Final Class: CollectionTableDataSource

Usage

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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.

Constructor

new CollectionTableDataSource(data, options)

Parameters:

Name Type Argument Description

data Collection data supported by the components

options

Object | null

Options for the TableDataSource

Properties

Name	Type	Argument	Description
`startFetch`	"enabled" \| "disabled"	<optional>	Control whether to start initial fetch when the TableDataSource is bound to a component. Valid values are: "enabled" (default) - Start initial fetch automatically when the TableDataSource is bound to a component. "disabled" - Do not start initial fetch automatically. Application will call the fetch() method to start the first fetch.

Fields

comparator

If set to a function(row1, row2), then this function is called comparing raw row data (see the JavaScript array.sort() for details)

sortCriteria :Object

The sort criteria. Whenever sort() is called with the criteria parameter, that value is copied to this property. If sort() is called with empty sort criteria then the criteria set in this property is used.

Properties:

Name	Type	Description
`criteria.direction`	'ascending' \| 'descending' \| 'none'	the sort direction, valid values are "ascending", "descending", "none" (default)
`criteria.key`	any	The key that identifies which field to sort

Inherited From:

TableDataSource#sortCriteria

Methods

at(index, options) : {Promise.<(null|TableDataSource.RowData)>}

Return the row data found at the given index.

Parameters:

Name	Type	Argument	Description
`index`	number		Index for which to return the row data.
`options`	Object	<optional>	Options to control the at.

Returns:

Promise resolves to a compound object which has the structure below. If the index is out of range, Promise resolves to null.

data	The raw row data
index	The index for the row
key	The key value for the row

Type: Promise.<(null|TableDataSource.RowData)>

fetch(options) : {Promise.<(null|TableDataSource.RowDatas)>}

Fetch the row data.

Parameters:

Name Type Argument Description

options

Object

Options to control fetch

Properties

Name	Type	Argument	Description
`startIndex`	number	<optional>	The index at which to start fetching records.
`silent`	boolean	<optional>	If set, do not fire a sync event.

Returns:

Promise object resolves to a compound object which contains an array of row data objects, an array of ids, and the startIndex triggering done when complete.

The structure of the resolved compound object is:

data	An array of raw row data
keys	An array of key values for the rows
startIndex	The startIndex for the returned set of rows

Type: Promise.<(null|TableDataSource.RowDatas)>

get(id, options) : {Promise.<(null|TableDataSource.RowData)>}

Return the first row data whose id value is the given id

Parameters:

Name	Type	Argument	Description
`id`	string		ID for which to return the row data, if found.
`options`	Object	<optional>	Options to control the get.

Returns:

Promise which resolves to a compound object which has the structure below where the id matches the given id. If none are found, resolves to null.

data	The raw row data
index	The index for the row
key	The key value for the row

Type: Promise.<(null|TableDataSource.RowData)>

getCapability(feature) : {string|null}

Determines whether this TableDataSource 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". Returns null if the feature is not recognized.

Type: string | null

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

Init : {undefined}

Initializes the instance.

Inherited From:

DataSource#Init

Returns:

Type: undefined

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

sort(criteria) : {Promise.<null>}

Performs a sort on the data source.

Parameters:

Name Type Argument Description

criteria

Object

the sort criteria.

Properties

Name	Type	Description
`key`	any	The key that identifies which field to sort
`direction`	'ascending' \| 'descending' \| 'none'	the sort direction, valid values are "ascending", "descending", "none" (default)

Returns:

promise object triggering done when complete.

Type: Promise.<null>

totalSize : {number}

Return the total size of data available, including server side if not local.

Returns:

total size of data

Type: number

totalSizeConfidence : {('actual'|'estimate'|'atLeast'|'unknown')}

Returns the confidence for the totalSize value.

Returns:

"actual" if the totalSize is the time of the fetch is an exact number "estimate" if the totalSize is an estimate "atLeast" if the totalSize is at least a certain number "unknown" if the totalSize is unknown

Type: ('actual'|'estimate'|'atLeast'|'unknown')