Angular RadioGroup - Keyboard Support

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

Key Action
↑ or Page Up Moves focus to the previous radio button.
↓ or Page Down Moves focus to the next radio button.
Home / End Moves focus to the first/last radio button.
Enter or Space Selects the focused radio button.

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

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

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

import DxRadioGroup from 'devextreme-vue/radio-group';

const myRadioGroupRef = 'my-radio-group';

export default {
    components: {
        DxRadioGroup
    },
    data() {
        return {
            myRadioGroupRef
        }
    },
    computed: {
        radioGroup: function() {
            return this.$refs[myRadioGroupRef].instance;
        }
    },
    mounted: function() {
        this.radioGroup.registerKeyHandler('backspace', function(e) {
            // The argument "e" contains information on the event
        });
        this.radioGroup.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 { RadioGroup } from 'devextreme-react/radio-group';

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

        this.radioGroupRef = React.createRef();
    }

    render() {
        return (
            <RadioGroup ref={this.radioGroupRef} />
        );
    }

    get radioGroup() {
        return this.radioGroupRef.current.instance;
    }

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

export default App;
See Also