This section describes properties that configure the DataSource.
NOTE
The DataSource allows you to specify CustomStore properties in its configuration object. If you define CustomStore properties as shown in the following code, they override the store.
jQuery
JavaScript
var infiniteList = new DevExpress.data.DataSource({ load: function (loadOptions) { // Loading data objects }, byKey: function (key) { // Retrieving a data object by key }});Angular
TypeScript
import DataSource from "devextreme/data/data_source";// ...export class AppComponent { infiniteList: DataSource; constructor() { this.infiniteList = new DataSource({ load: (loadOptions) => { return new Promise((resolve, reject) => { const data = // Loading data objects resolve(data); }); }, byKey: (key) => { return new Promise((resolve, reject) => { const obj = // Retrieving a data object by key resolve(obj); }); } }); }}Vue
App.vue
<script>import DataSource from 'devextreme/data/data_source';const infiniteList = new DataSource({ load: (loadOptions) => { // Loading data objects }, byKey: (key) => { // Retrieving a data object by key }});export default { // ... data() { return { infiniteList } }}</script>React
App.js
// ...import DataSource from 'devextreme/data/data_source';const infiniteList = new DataSource({ load: (loadOptions) => { // Loading data objects }, byKey: (key) => { // Retrieving a data object by key }});class App extends React.Component { // ...}export default App;customQueryParams
Custom parameters that should be passed to an OData service with the load query. Available only for the ODataStore.
Type: any
jQuery
JavaScript
var ds = new DevExpress.data.DataSource({ store: { type: "odata", // ODataStore is configured here }, customQueryParams: { param: "value" }});Angular
TypeScript
import DataSource from "devextreme/data/data_source";import ODataStore from "devextreme/data/odata/store";// ...export class AppComponent { ds: DataSource; constructor() { this.ds = new DataSource({ store: new ODataStore({ // ODataStore is configured here }), customQueryParams: { param: "value" } }); }}Vue
App.vue
<script>import DataSource from 'devextreme/data/data_source';import ODataStore from 'devextreme/data/odata/store';const ds = new DataSource({ store: new ODataStore({ // ODataStore is configured here }), customQueryParams: { param: 'value' }});export default { // ... data() { return { ds } }}</script>React
App.js
// ...import DataSource from 'devextreme/data/data_source';import ODataStore from 'devextreme/data/odata/store';const ds = new DataSource({ store: new ODataStore({ // ODataStore is configured here }), customQueryParams: { param: 'value' }});class App extends React.Component { // ...}export default App;See Also
- OData - Invoking Service Operations
expand
Specifies the navigation properties to be loaded with the OData entity. Available only for the ODataStore.
jQuery
JavaScript
var ds = new DevExpress.data.DataSource({ store: { type: "odata", // ODataStore is configured here }, expand: ["PropertyName1", "PropertyName2"]});Angular
TypeScript
import DataSource from "devextreme/data/data_source";import ODataStore from "devextreme/data/odata/store";// ...export class AppComponent { ds: DataSource; constructor() { this.ds = new DataSource({ store: new ODataStore({ // ODataStore is configured here }), expand: ["PropertyName1", "PropertyName2"] }); }}Vue
App.vue
<script>import DataSource from 'devextreme/data/data_source';import ODataStore from 'devextreme/data/odata/store';const ds = new DataSource({ store: new ODataStore({ // ODataStore is configured here }), expand: ['PropertyName1', 'PropertyName2']});export default { // ... data() { return { ds } }}</script>React
App.js
// ...import DataSource from 'devextreme/data/data_source';import ODataStore from 'devextreme/data/odata/store';const ds = new DataSource({ store: new ODataStore({ // ODataStore is configured here }), expand: ['PropertyName1', 'PropertyName2']});class App extends React.Component { // ...}export default App;ASP.NET MVC Controls
Razor C#
Razor VB
@(Html.DevExtreme().WidgetName() .DataSource(ds => ds.OData() .Expand("PropertyName1", "PropertyName2") ))@(Html.DevExtreme().WidgetName() _ .DataSource(Function(ds) Return ds.OData() _ .Expand("PropertyName1", "PropertyName2") End Function))See Also
- OData - Associations
filter
Specifies data filtering conditions.
Type:
Filter Expression
Possible variants:
Binary filter
Supported operators: "=", "<>", ">", ">=", "<", "<=", "startswith", "endswith", "contains", "notcontains".
Example:[ "dataField", "=", 3 ]
Unary filter
Supported operators: binary operators, "!".
Example:[ "!", [ "dataField", "=", 3 ] ]
Complex filter
Supported operators: binary and unary operators, "and", "or".
Example:[ [ "dataField", "=", 10 ], "and", [ [ "anotherDataField", "<", 3 ], "or", [ "anotherDataField", ">", 11 ] ]]
jQuery
JavaScript
var ds = new DevExpress.data.DataSource({ // ... filter: [ "count", "<", "10" ]});Angular
TypeScript
import DataSource from "devextreme/data/data_source";// ...export class AppComponent { ds: DataSource; constructor() { this.ds = new DataSource({ // ... filter: [ "count", "<", "10" ] }); }}Vue
App.vue
<script>import DataSource from 'devextreme/data/data_source';const ds = new DataSource({ // ... filter: [ 'count', '<', '10' ]});export default { // ... data() { return { ds } }}</script>React
App.js
// ...import DataSource from 'devextreme/data/data_source';const ds = new DataSource({ // ... filter: [ 'count', '<', '10' ]});class App extends React.Component { // ...}export default App;ASP.NET MVC Controls
Razor C#
@(Html.DevExtreme().WidgetName() .DataSourceOptions(dso => dso .Filter("[ 'count', '<', '10' ]") ))NOTE
Filtering works when inputting a plain data structure only. However, if you need the filtering capability and hierarchical data, transform the plain data using the DataSource's group property.
See Also
- Filtering
group
Specifies data grouping properties.
Type:
Group Expression
This property accepts one of the following:
String
The field name to group by.Object
An object with the following fields:- selector: String
The field name to group by. - desc: Boolean
Sorts the selector field in descending order.
- selector: String
Array
An array of strings and objects described above.Function
A function that returns the value to group by.
jQuery
JavaScript
var ds = new DevExpress.data.DataSource({ // ... group: { selector: "LastName", desc: true }, /* or as a function group: function(e) { // creates two custom groups return e.BirthYear < 1990 ? "Born before 1990" : "Born after 1990"; } */});Angular
TypeScript
import DataSource from "devextreme/data/data_source";// ...export class AppComponent { ds: DataSource; constructor() { this.ds = new DataSource({ // ... group: { selector: "LastName", desc: true }, /* or as a function group: function(e) { // creates two custom groups return e.BirthYear < 1990 ? "Born before 1990" : "Born after 1990"; } */ }); }}Vue
App.vue
<script>import DataSource from 'devextreme/data/data_source';const ds = new DataSource({ // ... group: { selector: 'LastName', desc: true }, /* or as a function group: function(e) { // creates two custom groups return e.BirthYear < 1990 ? 'Born before 1990' : 'Born after 1990'; } */});export default { // ... data() { return { ds } }}</script>React
App.js
// ...import DataSource from 'devextreme/data/data_source';const ds = new DataSource({ // ... group: { selector: 'LastName', desc: true }, /* or as a function group: function(e) { // creates two custom groups return e.BirthYear < 1990 ? 'Born before 1990' : 'Born after 1990'; } */});class App extends React.Component { // ...}export default App;ASP.NET MVC Controls
Razor C#
@(Html.DevExtreme().WidgetName() .DataSourceOptions(dso => dso .Group("LastName", true) // === or as a function === .Group("group_function") ))<script type="text/javascript"> function group_function(e) { // creates two custom groups return e.BirthYear < 1990 ? "Born before 1990" : "Born after 1990"; }</script>See Also
- Grouping
langParams
Specifies parameters for language-specific sorting and filtering.
Type:
LangParams
Use this property to include language-specific parameters in sorting and filtering operations performed on a client. For example, you can use langParams to make DataSource ignore letters with diacritic symbols. Specify locale and collator options as in the example below:
jQuery
JavaScript
const dataSource = new DevExpress.data.DataSource({ // ... langParams: { locale: 'fr', collatorOptions: { sensitivity: 'accent', caseFirst: 'upper' } }});Angular
TypeScript
import DataSource from "devextreme/data/data_source";// ...export class AppComponent { dataSource: DataSource; constructor () { this.dataSource = new DataSource({ // ... langParams: { locale: 'fr', collatorOptions: { sensitivity: 'accent', caseFirst: 'upper' } } }); }}Vue
App.vue
<script>import DataSource from 'devextreme/data/data_source';const dataSource = new DataSource({ // ... langParams: { locale: 'fr', collatorOptions: { sensitivity: 'accent', caseFirst: 'upper' } }});export default { data() { return { dataSource } }}</script>React
App.js
// ...import DataSource from 'devextreme/data/data_source';const dataSource = new DataSource({ // ... langParams: { locale: 'fr', collatorOptions: { sensitivity: 'accent', caseFirst: 'upper' } }});function App() { // ...}export default App;map
Specifies an item mapping function.
Type:
Function parameters:
dataItem:
An initial data item.
Return Value:
A modified data item.
jQuery
JavaScript
var ds = new DevExpress.data.DataSource({ store: { data: [{ firstName: "John", lastName: "Smith" }] }, map: function (dataItem) { return { fullName: dataItem.firstName + " " + dataItem.lastName } }});Angular
TypeScript
import DataSource from "devextreme/data/data_source";import ArrayStore from "devextreme/data/array_store";// ...export class AppComponent { ds: DataSource; constructor() { this.ds = new DataSource({ store: new ArrayStore({ data: [{ firstName: "John", lastName: "Smith" }] }), map: (dataItem) => { return { fullName: dataItem.firstName + " " + dataItem.lastName } } }); }}Vue
App.vue
<script>import DataSource from 'devextreme/data/data_source';import ArrayStore from 'devextreme/data/array_store';const ds = new DataSource({ store: new ArrayStore({ data: [{ firstName: 'John', lastName: 'Smith' }] }), map: (dataItem) => { return { fullName: dataItem.firstName + ' ' + dataItem.lastName } }});export default { // ... data() { return { ds } }}</script>React
App.js
// ...import DataSource from 'devextreme/data/data_source';import ArrayStore from 'devextreme/data/array_store';const ds = new DataSource({ store: new ArrayStore({ data: [{ firstName: 'John', lastName: 'Smith' }] }), map: (dataItem) => { return { fullName: dataItem.firstName + ' ' + dataItem.lastName } }});class App extends React.Component { // ...}export default App;ASP.NET MVC Controls
Razor C#
@(Html.DevExtreme().WidgetName() .DataSource(new [] { new { firstName = "John", lastName = "Smith" } }) .DataSourceOptions(dso => dso .Map("dataSource_map") ))<script type="text/javascript"> function dataSource_map (dataItem) { return { fullName: dataItem.firstName + " " + dataItem.lastName } }</script>See Also
- Item Mapping
onChanged
A function that is executed after data is loaded.
Type:
jQuery
JavaScript
var ds = new DevExpress.data.DataSource({ onChanged: function () { // Your code goes here }});Angular
TypeScript
import DataSource from "devextreme/data/data_source";// ...export class AppComponent { ds: DataSource; constructor() { this.ds = new DataSource({ onChanged: () => { // Your code goes here } }); }}Vue
App.vue
<script>import DataSource from 'devextreme/data/data_source';const ds = new DataSource({ // ... onChanged: () => { // Your code goes here }});export default { // ... data() { return { ds } }}</script>React
App.js
// ...import DataSource from 'devextreme/data/data_source';const ds = new DataSource({ // ... onChanged: () => { // Your code goes here }});class App extends React.Component { // ...}export default App;onLoadError
A function that is executed when data loading fails.
Type:
jQuery
JavaScript
var ds = new DevExpress.data.DataSource({ onLoadError: function (error) { console.log(error.message); }});Angular
TypeScript
import DataSource from "devextreme/data/data_source";// ...export class AppComponent { ds: DataSource; constructor() { this.ds = new DataSource({ onLoadError: (error) => { console.log(error.message); } }); }}Vue
App.vue
<script>import DataSource from 'devextreme/data/data_source';const ds = new DataSource({ // ... onLoadError: (error) => { console.log(error.message); }});export default { // ... data() { return { ds } }}</script>React
App.js
// ...import DataSource from 'devextreme/data/data_source';const ds = new DataSource({ // ... onLoadError: (error) => { console.log(error.message); }});class App extends React.Component { // ...}export default App;onLoadingChanged
A function that is executed when the data loading status changes.
jQuery
JavaScript
var ds = new DevExpress.data.DataSource({ onLoadingChanged: function (isLoading) { // Your code goes here }});Angular
TypeScript
import DataSource from "devextreme/data/data_source";// ...export class AppComponent { ds: DataSource; constructor() { this.ds = new DataSource({ onLoadingChanged: (isLoading) => { // Your code goes here } }); }}Vue
App.vue
<script>import DataSource from 'devextreme/data/data_source';const ds = new DataSource({ // ... onLoadingChanged: (isLoading) => { // Your code goes here }});export default { // ... data() { return { ds } }}</script>React
App.js
// ...import DataSource from 'devextreme/data/data_source';const ds = new DataSource({ // ... onLoadingChanged: (isLoading) => { // Your code goes here }});class App extends React.Component { // ...}export default App;pageSize
Specifies the maximum number of data items per page. Applies only if paginate is true.
Type:
Default Value: 20
When data is grouped, this property specifies the number of groups per page. However, in the DataGrid and TreeList, it specifies the number of rows per page including group rows.
paginate
Specifies whether the DataSource loads data items by pages or all at once. Defaults to false if group is set; otherwise, true.
Type:
Default Value: undefined
postProcess
Specifies a post processing function.
Type:
Function parameters:
data:
Array<any>
Data loaded in the DataSource.
Return Value:
Array<any>
Data after processing.
jQuery
JavaScript
var ds = new DevExpress.data.DataSource({ postProcess: function (data) { // Your code goes here }});Angular
TypeScript
import DataSource from "devextreme/data/data_source";// ...export class AppComponent { ds: DataSource; constructor() { this.ds = new DataSource({ postProcess: (data) => { // Your code goes here } }); }}Vue
App.vue
<script>import DataSource from 'devextreme/data/data_source';const ds = new DataSource({ // ... postProcess: (data) => { // Your code goes here }});export default { // ... data() { return { ds } }}</script>React
App.js
// ...import DataSource from 'devextreme/data/data_source';const ds = new DataSource({ // ... postProcess: (data) => { // Your code goes here }});class App extends React.Component { // ...}export default App;ASP.NET MVC Controls
Razor C#
@(Html.DevExtreme().WidgetName() .DataSourceOptions(dso => dso .PostProcess("dataSource_postProcess") ))<script type="text/javascript"> function dataSource_postProcess (data) { // Your code goes here }</script>NOTE
When the paginate property is enabled, the postProcess function handles only data available for the selected page. If you need to access all data, process data before it is passed to the store.
See Also
- Post Processing
pushAggregationTimeout
Specifies the period (in milliseconds) when changes are aggregated before pushing them to the DataSource.
Type:
Default Value: undefined
When this property is undefined, the aggregation period is calculated automatically based on the rendering speed's measurements.
See Also
- push(changes) in: ArrayStore | CustomStore | LocalStore | ODataStore
- reshapeOnPush
requireTotalCount
Specifies whether the DataSource requests the total count of data items in the storage.
Type:
If this property is set to true, the Promise that the load() method returns is resolved with a second argument that contains the totalCount field:
jQuery
index.js
var ds = new DevExpress.data.DataSource({ // ... requireTotalCount: true});ds.load() .done(function (data, extra) { // "data" contains the loaded data // "extra" contains the "totalCount" field });NOTE
When scrolling is infinite in the DataGrid, this property's value is always false.
reshapeOnPush
Specifies whether to reapply sorting, filtering, grouping, and other data processing operations after receiving a push.
Type:
Default Value: false
View Demo
See Also
- pushAggregationTimeout
- push(changes) in: ArrayStore | CustomStore | LocalStore | ODataStore
searchExpr
Specifies the fields to search.
In most cases, you should pass the name of a field by whose value data items are searched. Assign an array of field names to this property if you need to search elements by several field values.
jQuery
JavaScript
var ds = new DevExpress.data.DataSource({ // ... searchExpr: ["firstName", "lastName"]});Angular
TypeScript
import DataSource from "devextreme/data/data_source";// ...export class AppComponent { ds: DataSource; constructor() { this.ds = new DataSource({ // ... searchExpr: ["firstName", "lastName"] }); }}Vue
App.vue
<script>import DataSource from 'devextreme/data/data_source';const ds = new DataSource({ // ... searchExpr: ['firstName', 'lastName']});export default { // ... data() { return { ds } }}</script>React
App.js
// ...import DataSource from 'devextreme/data/data_source';const ds = new DataSource({ // ... searchExpr: ['firstName', 'lastName']});class App extends React.Component { // ...}export default App;You can use this property along with searchOperation and searchValue to specify a simple filter. Use the filter property for more complex filtering conditions. Filters are combined if you specify them in both ways.
NOTE
Searching works when inputting a plain data structure only. However, if you need the searching capability and hierarchical data, transform the plain data using the DataSource's group property.
See Also
- Data Layer - Search API
- Data Layer - Getters and Setters
searchOperation
Specifies the comparison operation used in searching.
Type:
SearchOperation
Default Value: 'contains'
You can use this property with searchExpr and searchValue to specify a simple filter. Use the filter property for more complex filtering conditions. Filters are combined if you specify them in both ways.
See Also
- Data Layer - Search API
searchValue
Specifies the value to which the search expression is compared.
Type: any
Default Value: null
You can use this property along with searchExpr and searchOperation to specify a simple filter. Use the filter property for more complex filtering conditions. Filters are combined if you specify them in both ways.
See Also
- Data Layer - Search API
- Data Layer - Getters and Setters
select
Specifies the fields to select from data objects.
Type:
Select Expression
This property accepts one of the following:
String
A field name to select.Array of strings
Several field names to select.Function
A function implementing custom selection logic.
jQuery
JavaScript
var ds = new DevExpress.data.DataSource({ // ... select: ["firstName", "lastName", "birthDate"] });Angular
TypeScript
import DataSource from "devextreme/data/data_source";// ...export class AppComponent { ds: DataSource; constructor() { this.ds = new DataSource({ // ... select: ["firstName", "lastName", "birthDate"] }); }}Vue
App.vue
<script>import DataSource from 'devextreme/data/data_source';const ds = new DataSource({ // ... select: ['firstName', 'lastName', 'birthDate']});export default { // ... data() { return { ds } }}</script>React
App.js
// ...import DataSource from 'devextreme/data/data_source';const ds = new DataSource({ // ... select: ['firstName', 'lastName', 'birthDate']});class App extends React.Component { // ...}export default App;ASP.NET MVC Controls
Razor C#
@(Html.DevExtreme().WidgetName() .DataSourceOptions(dso => dso .Select("firstName", "lastName", "birthDate") ))See Also
- Select Expressions
sort
Specifies data sorting properties.
Type:
Sort Expression
This property accepts one of the following:
String
The field name to sort by.Object
An object with the following fields:- selector: String
The field name to sort by. - desc: Boolean
Sorts the selector field in descending order.
- selector: String
Array
An array of strings and objects described above.Function
A function that returns the value to sort by.
jQuery
JavaScript
var ds = new DevExpress.data.DataSource({ // ... sort: [ "Position", { selector: "Last_Name", desc: true } ], /* or as a function sort: function(e) { // CEOs are always displayed at the top if(e.Position == "CEO") return "!"; else return e.Position; } */});Angular
TypeScript
import DataSource from "devextreme/data/data_source";// ...export class AppComponent { ds: DataSource; constructor() { this.ds = new DataSource({ // ... sort: [ "Position", { selector: "Last_Name", desc: true } ], /* or as a function sort: function(e) { // CEOs are always displayed at the top if(e.Position == "CEO") return "!"; else return e.Position; } */ }); }}Vue
App.vue
<script>import DataSource from 'devextreme/data/data_source';const ds = new DataSource({ // ... sort: [ 'Position', { selector: 'Last_Name', desc: true } ], /* or as a function sort: function(e) { // CEOs are always displayed at the top if(e.Position == 'CEO') return '!'; else return e.Position; } */});export default { // ... data() { return { ds } }}</script>React
App.js
// ...import DataSource from 'devextreme/data/data_source';const ds = new DataSource({ // ... sort: [ 'Position', { selector: 'Last_Name', desc: true } ], /* or as a function sort: function(e) { // CEOs are always displayed at the top if(e.Position == 'CEO') return '!'; else return e.Position; } */});class App extends React.Component { // ...}export default App;ASP.NET MVC Controls
Razor C#
Razor VB
@(Html.DevExtreme().WidgetName() .DataSourceOptions(dso => dso .Sort("Position", true) // for sorting by a single field // === or === .Sort("sort_function") // === or === .Sort(s => { // for sorting by multiple fields s.AddSorting("Position"); s.AddSorting("Last_Name", true); }) ))<script type="text/javascript"> function sort_function(e) { // CEOs are always displayed at the top if(e.Position == "CEO") return "!"; else return e.Position; }</script>@(Html.DevExtreme().WidgetName() _ .DataSourceOptions(Sub(dso) dso.Sort("Position", True) ' for sorting by a single field ' === or === dso.Sort("sort_function") ' === or === dso.Sort(Sub(s) ' for sorting by multiple fields s.AddSorting("Position") s.AddSorting("Last_Name", True) End Sub) End Sub))<script type="text/javascript"> function sort_function(e) { // CEOs are always displayed at the top if(e.Position == "CEO") return "!"; else return e.Position; }</script>See Also
- Sorting
store
Configures the store underlying the DataSource.
This property accepts one of the following:
Store instance
An ArrayStore, LocalStore, ODataStore, or CustomStore instance.Store configuration object
An ArrayStore, LocalStore, or ODataStore configuration object. Make sure to set the type property.Array
Assigning an array to the store property automatically creates an ArrayStore in the DataSource.
jQuery
JavaScript
var ds = new DevExpress.data.DataSource({ store: new DevExpress.data.ArrayStore({ // ArrayStore instance }) // ===== or ===== store: { type: "array", // ArrayStore configuration object } // ===== or ===== store: [ { id: 1, name: "John Doe" } ]});Angular
TypeScript
import DataSource from "devextreme/data/data_source";import ArrayStore from "devextreme/data/array_store";// ...export class AppComponent { ds: DataSource; constructor() { this.ds = new DataSource({ store: new ArrayStore({ // ArrayStore instance }) // ===== or ===== store: { type: "array", // ArrayStore configuration object } // ===== or ===== store: [ { id: 1, name: "John Doe" } ] }); }}Vue
App.vue
<script>import DataSource from 'devextreme/data/data_source';import ArrayStore from 'devextreme/data/array_store';const ds = new DataSource({ store: new ArrayStore({ // ArrayStore instance }) // ===== or ===== store: { type: 'array', // ArrayStore configuration object } // ===== or ===== store: [ { id: 1, name: 'John Doe' } ]});export default { // ... data() { return { ds } }}</script>React
App.js
// ...import DataSource from 'devextreme/data/data_source';import ArrayStore from 'devextreme/data/array_store';const ds = new DataSource({ store: new ArrayStore({ // ArrayStore instance }) // ===== or ===== store: { type: 'array', // ArrayStore configuration object } // ===== or ===== store: [ { id: 1, name: 'John Doe' } ]});class App extends React.Component { // ...}export default App;Was this topic helpful?
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