Final Class: CubeDataGridDataSource

Usage

For additional information visit:

Final classes in JET

Classes in JET are generally final and do not support subclassing. At the moment, final is not enforced. However, this will likely change in an upcoming JET release.

See:

Cube

Constructor

new CubeDataGridDataSource(cube)

Parameters:

Name	Type	Description
`cube`	Cube	the cube that will underpin the data source

See:

Cube

Methods

fetchCells(cellRange, callbacks, callbackObjects) : {void}

Parameters:

Name	Type	Argument	Description
`cellRange`	Array.<Object>		Information about the cell range. A cell range is defined by an array of range info for each axis, where each range contains three properties: axis, start, count. axis: the axis associated with this range where cells are fetched. Valid values are "row" and "column". start: the start index of the range for this axis in which the cells are fetched. count: count the size of the range for this axis in which the cells are fetched.
`callbacks`	Object		the callbacks to be invoke when fetch cells operation is completed. The valid callback types are "success" and "error"
`callbackObjects`	Object	<optional>	the object in which the callback function is invoked on. This is optional. You can specify the callback object for each callbacks using the "success" and "error" keys.

Properties:

Name	Type	Argument	Description
`callbackObjects.error`	Object	<optional>
`callbackObjects.success`	Object	<optional>
`callbacks.error`	function({status: Object}):void		the callback to invoke when fetch cells failed.
`callbacks.success`	function({cellSet: Object}, {cellRange: Object}):void		the callback to invoke when fetch cells completed successfully. The passed arguments are CellSet and the cellRange

Returns:

Type: void

fetchHeaders(headerRange, callbacks, callbackObjects) : {void}

Fetch a range of headers from the data source.

Parameters:

Name	Type	Argument	Description
`headerRange`	Object		information about the header range, it must contain the following properties: axis, start, count
`callbacks`	Object		the optional callbacks to be invoke when fetch headers operation is completed. The valid callback types are "success" and "error"
`callbackObjects`	Object	<optional>	the object in which the callback function is invoked on. This is optional. You can specify the callback object for each callbacks using the "success" and "error" keys.

Properties:

Name	Type	Argument	Description
`callbackObjects.error`	Object	<optional>
`callbackObjects.success`	Object	<optional>
`callbacks.error`	function({status: Object}):void		the callback to invoke when fetch cells failed.
`callbacks.success`	function({startHeaderSet: Object}, {headerRange: Object}, {endHeaderSet: Object}):void		the callback to invoke when fetch headers completed successfully. The function takes three parameters: HeaderSet object representing start headers, headerRange object passed into the original fetchHeaders call, and a HeaderSet object representing the end headers along the axis.
`headerRange.axis`	string		the axis of the header that are fetched. Valid values are "row" and "column"
`headerRange.count`	number		the size of the range in which the header data are fetched
`headerRange.start`	number		the start index of the range in which the header data are fetched

Returns:

Type: void

getCapability(feature) : {string|null}

Determines whether this DataGridDataSource supports certain feature.

Parameters:

Name	Type	Description
`feature`	string	the feature in which its capabilities is inquired. Currently the only valid feature is "sort".

Returns:

the name of the feature. For "sort", the valid return values are: "full", "none", "row", "column". For "move", the valid return values are: "row", "none". Returns null if the feature is not recognized.

Type: string | null

getCount(axis) : {number}

Returns the total number of rows or columns. If the value return is not >= 0 then it is automatically assumed that the total count is unknown.

Parameters:

Name	Type	Description
`axis`	string	the axis in which we inquire for the total count. Valid values are "row" and "column".

Returns:

the total number of rows/columns.

Type: number

getCountPrecision(axis) : {string}

Returns whether the total count returned in getCount function is an actual or an estimate.

Parameters:

Name	Type	Description
`axis`	string	the axis in which we inquire whether the total count is an estimate. Valid values are "row" and "column".

Returns:

"exact" if the count returned in getCount function is the actual count, "estimate" if the count returned in getCount function is an estimate. The default value is "exact".

Type: string

handleEvent(eventType, event) : {boolean}

Handle the event

Parameters:

Name	Type	Description
`eventType`	string	event type
`event`	Object	event

Inherited From:

EventSource#handleEvent

Returns:

Returns false if event is cancelled

Type: boolean

indexes(indexes) : {Promise.<Object>}

Returns the keys based on the indexes.

Parameters:

Name	Type	Description
`indexes`	Object	the index for each axis

Properties:

Name	Type	Description
`indexes.column`	number	the index for the column axis
`indexes.row`	number	the index for the row axis

Returns:

a Promise object which when resolved returns an object containing the index for each axis

Type: Promise.<Object>

Init : {undefined}

Initializes the instance.

Inherited From:

DataSource#Init

Returns:

Type: undefined

keys(keys) : {Promise.<Object>}

Returns the row and column index based on the keys.

Parameters:

Name	Type	Description
`keys`	Object	the key for each axis

Properties:

Name	Type	Description
`keys.column`	number	the key for the column axis
`keys.row`	number	the key for the row axis

Returns:

a Promise object which when resolved returns an object containing the key for each axis

Type: Promise.<Object>

moveOK(rowToMove, referenceRow, position) : {string}

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`	string	The position of the moved row relative to the reference row. Valid values are: "before", "after".

Returns:

returns "valid" if the move is valid, "invalid" otherwise.

Type: string

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:

EventSource#off

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:

EventSource#on

Returns:

Type: void

setCube(cube) : {undefined}

Set a new cube on the data source

Parameters:

Name	Type	Description
`cube`	Cube

Returns:

Type: undefined

setPage(indices) : {undefined}

Pin any axes beyond the row and column to specific index values (to allow the idea of "paging" through a cube)

Parameters:

Name	Type	Description
`indices`	Array.<CubeDataGridDataSource.Indices>	an array of objects each containing an 'axis' attribute and a zero-based 'index' attribute giving the index to "pin" the axis to.

Returns:

Type: undefined

Type Definitions

Indices

Object in setPage indices parameter

Properties:

Name	Type
`axis`	number
`index`	number