelLabelAndMessage label="HR Rep Id" >
        <af:outputText value="#{myBean.selectedEmployee.hrRepPersonId}"/>
      </af:panelLabelAndMessage>
    </af:panelFormLayout>
  </af:dialog>
</af:popup>

The example below shows sample code for the invoking the popup from a hierarchy viewer component. For brevity, elements such as <af:panelGroupLayout>, <af:spacer>, and <af:separator> are not included in the sample code.

<f:facet name="zoom100">
  ...
  <dvt:panelCard effect="slideHorz"
    ...
    <af:showDetailItem text="Contact "
      ...
      <af:button text="Show HR Detail"
                 inlineStyle="font-size:14px;color:#383A47"
                 id = bu1>
        <af:showPopupBehavior popupId="::popupDialog" triggerType="action"
                              align="endAfter" alignId="bu1" />
      </af:button>
    </showDetailItem>
  </dvt:panelCard>
</f:facet>

For more information about using the af:showPopupBehavior tag, see Declaratively Invoking a Popup.

Configuring Hierarchy Viewer Drag and Drop

Hierarchy Viewers support a variety of drag and drop scenarios between components.

Hierarchy viewers support the following drag and drop scenarios:

Drag and drop one or more nodes within a hierarchy viewer
Drag one or more nodes from a hierarchy viewer to another component
Drag one or more items from another component to a hierarchy viewer

Figure 31-17 shows a hierarchy viewer configured to allow drags and drops within itself. In this example, if you click a node, you can drag it to the background to make it another root in the hierarchy or drag it to another node to add it as a child of that node.

Figure 31-17 Hierarchy Viewer Showing a Node Drag

Figure 31-18 shows the result of a drag to the hierarchy viewer background. Nancy Green and her subordinates are now shown as a new tree in the hierarchy.

Figure 31-18 Hierarchy Viewer After Node Drag to Background

If you drag the node to another node, the dragged node and its children become the child of the targeted node. Figure 31-19 shows the result of the drag to the node containing the data for Nina Evans. Nancy Green and her subordinates are now shown as subordinates to Nina Evans.

Figure 31-19 Hierarchy Viewer After Node Drag to Another Node

Figure 31-20 shows an example of the same hierarchy viewer configured to allow drops to or drags from an af:outputFormatted component. In this example, the user can drag one or more nodes to the drop text, and the text will change to indicate which node(s) the user dragged and which operation was performed. If the user drags from the drag text to a hierarchy viewer node or background, the text will change to indicate where the text was dragged and which operation was performed.

Figure 31-20 Hierarchy Viewer Configured for Drag and Drop to Another Component

Figure 31-21 shows a portion of the same hierarchy viewer after the user dragged the nodes containing the data for Nina Evans and James Marlow to the drop text.

Figure 31-21 Hierarchy Viewer After Multiple Node Drag

If the user drags from the drag text to a hierarchy viewer node or background, the text will change to indicate where the text was dragged and which operation was performed. Figure 31-22 shows a portion of the same hierarchy viewer after a user drags the text to the hierarchy viewer background.

Figure 31-22 Hierarchy Viewer After Text Drag to Hierarchy Viewer Background

How to Configure Hierarchy Viewer Drag and Drop

To add drag support to a hierarchy viewer, which will allow components or other hierarchy viewers to drag nodes from it, add the af:dragSource tag to the hierarchy viewer and add the af:dropTarget tag to the component receiving the drag. The component receiving the drag must include the org.apache.myfaces.trinidad.model.RowKeySet data flavor as a child of the af:dropTarget and also define a dropListener method to respond to the drop event.

To add drop support to a hierarchy viewer, which will allow components or other hierarchy viewers to drag items to it, add the af:dropTarget tag to the hierarchy viewer and include the data flavors that the hierarchy viewer will support. Add a dropListener method to a managed bean that will respond to the drop event.

The following procedure shows how to set up a hierarchy as a simple drag source or drop target for the af:outputFormatted component shown in Figure 31-20. For more detailed information about configuring drag and drop on ADF Faces or ADF Data Visualization components, see Adding Drag and Drop Functionality.

Before you begin:

It may be helpful to have an understanding of how hierarchy viewer attributes and hierarchy viewer child tags can affect functionality. For more information, see Configuring Hierarchy Viewer Components.

You may also find it helpful to understand functionality that can be added using other ADF Faces features. For more information, see Additional Functionality for Hierarchy Viewer Components.

You will need to complete these tasks:

Add a hierarchy viewer to your page. For more information, see How to Add a Hierarchy Viewer to a Page.

Create any additional components needed to support the drag and drop.

For example, the page in Figure 31-20 uses an af:panelGroupLayout component containing af:outputFormatted and af:panelList components to provide instructions to the user. The page also uses an af:panelSplitter component to separate the drag and drop af:outputFormatted component text from the hierarchy viewer.

The code example below shows the completed page for the additional components. The hierarchy viewer details are omitted.

<af:panelStretchLayout id="psl1" topHeight="auto" endWidth="auto">
  <f:facet name="top">
    <af:panelGroupLayout id="pgl2" layout="horizontal">
      <af:spacer width="10px" id="s8"/>
      <af:panelGroupLayout id="pgl14">
        <af:outputFormatted value="Hierarchy Viewer Drag and Drop Example"
                            id="of4" inlineStyle="font-size:small;
                            font-weight:bold;"/>
        <af:panelList id="pl1"
                      inlineStyle="font-size:x-small;">
          <af:outputFormatted value="Click and hold on a node for more than one-half second to initiate the drag. Use Ctrl+Click to select multiple nodes."
                      id="of1" inlineStyle="font-size:x-small;"/>
          <af:outputFormatted value="Drag one or more nodes from the hierarchy viewer to the drop text. The text will change to show which node(s) you dragged and the operation performed."
                     id="of2" inlineStyle="font-size:x-small;"/>
          <af:outputFormatted value="Drag the drag text to one of the hierarchy viewer nodes or background. The text will change to show where you dropped it and the operation performed."
                     id="of3" inlineStyle="font-size:x-small;"/>
        </af:panelList>
      </af:panelGroupLayout>
    </af:panelGroupLayout>
  </f:facet>
  <f:facet name="center">
    <af:panelSplitter id="ps1" orientation="horizontal" splitterPosition="125"
                      positionedFromEnd="false" styleClass="AFStretchWidth">
      <f:facet name="first">
        <af:panelSplitter id="ps2" orientation="vertical">
          <f:facet name="first">
            <af:panelGroupLayout id="pgl3" layout="vertical">
              <af:separator id="s1"/>
              <af:outputFormatted value="#{hvBean.dropText}"
                        clientComponent="true"
                        inlineStyle="font-size:small; font-weight:bold;"
                        id="of5">
              <af:dropTarget actions="COPY MOVE LINK"
                               dropListener="#{hvBean.fromDropListener}">
                <af:dataFlavor
                    flavorClass="org.apache.myfaces.trinidad.model.RowKeySet"/>
              </af:dropTarget>
            </af:outputFormatted>
            <af:spacer width="200" id="s11"/>
            <af:separator id="s3"/>
            </af:panelGroupLayout>
          </f:facet>
          <f:facet name="second">
            <af:panelGroupLayout id="pgl1">
              <af:separator id="s12"/>
              <af:outputFormatted value="#{hvBean.dragText}"
                    clientComponent="true"
                    inlineStyle="font-size:small; font-weight:bold;" id="of6">
                <af:componentDragSource/>
              </af:outputFormatted>
              <af:separator id="s10"/>
            </af:panelGroupLayout>
          </f:facet>
        </af:panelSplitter>
      </f:facet>
      <f:facet name="second">
        <dvt:hierarchyViewer id="shv" styleClass="AFStretchWidth"
                             controlPanelBehavior="initExpanded"
                             var="node" detailWindow="none"
                             value="#{XMLParser.employees}"
                             contentDelivery="immediate"
                             summary="HV Drag and Drop Sample"
                             navigateUpListener="#{XMLParser.doNavigateUp}">
          <af:dragSource actions="COPY MOVE LINK" defaultAction="MOVE"/>
          <af:dropTarget actions="COPY MOVE LINK"
                         dropListener="#{hvBean.toDropListener}">
            <af:dataFlavor flavorClass="java.lang.Object"/>
          </af:dropTarget>
          <dvt:link linkType="orthogonalRounded" id="l1"/>
          <dvt:node width="233" height="330"
                    setAnchorListener="#{XMLParser.doSetAnchor}" id="n1"
                    showNavigateUp="#{node.topNode == false}"
                    showExpandChildren="#{node.hasChildren}">
             <f:facet name="zoom100">
                 < remaining hierarchy viewer contents omitted >
        </dvt:hierarchyViewer>
      </f:facet>
    </af:panelSplitter>
  </f:facet>
</af:panelStretchLayout>

For additional information about af:outputFormatted components, see Using Output Components. For help with the af:panelGroupLayout component or other page layout components, see Organizing Content on Web Pages.

To configure hierarchy viewer drag and drop:

To configure a hierarchy viewer as a drop target, in the Components window, from the Operations panel, drag a Drop Target and drop it as a child to the hierarchy viewer.

In the Insert Drop Target dialog, enter the name of the drop listener or use the dropdown menu to choose Edit to add a drop listener method to the hierarchy viewer's managed bean. Alternatively, use the dropdown menu to choose Expression Builder and enter an EL Expression for the drop listener.

For example, to add a method named toDropListener() on a managed bean named hvBean, choose Edit, select hvBean from the dropdown menu, and click New on the right of the Method field to create the toDropListener() method.

The example below shows the sample drop listener and supporting methods for the hierarchy viewer displayed in Figure 31-20.

// imports needed by methods
import java.util.Map;
import oracle.adf.view.rich.dnd.DnDAction;
import oracle.adf.view.rich.event.DropEvent;
import oracle.adf.view.rich.datatransfer.DataFlavor;
import oracle.adf.view.rich.datatransfer.Transferable;
import org.apache.myfaces.trinidad.context.RequestContext;
import org.apache.myfaces.trinidad.render.ClientRowKeyManager;
import javax.faces.context.FacesContext;
import oracle.adf.view.faces.bi.component.hierarchyViewer.UIHierarchyViewer;
import javax.faces.component.UIComponent;
// variables need by methods
private String dragText = "Drag this text onto a node or the hierarchy viewer background";
// drop listener
public DnDAction toDropListener(DropEvent event) {
  Transferable transferable = event.getTransferable();
  DataFlavor<Object> dataFlavor = DataFlavor.getDataFlavor(Object.class);
  Object transferableObj = transferable.getData(dataFlavor);
  if(transferableObj == null)
    return DnDAction.NONE;
  // Build up the string that reports the drop information
  StringBuilder sb = new StringBuilder();
  // Start with the proposed action
  sb.append("Drag Operation: ");
  DnDAction proposedAction = event.getProposedAction();
  if(proposedAction == DnDAction.COPY) {
    sb.append("Copy<br>");
  }
  else if(proposedAction == DnDAction.LINK) {
    sb.append("Link<br>");
  }
  else if(proposedAction == DnDAction.MOVE) {
    sb.append("Move<br>");
  }
  // Then add the rowKeys of the nodes that were dragged
  UIComponent dropComponent = event.getDropComponent();
  Object dropSite = event.getDropSite();
  if(dropSite instanceof Map) {
    String clientRowKey = (String) ((Map) dropSite).get("clientRowKey");
    Object rowKey = getRowKey(dropComponent, clientRowKey);
    sb.append("Drop Site: ");
    if(rowKey != null) {
      sb.append("Node: ");
      sb.append(getLabel(dropComponent, rowKey));
    }
    else {
      sb.append("Background");
    }
  }
  // Update the output text
  this._dragText = sb.toString();
  RequestContext.getCurrentInstance().addPartialTarget(event.getDragComponent());
  return event.getProposedAction();
}
private String getLabel(UIComponent component, Object rowKey) {
  if(component instanceof UIHierarchyViewer) {
    UIHierarchyViewer hv = (UIHierarchyViewer) component;
    Employee rowData = (Employee) hv.getRowData(rowKey);
      return rowData.getFirstName() + " " + rowData.getLastName();
  }
  return null;
}
private Object getRowKey(UIComponent component, String clientRowKey) {
  if(component instanceof UIHierarchyViewer) {
    UIHierarchyViewer hv = (UIHierarchyViewer) component;
    ClientRowKeyManager crkm = hv.getClientRowKeyManager();
    return crkm.getRowKey(FacesContext.getCurrentInstance(), component, clientRowKey);
  }
  return null;
}
public String getDragText() {
  return _dragText;
}

Note:

This method references an Employee class that defines the attributes for the hierarchy viewer. If your hierarchy viewer uses a different class, substitute the name of that class instead.

If you want to look at the source code for the Employee class used in this example, you can find the source code for it and other supporting classes in the ADF Faces Components Demo application. For more information about the demo application, see ADF Faces Components Demo Application .

Click OK to enter the Insert Data Flavor dialog.
In the Insert Data Flavor dialog, enter the object that the drop target will accept. Alternatively, use the dropdown menu to navigate through the object hierarchies and choose the desired object.

For example, to allow the af:outputFormatted component to drag text to the hierarchy viewer, enter java.lang.Object in the Insert Data Flavor dialog.
In the Structure window, right-click the af:dropTarget node and choose Go to Properties.
In the Properties window, in the Actions field, enter a list of the operations that the drop target will accept, separated by spaces. Allowable values are: COPY, MOVE, or LINK. If you do not specify a value, the drop target will use COPY.

For example, enter the following in the Actions field to allow all operations:
```
COPY MOVE LINK
```
To use the hierarchy viewer as the drop target, do the following:
1. In the Components window, from the Operations panel, drag and drop a Drag Source as a child to the component that will be the source of the drag.
  
  For example, drag and drop a Drag Source as a child to an af:outputFormatted component.
2. In the Structure window, right-click the af:dragSource node and choose Go to Properties.
3. In the component's Value field, reference the public variable that you created in the drop listener for the hierarchy viewer in Step 2.
  
  For example, for a drop listener named toDropListener() and a variable named dropText, enter the following in the component's Value field:
```
#{hvBean.dropText}
```
To configure the hierarchy viewer as a drag source, in the Components window, from the Operations panel, drag and drop a Drag Source as a child to the hierarchy viewer.
In the Properties window, in the Actions field, enter a list of the operations that the drop target will accept, separated by spaces. Allowable values are: COPY, MOVE, or LINK.

For example, enter the following in the Actions field to allow all operations:
```
COPY MOVE LINK
```
To specify the default action that the drag source will support, use the DefaultAction attribute's dropdown menu to choose COPY, MOVE, or LINK.

The hierarchy viewer in the drag and drop example in Figure 31-20 uses MOVE as the default action.
To make another component the drop target for drags from the hierarchy viewer, do the following:
1. In the Components window, from the Operations panel, drag and drop a Drop Target onto the component that will receive the drop.
  
  For example, the page in the drag and drop example in Figure 31-20 contains an af:outputFormatted component that displays the results of the drop.
2. In the Insert Drop Target dialog, enter the name of the drop listener or use the dropdown menu to choose Edit to add a drop listener method to the appropriate managed bean. Alternatively, use the dropdown menu to choose Expression Builder and enter an EL Expression for the drop listener.
  
  For example, to add a method named fromDropListener() on a managed bean named hvBean, choose Edit, select hvBean from the dropdown menu, and click New on the right of the Method field to create the fromDropListener() method.
  
  The example below shows the sample drop listener for the hierarchy viewer displayed in Figure 31-20. This example uses the same imports and helper methods used in, and they are not included here.
```
// Additional import needed for listener
import org.apache.myfaces.trinidad.model.RowKeySet;
// Variables needed by method
private String dropText = "Drop a node here";
// Drop listener
public DnDAction fromDropListener(DropEvent event) {
  Transferable transferable = event.getTransferable();
  DataFlavor<RowKeySet> dataFlavor = DataFlavor.getDataFlavor(RowKeySet.class);
  RowKeySet rowKeySet = transferable.getData(dataFlavor);
  if(rowKeySet == null || rowKeySet.getSize() <= 0)
    return DnDAction.NONE;
  // Build up the string that reports the drop information
  StringBuilder sb = new StringBuilder();
  // Start with the proposed action
  sb.append("Drag Operation: ");
  DnDAction proposedAction = event.getProposedAction();
  if(proposedAction == DnDAction.COPY) {
    sb.append("Copy<br>");
  }
  else if(proposedAction == DnDAction.LINK) {
    sb.append("Link<br>");
  }
  else if(proposedAction == DnDAction.MOVE) {
    sb.append("Move<br>");
  }
  // Then add the rowKeys of the nodes that were dragged
  sb.append("Nodes: ");
  UIComponent dragComponent = event.getDragComponent();
  for(Object rowKey : rowKeySet) {
    sb.append(getLabel(dragComponent, rowKey));
    sb.append(", ");
  }
  // Remove the trailing ,
  sb.setLength(sb.length()-2);
  // Update the output text
  this.dropText = sb.toString();
  RequestContext.getCurrentInstance().addPartialTarget(event.getDropComponent());
  return event.getProposedAction();
}
```
3. Click OK to enter the Insert Data Flavor dialog.
4. In the Insert Data Flavor dialog, enter org.apache.myfaces.trinidad.model.RowKeySet.
  
  For example, to allow the af:outputFormatted component to drag text to the hierarchy viewer, enter org.apache.myfaces.trinidad.model.RowKeySet in the Insert Data Flavor dialog.
5. In the Structure window, right-click the af:dropTarget node and choose Go to Properties.
6. In the Properties window, in the Actions field, enter a list of the operations that the drop target will accept, separated by spaces. Allowable values are: COPY, MOVE, or LINK. If you do not specify a value, the drop target will use COPY.
  
  For example, enter the following in the Actions field to allow all operations:
```
COPY MOVE LINK
```
7. In the component's value field, reference the public variable that you created in the drop listener for the treemap or sunburst in Step 2.
  
  For example, for a drop listener named fromDropListener() and a variable named dragText, enter the following in the component's Value field:
```
#{hvBean.dragText}
```

What You May Need to Know About Configuring Hierarchy Viewer Drag and Drop

You can disable the ability to drag a node by setting its draggable attribute to no.

Adding Search to a Hierarchy Viewer

The ADF DVT hierarchy viewer component search functionality looks through the data structure of the hierarchy viewer and presents matches in a scrollable list. Users can double-click a search result to display the matching node as the anchor node in the hierarchy viewer. When enabled, a search panel is displayed in the upper right-hand corner of the hierarchy viewer, and results are displayed below the search panel.

Figure 31-23 shows a sample search panel.

Figure 31-23 Hierarchy Viewer Search Panel

Figure 31-24 shows sample search results.

Figure 31-24 Hierarchy Viewer Sample Search Results

How to Configure Searching in a Hierarchy Viewer

Add the dvt:search tag as a child of the dvt:hierarchyViewer tag to enable searching, and dvt:searchResults as a child of dvt:search to specify how to handle the results.

Search in a hierarchy viewer is based on the searchable attributes or columns of the data collection that is the basis of the hierarchy viewer data model. Using a query results collection defined in data controls in Oracle ADF, JDeveloper makes this a declarative task. For more information, see the "How to Create a Databound Search in a Hierarchy Viewer" section in Developing Fusion Web Applications with Oracle Application Development Framework.

Before you begin:

It may be helpful to have an understanding of how hierarchy viewer attributes and hierarchy viewer child tags can affect functionality. For more information, see Configuring Hierarchy Viewer Components.

You may also find it helpful to understand functionality that can be added using other ADF Faces features. For more information, see Additional Functionality for Hierarchy Viewer Components.

You should already have a hierarchy viewer on your page. If you do not, follow the instructions in this chapter to create a hierarchy viewer. For more information, see How to Add a Hierarchy Viewer to a Page.

To configure search in a hierarchy viewer:

In the Structure window, right-click the dvt:hierarchyViewer node and choose Insert Inside Hierarchy Viewer > Search.
In the Properties window, set the following attributes to configure the search functionality:
- Value: Specify the variable to hold the search text.
- ActionListener: Enter the listener called to perform the search.
- InitialBehavior: Specify how the search panel is initially displayed. Valid values are initCollapsed for initially collapsed, initExpanded for initially expanded, or hidden for completely hidden from view.
Optionally, to configure a component that will use the af:query component to launch an advanced search outside of the hierarchy viewer component:
1. In the Structure window, expand the dvt:search node.
2. Right-click the af:link node and choose Go to Properties.
3. In the Properties window, configure any desired properties for the af:link node.
  
  For example, to change the text that displays Advanced for the advanced search, enter a value for the Text attribute.
4. To add a popup that will display the advanced search options to the user, in the Structure window, right-click the af:link node and choose Insert Inside Link > ADF Faces > Show Popup Behavior.
5. To complete the popup configuration, add the af:popup component to your page and configure the af:query component to perform the search.
  
  For help with configuring popups, see Declaratively Invoking a Popup. For more information about the query component, see Using the query Component.
In the Structure window, right-click the dvt:search node and choose Insert Inside Search > Search Result.
In the Properties window, set the following attributes to configure the display of the search results:
- Value: Specify the search results data model. This must be an instance of oracle.adf.view.faces.bi.model.DataModel.
- Var: Enter the name of the EL variable used to reference each element of the hierarchy viewer collection. Once this component has completed rendering, this variable is removed, or reverted back, to its previous value.
- VarStatus: Enter the name of the EL variable used to reference the varStatus information. Once this component has completed rendering, this variable is removed, or reverted back, to its previous value.
- ResultListener: Specify a reference to an action listener that will be called after a row in the search results is selected.
- EmptyText: Specify the text to display when no results are returned.
- FetchSize: Specify the number of result rows to fetch at a time.
In the Structure window, right-click the dvt:searchResults node and choose Inside Search Result > Set Property Listener.
In the Properties window, set the following attributes to map the search results node from the results model to the corresponding hierarchy viewer model:
- From: Specify the source of the value, a constant or an EL expression.
- To: Specify the target of the value.
- Type: Choose action as the value.
In the Structure window, do the following to specify the components to stamp out the search results:
- To wrap the output of the search results, right-click the f:facet-content node and choose Insert Inside Facet > ADF Faces > Panel Group Layout.
- To display the search results, insert the ADF Faces output components inside the af:panelGroupLayout node to display the search results.
  
  For example, to display output text, right-click the af:panelGroupLayout node and choose Insert Inside Panel Group Layout > Output Text.
  
  The following output appears in the code after inserting and configuring two af:outputText elements:
```
<af:outputText value="#{resultRow.Lastname} " id="ot1"
               inlineStyle="color:blue;"/>
<af:outputText value="#{resultRow.Firstname}" id="ot2"/>
```
  Each stamped row references the current row using the var attribute of the dvt:searchResults tag.

The example below shows sample code for configuring search in a hierarchy viewer.

<dvt:hierarchyViewer>
  ... hierarchy viewer details omitted
  <dvt:search id="searchId" value="#{bindings.lastNameParam.inputValue}"
              actionListener="#{bindings.ExecuteWithParams1.execute}">
    <f:facet name="end">
      <af:link text="Advanced" styleClass="AFHVAdvancedSearchLinkStyle" id="l2">
        <af:showPopupBehavior popupId="::mypop" triggerType="action"/>
      </af:link>
    </f:facet>
      <dvt:searchResults id="searchResultId"
                         emptyText="#{bindings.searchResult1.viewable ? 'No match.' : 'Access Denied.'}"
                         fetchSize="25"
                         value="#{bindings.searchResult1.collectionModel}"
                         resultListener="#{bindings.ExecuteWithParams.execute}"
                         var="resultRow">
        <af:setPropertyListener from="#{resultRow.Id}"
                                to="#{bindings.employeeId.inputValue}"
                                type="action"/>
    <f:facet name="content">
      <af:panelGroupLayout layout="horizontal">
        <af:outputText value="#{resultRow.Lastname} " id="ot1"
           inlineStyle="color:blue;"/>
        <af:outputText value="#{resultRow.Firstname}" id="ot2"/>
      </af:panelGroupLayout>
    </f:facet>
      </dvt:searchResults>
  </dvt:search>
</dvt:hierarchyViewer>

What You May Need to Know About Configuring Search in a Hierarchy Viewer

The search results stamp display in the size specified in its outermost container, the af:panelGroupLayout. By default, this size is 100 x 30 pixels. If you need to adjust the size of the search results display, configure the InlineStyle attribute of the af:panelGroupLayout.

For more information, see How to Use the panelGroupLayout Component.