DevExtreme jQuery - 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
- Call Methods: Angular | Vue | React | jQuery | AngularJS | Knockout | ASP.NET MVC 5 | ASP.NET Core
- TreeView Demos
- TreeView API Reference
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