Final Class: CollectionDataProvider

Oracle® JavaScript Extension Toolkit (JET)
8.0.0
F18189-01

Signature:

final class CollectionDataProvider<K, D> implements DataProvider<K, D>

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Methods


CollectionDataProvider

Version:
  • 8.0.0
Since:
  • 6.0.0
Module:
  • ojcollectiondataprovider

Module usage

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

Javascript Import Format
define(['ojs/ojcollectiondataprovider'], function(CollectionDataProvider) {
 // Application should call API on CollectionDataProvider 
})
Typescript Import Format
//This class is exported directly as module. To import it
import CollectionDataProvider= require("ojs/ojcollectiondataprovider");

Generic Parameters
ParameterDescription
KType of Key
DType of Data

JET In Typescript

A detailed description of working with JET elements and classes in your typescript project can be found at: JET Typescript Usage.

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.

Description

This class implements oj.DataProvider. This object represents a data provider that is created from an oj.Collection object, such as an external data source. It can be used by ListView, NavigationList, TabBar, and Table.

Constructor

new CollectionDataProvider(collection)

Parameters:
Name Type Description
collection oj.Collection data supported by the components

Methods

addEventListener(eventType: string, listener: EventListener): void

Add a callback function to listen for a specific event type.
Parameters:
Name Type Description
eventType string The event type to listen for.
listener EventListener The callback function that receives the event notification.

containsKeys(params: FetchByKeysParameters<K>): Promise<ContainsKeysResults<K>>

Check if there are rows containing the specified keys
Parameters:
Name Type Description
params oj.FetchByKeysParameters Fetch by keys parameters
Returns:
Promise which resolves to oj.ContainsKeysResults
Type
Promise.<oj.ContainsKeysResults>

dispatchEvent(evt: Event): boolean

Dispatch an event and invoke any registered listeners.
Parameters:
Name Type Description
event Event The event object to dispatch.
Returns:
Return false if a registered listener has cancelled the event. Return true otherwise.
Type
boolean

fetchByKeys(params: FetchByKeysParameters<K>): Promise<FetchByKeysResults<K, D>>

Fetch rows by keys
Parameters:
Name Type Description
params oj.FetchByKeysParameters Fetch by keys parameters
Returns:
Promise which resolves to oj.FetchByKeysResults
Type
Promise.<oj.FetchByKeysResults>

fetchByOffset(params: FetchByOffsetParameters<D>): Promise<FetchByOffsetResults<K, D>>

Fetch rows by offset
Parameters:
Name Type Description
params oj.FetchByOffsetParameters Fetch by offset parameters
Returns:
Promise which resolves to oj.FetchByOffsetResults
Type
Promise.<oj.FetchByOffsetResults>

fetchFirst(params?: FetchListParameters<D>): AsyncIterable<FetchListResult<K, D>>

Fetch the first block of data.
Parameters:
Name Type Argument Description
params oj.FetchListParameters <optional>
 Fetch parameters
See:
Returns:
AsyncIterable with oj.FetchListResult
Type
AsyncIterable.<oj.FetchListResult>

getCapability(capabilityName?: string): any

Determines whether this DataProvider supports certain feature.
Parameters:
Name Type Description
capabilityName string capability name. Supported capability names are: "fetchByKeys", "fetchByOffset", and "sort".
Returns:
capability information or null if unsupported
Type
Object

getTotalSize() : {Promise.<number>}

Return the total number of rows in this dataprovider
Returns:
Returns a Promise which resolves to the total number of rows. -1 is unknown row count.
Type
Promise.<number>

isEmpty() : {"yes"|"no"|"unknown"}

Return a string that indicates if this data provider is empty
Returns:
a string that indicates if this data provider is empty. Valid values are: "yes": this data provider is empty. "no": this data provider is not empty. "unknown": it is not known if this data provider is empty until a fetch is made.
Type
"yes" | "no" | "unknown"

removeEventListener(eventType: string, listener: EventListener): void

Remove a listener previously registered with addEventListener.
Parameters:
Name Type Description
eventType string The event type that the listener was registered for.
listener EventListener The callback function that was registered.