JavaScript/jQuery Slider - Handle the Value Change Event
To process a new Slider value, you need to handle the value change event. If the handling function is not going to be changed during the lifetime of the UI component, assign it to the onValueChanged property when you configure the UI component.
jQuery
$(function() { $("#sliderContainer").dxSlider({ onValueChanged: function (e) { const previousValue = e.previousValue; const newValue = e.value; // Event handling commands go here } }); });
Angular
<dx-slider [(value)]="value" (onValueChanged)="handleValueChange($event)"> </dx-slider>
import { DxSliderModule } from "devextreme-angular"; // ... export class AppComponent { value = 25; handleValueChange (e) { const previousValue = e.previousValue; const newValue = e.value; // Event handling commands go here }; } @NgModule({ imports: [ // ... DxSliderModule ], // ... })
Vue
<template> <DxSlider v-model:value="value" @value-changed="handleValueChange" /> </template> <script> import 'devextreme/dist/css/dx.light.css'; import { DxSlider } from 'devextreme-vue/slider'; export default { components: { DxSlider }, data() { return { value: 25 }; }, methods: { handleValueChange(e) { const previousValue = e.previousValue; const newValue = e.value; // Event handling commands go here } } } </script>
React
import React from 'react'; import 'devextreme/dist/css/dx.light.css'; import { Slider } from 'devextreme-react/slider'; class App extends React.Component { constructor(props) { super(props); this.state = { value: 25 }; this.handleValueChange = this.handleValueChange.bind(this); } handleValueChange(e) { const previousValue = e.previousValue; const newValue = e.value; // Event handling commands go here this.setState({ value: newValue }); } render() { return ( <Slider value={this.state.value} onValueChanged={this.handleValueChange} /> ); } } export default App;
If you are going to change event handlers at runtime, or if you need to attach several handlers to the value change event, subscribe to this event using the on(eventName, eventHandler) method. This approach is more typical of jQuery.
const valueChangedHandler1 = function (e) { const previousValue = e.previousValue; const newValue = e.value; // First handler of the "valueChanged" event }; const valueChangedHandler2 = function (e) { const previousValue = e.previousValue; const newValue = e.value; // Second handler of the "valueChanged" event }; $("#sliderContainer").dxSlider("instance") .on("valueChanged", valueChangedHandler1) .on("valueChanged", valueChangedHandler2);
See Also
- Handle Events: Angular | Vue | React | jQuery | AngularJS | Knockout
- Slider Demos
- Slider API Reference
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