JavaScript/jQuery SelectBox Methods
This section describes members used to manipulate data.
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
content()
Gets the popup window's content.
An HTML element or a jQuery element when you use jQuery.
See Also
defaultOptions(rule)
Specifies the device-dependent default configuration properties for this component.
The component's default device properties.
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 SelectBox UI component in an application executed on the desktop.
jQuery
DevExpress.ui.dxSelectBox.defaultOptions({ device: { deviceType: "desktop" }, options: { // Here go the SelectBox properties } });
Angular
import SelectBox, { Properties } from "devextreme/ui/select_box"; // ... export class AppComponent { constructor () { SelectBox.defaultOptions<Properties>({ device: { deviceType: "desktop" }, options: { // Here go the SelectBox properties } }); } }
Vue
<template> <div> <DxSelectBox id="selectBox1" /> <DxSelectBox id="selectBox2" /> </div> </template> <script> import DxSelectBox from "devextreme-vue/select-box"; import SelectBox from "devextreme/ui/select_box"; SelectBox.defaultOptions({ device: { deviceType: "desktop" }, options: { // Here go the SelectBox properties } }); export default { components: { DxSelectBox } } </script>
React
import dxSelectBox from "devextreme/ui/select_box"; import SelectBox from "devextreme-react/select-box"; dxSelectBox.defaultOptions({ device: { deviceType: "desktop" }, options: { // Here go the SelectBox properties } }); export default function App() { return ( <div> <SelectBox id="selectBox1" /> <SelectBox id="selectBox2" /> </div> ) }
You can also set rules for multiple device types:
jQuery
const devicesConfig = [ { deviceType: 'desktop' }, { deviceType: 'tablet' }, { deviceType: 'phone' }, ]; devicesConfig.forEach(deviceConfig => { DevExpress.ui.dxSelectBox.defaultOptions({ device: deviceConfig, options: { // Here go the SelectBox properties } }); });
Angular
import SelectBox, { Properties } from "devextreme/ui/select_box"; // ... export class AppComponent { constructor () { const devicesConfig = [ { deviceType: 'desktop' }, { deviceType: 'tablet' }, { deviceType: 'phone' }, ]; devicesConfig.forEach(deviceConfig => { SelectBox.defaultOptions<Properties>({ device: deviceConfig, options: { // Here go the SelectBox properties } }); }); } }
Vue
<template> <div> <DxSelectBox /> </div> </template> <script> import DxSelectBox from "devextreme-vue/select-box"; import SelectBox from "devextreme/ui/select_box"; const devicesConfig = [ { deviceType: 'desktop' }, { deviceType: 'tablet' }, { deviceType: 'phone' }, ]; devicesConfig.forEach(deviceConfig => { SelectBox.defaultOptions({ device: deviceConfig, options: { // Here go the SelectBox properties } }); }); export default { components: { DxSelectBox } } </script>
React
import dxSelectBox from "devextreme/ui/select_box"; import SelectBox from "devextreme-react/select-box"; const devicesConfig = [ { deviceType: 'desktop' }, { deviceType: 'tablet' }, { deviceType: 'phone' }, ]; devicesConfig.forEach(deviceConfig => { dxSelectBox.defaultOptions({ device: deviceConfig, options: { // Here go the SelectBox properties } }); }); export default function App() { return ( <div> <SelectBox /> </div> ) }
dispose()
Disposes of all the resources allocated to the SelectBox instance.
jQuery
After calling this method, remove the DOM element associated with the UI component:
$("#mySelectBox").dxSelectBox("dispose"); $("#mySelectBox").remove();
Angular
Use conditional rendering instead of this method:
<dx-select-box ... *ngIf="condition"> </dx-select-box>
Vue
Use conditional rendering instead of this method:
<template> <DxSelectBox ... v-if="condition"> </DxSelectBox> </template> <script> import DxSelectBox from 'devextreme-vue/select-box'; export default { components: { DxSelectBox } } </script>
React
Use conditional rendering instead of this method:
import React from 'react'; import SelectBox from 'devextreme-react/select-box'; function DxSelectBox(props) { if (!props.shouldRender) { return null; } return ( <SelectBox ... > </SelectBox> ); } class App extends React.Component { render() { return ( <DxSelectBox shouldRender="condition" /> ); } } export default App;
element()
Gets the root UI component element.
An HTML element or a jQuery element when you use jQuery.
See Also
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
field()
Gets the UI component's <input>
element.
An HTML element or a jQuery element when you use jQuery.
See Also
getButton(name)
Gets an instance of a custom action button.
Use the returned button instance to call the Button UI component's methods, for example, focus():
jQuery
const myCustomButton = $("#selectBoxContainer").dxSelectBox("getButton", "myCustomButton"); myCustomButton.focus();
Angular
import { Component, ViewChild } from '@angular/core'; import { DxSelectBoxComponent } from 'devextreme-angular'; @Component({ selector: 'app-root', templateUrl: './app.component.html', styleUrls: ['./app.component.css'] }) export class AppComponent { @ViewChild('selectBoxRef', { static: false }) selectBox: DxSelectBoxComponent; // Prior to Angular 8 // @ViewChild('selectBoxRef') selectBox: DxSelectBoxComponent; setFocus() { this.selectBox.instance.getButton('myCustomButton').focus(); } }
<dx-select-box #selectBoxRef ... > </dx-select-box>
Vue
<template> <DxSelectBox ... :ref="selectBoxRef"> </DxSelectBox> </template> <script> import 'devextreme/dist/css/dx.light.css'; import DxSelectBox from 'devextreme-vue/select-box'; export default { components: { DxSelectBox }, data() { return { selectBoxRef } }, methods: { setFocus() { this.selectBox.getButton('myCustomButton').focus(); } }, computed: { selectBox: function() { return this.$refs[selectBoxRef].instance; } } } </script>
React
import React from 'react'; import 'devextreme/dist/css/dx.light.css'; import SelectBox from 'devextreme-react/select-box'; class App extends React.Component { constructor(props) { super(props); this.selectBoxRef = React.createRef(); this.setFocus = () => { this.selectBox.getButton('myCustomButton').focus(); }; } get selectBox() { return this.selectBoxRef.current.instance(); } render() { return ( <SelectBox ... ref={this.selectBoxRef}> </SelectBox> ); } } export default App;
getDataSource()
Gets the DataSource instance.
The DataSource instance.
See Also
getInstance(element)
Gets the instance of a UI component found using its DOM node.
The UI component's instance.
getInstance is a static method that the UI component class supports. The following code demonstrates how to get the SelectBox instance found in an element with the mySelectBox
ID:
// Modular approach import SelectBox from "devextreme/ui/select_box"; ... let element = document.getElementById("mySelectBox"); let instance = SelectBox.getInstance(element) as SelectBox; // Non-modular approach let element = document.getElementById("mySelectBox"); let instance = DevExpress.ui.dxSelectBox.getInstance(element);
See Also
instance()
Gets the UI component's instance. Use it to access other methods of the UI component.
This UI component's instance.
See Also
off(eventName)
Detaches all event handlers from a single event.
The event's name.
The object for which this method is called.
See Also
off(eventName, eventHandler)
Detaches a particular event handler from a single event.
The object for which this method is called.
See Also
on(eventName, eventHandler)
Subscribes to an event.
The object for which this method is called.
Use this method to subscribe to one of the events listed in the Events section.
See Also
on(events)
Subscribes to events.
Events with their handlers: { "eventName1": handler1, "eventName2": handler2, ...}
The object for which this method is called.
Use this method to subscribe to several events with one method call. Available events are listed in the Events section.
See Also
option(optionName)
Gets the value of a single property.
The property's name or full path.
This property's value.
See Also
option(options)
Updates the values of several properties.
Options with their new values.
See Also
registerKeyHandler(key, handler)
Registers a handler to be executed when a user presses a specific key.
A key.
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
reset(value)
Resets the value property to the value passed as an argument.
Specifies the new value.
resetOption(optionName)
Resets a property to its default value.
A property's name.