Angular TextArea Properties

An object defining configuration properties for the TextArea UI component.

accessKey

Specifies the shortcut key that sets focus on the UI component.

Type:

String

Default Value: undefined

The value of this property will be passed to the accesskey attribute of the HTML element that underlies the UI component.

activeStateEnabled

Specifies whether the UI component changes its visual state as a result of user interaction.

Type:

Boolean

Default Value: false

The UI component switches to the active state when users press down the primary mouse button. When this property is set to true, the CSS rules for the active state apply. You can change these rules to customize the component.

Use this property when you display the component on a platform whose guidelines include the active state change for UI components.

autoResizeEnabled

A Boolean value specifying whether or not the auto resizing mode is enabled.

Type:

Boolean

Default Value: false

Use the minHeight and maxHeight properties to set the height that the adapted TextArea can occupy. minHeight specifies the initial height. For more information, refer to the following article: Resize TextArea.

Note that the height property is not in effect if autoResizeEnabled is set to true.

disabled

Specifies whether the UI component responds to user interaction.

Type:

Boolean

Default Value: false

elementAttr

Specifies the global attributes to be attached to the UI component's container element.

Selector: dxo-element-attr
Type:

Object

Default Value: {}

jQuery
$(function(){
    $("#textAreaContainer").dxTextArea({
        // ...
        elementAttr: {
            id: "elementId",
            class: "class-name"
        }
    });
});
Angular
HTML
TypeScript
<dx-text-area ...
    [elementAttr]="{ id: 'elementId', class: 'class-name' }">
</dx-text-area>
import { DxTextAreaModule } from "devextreme-angular";
// ...
export class AppComponent {
    // ...
}
@NgModule({
    imports: [
        // ...
        DxTextAreaModule
    ],
    // ...
})
Vue
App.vue
<template>
    <DxTextArea ...
        :element-attr="textAreaAttributes">
    </DxTextArea>
</template>

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

export default {
    components: {
        DxTextArea
    },
    data() {
        return {
            textAreaAttributes: {
                id: 'elementId',
                class: 'class-name'
            }
        }
    }
}
</script>
React
App.js
import React from 'react';

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

class App extends React.Component {
    textAreaAttributes = {
        id: 'elementId',
        class: 'class-name'
    }

    render() {
        return (
            <TextArea ...
                elementAttr={this.textAreaAttributes}>
            </TextArea>
        );
    }
}
export default App;

focusStateEnabled

Specifies whether the UI component can be focused using keyboard navigation.

Type:

Boolean

Default Value: true

height

Specifies the UI component's height.

Type:

Number

|

String

|

Function

Return Value:

Number

|

String

The UI component's height.

Default Value: undefined

This property accepts a value of one of the following types:

  • Number
    The height in pixels.

  • String
    A CSS-accepted measurement of height. For example, "55px", "20vh", "80%", "inherit".

  • Function (deprecated since v21.2)
    Refer to the W0017 warning description for information on how you can migrate to viewport units.

The TextArea can have a fixed or resizable height. Components with a fixed height displays a native scroll bar if the entered text exceeds the text area. You can customize this scroll bar only with CSS rules.

hint

Specifies text for a hint that appears when a user pauses on the UI component.

Type:

String

Default Value: undefined

hoverStateEnabled

Specifies whether the UI component changes its state when a user pauses on it.

Type:

Boolean

Default Value: true

inputAttr

Specifies the attributes to be passed on to the underlying HTML element.

Type: any
Default Value: {}

jQuery
$(function(){
    $("#textAreaContainer").dxTextArea({
        // ...
        inputAttr: {
            id: "inputId"
        }
    });
});
Angular
HTML
TypeScript
<dx-text-area ...
    [inputAttr]="{ id: 'inputId' }">
</dx-text-area>
import { DxTextAreaModule } from "devextreme-angular";
// ...
export class AppComponent {
    // ...
}
@NgModule({
    imports: [
        // ...
        DxTextAreaModule
    ],
    // ...
})
Vue
App.vue
<template>
    <DxTextArea
        :input-attr="inputAttr"
    />
</template>

<script>
import 'devextreme/dist/css/dx.light.css';

import DxTextArea from 'devextreme-vue/text-area';

export default {
    components: {
        DxTextArea
    },
    data() {
        return {
            inputAttr: { id: 'inputId' }
        }
    }
}
</script>
React
App.js
import 'devextreme/dist/css/dx.light.css';

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

const inputAttr = { id: 'inputId' };

export default function App() {
    return (
        <TextArea
            inputAttr={inputAttr}
        />
    );
}
ASP.NET MVC Controls
Razor C#
Razor VB
@(Html.DevExtreme().TextArea()
    .InputAttr("id", "inputId")
    // ===== or =====
    .InputAttr(new {
        @id = "inputId"
    })
    // ===== or =====
    .InputAttr(new Dictionary<string, object>() {
        { "id", "inputId" }
    })
)
@(Html.DevExtreme().TextArea() _
    .InputAttr("id", "inputId")
    ' ===== or =====
    .InputAttr(New With {
        .id = "inputId"
    })
    ' ===== or =====
    .InputAttr(New Dictionary(Of String, Object) From {
        { "id", "inputId" }
    })
)

To improve accessibility, use this property to specify aria-label for the component.

jQuery
index.js
$(function(){
    $("#textAreaContainer").dxTextArea({
        // ...
        inputAttr: {
            'aria-label': 'your-label',
        },
    });
});
Angular
app.component.html
<dx-text-area ...
    [inputAttr]="{ 'aria-label': 'your-label' }">
</dx-text-area>
Vue
App.vue
<template>
    <DxTextArea
        :input-attr="inputAttr"
    />
</template>

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

export default {
    components: {
        DxTextArea
    },
    data() {
        return {
            inputAttr: { 'aria-label': 'your-label' }
        }
    }
}
</script>
React
App.js
import TextArea from 'devextreme-react/text-area';

const inputAttr = { 'aria-label': 'your-label' };

export default function App() {
    return (
        <TextArea
            inputAttr={inputAttr}
        />
    );
}

You do not need to specify aria-label if you use label.

isDirty

Specifies whether the component's current value differs from the initial value.

Type:

Boolean

Default Value: false

This property is a read-only flag. You can use it to check if the editor value changed.

jQuery
index.js
$(() => {
    const textArea = $('#textArea').dxTextArea({
        // ...
    }).dxTextArea('instance');

    $('#button').dxButton({
        // ...
        onClick () {
            if (textArea.option('isDirty')) {
                DevExpress.ui.notify("Do not forget to save changes", "warning", 500);
            }
        }
    });
});
Angular
app.component.ts
app.component.html
import { Component, ViewChild } from '@angular/core';
import { DxTextAreaComponent, DxButtonModule } from 'devextreme-angular';
import notify from 'devextreme/ui/notify';

@Component({
    selector: 'app-root',
    templateUrl: './app.component.html',
    styleUrls: ['./app.component.css']
})
export class AppComponent {
    @ViewChild('textAreaRef', { static: false }) textArea: DxTextAreaComponent;

    onClick () {
        if (this.textArea.instance.option('isDirty')) {
            notify("Do not forget to save changes", "warning", 500);
        }
    }
}
<dx-text-area ... 
    #textAreaRef
>
</dx-text-area>
<dx-button ...
    (onClick)="onClick($event)"
>
</dx-button>
Vue
App.vue
<template>
    <DxTextArea ...
        :ref="textAreaRef"
    >
    </DxTextArea>
    <DxButton ...
        @click="onClick"
    />
</template>

<script>
import 'devextreme/dist/css/dx.light.css';
import DxTextArea from 'devextreme-vue/text-area';
import DxButton from 'devextreme-vue/button';
import notify from 'devextreme/ui/notify';

export default {
    components: {
        DxTextArea,
        DxButton
    },

    data() {
        return {
            textAreaRef
        }
    },

    methods: {
        onClick () {
            if (this.textArea.option('isDirty')) {
                notify("Do not forget to save changes", "warning", 500);
            }
        }
    },

    computed: {
        textArea: function() {
            return this.$refs[textAreaRef].instance;
        }
    }
}
</script>
React
App.js
import React, { useRef } from 'react';
import TextArea from 'devextreme-react/text-area';
import Button from 'devextreme-react/button';
import 'devextreme/dist/css/dx.light.css';

const App = () => {
    const textAreaRef = useRef(null);

    const onClick = () => {
        if (this.textAreaRef.current.instance().option('isDirty')) {
            notify("Do not forget to save changes", "warning", 500);
        }
    };

    return (
        <TextArea ...
            ref={textAreaRef}
        >
        </TextArea>
        <Button ...
            onClick={onClick}
        />
    );
};

export default App;
See Also

isValid

Specifies or indicates whether the editor's value is valid.

Type:

Boolean

Default Value: true

NOTE
When you use async rules, isValid is true if the status is "pending" or "valid".
See Also

label

Specifies a text string used to annotate the editor's value.

Type:

String

Default Value: ''

labelMode

Specifies the label's display mode.

Type:

LabelMode

Default Value: 'static', 'floating' (Material), 'outside' (Fluent)

This property can have one of the following values:

labelMode Description Illustration
"static" The label is displayed above the input field.
"floating" The label is used as a placeholder, but when the editor gets focus,
the label moves to the position above the input field.
"hidden" The label is hidden.
"outside" The label is outside.
NOTE

If autofill is enabled in the browser, we do not recommend that you use "floating" mode. The autofill values will overlap the label when it is displayed as a placeholder. Use "static" mode instead.

maxHeight

Specifies the maximum height of the UI component.

Type:

Number

|

String

Default Value: undefined

This property accepts a value of one of the following types:

  • Number
    The height in pixels.

  • String
    A CSS-accepted measurement of height. For example, "55px", "20vh", "80%", "inherit".

maxLength

Specifies the maximum number of characters you can enter into the textbox.

Type:

String

|

Number

Default Value: null

If the number of entered characters reaches the value assigned to this property, the UI component does not allow you to enter any more characters.

minHeight

Specifies the minimum height of the UI component.

Type:

Number

|

String

Default Value: undefined

This property accepts a value of one of the following types:

  • Number
    The height in pixels.

  • String
    A CSS-accepted measurement of height. For example, "55px", "20vh", "80%", "inherit".

name

The value to be assigned to the name attribute of the underlying HTML element.

Type:

String

Default Value: ''

Specify this property if the UI component lies within an HTML form that will be submitted.

onChange

A function that is executed when the UI component loses focus after the text field's content was changed using the keyboard.

Type:

Function

Function parameters:

Information about the event.

Object structure:
Name Type Description
event

Event (jQuery or EventObject)

The event that caused the function to execute. It is an EventObject or a jQuery.Event when you use jQuery.

element

HTMLElement | jQuery

The UI component's container. It is an HTML Element or a jQuery Element when you use jQuery.

component

TextArea

The UI component's instance.

Default Value: null

onContentReady

A function that is executed when the UI component is rendered and each time the component is repainted.

Type:

Function

Function parameters:

Information about the event.

Object structure:
Name Type Description
element

HTMLElement | jQuery

The UI component's container. It is an HTML Element or a jQuery Element when you use jQuery.

component

TextArea

The UI component's instance.

Default Value: null

onCopy

A function that is executed when the UI component's input has been copied.

Type:

Function

Function parameters:

Information about the event.

Object structure:
Name Type Description
event

Event (jQuery or EventObject)

The event that caused the function to execute. It is an EventObject or a jQuery.Event when you use jQuery.

element

HTMLElement | jQuery

The UI component's container. It is an HTML Element or a jQuery Element when you use jQuery.

component

TextArea

The UI component's instance.

Default Value: null

onCut

A function that is executed when the UI component's input has been cut.

Type:

Function

Function parameters:

Information about the event.

Object structure:
Name Type Description
event

Event (jQuery or EventObject)

The event that caused the function to execute. It is an EventObject or a jQuery.Event when you use jQuery.

element

HTMLElement | jQuery

The UI component's container. It is an HTML Element or a jQuery Element when you use jQuery.

component

TextArea

The UI component's instance.

Default Value: null

onDisposing

A function that is executed before the UI component is disposed of.

Type:

Function

Function parameters:

Information about the event.

Object structure:
Name Type Description
element

HTMLElement | jQuery

The UI component's container. It is an HTML Element or a jQuery Element when you use jQuery.

component

TextArea

The UI component's instance.

Default Value: null

onEnterKey

A function that is executed when the Enter key has been pressed while the UI component is focused.

Type:

Function

Function parameters:

Information about the event.

Object structure:
Name Type Description
event

Event (jQuery or EventObject)

The event that caused the function to execute. It is an EventObject or a jQuery.Event when you use jQuery.

element

HTMLElement | jQuery

The UI component's container. It is an HTML Element or a jQuery Element when you use jQuery.

component

TextArea

The UI component's instance.

Default Value: null

NOTE
This function is executed after the onKeyUp and onKeyDown functions.

onFocusIn

A function that is executed when the UI component gets focus.

Type:

Function

Function parameters:

Information about the event.

Object structure:
Name Type Description
event

Event (jQuery or EventObject)

The event that caused the function to execute. It is an EventObject or a jQuery.Event when you use jQuery.

element

HTMLElement | jQuery

The UI component's container. It is an HTML Element or a jQuery Element when you use jQuery.

component

TextArea

The UI component's instance.

Default Value: null

onFocusOut

A function that is executed when the UI component loses focus.

Type:

Function

Function parameters:

Information about the event.

Object structure:
Name Type Description
event

Event (jQuery or EventObject)

The event that caused the function to execute. It is an EventObject or a jQuery.Event when you use jQuery.

element

HTMLElement | jQuery

The UI component's container. It is an HTML Element or a jQuery Element when you use jQuery.

component

TextArea

The UI component's instance.

Default Value: null

onInitialized

A function used in JavaScript frameworks to save the UI component instance.

Type:

Function

Function parameters:

Information about the event.

Object structure:
Name Type Description
element

HTMLElement | jQuery

The UI component's container. It is an HTML Element or a jQuery Element when you use jQuery.

component

TextArea

The UI component's instance.

Default Value: null

Angular
app.component.html
app.component.ts
<dx-text-area ...
    (onInitialized)="saveInstance($event)">
</dx-text-area>
import { Component } from "@angular/core";
import TextArea from "devextreme/ui/data_grid";
// ...
export class AppComponent {
    textAreaInstance: TextArea;
    saveInstance (e) {
        this.textAreaInstance = e.component;
    }
}
Vue
App.vue (Options API)
App.vue (Composition API)
<template>
    <div>
        <DxTextArea ...
            @initialized="saveInstance">
        </DxTextArea>
    </div>
</template>

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

export default {
    components: {
        DxTextArea
    },
    data: function() {
        return {
            textAreaInstance: null
        };
    },
    methods: {
        saveInstance: function(e) {
            this.textAreaInstance = e.component;
        }
    }
};
</script>
<template>
    <div>
        <DxTextArea ...
            @initialized="saveInstance">
        </DxTextArea>
    </div>
</template>

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

let textAreaInstance = null;

const saveInstance = (e) => {
    textAreaInstance = e.component;
}
</script>
React
App.js
import TextArea from 'devextreme-react/text-area';

class App extends React.Component {
    constructor(props) {
        super(props);

        this.saveInstance = this.saveInstance.bind(this);
    }

    saveInstance(e) {
        this.textAreaInstance = e.component;
    }

    render() {
        return (
            <div>
                <TextArea onInitialized={this.saveInstance} />
            </div>
        );
    }
}
See Also
jQuery
  • Get a UI component Instance in jQuery
Angular
  • Get a UI component Instance in Angular
Vue
  • Get a UI component Instance in Vue
React
  • Get a UI component Instance in React

onInput

A function that is executed each time the UI component's input is changed while the UI component is focused.

Type:

Function

Function parameters:

Information about the event.

Object structure:
Name Type Description
event

Event (jQuery or EventObject)

The event that caused the function to execute. It is an EventObject or a jQuery.Event when you use jQuery.

element

HTMLElement | jQuery

The UI component's container. It is an HTML Element or a jQuery Element when you use jQuery.

component

TextArea

The UI component's instance.

Default Value: null

onKeyDown

A function that is executed when a user is pressing a key on the keyboard.

Type:

Function

Function parameters:

Information about the event.

Object structure:
Name Type Description
event

Event (jQuery or EventObject)

The event that caused the function to execute. It is an EventObject or a jQuery.Event when you use jQuery.

element

HTMLElement | jQuery

The UI component's container. It is an HTML Element or a jQuery Element when you use jQuery.

component

TextArea

The UI component's instance.

Default Value: null

onKeyUp

A function that is executed when a user releases a key on the keyboard.

Type:

Function

Function parameters:

Information about the event.

Object structure:
Name Type Description
event

Event (jQuery or EventObject)

The event that caused the function to execute. It is an EventObject or a jQuery.Event when you use jQuery.

element

HTMLElement | jQuery

The UI component's container. It is an HTML Element or a jQuery Element when you use jQuery.

component

TextArea

The UI component's instance.

Default Value: null

onOptionChanged

A function that is executed after a UI component property is changed.

Type:

Function

Function parameters:

Information about the event.

Object structure:
Name Type Description
value any

The modified property's new value.

previousValue any

The UI component's previous value.

name

String

The modified property if it belongs to the first level. Otherwise, the first-level property it is nested into.

fullName

String

The path to the modified property that includes all parent properties.

element

HTMLElement | jQuery

The UI component's container. It is an HTML Element or a jQuery Element when you use jQuery.

component

TextArea

The UI component's instance.

Default Value: null

The following example shows how to subscribe to component property changes:

jQuery
index.js
$(function() {
    $("#textAreaContainer").dxTextArea({
        // ...
        onOptionChanged: function(e) {
            if(e.name === "changedProperty") {
                // handle the property change here
            }
        }
    });
});
Angular
app.component.html
app.component.ts
app.module.ts
<dx-text-area ...
    (onOptionChanged)="handlePropertyChange($event)"> 
</dx-text-area>
import { Component } from '@angular/core'; 

@Component({ 
    selector: 'app-root', 
    templateUrl: './app.component.html', 
    styleUrls: ['./app.component.css'] 
}) 

export class AppComponent { 
    // ...
    handlePropertyChange(e) {
        if(e.name === "changedProperty") { 
            // handle the property change here
        }
    }
}
import { BrowserModule } from '@angular/platform-browser'; 
import { NgModule } from '@angular/core'; 
import { AppComponent } from './app.component'; 
import { DxTextAreaModule } from 'devextreme-angular'; 

@NgModule({ 
    declarations: [ 
        AppComponent 
    ], 
    imports: [ 
        BrowserModule, 
        DxTextAreaModule 
    ], 
    providers: [ ], 
    bootstrap: [AppComponent] 
}) 

export class AppModule { }  
Vue
App.vue
<template> 
    <DxTextArea ...
        @option-changed="handlePropertyChange"
    />            
</template> 

<script>  
import 'devextreme/dist/css/dx.light.css'; 
import DxTextArea from 'devextreme-vue/text-area'; 

export default { 
    components: { 
        DxTextArea
    }, 
    // ...
    methods: { 
        handlePropertyChange: function(e) {
            if(e.name === "changedProperty") {
                // handle the property change here
            }
        }
    } 
} 
</script> 
React
App.js
import React from 'react';  
import 'devextreme/dist/css/dx.light.css'; 

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

const handlePropertyChange = (e) => {
    if(e.name === "changedProperty") {
        // handle the property change here
    }
}

export default function App() { 
    return ( 
        <TextArea ...
            onOptionChanged={handlePropertyChange}
        />        
    ); 
} 

onPaste

A function that is executed when the UI component's input has been pasted.

Type:

Function

Function parameters:

Information about the event.

Object structure:
Name Type Description
event

Event (jQuery or EventObject)

The event that caused the function to execute. It is an EventObject or a jQuery.Event when you use jQuery.

element

HTMLElement | jQuery

The UI component's container. It is an HTML Element or a jQuery Element when you use jQuery.

component

TextArea

The UI component's instance.

Default Value: null

onValueChanged

A function that is executed after the UI component's value is changed.

Type:

Function

Function parameters:

Information about the event.

Object structure:
Name Type Description
value

Object

The UI component's new value.

previousValue

Object

The UI component's previous value.

event

Event (jQuery or EventObject)

The event that caused the function to execute. It is an EventObject or a jQuery.Event when you use jQuery. This field is undefined if the value is changed programmatically.

element

HTMLElement | jQuery

The UI component's container. It is an HTML Element or a jQuery Element when you use jQuery.

component

TextArea

The UI component's instance.

Default Value: null

placeholder

Specifies a text string displayed when the editor's value is empty.

Type:

String

Default Value: ''

See Also

readOnly

Specifies whether the editor is read-only.

Type:

Boolean

Default Value: false

When this property is set to true, the following applies:

  • The editor's value cannot be changed using the UI.
  • Built-in action buttons are invisible.
  • Custom action buttons are visible but disabled. If a button should not be disabled, set its disabled property to false:

    jQuery
    index.js
    $(function() {
        $("#textAreaContainer").dxTextArea({
            // ...
            buttons: [{
                name: "myCustomButton",
                location: "after",
                options: {
                    onClick: function(e) {
                        // ...
                    },
                    disabled: false
                }
            }]
        });
    });
    Angular
    app.component.html
    app.component.ts
    app.module.ts
    <dx-text-area ... >
        <dxi-button
            name="myCustomButton"
            location="after"
            [options]="myCustomButtonConfig">
        </dxi-button>
    </dx-text-area>
    import { Component } from '@angular/core';
    
    @Component({
        selector: 'app-root',
        templateUrl: './app.component.html',
        styleUrls: ['./app.component.css']
    })
    export class AppComponent {
        myCustomButtonConfig = {
            onClick: (e) => {
                // ...
            },
            disabled: false
        };
    }
    import { BrowserModule } from '@angular/platform-browser';
    import { NgModule } from '@angular/core';
    import { AppComponent } from './app.component';
    
    import { DxTextAreaModule } from 'devextreme-angular';
    
    @NgModule({
        declarations: [
            AppComponent
        ],
        imports: [
            BrowserModule,
            DxTextAreaModule
        ],
        providers: [ ],
        bootstrap: [AppComponent]
    })
    export class AppModule { }
    Vue
    App.vue
    <template>
        <DxTextArea ... >
            <DxTextAreaButton
                name="myCustomButton"
                location="after"
                :options="myCustomButtonConfig"
            />
        </DxTextArea>
    </template>
    
    <script>
    import 'devextreme/dist/css/dx.light.css';
    
    import DxTextArea, {
        DxButton as DxTextAreaButton
    } from 'devextreme-vue/text-area';
    
    export default {
        components: {
            DxTextArea,
            DxTextAreaButton
        },
        data() {
            return {
                myCustomButtonConfig: {
                    onClick: (e) => {
                        // ...
                    },
                    disabled: false
                }
            }
        }
    }
    </script>
    React
    App.js
    import React from 'react';
    
    import 'devextreme/dist/css/dx.light.css';
    
    import TextArea, {
        Button as TextAreaButton
    } from 'devextreme-react/text-area';
    
    class App extends React.Component {
        myCustomButtonConfig = {
            onClick: (e) => {
                // ...
            },
            disabled: false
        };
        render() {
            return (
                <TextArea>
                    <TextAreaButton
                        name="myCustomButton"
                        location="after"
                        options={this.myCustomButtonConfig}
                    />
                </TextArea>
            );
        }
    }
    export default App;

    You can also hide a custom action button when the UI component becomes read-only. Set the button's visible property to false in the onOptionChanged function. To get the button, use the getButton(name) method:

    jQuery
    index.js
    $(function() {
        $("#textAreaContainer").dxTextArea({
            // ...
            buttons: [{
                name: "myCustomButton",
                // ...
            }],
            onOptionChanged: function(e) {
                if(e.name == "readOnly") {
                    const myButton = e.component.getButton("myCustomButton");
                    myButton.option("visible", !e.value); // Hide the button when readOnly: true
                }
            }
        });
    });
    Angular
    app.component.html
    app.component.ts
    app.module.ts
    <dx-text-area ...
        (onOptionChanged)="changeButtonState">
        <dxi-button
            name="myCustomButton"
            ...
        ></dxi-button>
    </dx-text-area>
    import { Component } from '@angular/core';
    
    @Component({
        selector: 'app-root',
        templateUrl: './app.component.html',
        styleUrls: ['./app.component.css']
    })
    export class AppComponent {
        changeButtonState(e) {
            if(e.name == 'readOnly') {
                let myButton = e.component.getButton('myCustomButton');
                myButton.option('visible', !e.value); // Hide the button when readOnly: true
            }
        }
    }
    import { BrowserModule } from '@angular/platform-browser';
    import { NgModule } from '@angular/core';
    import { AppComponent } from './app.component';
    
    import { DxTextAreaModule } from 'devextreme-angular';
    
    @NgModule({
        declarations: [
            AppComponent
        ],
        imports: [
            BrowserModule,
            DxTextAreaModule
        ],
        providers: [ ],
        bootstrap: [AppComponent]
    })
    export class AppModule { }
    Vue
    App.vue
    <template>
        <DxTextArea ...
            @option-changed="changeButtonState">
            <DxTextAreaButton
                name="myCustomButton"
                ...
            />
        </DxTextArea>
    </template>
    
    <script>
    import 'devextreme/dist/css/dx.light.css';
    
    import DxTextArea, {
        DxButton as DxTextAreaButton
    } from 'devextreme-vue/text-area';
    
    export default {
        components: {
            DxTextArea,
            DxTextAreaButton
        },
        data() {
            return {
                // ...
            }
        },
        methods: {
            changeButtonState(e) {
                if(e.name == 'readOnly') {
                    let myButton = e.component.getButton('myCustomButton');
                    myButton.option('visible', !e.value); // Hide the button when readOnly: true
                }
            }
        }
    }
    </script>
    React
    App.js
    import React from 'react';
    
    import 'devextreme/dist/css/dx.light.css';
    
    import TextArea, {
        Button as TextAreaButton
    } from 'devextreme-react/text-area';
    
    class App extends React.Component {
        changeButtonState(e) {
            if(e.name == 'readOnly') {
                let myButton = e.component.getButton('myCustomButton');
                myButton.option('visible', !e.value); // Hide the button when readOnly: true
            }
        }
        render() {
            return (
                <TextArea ...
                    onOptionChanged={this.changeButtonState}>
                    <TextAreaButton
                        name="myCustomButton"
                        ...
                    />
                </TextArea>
            );
        }
    }
    export default App;

rtlEnabled

Switches the UI component to a right-to-left representation.

Type:

Boolean

Default Value: false

When this property is set to true, the UI component text flows from right to left, and the layout of elements is reversed. To switch the entire application/site to the right-to-left representation, assign true to the rtlEnabled field of the object passed to the DevExpress.config(config) method.

JavaScript
DevExpress.config({
    rtlEnabled: true
});

DataGrid Demo Navigation UI Demo Editors Demo

spellcheck

Specifies whether or not the UI component checks the inner text for spelling mistakes.

Type:

Boolean

Default Value: true

stylingMode

Specifies how the UI component's text field is styled.

Type:

EditorStyle

Default Value: 'outlined', 'filled' (Material)

The following styles are available:

Text Editor Styling Modes

You can also use the global editorStylingMode setting to specify how the text fields of all editors in your application are styled.

tabIndex

Specifies the number of the element when the Tab key is used for navigating.

Type:

Number

Default Value: 0

The value of this property will be passed to the tabindex attribute of the HTML element that underlies the UI component.

text

The read-only property that holds the text displayed by the UI component input element.

Type:

String

Read-only

validationError

Information on the broken validation rule. Contains the first item from the validationErrors array.

Type: any
Default Value: null

See Also

validationErrors

An array of the validation rules that failed.

Type:

Array<any>

Default Value: null

validationMessageMode

Specifies how the message about the validation rules that are not satisfied by this editor's value is displayed.

Default Value: 'auto'

The following property values are possible:

  • auto
    The tooltip with the message is displayed when the editor is in focus.
  • always
    The tooltip with the message is not hidden when the editor loses focus.

validationMessagePosition

Specifies the position of a validation message relative to the component. The validation message describes the validation rules that this component's value does not satisfy.

Type:

Position

Default Value: 'bottom'

The following example positions a validation message at the component's right:

jQuery
index.js
$(function() {
    $("#textAreaContainer").dxTextArea({
        // ...
        validationMessagePosition: 'right'
    }).dxValidator({
        validationRules: [{
            type: 'required',
            message: 'Required',
        }],
    });
});
Angular
app.component.html
<dx-text-area ...
    validationMessagePosition="right">
    <dx-validator>
        <dxi-validation-rule
            type="required"
            message="Required"
        >
        </dxi-validation-rule>
    </dx-validator>
</dx-text-area>
Vue
App.vue
<template>
    <DxTextArea ...
        validation-message-position="right"
    >
        <DxValidator>
            <DxRequiredRule message="Required" />
        </DxValidator>
    </DxTextArea>
</template>

<script>
    // ...
</script>
React
App.js
import React from 'react';
// ...

function App() {
    return (
        <TextArea ...
            validationMessagePosition="right"
        >
            <Validator>
                <RequiredRule message="Required" />
            </Validator>
        </TextArea>
    ); 

};
export default App;

validationStatus

Indicates or specifies the current validation status.

Default Value: 'valid'

The following table illustrates the validation status indicators:

validationStatus Indicator
"pending" DevExtreme editor validation status: pending
"valid" DevExtreme editor validation status: valid
"invalid" DevExtreme editor validation status: invalid

When you assign "invalid" to validationStatus, you can also use the validationErrors array to set an error message as shown below:

jQuery
index.js
$(function() {
    const textArea = $("#textAreaContainer").dxTextArea({
        // ...
    }).dxTextArea("instance");

    function setInvalidStatus(message) {
        textArea.option({
            validationStatus: "invalid",
            validationErrors: [{ message: message }]
        });
    }
});
Angular
app.component.html
app.component.ts
<dx-text-area
    [validationStatus]="validationStatus"
    [validationErrors]="validationErrors">
</dx-text-area>
// ...
export class AppComponent {
    validationStatus: string = "valid";
    validationErrors: any;
    // ...
    setInvalidStatus(message) {
        this.validationStatus = "invalid";
        this.validationErrors = [{ message: message }];
    }
}
Vue
App.vue
<template>
    <DxTextArea ...
        :validation-status="validationStatus"
        :validation-errors="validationErrors"
    />
</template>

<script>
    // ...
    export default {
        // ...
        data() {
            return {
                validationStatus: "valid",
                validationErrors: []
            }
        },
        methods: {
            setInvalidStatus(message) {
                this.validationStatus = "invalid";
                this.validationErrors = [{ message: message }];
            }
        }
    }
</script>
React
App.js
import React, { useState } from 'react';
// ...

function App() {
    const [validationStatus, setValidationStatus] = useState("valid");
    const [validationErrors, setValidationErrors] = useState([]);

    const setInvalidStatus = message => {
        setValidationStatus("invalid");
        setValidationErrors([{ message: message }]);
    }

    return (
        <TextArea
            validationStatus={validationStatus}
            validationErrors={validationErrors}
        />
    ); 

};
export default App;

value

Specifies a value the UI component displays.

Type:

String

Default Value: ''
Raised Events: onValueChanged

See Also

valueChangeEvent

Specifies the DOM events after which the UI component's value should be updated.

Type:

String

Default Value: 'change'

This property accepts a single event name or several names separated by spaces.

The recommended events are "keyup", "blur", "change", "input", and "focusout", but you can use other events as well.

See Also

visible

Specifies whether the UI component is visible.

Type:

Boolean

Default Value: true

width

Specifies the UI component's width.

Type:

Number

|

String

|

Function

Return Value:

Number

|

String

The UI component's width.

Default Value: undefined

This property accepts a value of one of the following types:

  • Number
    The width in pixels.

  • String
    A CSS-accepted measurement of width. For example, "55px", "20vw", "80%", "auto", "inherit".

  • Function (deprecated since v21.2)
    Refer to the W0017 warning description for information on how you can migrate to viewport units.