JavaScript/jQuery NumberBox - Keyboard Support

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

Key Action
↑ or mouse wheel up Increases the UI component value by a step.
↓ or mouse wheel down Decreases the UI component value by a step.

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

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

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

import DxNumberBox from 'devextreme-vue/number-box';

const myNumberBoxRef = 'my-number-box';

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

import { NumberBox } from 'devextreme-react/number-box';

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

        this.numberBoxRef = React.createRef();
    }

    render() {
        return (
            <NumberBox ref={this.numberBoxRef} />
        );
    }

    get numberBox() {
        return this.numberBoxRef.current.instance;
    }

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

export default App;
See Also