CustomStore

The CustomStore enables you to implement custom data access logic for consuming data from any source.

Included in: dx.mobile.js, dx.web.js, dx.viz.js, dx.viz-web.js, dx.all.js
Export: default
Type:

Object

DevExtreme provides extensions for ASP.NET and PHP that configure the CustomStore and implement server-side data processing. A third-party extension is available for MongoDB. You can also implement the CustomStore manually.

The CustomStore's implementation depends on whether data is processed on the client or server. For client-side data processing, implement the load function to load data from the data source. Refer to the Load Data in the Raw Mode article for more information.

For server-side data processing, implement the load function to send data processing parameters to the server. The server should send back processed data. load and CustomStore have specifics that depend on the widget that uses the CustomStore. Refer to the load description for more information.

If your data source supports CRUD operations, implement the insert, update, and remove functions.

jQuery
JavaScript
var store = new DevExpress.data.CustomStore({
    key: "id",
    load: function (loadOptions) {
        // ...
    },
    insert: function (values) {
        // ...
    },
    update: function (key, values) {
        // ...
    },
    remove: function (key) {
        // ...
    }
});

// ===== or inside the DataSource =====
var dataSource = new DevExpress.data.DataSource({
    // ...
    // a mix of CustomStore and DataSource options
    // ...
});
Angular
TypeScript
import CustomStore from "devextreme/data/custom_store";
import DataSource from "devextreme/data/data_source";
// ...
export class AppComponent {
    store: CustomStore;
    dataSource: DataSource;
    constructor () {
        this.store = new CustomStore({
            key: "id",
            load: (loadOptions) => {
                // ...
            },
            insert: (values) => {
                // ...
            },
            update: (key, values) => {
                // ...
            },
            remove: (key) => {
                // ...
            }
        });

        // ===== or inside the DataSource =====
        this.dataSource = new DataSource({
           // ...
            // a mix of CustomStore and DataSource options
            // ...
        });
    }
}
AngularJS
JavaScript
angular.module('DemoApp', ['dx'])
    .controller('DemoController', function DemoController($scope) {
        $scope.store = new DevExpress.data.CustomStore({
            key: "id",
            load: function (loadOptions) {
                // ...
            },
            insert: function (values) {
                // ...
            },
            update: function (key, values) {
                // ...
            },
            remove: function (key) {
                // ...
            }
        });

        // ===== or inside the DataSource =====
        $scope.dataSource = new DevExpress.data.DataSource({
            // ...
            // a mix of CustomStore and DataSource options
            // ...
        });
    });
Knockout
JavaScript
var viewModel = {
    store: new DevExpress.data.CustomStore({
        key: "id",
        load: function (loadOptions) {
            // ...
        },
        insert: function (values) {
            // ...
        },
        update: function (key, values) {
            // ...
        },
        remove: function (key) {
            // ...
        }
    })

    // ===== or inside the DataSource =====
    dataSource: new DevExpress.data.DataSource({
        // ...
        // a mix of CustomStore and DataSource options
        // ...
    })
};

ko.applyBindings(viewModel);
See Also

Configuration

This section describes options that configure the CustomStore.

Name Description
byKey

Specifies a custom implementation of the byKey(key) method.

cacheRawData

Specifies whether raw data should be saved in the cache. Applies only if loadMode is "raw".

errorHandler

Specifies the function that is executed when the store throws an error.

insert

Specifies a custom implementation of the insert(values) method.

key

Specifies the key property (or properties) used to access data items.

load

Specifies a custom implementation of the load(options) method.

loadMode

Specifies how data returned by the load function is treated.

onInserted

A function that is executed after a data item is added to the store.

onInserting

A function that is executed before a data item is added to the store.

onLoaded

A function that is executed after data is loaded to the store.

onLoading

A function that is executed before data is loaded to the store.

onModified

A function that is executed after a data item is added, updated, or removed from the store.

onModifying

A function that is executed before a data item is added, updated, or removed from the store.

onPush

The function executed before changes are pushed to the store.

onRemoved

A function that is executed after a data item is removed from the store.

onRemoving

A function that is executed before a data item is removed from the store.

onUpdated

A function that is executed after a data item is updated in the store.

onUpdating

A function that is executed before a data item is updated in the store.

remove

Specifies a custom implementation of the remove(key) method.

totalCount

Specifies a custom implementation of the totalCount(options) method.

update

Specifies a custom implementation of the update(key, values) method.

useDefaultSearch

Specifies whether the store combines the search and filter expressions. Defaults to true if the loadMode is "raw" and false if it is "processed".

Methods

This section describes the methods used to access data associated with the CustomStore.

Name Description
byKey(key)

Gets a data item with a specific key.

clearRawDataCache()

Deletes data from the cache. Takes effect only if the cacheRawData option is true.

insert(values)

Adds a data item to the store.

key()

Gets the key property (or properties) as specified in the key option.

keyOf(obj)

Gets a data item's key value.

load()

Starts loading data.

load(options)

Starts loading data.

off(eventName)

Detaches all event handlers from a single event.

off(eventName, eventHandler)

Detaches a particular event handler from a single event.

on(eventName, eventHandler)

Subscribes to an event.

on(events)

Subscribes to events.

push(changes)

Pushes data changes to the store and notifies the DataSource.

remove(key)

Removes a data item with a specific key from the store.

totalCount(options)

Gets the total count of items the load() function returns.

update(key, values)

Updates a data item with a specific key.

Events

This section describes events that the CustomStore raises.

Name Description
inserted

Raised after a data item is added to the store.

inserting

Raised before a data item is added to the store.

loaded

Raised after data is loaded to the store.

loading

Raised before data is loaded to the store.

modified

Raised after a data item is added, updated, or removed from the store.

modifying

Raised before a data item is added, updated, or removed from the store.

push

Raised before changes are pushed to the store.

removed

Raised after a data item is removed from the store.

removing

Raised before a data item is removed from the store.

updated

Raised after a data item is updated in the store.

updating

Raised before a data item is updated in the store.

LoadOptions

This section describes the loadOptions object's fields.

Type:

Object

This object is used to specify settings according to which the server should process data. More often these settings are passed as a parameter to the load function and depend on the operations (paging, filtering, sorting, etc.) that you have enabled in the DataSource or widget.

See Also