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.
See Also
- Call Methods: jQuery | Angular | AngularJS | Knockout | ASP.NET MVC
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 TextArea widget in an application executed on the desktop.
jQuery
DevExpress.ui.dxTextArea.defaultOptions({ device: { deviceType: "desktop" }, options: { // Here go the TextArea options } });
Angular
import TextArea from 'devextreme/ui/text_area'; // ... export class AppComponent { constructor () { TextArea.defaultOptions({ device: { deviceType: "desktop" }, options: { // Here go the TextArea options } }); } }
dispose()
The following code disposes of an TextArea instance that corresponds to the element ID (or reference variable in Angular) and removes the element from the DOM:
jQuery
$("#myTextArea").dxTextArea("dispose"); $("#myTextArea").remove();
Angular
<dx-text-area #textAreaVar id="myTextArea"></dx-text-area>
import { ..., ViewChild } from "@angular/core"; import { DxTextAreaComponent } from "devextreme-angular"; // ... export class AppComponent { @ViewChild("textAreaVar") textArea: DxTextAreaComponent; removeTextArea (e) { this.textArea.instance.dispose(); document.getElementById("myTextArea").remove(); } }
endUpdate()
Refreshes the widget after a call of the beginUpdate() method.
Main article: beginUpdate()
See Also
- Call Methods: jQuery | Angular | AngularJS | Knockout | ASP.NET MVC
focus()
After that, the focus() method will work as follows.
See Also
- Call Methods: jQuery | Angular | AngularJS | Knockout | ASP.NET MVC
getInstance(element)
getInstance is a static method that the widget class supports. The following code demonstrates how to get the TextArea instance found in an element with the myTextArea
ID:
// Modular approach import TextArea from 'devextreme/ui/text_area'; ... let element = document.getElementById("myTextArea"); let instance = TextArea.getInstance(element) as TextArea; // Non-modular approach let element = document.getElementById("myTextArea"); let instance = DevExpress.ui.dxTextArea.getInstance(element);
See Also
registerKeyHandler(key, handler)
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
- Call Methods: jQuery | Angular | AngularJS | Knockout | ASP.NET MVC
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