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Showing content from https://js.devexpress.com/Vue/Documentation/ApiReference/UI_Components/dxTextArea/Configuration/ below:

Vue TextArea Props | Vue Documentation

An object defining configuration properties for the TextArea UI component.

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

Selector: access-key

Default Value: undefined

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

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

Selector: active-state-enabled

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.

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

Selector: auto-resize-enabled

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.

Specifies whether the UI component responds to user interaction.

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

Selector: DxElementAttr

Default Value: {}

$(function(){
    $("#textAreaContainer").dxTextArea({
        // ...
        elementAttr: {
            id: "elementId",
            class: "class-name"
        }
    });
});

<dx-text-area ...
    [elementAttr]="{ id: 'elementId', class: 'class-name' }">
</dx-text-area>

import { DxTextAreaModule } from "devextreme-angular";
// ...
export class AppComponent {
    // ...
}
@NgModule({
    imports: [
        // ...
        DxTextAreaModule
    ],
    // ...
})

<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>

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;

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

Selector: focus-state-enabled

Default Value: true

Specifies the UI component's height.

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".

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.

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

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

Selector: hover-state-enabled

Default Value: true

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

Selector: input-attr

Type: any

Default Value: {}

$(function(){
    $("#textAreaContainer").dxTextArea({
        // ...
        inputAttr: {
            id: "inputId"
        }
    });
});

<dx-text-area ...
    [inputAttr]="{ id: 'inputId' }">
</dx-text-area>

import { DxTextAreaModule } from "devextreme-angular";
// ...
export class AppComponent {
    // ...
}
@NgModule({
    imports: [
        // ...
        DxTextAreaModule
    ],
    // ...
})

<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>

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}
        />
    );
}

@(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.

$(function(){
    $("#textAreaContainer").dxTextArea({
        // ...
        inputAttr: {
            'aria-label': 'your-label',
        },
    });
});

<dx-text-area ...
    [inputAttr]="{ 'aria-label': 'your-label' }">
</dx-text-area>

<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>

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.

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

Selector: is-dirty

Default Value: false

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

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

    $('#button').dxButton({
        // ...
        onClick () {
            if (textArea.option('isDirty')) {
                DevExpress.ui.notify("Do not forget to save changes", "warning", 500);
            }
        }
    });
});

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>

<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>

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;

• reset

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

Selector: is-valid

Default Value: true

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

Specifies the label's display mode.

Selector: label-mode

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

This property can have one of the following values:

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.

Specifies the maximum height of the UI component.

Selector: max-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".

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

Selector: max-length

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.

Specifies the minimum height of the UI component.

Selector: min-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".

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

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

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

Selector: @change

Information about the event.

Object structure:

Default Value: null

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

Selector: @content-ready

Information about the event.

Object structure:

Default Value: null

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

Selector: @copy

Information about the event.

Object structure:

Default Value: null

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

Selector: @cut

Information about the event.

Object structure:

Default Value: null

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

Selector: @disposing

Information about the event.

Object structure:

Default Value: null

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

Selector: @enter-key

Information about the event.

Object structure:

Default Value: null

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

Selector: @focus-in

Information about the event.

Object structure:

Default Value: null

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

Selector: @focus-out

Information about the event.

Object structure:

Default Value: null

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

Selector: @initialized

Information about the event.

Object structure:

Default Value: null

<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;
    }
}

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>

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>
        );
    }
}

• Get a UI component Instance in jQuery

• Get a UI component Instance in Angular

• Get a UI component Instance in Vue

• Get a UI component Instance in React

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

Selector: @input

Information about the event.

Object structure:

Default Value: null

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

Selector: @key-down

Information about the event.

Object structure:

Default Value: null

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

Selector: @key-up

Information about the event.

Object structure:

Default Value: null

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

Selector: @option-changed

Information about the event.

Object structure:

The modified property's new value.

The UI component's previous value.

String

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

String

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

HTMLElement | jQuery

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

TextArea

The UI component's instance.

Default Value: null

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

$(function() {
    $("#textAreaContainer").dxTextArea({
        // ...
        onOptionChanged: function(e) {
            if(e.name === "changedProperty") {
                // handle the property change here
            }
        }
    });
});

<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 { }  

<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> 

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}
        />        
    ); 
} 

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

Selector: @paste

Information about the event.

Object structure:

Default Value: null

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

Selector: @value-changed

Information about the event.

Object structure:

Default Value: null

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

Specifies whether the editor is read-only.

Selector: read-only

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

  $(function() {
      $("#textAreaContainer").dxTextArea({
          // ...
          buttons: [{
              name: "myCustomButton",
              location: "after",
              options: {
                  onClick: function(e) {
                      // ...
                  },
                  disabled: false
              }
          }]
      });
  });

  Angular

  <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

  <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

  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

  $(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

  <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

  <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

  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;

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

Selector: rtl-enabled

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.

DevExpress.config({
    rtlEnabled: true
});

DataGrid Demo Navigation UI Demo Editors Demo

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

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

Selector: styling-mode

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

The following styles are available:

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

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

Selector: tab-index

Default Value: 0

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

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

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

Selector: validation-error

Type: any

Default Value: null

An array of validation errors.

Selector: validation-errors

Default Value: null

TextArea updates this property automatically as it validates values. You can also update validationErrors manually to display custom errors and implement custom validation logic. The following code snippet demonstrates how to define items in this array:

$('#text-area').dxTextArea({
    isValid: false,
    validationErrors: [{ message: "Custom validation error" }],
})

<dx-text-area
    [isValid]="false"
    [validationErrors]="validationErrors"
></dx-text-area>

import { DxTextAreaComponent } from 'devextreme-angular/ui/text-area'

export class AppComponent {
    validationErrors = [
        { message: 'Custom validation error' }
    ];
}

<script setup lang="ts">
import { DxTextArea } from 'devextreme-vue/text-area';

const validationErrors = [
    { message: 'Custom validation error' }
];
</script>

<template>
    <DxTextArea 
        :is-valid="false"
        :validation-errors="validationErrors"
    />
</template>

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

const validationErrors = [
    { message: 'Custom validation error' }
];

function App(): JSX.Element {
    return (
        <TextArea
            isValid={false}
            validationErrors={validationErrors}
        />
    )
}

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

Selector: validation-message-mode

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.

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.

Selector: validation-message-position

Default Value: 'bottom'

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

$(function() {
    $("#textAreaContainer").dxTextArea({
        // ...
        validationMessagePosition: 'right'
    }).dxValidator({
        validationRules: [{
            type: 'required',
            message: 'Required',
        }],
    });
});

<dx-text-area ...
    validationMessagePosition="right">
    <dx-validator>
        <dxi-validation-rule
            type="required"
            message="Required"
        >
        </dxi-validation-rule>
    </dx-validator>
</dx-text-area>

<template>
    <DxTextArea ...
        validation-message-position="right"
    >
        <DxValidator>
            <DxRequiredRule message="Required" />
        </DxValidator>
    </DxTextArea>
</template>

<script>
    // ...
</script>

import React from 'react';
// ...

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

};
export default App;

Indicates or specifies the current validation status.

Selector: validation-status

Default Value: 'valid'

The following table illustrates the validation status indicators:

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

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

    function setInvalidStatus(message) {
        textArea.option({
            validationStatus: "invalid",
            validationErrors: [{ message: message }]
        });
    }
});

<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 }];
    }
}

<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>

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;

Specifies a value the UI component displays.

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

Selector: value-change-event

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.

• onValueChanged

Specifies whether the UI component is visible.

Specifies the UI component's width.

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".

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