DevExtreme Angular - Selection

NOTE
You must specify the DataGrid's keyExpr or the Store's key option to ensure that selection works properly.
See Also

User Interaction

The DataGrid widget supports single and multiple row selection. Use the selection.mode option to change the current mode.

jQuery
JavaScript
$(function() {
    $("#dataGridContainer").dxDataGrid({
        // ...
        selection: {
            mode: "single" // or "multiple" | "none"
        }
    });
});
Angular
HTML
TypeScript
<dx-data-grid ... >
    <dxo-selection
        mode="single"> <!-- "multiple" | "none" -->
    </dxo-selection>
</dx-data-grid>
import { DxDataGridModule } from "devextreme-angular";
// ...
export class AppComponent {
    // ...
}
@NgModule({
    imports: [
        // ...
        DxDataGridModule
    ],
    // ...
})

In the single mode, only one row can be selected at a time, while in the multiple mode, several rows can be selected with check boxes that appear in the selection column.

DevExtreme HTML5 JavaScript jQuery Angular Knockout Widget DataGrid Sorting

The check box in the column's header selects all rows or only the currently rendered ones, depending on the selectAllMode. Note that clicking this check box selects/deselects only those rows that meet filtering conditions if a filter is applied.

jQuery
JavaScript
$(function() {
    $("#dataGridContainer").dxDataGrid({
        // ...
        selection: {
            mode: "multiple",
            selectAllMode: "page" // or "allPages"
        }
    });
});
Angular
HTML
TypeScript
<dx-data-grid ... >
    <dxo-selection
        mode="multiple"
        selectAllMode="page">   <!-- or "allPages" -->
    </dxo-selection>
</dx-data-grid>
import { DxDataGridModule } from "devextreme-angular";
// ...
export class AppComponent {
    // ...
}
@NgModule({
    imports: [
        // ...
        DxDataGridModule
    ],
    // ...
})

You can prevent users from selecting all rows by setting the selection.allowSelectAll option to false.

jQuery
JavaScript
$(function() {
    $("#dataGridContainer").dxDataGrid({
        // ...
        selection: {
            mode: "multiple",
            allowSelectAll: false
        }
    });
});
Angular
HTML
TypeScript
<dx-data-grid ... >
    <dxo-selection
        mode="multiple"
        [allowSelectAll]="false">
    </dxo-selection>
</dx-data-grid>
import { DxDataGridModule } from "devextreme-angular";
// ...
export class AppComponent {
    // ...
}
@NgModule({
    imports: [
        // ...
        DxDataGridModule
    ],
    // ...
})

The showCheckBoxesMode option specifies when the widget renders check boxes in the selection column. For example, the following code tells the widget to never render them, though a user can still select rows using keyboard shortcuts:

jQuery
JavaScript
$(function() {
    $("#dataGridContainer").dxDataGrid({
        // ...
        selection: {
            mode: "multiple",
            showCheckBoxesMode: "none"    // or "onClick" | "onLongTap" | "always" 
        }
    });
});
Angular
HTML
TypeScript
<dx-data-grid ... >
    <dxo-selection
        mode="multiple"
        showCheckBoxesMode="none">    <!-- or "onClick" | "onLongTap" | "always" -->
    </dxo-selection>
</dx-data-grid>
import { DxDataGridModule } from "devextreme-angular";
// ...
export class AppComponent {
    // ...
}
@NgModule({
    imports: [
        // ...
        DxDataGridModule
    ],
    // ...
})

Single Selection Demo Multiple Selection Demo

See Also

API

Initial and Runtime Selection

Use the selectedRowKeys option to select rows initially. Note that to access a row by its key, you should specify the DataGrid's keyExpr or the Store's key option.

jQuery
JavaScript
$(function() {
    $("#dataGridContainer").dxDataGrid({
        // ...
        dataSource: {
            store: {
                // ...
                key: "id"
            }
        },
        selectedRowKeys: [1, 5, 18]
    });
});
Angular
HTML
TypeScript
<dx-data-grid
    [dataSource]="dataGridDataSource"
    [selectedRowKeys]="[1, 5, 18]">
</dx-data-grid>
import { DxDataGridModule } from "devextreme-angular";
import DataSource from "devextreme/data/data_source";
import "devextreme/data/array_store";
// or
// import "devextreme/data/odata/store";
// import "devextreme/data/custom_store";
// ...
export class AppComponent {
    dataGridDataSource = new DataSource({
        store: {
            // ...
            key: "id"
        }
    });
}
@NgModule({
    imports: [
        // ...
        DxDataGridModule
    ],
    // ...
})

The DataGrid provides two methods that select rows at runtime: selectRows(keys, preserve) and selectRowsByIndexes(indexes). They both clear the previous selection by default, although with the selectRows(keys, preserve) method you can keep it if you pass true as the preserve parameter. Before selecting a row, you can call the isRowSelected(key) method to check if this row is not already selected.

jQuery
JavaScript
var selectSingleRow = function (dataGridInstance, key, preserve) {
    if (!dataGridInstance.isRowSelected(key)) {
        dataGridInstance.selectRows([key], preserve);
    }
}
JavaScript
$("#dataGridContainer").dxDataGrid({
    // ...
    onContentReady: function (e) {
        // Selects the first visible row
        e.component.selectRowsByIndexes([0]);
    }
}).dxDataGrid("instance");
Angular
TypeScript
HTML
import { ..., ViewChild } from "@angular/core";
import { DxDataGridModule, DxDataGridComponent } from "devextreme-angular";
// ...
export class AppComponent {
    @ViewChild(DxDataGridComponent) dataGrid: DxDataGridComponent;
    selectSingleRow (key, preserve) {
        if (!this.dataGrid.instance.isRowSelected(key)) {
            this.dataGrid.instance.selectRows([key], preserve);
        }
    }
    onContentReadyHandler (e) {
        // Selects the first visible row
        e.component.selectRowsByIndexes([0]);
    }
}
@NgModule({
    imports: [
        // ...
        DxDataGridModule
    ],
    // ...
})
<dx-data-grid ...
    (onContentReady)="onContentReadyHandler($event)">
</dx-data-grid>

To select all rows at once, call the selectAll() method.

jQuery
JavaScript
dataGrid.selectAll();
Angular
TypeScript
import { ..., ViewChild } from "@angular/core";
import { DxDataGridModule, DxDataGridComponent } from "devextreme-angular";
// ...
export class AppComponent {
    @ViewChild(DxDataGridComponent) dataGrid: DxDataGridComponent;
    selectAllRows () {
        this.dataGrid.instance.selectAll();
    }
}
@NgModule({
    imports: [
        // ...
        DxDataGridModule
    ],
    // ...
})

View Demo

Call the getSelectedRowKeys() or getSelectedRowsData() method to get the selected row's keys or data.

jQuery
JavaScript
var dataGrid = $("#dataGridContainer").dxDataGrid("instance");
var selectedKeys = dataGrid.getSelectedRowKeys();
var selectedData = dataGrid.getSelectedRowsData();
Angular
TypeScript
import { ..., ViewChild } from "@angular/core";
import { DxDataGridModule, DxDataGridComponent } from "devextreme-angular";
// ...
export class AppComponent {
    @ViewChild(DxDataGridComponent) dataGrid: DxDataGridComponent;
    getSelectedRowKeys () {
        return this.dataGrid.instance.getSelectedRowKeys();
    }
    getSelectedRowsData () {
        return this.dataGrid.instance.getSelectedRowsData();
    }
}
@NgModule({
    imports: [
        // ...
        DxDataGridModule
    ],
    // ...
})
See Also

Clear Selection Settings

Call the deselectRows(keys) method to clear the selection of specific rows.

jQuery
JavaScript
$("#dataGridContainer").dxDataGrid("deselectRows", [1, 4, 10]);
Angular
TypeScript
import { ..., ViewChild } from "@angular/core";
import { DxDataGridModule, DxDataGridComponent } from "devextreme-angular";
// ...
export class AppComponent {
    @ViewChild(DxDataGridComponent) dataGrid: DxDataGridComponent;
    deselectRows (keys) {
        this.dataGrid.instance.deselectRows(keys);
    }
}
@NgModule({
    imports: [
        // ...
        DxDataGridModule
    ],
    // ...
})

Call the clearSelection() method to clear selection of all rows. If you apply a filter and want to keep the selection of invisible rows that do not meet the filtering conditions, use the deselectAll() method. Also call this method to clear selection depending on the selectAllMode.

jQuery
JavaScript
var dataGrid = $("#dataGridContainer").dxDataGrid("instance");
dataGrid.deselectAll();
dataGrid.clearSelection();
Angular
TypeScript
import { ..., ViewChild } from "@angular/core";
import { DxDataGridModule, DxDataGridComponent } from "devextreme-angular";
// ...
export class AppComponent {
    @ViewChild(DxDataGridComponent) dataGrid: DxDataGridComponent;
    deselectVisibleRows () {
        this.dataGrid.instance.deselectAll();
    }
    deselectAllRows () {
        this.dataGrid.instance.clearSelection();
    }
}
@NgModule({
    imports: [
        // ...
        DxDataGridModule
    ],
    // ...
})

View Demo

See Also

Events

The DataGrid widget raises the selectionChanged event when a row is selected, or the selection is cleared. If the function that handles this event is going to remain unchanged, assign it to the onSelectionChanged option when you configure the widget. Note that information on selected and deselected rows is passed to the handler only when selection is not deferred.

jQuery
JavaScript
$(function() {
    $("#dataGridContainer").dxDataGrid({
        onSelectionChanged: function(e) { // Handler of the "selectionChanged" event
            var currentSelectedRowKeys = e.currentSelectedRowKeys;
            var currentDeselectedRowKeys = e.currentDeselectedRowKeys;
            var allSelectedRowKeys = e.selectedRowKeys;
            var allSelectedRowsData = e.selectedRowsData;
            // ...
        }
    });
});
Angular
HTML
TypeScript
<dx-data-grid ...
    (onSelectionChanged)="onSelectionChanged($event)">
</dx-data-grid>
import { DxDataGridModule } from "devextreme-angular";
// ...
export class AppComponent {
    onSelectionChanged (e) { // Handler of the "selectionChanged" event
        let currentSelectedRowKeys = e.currentSelectedRowKeys;
        let currentDeselectedRowKeys = e.currentDeselectedRowKeys;
        let allSelectedRowKeys = e.selectedRowKeys;
        let allSelectedRowsData = e.selectedRowsData;
        // ...
    }
}
@NgModule({
    imports: [
        // ...
        DxDataGridModule
    ],
    // ...
})

If you are going to change the event handler at runtime, or if you need to attach several handlers to the event, subscribe to it using the on(eventName, eventHandler) method. This approach is more typical of jQuery.

JavaScript
var selectionChangedEventHandler1 = function(e) {
    // First handler of the "selectionChanged" event
};

var selectionChangedEventHandler2 = function(e) {
    // Second handler of the "selectionChanged" event
};

$("#dataGridContainer").dxDataGrid("instance")
    .on("selectionChanged", selectionChangedEventHandler1)
    .on("selectionChanged", selectionChangedEventHandler2);
See Also