Class: JsonTreeDataSource

Oracle® JavaScript Extension Toolkit (JET)
7.1.0

F18183-01

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JsonTreeDataSource extends oj.TreeDataSource

Version:
  • 7.1.0
Since:
  • 1.0
Module:
  • ojjsontreedatasource

Module usage

See JET Module Loading for an overview of module usage within JET.

Javascript Import Format
define(['ojs/ojjsontreedatasource'], function(JsonTreeDataSource) {
 // Application should call API on JsonTreeDataSource 
})

Description

TreeDataSource implementation that represents hierarchical data available from an array of JSON objects. This data source can be used by ListView, NavigationList, and TreeView.

See the Tree View - Data Source: JSON demo for an example.

Refer to oj.TreeDataSource for other data sources that represent hierarchical data.
Deprecated:
Since Description
6.0.0 Use ArrayTreeDataProvider instead.

Constructor

new JsonTreeDataSource(data)

Parameters:
Name Type Description
data Object An array of JSON objects that represent the root nodes.

Each node object can contain the following properties:

attr - an object of name-value pairs that represents data for the node.

children - an array of JSON objects that represent child nodes.

Deprecated:
Since Description
6.0.0 Use ArrayTreeDataProvider instead.

Methods

fetchChildren(parentKey, range, callbacks, options) → {void}

Fetch the children
Parameters:
Name Type Argument Description
parentKey any the parent key. Specify null if fetching children from the root.
range Object information about the range, it must contain the following properties: start, count.
Properties
Name Type Description
start number the start index of the range in which the children are fetched.
count number the size of the range in which the children are fetched.
callbacks Object the callbacks to be invoke when fetch children operation is completed. The valid callback types are "success" and "error".
Properties
Name Type Argument Description
success function(JsonNodeSet) the callback to invoke when fetch completed successfully.
error function({status: *}) <optional>
the callback to invoke when fetch children failed.
options Object <optional>
optional parameters for this operation.
Properties
Name Type Argument Description
queueOnly boolean <optional>
true if this fetch request is to be queued and not execute yet. The implementation must maintain the order of the fetch operations. When queueOnly is false/null/undefined, any queued fetch operations are then flushed and executed in the order they are queued. This flag is ignored if the datasource does not support batching.
Returns:
Type
void

fetchDescendants(parentKey, callbacks, options) → {void}

Fetch all children and their children recursively from a specified parent.
Parameters:
Name Type Argument Description
parentKey any the parent key. Specify null to fetch everything from the root (i.e. expand all)
callbacks Object the callbacks to be invoke when fetch children operation is completed. The valid callback types are "success" and "error".
Properties
Name Type Argument Description
success function(JsonNodeSet) the callback to invoke when fetch completed successfully.
error function({status: *}) <optional>
the callback to invoke when fetch children failed.
options Object <optional>
optional parameters for this operation
Properties
Name Type Argument Description
start number <optional>
the index related to parent in which to begin fetching descendants from. If this is not specified, then value zero will be used
maxCount number <optional>
the maximum number of children to fetch. If a non-positive number is specified, then the value is ignored and there is no maximum fetch count
Returns:
Type
void

getCapability(feature) → {string|null}

Determines whether this TreeDataSource supports the specified feature.
Parameters:
Name Type Description
feature string the feature in which its capabilities is inquired. Currently the valid features "sort", "move", "fetchDescendants", "batchFetch"
Returns:
the name of the feature. Returns null if the feature is not recognized. For "sort", the valid return values are: "default", "none". For "fetchDescendants", the valid return values are: "enable", "disable", "suboptimal". For "move", the valid return values are: "default", "none". For "batchFetch", the valid return values are: "enable", "disable".
Type
string | null

getChildCount(parentKey) → {number}

Returns the number of children for a specified parent. If the value returned is not >= 0 then it is automatically assumed that the child count is unknown.
Parameters:
Name Type Description
parentKey any the parent key. Specify null if inquiring child count of the root.
Returns:
the number of children for the specified parent.
Type
number

getSortCriteria() → {{key: any, direction: ('ascending'|'descending'|'none')}}

Returns the current sort criteria of the tree data.
Returns:
the current sort criteria. It should contain the following properties: key, direction where criteria.key the key identifying the attribute (column) to sort on. Value is null if it's not sorted. criteria.direction the sort direction, valid values are "ascending", "descending", "none" (default)
Type
{key: any, direction: ('ascending'|'descending'|'none')}

handleEvent(eventType, event) → {boolean}

Handle the event
Parameters:
Name Type Description
eventType string event type
event Object event
Inherited From:
Returns:
Returns false if event is cancelled
Type
boolean

Init() → {undefined}

Initial the json object based data source.
Returns:
Type
undefined

move(nodeToMove, referenceNode, position, callbacks) → {void}

Moves a node from one location to another (different position within the same parent or a completely different parent)
Parameters:
Name Type Description
nodeToMove any the key of the node to move
referenceNode any the key of the reference node which combined with position are used to determine the destination of where the node should moved to.
position number | string The position of the moved node relative to the reference node. This can be a string: "before", "after", "inside", "first", "last", or the zero based index to position the element at a specific point among the reference node's current children.
callbacks Object the callbacks for the move function
Properties
Name Type Argument Description
success function():void the callback to invoke when the move completed successfully.
error function({status: *}) <optional>
the callback to invoke when move failed.
Returns:
Type
void

moveOK(rowToMove, referenceRow, position) → {('valid'|'invalid')}

Checks whether a move operation is valid.
Parameters:
Name Type Description
rowToMove any the key of the row to move
referenceRow any the key of the reference row which combined with position are used to determine the destination of where the row should moved to.
position number | string The position of the moved row relative to the reference row. This can be a string: "before", "after", "inside", "first", "last", or the zero based index to position the element at a specific point among the reference row's current children.
Returns:
returns "valid" if the move is valid, "invalid" otherwise.
Type
('valid'|'invalid')

off(eventType, eventHandler) → {void}

Detach an event handler.

Application can call this if it no longer wants to be notified of an event that it has attached an handler to using the on method.

Parameters:
Name Type Description
eventType string eventType
eventHandler function(Object) event handler function
Inherited From:
Returns:
Type
void

on(eventType, eventHandler) → {void}

Attach an event handler.

Application can call this if it wants to be notified of an event. It can call the off method to detach the handler when it no longer wants to be notified.

Parameters:
Name Type Description
eventType string eventType
eventHandler function(Object) event handler function
Inherited From:
Returns:
Type
void

sort(criteria, callbacks) → {void}

Performs a sort operation on the tree data.
Parameters:
Name Type Description
criteria Object the sort criteria. It must contain the following properties: key, direction
Properties
Name Type Description
key any the key identifying the attribute (column) to sort on
direction 'ascending' | 'descending' | 'none' the sort direction, valid values are "ascending", "descending", "none" (default)
callbacks Object the callbacks for the move function
Properties
Name Type Argument Description
success function():void the callback to invoke when the sort completed successfully.
error function({status: *}) <optional>
the callback to invoke when sort failed.
Returns:
Type
void