Angular Menu - Keyboard Support

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

Key Action
← Closes the submenu and focuses on its parent item.
→ Opens the submenu of the focused item.
Home Sets focus to the first item in the menu/submenu.
End Sets focus to the last item in the menu/submenu.
Space Switches the focused item to the selected state.
Enter Chooses the focused item.

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

jQuery
JavaScript
function registerKeyHandlers () {
    const menu = $("#menuContainer").dxMenu("instance");
    menu.registerKeyHandler("backspace", function(e) {
        // The argument "e" contains information on the event
    });
    menu.registerKeyHandler("space", function(e) {
        // ...
    });
}
Angular
TypeScript
import { ..., ViewChild, AfterViewInit } from '@angular/core';
import { DxMenuModule, DxMenuComponent } from 'devextreme-angular';
// ...
export class AppComponent implements AfterViewInit {
    @ViewChild(DxMenuComponent, { static: false }) menu: DxMenuComponent;
    // Prior to Angular 8
    // @ViewChild(DxMenuComponent) menu: DxMenuComponent;

    ngAfterViewInit () {
        this.menu.instance.registerKeyHandler('backspace', function(e) {
            // The argument "e" contains information on the event
        });
        this.menu.instance.registerKeyHandler('space', function(e) {
            // ...
        });
    }
}
@NgModule({
    imports: [
        // ...
        DxMenuModule
    ],
    // ...
})
Vue
<template>
    <DxMenu :ref="myMenuRef" />
</template>
<script>
import 'devextreme/dist/css/dx.common.css';
import 'devextreme/dist/css/dx.light.css';

import DxMenu from 'devextreme-vue/menu';

const myMenuRef = 'my-menu';

export default {
    components: {
        DxMenu
    },
    data() {
        return {
            myMenuRef
        }
    },
    computed: {
        menu: function() {
            return this.$refs[myMenuRef].instance;
        }
    },
    mounted: function() {
        this.menu.registerKeyHandler('backspace', function(e) {
            // The argument "e" contains information on the event
        });
        this.menu.registerKeyHandler('space', function(e) {
            // ...
        });
    }
}
</script>
React
App.js
import React from 'react';
import 'devextreme/dist/css/dx.common.css';
import 'devextreme/dist/css/dx.light.css';

import { Menu } from 'devextreme-react/menu';

class App extends React.Component {
    constructor(props) {
        super(props);

        this.menuRef = React.createRef();
    }

    render() {
        return (
            <Menu ref={this.menuRef} />
        );
    }

    get menu() {
        return this.menuRef.current.instance;
    }

    componentDidMount() {
        this.menu.registerKeyHandler('backspace', function(e) {
            // The argument "e" contains information on the event
        });
        this.menu.registerKeyHandler('space', function(e) {
            // ...
        });
    }
}

export default App;
See Also