Angular DropDownButton Methods
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beginUpdate()
Prevents the widget from refreshing until the endUpdate() method is called.
The beginUpdate() and endUpdate() methods prevent the widget from excessive updates when you are changing multiple widget settings at once. After the beginUpdate() method is called, the widget does not update its UI until the endUpdate() method is called.
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- Call Methods: Angular | Vue | React | jQuery | AngularJS | Knockout | ASP.NET MVC 5 | ASP.NET Core
close()
A Promise that is resolved when the drop-down menu is closed. It is a native Promise or a jQuery.Promise when you use jQuery.
defaultOptions(rule)
defaultOptions is a static method that the widget class supports. The following code demonstrates how to specify default options for all instances of the DropDownButton widget in an application executed on the desktop.
jQuery
DevExpress.ui.dxDropDownButton.defaultOptions({ device: { deviceType: "desktop" }, options: { // Here go the DropDownButton options } });
Angular
import DropDownButton from "devextreme/ui/drop_down_button"; // ... export class AppComponent { constructor () { DropDownButton.defaultOptions({ device: { deviceType: "desktop" }, options: { // Here go the DropDownButton options } }); } }
Vue
<template> <div> <DxDropDownButton id="dropDownButton1" /> <DxDropDownButton id="dropDownButton2" /> </div> </template> <script> import DxDropDownButton from "devextreme-vue/drop-down-button"; import DropDownButton from "devextreme/ui/drop_down_button"; DropDownButton.defaultOptions({ device: { deviceType: "desktop" }, options: { // Here go the DropDownButton options } }); export default { components: { DxDropDownButton } } </script>
React
import React from "react"; import dxDropDownButton from "devextreme/ui/drop_down_button"; import DropDownButton from "devextreme-react/drop-down-button"; class App extends React.Component { render () { dxDropDownButton.defaultOptions({ device: { deviceType: "desktop" }, options: { // Here go the DropDownButton options } }) return ( <div> <DropDownButton id="dropDownButton1" /> <DropDownButton id="dropDownButton2" /> </div> ) } } export default App;
dispose()
After calling this method, remove the DOM element associated with the widget:
jQuery
$("#myDropDownButton").dxDropDownButton("dispose"); $("#myDropDownButton").remove();
Angular
<dx-drop-down-button #dropDownButtonVar id="myDropDownButton"></dx-drop-down-button>
import { ..., ViewChild } from "@angular/core"; import { DxDropDownButtonComponent } from "devextreme-angular"; // ... export class AppComponent { @ViewChild("dropDownButtonVar", { static: false }) dropDownButton: DxDropDownButtonComponent; // Prior to Angular 8 // @ViewChild("dropDownButtonVar") dropDownButton: DxDropDownButtonComponent; removeDropDownButton (e) { this.dropDownButton.instance.dispose(); document.getElementById("myDropDownButton").remove(); } }
element()
An HTML element or a jQuery element when you use jQuery.
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endUpdate()
Refreshes the widget after a call of the beginUpdate() method.
Main article: beginUpdate()
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focus()
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getDataSource()
Gets the DataSource instance.
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- Data Layer - Overview
- Data Layer - DataSource Examples
getInstance(element)
getInstance is a static method that the widget class supports. The following code demonstrates how to get the DropDownButton instance found in an element with the myDropDownButton
ID:
// Modular approach import DropDownButton from "devextreme/ui/drop_down_button"; ... let element = document.getElementById("myDropDownButton"); let instance = DropDownButton.getInstance(element) as DropDownButton; // Non-modular approach let element = document.getElementById("myDropDownButton"); let instance = DevExpress.ui.dxDropDownButton.getInstance(element);
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instance()
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off(eventName)
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- Handle Events: Angular | Vue | React | jQuery | AngularJS | Knockout | ASP.NET MVC 5 | ASP.NET Core
off(eventName, eventHandler)
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- Handle Events: Angular | Vue | React | jQuery | AngularJS | Knockout | ASP.NET MVC 5 | ASP.NET Core
on(eventName, eventHandler)
Use this method to subscribe to one of the events listed in the Events section.
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- Handle Events: Angular | Vue | React | jQuery | AngularJS | Knockout | ASP.NET MVC 5 | ASP.NET Core
on(events)
Use this method to subscribe to several events with one method call. Available events are listed in the Events section.
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- Handle Events: Angular | Vue | React | jQuery | AngularJS | Knockout | ASP.NET MVC 5 | ASP.NET Core
open()
A Promise that is resolved when the drop-down menu is opened. It is a native Promise or a jQuery.Promise when you use jQuery.
option()
Gets all widget options.
See Also
- Get and Set Options
- Call Methods: Angular | Vue | React | jQuery | AngularJS | Knockout | ASP.NET MVC 5 | ASP.NET Core
option(optionName)
See Also
- Get and Set Options
- Call Methods: Angular | Vue | React | jQuery | AngularJS | Knockout | ASP.NET MVC 5 | ASP.NET Core
option(optionName, optionValue)
See Also
- Get and Set Options
- Call Methods: Angular | Vue | React | jQuery | AngularJS | Knockout | ASP.NET MVC 5 | ASP.NET Core
option(options)
See Also
- Get and Set Options
- Call Methods: Angular | Vue | React | jQuery | AngularJS | Knockout | ASP.NET MVC 5 | ASP.NET Core
registerKeyHandler(key, handler)
A handler. Accepts the keydown event as the argument. It is a dxEvent 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.
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repaint()
See Also
- reload() in DataSource | List
- refresh() in DataGrid | TreeList
- Call Methods: Angular | Vue | React | jQuery | AngularJS | Knockout | ASP.NET MVC 5 | ASP.NET Core
toggle()
A Promise that is resolved when the drop-down menu is opened or closed. It is a native Promise or a jQuery.Promise when you use jQuery.
toggle(visibility)
A Promise that is resolved when the drop-down menu is opened or closed. It is a native Promise or a jQuery.Promise when you use jQuery.
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