JavaScript/jQuery TextArea Methods

This section describes the methods that control the TextArea UI component.

beginUpdate()

Prevents the UI component from refreshing until the endUpdate() method is called.

The beginUpdate() and endUpdate() methods prevent the UI component from excessive updates when you are changing multiple UI component settings at once. After the beginUpdate() method is called, the UI component does not update its UI until the endUpdate() method is called.

jQuery

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Angular

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Vue

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React

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blur()

Removes focus from the input element.

jQuery

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Vue

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React

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focus

defaultOptions(rule)

Specifies the device-dependent default configuration properties for this component.

Parameters:

rule:

Object

The component's default device properties.

Object structure:

Name	Type	Description
device	Device \| Array<Device> \| Function	Device parameters. When you specify a function, get information about the current device from the argument. Return true if the properties should be applied to the device.
options	Object	Options to be applied.

Name

Type

Description

device

Device

|

Array<Device>

|

Function

Device parameters.
When you specify a function, get information about the current device from the argument. Return true if the properties should be applied to the device.

options

Object

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 TextArea UI component in an application executed on the desktop.

jQuery

JavaScript

DevExpress.ui.dxTextArea.defaultOptions({ 
    device: { deviceType: "desktop" },
    options: {
        // Here go the TextArea properties
    }
});

Angular

TypeScript

import TextArea, { Properties } from "devextreme/ui/text_area";
// ...
export class AppComponent {
    constructor () {
        TextArea.defaultOptions<Properties>({
            device: { deviceType: "desktop" },
            options: {
                // Here go the TextArea properties
            }
        });
    }
}

Vue

<template>
    <div>
        <DxTextArea id="textArea1" />
        <DxTextArea id="textArea2" />
    </div>
</template>
<script>
import DxTextArea from "devextreme-vue/text-area";
import TextArea from "devextreme/ui/text_area";

TextArea.defaultOptions({
    device: { deviceType: "desktop" },
    options: {
        // Here go the TextArea properties
    }
});

export default {
    components: {
        DxTextArea
    }
}
</script>

React

import dxTextArea from "devextreme/ui/text_area";
import TextArea from "devextreme-react/text-area";

dxTextArea.defaultOptions({
    device: { deviceType: "desktop" },
    options: {
        // Here go the TextArea properties
    }
});

export default function App() {
    return (
        <div>
            <TextArea id="textArea1" />
            <TextArea id="textArea2" />
        </div>
    )
}

dispose()

Disposes of all the resources allocated to the TextArea instance.

jQuery

After calling this method, remove the DOM element associated with the UI component:

JavaScript

$("#myTextArea").dxTextArea("dispose");
$("#myTextArea").remove();

Angular

Use conditional rendering instead of this method:

app.component.html

<dx-text-area ...
    *ngIf="condition">
</dx-text-area>

Vue

Use conditional rendering instead of this method:

App.vue

<template>
    <DxTextArea ...
        v-if="condition">
    </DxTextArea>
</template>

<script>
import DxTextArea from 'devextreme-vue/text-area';

export default {
    components: {
        DxTextArea
    }
}
</script>

React

Use conditional rendering instead of this method:

App.js

import React from 'react';

import TextArea from 'devextreme-react/text-area';

function DxTextArea(props) {
    if (!props.shouldRender) {
        return null;
    }

    return (
        <TextArea ... >    
        </TextArea>
    );
}

class App extends React.Component {
    render() {
        return (
            <DxTextArea shouldRender="condition" />
        );
    }
}
export default App;

element()

Gets the root UI component element.

Return Value:

HTMLElement | jQuery

An HTML element or a jQuery element when you use jQuery.

jQuery

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Vue

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React

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endUpdate()

Refreshes the UI component after a call of the beginUpdate() method.

Main article: beginUpdate()

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Vue

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React

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focus()

Sets focus to the input element representing the UI component.

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getInstance(element)

Gets the instance of a UI component found using its DOM node.

Parameters:

element:

Element

|

jQuery

The UI component's container.

Return Value:

Object

The UI component's instance.

getInstance is a static method that the UI component 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);