React DropDownButton - Keyboard Support

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

Key Action
← Moves focus to the action button when splitButton is enabled.
→ Moves focus to the toggle button when splitButton is enabled.
Enter / Space Opens the drop-down menu when the toggle button is focused.
Simulates a click action when the action button is focused.
Selects a menu item when focused.
↑ / ↓ Moves focus to the previous/following menu item.
↓ Opens the drop-down menu.
Esc Closes the drop-down menu.
Page Up / Page Down Moves focus to the first/last menu item on the page.
Home / End Moves focus to the first/last menu item.

Use the registerKeyHandler(key, handler) method to implement a custom handler for a key.

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

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

import DxDropDownButton from 'devextreme-vue/drop-down-button';

const myDropDownButtonRef = 'my-drop-down-button';

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

import { DropDownButton } from 'devextreme-react/drop-down-button';

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

        this.dropDownButtonRef = React.createRef();
    }

    render() {
        return (
            <DropDownButton ref={this.dropDownButtonRef} />
        );
    }

    get dropDownButton() {
        return this.dropDownButtonRef.current.instance;
    }

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

export default App;
See Also
jQuery
Angular
Vue
React