DevExtreme Angular - Keyboard Support

An end user can use the following keys to interact with the widget.

Key Action
Shift + Mouse Wheel Scrolls the content left/right if the scrollDirection option is "horizontal" or "both".
↑ / ↓ Moves focus to the previous/next node.
Home / End Moves focus to the first/last node.
→ Expands the node.
← Collapses the node.
Asterisk Sign (*) Expands all nodes. Available only if expandAllEnabled is set to true.
Minus Sign (-) Collapses all nodes. Available only if expandAllEnabled is set to true.
Enter or Space Selects the node.
Shift + ↑ / Shift + ↓ Extends selection up/down by one node.
Shift + Home Extends selection up to the first node.
Shift + End Extends selection down to the last node.

You can implement a custom handler for a key using the registerKeyHandler(key, handler) method.

jQuery
JavaScript
function registerKeyHandlers () {
    let treeView =  $("#treeViewContainer").dxTreeView("instance");
    treeView.registerKeyHandler("backspace", function (e) {
        // The argument "e" contains information on the event
    });
    treeView.registerKeyHandler("space", function (e) {
        // ...
    });
}
Angular
TypeScript
import { ..., ViewChild, AfterViewInit } from "@angular/core";
import { DxTreeViewModule, DxTreeViewComponent } from "devextreme-angular";
// ...
export class AppComponent implements AfterViewInit {
    @ViewChild(DxTreeViewComponent, { static: false }) treeView: DxTreeViewComponent
    // Prior to Angular 8
    // @ViewChild(DxTreeViewComponent) treeView: DxTreeViewComponent
    ngAfterViewInit () {
        this.treeView.instance.registerKeyHandler("backspace", function (e) {
            // The argument "e" contains information on the event
        });
        this.treeView.instance.registerKeyHandler("space", function (e) {
            // ...
        });
    }
}
@NgModule({
    imports: [
        // ...
        DxTreeViewModule
    ],
    // ...
})
See Also