beginUpdate()
Postpones rendering that can negatively affect performance until the endUpdate() method is called.
The beginUpdate() and endUpdate() methods reduce the number of renders in cases where extra rendering can negatively affect performance.
See Also
defaultOptions(rule)
Name | Type | Description |
---|---|---|
device | | |
Device parameters. |
options |
Options to be applied. |
defaultOptions is a static method that the UI component class supports. The following code demonstrates how to specify default properties for all instances of the RangeSlider UI component in an application executed on the desktop.
jQuery
DevExpress.ui.dxRangeSlider.defaultOptions({ device: { deviceType: "desktop" }, options: { // Here go the RangeSlider properties } });
Angular
import RangeSlider, { Properties } from "devextreme/ui/range_slider"; // ... export class AppComponent { constructor () { RangeSlider.defaultOptions<Properties>({ device: { deviceType: "desktop" }, options: { // Here go the RangeSlider properties } }); } }
Vue
<template> <div> <DxRangeSlider id="rangeSlider1" /> <DxRangeSlider id="rangeSlider2" /> </div> </template> <script> import DxRangeSlider from "devextreme-vue/range-slider"; import RangeSlider from "devextreme/ui/range_slider"; RangeSlider.defaultOptions({ device: { deviceType: "desktop" }, options: { // Here go the RangeSlider properties } }); export default { components: { DxRangeSlider } } </script>
React
import dxRangeSlider from "devextreme/ui/range_slider"; import RangeSlider from "devextreme-react/range-slider"; dxRangeSlider.defaultOptions({ device: { deviceType: "desktop" }, options: { // Here go the RangeSlider properties } }); export default function App() { return ( <div> <RangeSlider id="rangeSlider1" /> <RangeSlider id="rangeSlider2" /> </div> ) }
You can also set rules for multiple device types:
jQuery
const devicesConfig = [ { deviceType: 'desktop' }, { deviceType: 'tablet' }, { deviceType: 'phone' }, ]; devicesConfig.forEach(deviceConfig => { DevExpress.ui.dxRangeSlider.defaultOptions({ device: deviceConfig, options: { // Here go the RangeSlider properties } }); });
Angular
import RangeSlider, { Properties } from "devextreme/ui/range_slider"; // ... export class AppComponent { constructor () { const devicesConfig = [ { deviceType: 'desktop' }, { deviceType: 'tablet' }, { deviceType: 'phone' }, ]; devicesConfig.forEach(deviceConfig => { RangeSlider.defaultOptions<Properties>({ device: deviceConfig, options: { // Here go the RangeSlider properties } }); }); } }
Vue
<template> <div> <DxRangeSlider /> </div> </template> <script> import DxRangeSlider from "devextreme-vue/range-slider"; import RangeSlider from "devextreme/ui/range_slider"; const devicesConfig = [ { deviceType: 'desktop' }, { deviceType: 'tablet' }, { deviceType: 'phone' }, ]; devicesConfig.forEach(deviceConfig => { RangeSlider.defaultOptions({ device: deviceConfig, options: { // Here go the RangeSlider properties } }); }); export default { components: { DxRangeSlider } } </script>
React
import dxRangeSlider from "devextreme/ui/range_slider"; import RangeSlider from "devextreme-react/range-slider"; const devicesConfig = [ { deviceType: 'desktop' }, { deviceType: 'tablet' }, { deviceType: 'phone' }, ]; devicesConfig.forEach(deviceConfig => { dxRangeSlider.defaultOptions({ device: deviceConfig, options: { // Here go the RangeSlider properties } }); }); export default function App() { return ( <div> <RangeSlider /> </div> ) }
dispose()
jQuery
After calling this method, remove the DOM element associated with the UI component:
$("#myRangeSlider").dxRangeSlider("dispose"); $("#myRangeSlider").remove();
Angular
Use conditional rendering instead of this method:
<dx-range-slider ... *ngIf="condition"> </dx-range-slider>
Vue
Use conditional rendering instead of this method:
<template> <DxRangeSlider ... v-if="condition"> </DxRangeSlider> </template> <script> import DxRangeSlider from 'devextreme-vue/range-slider'; export default { components: { DxRangeSlider } } </script>
React
Use conditional rendering instead of this method:
import React from 'react'; import RangeSlider from 'devextreme-react/range-slider'; function DxRangeSlider(props) { if (!props.shouldRender) { return null; } return ( <RangeSlider ... > </RangeSlider> ); } class App extends React.Component { render() { return ( <DxRangeSlider shouldRender="condition" /> ); } } export default App;
endUpdate()
Refreshes the UI component after a call of the beginUpdate() method.
The beginUpdate() and endUpdate() methods reduce the number of renders in cases where extra rendering can negatively affect performance.
See Also
getInstance(element)
getInstance is a static method that the UI component class supports. The following code demonstrates how to get the RangeSlider instance found in an element with the myRangeSlider
ID:
// Modular approach import RangeSlider from "devextreme/ui/range_slider"; ... let element = document.getElementById("myRangeSlider"); let instance = RangeSlider.getInstance(element) as RangeSlider; // Non-modular approach let element = document.getElementById("myRangeSlider"); let instance = DevExpress.ui.dxRangeSlider.getInstance(element);
See Also
on(eventName, eventHandler)
Use this method to subscribe to one of the events listed in the Events section.
See Also
on(events)
Use this method to subscribe to several events with one method call. Available events are listed in the Events section.
See Also
registerKeyHandler(key, handler)
A handler. Accepts the keydown event as the argument. It is a EventObject or a jQuery.Event when you use jQuery.
The key argument accepts one of the following values:
- "backspace"
- "tab"
- "enter"
- "escape"
- "pageUp"
- "pageDown"
- "end"
- "home"
- "leftArrow"
- "upArrow"
- "rightArrow"
- "downArrow"
- "del"
- "space"
- "F"
- "A"
- "asterisk"
- "minus"
A custom handler for a key cancels the default handler for this key.
See Also
repaint()
Renders the component again without reloading data. Use the method to update the component's markup and appearance dynamically.
The repaint()
method re-initializes the component with new settings, resetting its state and history.
See Also
- reload() in DataSource | List
- refresh() in DataGrid | TreeList
If you have technical questions, please create a support ticket in the DevExpress Support Center.