<af:declarativeComponent>

af:declarativeComponent declarativeComponent declarative component

UIComponent class: oracle.adf.view.rich.component.rich.fragment.RichDynamicDeclarativeComponent
Component type: oracle.adf.RichDynamicDeclarativeComponent

Naming container: Yes. When referring to children of this component ("partialTriggers", findComponent(), etc.), you must prefix the child's ID with this component's ID and a colon (':')

Defines a dynamic declarative component without a need for a specific tag. Dynamic declarative components allow the UI definition of a component to be defined in terms of a composition of other components and then treated as a single component.

You can pass attributes using JSP tag attributes, or by using <f:attribute>. Facets can also be set as normal using <f:facet> tags. The definition can refer to the attributes of the component by using the "var" EL variable and the component itself using the "componentVar" EL variable that are setup on the <af:componentDef> tag. The definition can reference a facet using the <af:facetRef> tag. Each facet can only be referenced once.

If you put a component as a child of a declarative component but fail to put it inside of a facet and fail to reference that facet in the component definition file (via facetRef), that component will not be rendered.

Dynamic declarative components support flattened chlidren. This means that children of the declarative component can be seen by the declarative component parent. So for example, input components at the root level of the declarative component will be correctly rendered if the declarative component resides in a panelFormLayout component.

Dynamic declarative components support being a partial trigger as well as a partial target. The component will trigger partial updates when any of its children broadcast an event. So for example, a value change event in an input text component that is a child of the declarative component will trigger components listening on the declarative components. By using #{attrs.partialTriggers} (assuming var is 'attrs'), child components may partially update when an action triggers the declarative component. One difference from other components is that the declarative component itself is not re-rendered. Therefore, to be able to change the viewId of the declarative component during a partial update, the parent of the declarative component must be updated.

Note about stretching layouts and flowing/scrolling layouts:

With today's web browsers, it is not reliable to have vertically-stretched content inside of areas that also have scroll bars. If you want the outer areas of your page structure to stretch, you need to be careful of how you assemble your component tree.

• First, build up a structure of stretchable components (using panelSplitters and panelStretchLayouts).
• Second, inside of this structure, create islands of non-stretched content. These islands should be rooted with panelGroupLayouts with layout="scroll". This is an ideal component because it can be stretched and does not stretch its children--which likely don't support being stretched anyway.

Rules of thumb:

1. Never place a scrolling panelGroupLayout inside of another scrolling panelGroupLayout since users do not like nested scroll bars.
2. Never specify percentage heights in any component's inlineStyle attribute.
3. Never use the "position" style in any component's inlineStyle attribute.
4. Unless you are using fixed pixel heights on them, you would never place a panelSplitter or panelStretchLayout inside of any panelGroupLayout regardless of what you have set its layout attribute to.

If you believe that you need to break one of these rules, this is an indication that your page structure is not following the page structure guidelines and you will likely have troubles getting your application to render consistently across various web browsers and computing platforms.

• For specific details of about component stretching, please see the "geometry management" section in the tag documentation of each component.
• See the demo application for real world layout examples that you can use as a starting point in your application. A good starting point is the "Layout Basics" page listed under the "Framework Features" tab of the demo application.

Example:

<af:declarativeComponent
  id="weather"
  viewid="pagefragments_weatherBox_jsff"
  zip="94065"
  description="Redwood Shores, CA">
  <f:facet name="forecastSummary">
    <af:outputText value="Partly Cloudy"/>
  </f:facet>
  <f:facet name="forecastDetail">
    <af:panelGroupLayout layout="vertical">
      <af:outputText value="72'F"/>
      <af:outputText value="Partly Cloudy"/>
      <af:outputText value="Wind: W at 16 mph"/>
      <af:outputText value="Humidity: 46%"/>
    </af:panelGroupLayout>
  </f:facet>
</af:declarativeComponent>

And this is the corresponding pagefragments/weatherBox.jsff:

<jsp:root xmlns:jsp="http://java.sun.com/JSP/Page"
          xmlns:f="http://java.sun.com/jsf/core"
          xmlns:af="http://xmlns.oracle.com/adf/faces/rich"
          version="2.1">
  <af:componentDef var="attrs">
    <af:xmlContent>
<component xmlns="http://xmlns.oracle.com/adf/faces/rich/component">
  <description>
  This component will show weather forecasts in a box.
  </description>
  <facet>
    <facet-name>forecastSummary</facet-name>
    <description>This child draws out the summary forecast</description>
  </facet>
  <facet>
    <facet-name>forecastDetail</facet-name>
    <description>This child draws out the detailed forecast</description>
  </facet>
  <attribute>
    <attribute-name>zip</attribute-name>
    <description>The Zip code of the area</description>
    <required>true</required>
  </attribute>
  <attribute>
    <attribute-name>description</attribute-name>
    <default-value>Unknown</default-value>
    <description>The city/state of the zip code </description>
  </attribute>
</component>
    </af:xmlContent>
    <af:panelHeader text="Weather Forecast for Zip:#{attrs.zip}, #{attrs.description}"
      partialTriggers="#{attrs.partialTriggers}">
      <af:facetRef facetname="forecastSummary"/>
      <af:showDetail>
        <af:facetRef facetname="forecastDetail"/>
      </af:showDetail>
    </af:panelHeader>
  </af:componentDef>        
</jsp:root>

Events

Attributes

<af:iterator var="item" value="#{bean.values}">
  <af:switcher facetname="O__item_type_">
    <f:facet name="type1">
      <af:declarativeComponent viewid="type1_jsff" />
    </f:facet>
    <f:facet name="type2">
      <af:declarativeComponent viewid="type2_jsff" />
    </f:facet>
    <f:facet name="type3">
      <af:declarativeComponent viewid="type3_jsff" />
    </f:facet>
  </af:switcher>
</af:iterator>