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

Vue HtmlEditor Props | Vue Documentation

This section describes properties that configure the HtmlEditor UI component's contents, behavior, and appearance.

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.

Binds the AI service to the HTML Editor.

Selector: DxAiIntegration

Default Value: undefined

To activate AI functionality in HTML Editor, specify:

jQuery 
const aiIntegration = new DevExpress.aiIntegration(provider);

$("#htmlEditor").dxHtmlEditor({
    // ...
    aiIntegration,
    toolbar: {
        items: [
            {
                name: 'ai',
                commands: [
                    'summarize',
                    'translate',
                    'askAI',
                ],
            },
        ],
    }
});
<head>
    <!-- ... -->
    <script type="text/javascript" src="../artifacts/js/dx.ai-integration.js" charset="utf-8"></script>
    <!-- or if using CDN -->
    <script src="https://cdnjs.cloudflare.com/ajax/libs/devextreme-dist/25.1.4/js/dx.ai-integration.js"></script>
</head>
Angular 
import { AIIntegration } from 'devextreme-angular/common/ai-integration';
import { AICommand } from 'devextreme/ui/html_editor';
// ...
export class AppComponent {
    aiIntegration = new AIIntegration(provider);
    const commands: Array<AICommand> = [
        'summarize',
        'translate',
        'askAI',
    ];
}
<dx-html-editor [aiIntegration]="aiIntegration">
    <dxo-toolbar>
        <dxi-item name="ai" [commands]="commands"></dxi-item>
    </dxo-toolbar>
</dx-html-editor>
Vue 
<template>
    <DxHtmlEditor :ai-integration="aiIntegration">
        <DxToolbar>
            <DxItem
                name="ai"
                :commands="commands"
            />
        </DxToolbar>
    </DxHtmlEditor>
</template>

<script setup lang="ts">
import {
    DxHtmlEditor,
    DxToolbar,
    DxItem,
} from 'devextreme-vue/html-editor';
import { AIIntegration } from 'devextreme-vue/common/ai-integration';

const aiIntegration = new AIIntegration(provider);
const commands = [
    'summarize',
    'translate',
    'askAI',
];
</script>
React 
import React from 'react';
import HtmlEditor, {
    Toolbar,
    Item,
} from 'devextreme-react/html-editor';
import { AIIntegration } from 'devextreme-react/common/ai-integration';
import { AICommand } from 'devextreme/ui/html_editor';

const aiIntegration = new AIIntegration(provider);
const commands: Array<AICommand> = [
    'summarize',
    'translate',
    'askAI',
];

const App = () => {
    return (
        <HtmlEditor aiIntegration={aiIntegration}>
            <Toolbar>
                <Item name="ai" commands={commands} />
            </Toolbar>
        </HtmlEditor>
    );
}

Allows users to break content into multiple lines within a single block element. The Shift + Enter key combination generates the new line.

Selector: allow-soft-line-break

Default Value: false

Allows you to convert an HTML Editor value between different markups.

Selector: DxConverter

Default Value: undefined

jQuery 
const converter = {
    toHtml: (value) => {
        const result = */ Convert the value and return a string */
        return result;
    },

    fromHtml: (value) => {
        const result = /* Convert the value and return a string */
        return result;
    }
    }

$('#editor').dxHtmlEditor({
    converter,
});
Angular 
export class AppComponent {
    toHtml(value) {
        const result = */ Convert the value and return a string */
        return result;
    }

    fromHtml(value) {
        const result = /* Convert the value and return a string */
        return result;
    }
}
<dx-html-editor>
    <dxo-converter
        (toHtml)="toHtml"
        (fromHtml)="fromHtml"
    >
    </dxo-converter>
</dx-html-editor>
Vue 
<template>
    <DxHtmlEditor ...>
        <DxConverter
            @to-html="toHtml"
            @from-html="fromHtml"
        />
    </DxHtmlEditor>
</template>

<script setup>
import DxHtmlEditor, { DxConverter } from 'devextreme-vue/html-editor';

const toHtml: (value) => {
    const result = */ Convert the value and return a string */
    return result;
}

const fromHtml: (value) => {
    const result = /* Convert the value and return a string */
    return result;
}
</script>
React 
import React from 'react';
import HtmlEditor, { Converter } from 'devextreme-react/html-editor';

const toHtml: (value) => {
    const result = */ Convert the value and return a string */
    return result;
}

const fromHtml: (value) => {
    const result = /* Convert the value and return a string */
    return result;
}

function App() {
    return (
        <HtmlEditor ...>
            <Converter
                fromHtml={fromHtml}
                toHtml={toHtml}
            />
        </HtmlEditor>
    );
}

export default App;

View Demo

Allows you to customize the DevExtreme Quill and 3rd-party modules.

Selector: customize-modules

The DevExtreme Quill modules and the API you can use to customize them are described in the Modules documentation section. For example, the History module, which handles the undo and redo operations, can be customized as follows:

jQuery 
$(function() {
    $("#htmlEditorContainer").dxHtmlEditor({
        // ...
        customizeModules: function(config) {
            config.history = {
                delay: 0,
                maxStack: 5000
            }; 
        }
    });
});
Angular 
<dx-html-editor ...
    [customizeModules]="customizeQuillModules">
</dx-html-editor>
import { Component } from '@angular/core';

@Component({
    selector: 'app-root',
    templateUrl: './app.component.html',
    styleUrls: ['./app.component.css']
})
export class AppComponent {
    customizeQuillModules(config) {
        config.history = {
            delay: 0,
            maxStack: 5000
        }; 
    }
}
import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { AppComponent } from './app.component';

import { DxHtmlEditorModule } from 'devextreme-angular';
@NgModule({
    declarations: [
        AppComponent
    ],
    imports: [
        BrowserModule,
        DxHtmlEditorModule
    ],
    providers: [ ],
    bootstrap: [AppComponent]
})
export class AppModule { }
Vue 
<template>
    <DxHtmlEditor ...
        :customize-modules="customizeQuillModules"
    />
</template>

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

import DxHtmlEditor from 'devextreme-vue/html-editor';

export default {
    components: {
        DxHtmlEditor
    },
    methods: {
        customizeQuillModules(config) {
            config.history = {
                delay: 0,
                maxStack: 5000
            }; 
        }
    }
}
</script>
React 
import React from 'react';

import 'devextreme/dist/css/dx.light.css';

import HtmlEditor from 'devextreme-react/html-editor';

class App extends React.Component {
    render() {
        return (
            <HtmlEditor ...
                customizeModules={this.customizeQuillModules}
            />
        );
    }
    customizeQuillModules(config) {
        config.history = {
            delay: 0,
            maxStack: 5000
        }; 
    }
}
export default App;

If 3rd-party modules are used in the HTML Editor, refer to their documentation for information on the API.

See Also

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: {}

jQuery 
$(function(){
    $("#htmlEditorContainer").dxHtmlEditor({
        // ...
        elementAttr: {
            id: "elementId",
            class: "class-name"
        }
    });
});
Angular 
<dx-html-editor ...
    [elementAttr]="{ id: 'elementId', class: 'class-name' }">
</dx-html-editor>
import { DxHtmlEditorModule } from "devextreme-angular";
// ...
export class AppComponent {
    // ...
}
@NgModule({
    imports: [
        // ...
        DxHtmlEditorModule
    ],
    // ...
})
Vue 
<template>
    <DxHtmlEditor ...
        :element-attr="htmlEditorAttributes">
    </DxHtmlEditor>
</template>

<script>
import DxHtmlEditor from 'devextreme-vue/html-editor';

export default {
    components: {
        DxHtmlEditor
    },
    data() {
        return {
            htmlEditorAttributes: {
                id: 'elementId',
                class: 'class-name'
            }
        }
    }
}
</script>
React 
import React from 'react';

import HtmlEditor from 'devextreme-react/html-editor';

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

    render() {
        return (
            <HtmlEditor ...
                elementAttr={this.htmlEditorAttributes}>
            </HtmlEditor>
        );
    }
}
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:

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: false

Configures the image upload.

Selector: DxImageUpload

Default Value: { tabs: ['url'], fileUploadMode: 'base64', uploadUrl: undefined, uploadDirectory: undefined }

View Demo View on GitHub

Click the 'Add Image' toolbar button to invoke the 'Add an Image' dialog.

Use the fileUploadMode property to specify whether to upload images as is or in Base64 binary format. The tabs property specifies the visibility of tabs in the 'Add Image' dialog.

If

fileUploadMode

is set to

server

or

both

, specify

uploadDirectory

to correctly upload images. If your application does not include a shared folder, check the "Encode to Base64" check box to display an uploaded image as a

base64

string.

jQuery 
$(function() {
    $("#htmlEditorContainer").dxHtmlEditor({
        // ...
        imageUpload: {
            fileUploadMode: 'both',
            tabs: ['url', 'file'],
            uploadUrl: 'https://js.devexpress.com/Demos/Upload'
            uploadDirectory: '/Images'
        }
    });
});
Angular 
<dx-html-editor ...>
    <dxo-image-upload
        fileUploadMode="both"
        [tabs]="['url', 'file']"
        uploadUrl="https://js.devexpress.com/Demos/Upload"
        uploadDirectory="/Images">
    </dxo-image-upload>
</dx-html-editor>
import { Component } from '@angular/core';

@Component({
    selector: 'app-root',
    templateUrl: './app.component.html',
    styleUrls: ['./app.component.css']
})
import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { AppComponent } from './app.component';

import { DxHtmlEditorModule } from 'devextreme-angular';
@NgModule({
    declarations: [
        AppComponent
    ],
    imports: [
        BrowserModule,
        DxHtmlEditorModule
    ],
    providers: [ ],
    bootstrap: [AppComponent]
})
export class AppModule { }
Vue 
<template>
    <DxHtmlEditor ...>
        <DxImageUpload
            fileUploadMode="both"
            :tabs="dialogTabs"
            uploadUrl="https://js.devexpress.com/Demos/Upload"
            uploadDirectory="/Images"
         />
    </DxHtmlEditor>
</template>

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

import DxHtmlEditor from 'devextreme-vue/html-editor';

export default {
    components: {
        DxHtmlEditor
    },
    methods: {
        // ...
    },
    data() {
        return {
            dialogTabs: ['url', 'file']
        };
    }         
}
</script>
React 
import React from 'react';

import 'devextreme/dist/css/dx.light.css';

import HtmlEditor from 'devextreme-react/html-editor';

const dialogTabs = ['url', 'file'];

class App extends React.Component {
    render() {
        return (
            <HtmlEditor ...>
                <ImageUpload 
                    fileUploadMode="both"
                    :tabs={dialogTabs}
                    uploadUrl="https://js.devexpress.com/Demos/Upload"
                    uploadDirectory="/Images"
                />
            </HtmlEditor>
        );
    }
}
export default App;

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.

jQuery 
$(() => {
    const htmlEditor = $('#htmlEditor').dxHtmlEditor({
        // ...
    }).dxHtmlEditor('instance');

    $('#button').dxButton({
        // ...
        onClick () {
            if (htmlEditor.option('isDirty')) {
                DevExpress.ui.notify("Do not forget to save changes", "warning", 500);
            }
        }
    });
});
Angular 
import { Component, ViewChild } from '@angular/core';
import { DxHtmlEditorComponent, 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('htmlEditorRef', { static: false }) htmlEditor: DxHtmlEditorComponent;

    onClick () {
        if (this.htmlEditor.instance.option('isDirty')) {
            notify("Do not forget to save changes", "warning", 500);
        }
    }
}
<dx-html-editor ... 
    #htmlEditorRef
>
</dx-html-editor>
<dx-button ...
    (onClick)="onClick($event)"
>
</dx-button>
Vue 
<template>
    <DxHtmlEditor ...
        :ref="htmlEditorRef"
    >
    </DxHtmlEditor>
    <DxButton ...
        @click="onClick"
    />
</template>

<script>
import 'devextreme/dist/css/dx.light.css';
import DxHtmlEditor from 'devextreme-vue/html-editor';
import DxButton from 'devextreme-vue/button';
import notify from 'devextreme/ui/notify';

export default {
    components: {
        DxHtmlEditor,
        DxButton
    },

    data() {
        return {
            htmlEditorRef
        }
    },

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

    computed: {
        htmlEditor: function() {
            return this.$refs[htmlEditorRef].instance;
        }
    }
}
</script>
React 
import React, { useRef } from 'react';
import HtmlEditor from 'devextreme-react/html-editor';
import Button from 'devextreme-react/button';
import 'devextreme/dist/css/dx.light.css';

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

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

    return (
        <HtmlEditor ...
            ref={htmlEditorRef}
        >
        </HtmlEditor>
        <Button ...
            onClick={onClick}
        />
    );
};

export default App;
See Also

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

Selector: is-valid

Default Value: true

Configures media resizing.

Selector: DxMediaResizing

Default Value: null

View Demo

Configures mentions.

Selector: DxMention

Default Value: null

View Demo

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 is rendered and each time the component is repainted.

Selector: @content-ready

Function parameters:

Information about the event.

Object structure:

Default Value: null

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

Selector: @disposing

Function parameters:

Information about the event.

Object structure:

Default Value: null

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

Selector: @focus-in

Function parameters:

Information about the event that caused the function execution.

Object structure:

Default Value: null

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

Selector: @focus-out

Function parameters:

Information about the event that caused the function execution.

Object structure:

Default Value: null

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

Selector: @initialized

Function parameters:

Information about the event.

Object structure:

Default Value: null

Angular 
<dx-html-editor ...
    (onInitialized)="saveInstance($event)">
</dx-html-editor>
import { Component } from "@angular/core";
import HtmlEditor from "devextreme/ui/data_grid";
// ...
export class AppComponent {
    htmlEditorInstance: HtmlEditor;
    saveInstance (e) {
        this.htmlEditorInstance = e.component;
    }
}
Vue

App.vue (Composition API)

<template>
    <div>
        <DxHtmlEditor ...
            @initialized="saveInstance">
        </DxHtmlEditor>
    </div>
</template>

<script>
import DxHtmlEditor from 'devextreme-vue/html-editor';

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

<script setup>
import DxHtmlEditor from 'devextreme-vue/html-editor';

let htmlEditorInstance = null;

const saveInstance = (e) => {
    htmlEditorInstance = e.component;
}
</script>
React 
import HtmlEditor from 'devextreme-react/html-editor';

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

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

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

    render() {
        return (
            <div>
                <HtmlEditor onInitialized={this.saveInstance} />
            </div>
        );
    }
}
See Also jQuery Angular Vue React

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

Selector: @option-changed

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

HtmlEditor

The UI component's instance.

Default Value: null

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

jQuery 
$(function() {
    $("#htmlEditorContainer").dxHtmlEditor({
        // ...
        onOptionChanged: function(e) {
            if(e.name === "changedProperty") {
                // handle the property change here
            }
        }
    });
});
Angular 
<dx-html-editor ...
    (onOptionChanged)="handlePropertyChange($event)"> 
</dx-html-editor>
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 { DxHtmlEditorModule } from 'devextreme-angular'; 

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

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

<script>  
import 'devextreme/dist/css/dx.light.css'; 
import DxHtmlEditor from 'devextreme-vue/html-editor'; 

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

import HtmlEditor from 'devextreme-react/html-editor'; 

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

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

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

Selector: @value-changed

Function parameters:

Information about the event.

Object structure:

Default Value: null

Specifies the text displayed when the input field is empty.

Specifies whether the editor is read-only.

Selector: read-only

Default Value: false

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 how the HTML Editor's toolbar and content field are styled.

Selector: styling-mode

Default Value: 'outlined'

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.

Configures table context menu settings.

Selector: DxTableContextMenu

Default Value: null

Table cells include a context menu with common table operation commands. To activate it, set the enabled property to true.

You can also use the items array to rearrange or hide menu commands.

Configures table resize.

Selector: DxTableResizing

Default Value: null

Configures the UI component's toolbar.

Selector: DxToolbar

Default Value: null

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

HtmlEditor 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:

jQuery 
$('#html-editor').dxHtmlEditor({
    isValid: false,
    validationErrors: [{ message: "Custom validation error" }],
})
Angular 
<dx-html-editor
    [isValid]="false"
    [validationErrors]="validationErrors"
></dx-html-editor>
import { DxHtmlEditorComponent } from 'devextreme-angular/ui/html-editor'

export class AppComponent {
    validationErrors = [
        { message: 'Custom validation error' }
    ];
}
Vue 
<script setup lang="ts">
import { DxHtmlEditor } from 'devextreme-vue/html-editor';

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

<template>
    <DxHtmlEditor 
        :is-valid="false"
        :validation-errors="validationErrors"
    />
</template>
React 
import { HtmlEditor } from 'devextreme-react/html-editor';

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

function App(): JSX.Element {
    return (
        <HtmlEditor
            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:

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:

jQuery 
$(function() {
    $("#htmlEditorContainer").dxHtmlEditor({
        // ...
        validationMessagePosition: 'right'
    }).dxValidator({
        validationRules: [{
            type: 'required',
            message: 'Required',
        }],
    });
});
Angular 
<dx-html-editor ...
    validationMessagePosition="right">
    <dx-validator>
        <dxi-validation-rule
            type="required"
            message="Required"
        >
        </dxi-validation-rule>
    </dx-validator>
</dx-html-editor>
Vue 
<template>
    <DxHtmlEditor ...
        validation-message-position="right"
    >
        <DxValidator>
            <DxRequiredRule message="Required" />
        </DxValidator>
    </DxHtmlEditor>
</template>

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

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

};
export default App;

Indicates or specifies the current validation status.

Selector: validation-status

Default Value: 'valid'

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

jQuery 
$(function() {
    const htmlEditor = $("#htmlEditorContainer").dxHtmlEditor({
        // ...
    }).dxHtmlEditor("instance");

    function setInvalidStatus(message) {
        htmlEditor.option({
            validationStatus: "invalid",
            validationErrors: [{ message: message }]
        });
    }
});
Angular 
<dx-html-editor
    [validationStatus]="validationStatus"
    [validationErrors]="validationErrors">
</dx-html-editor>
// ...
export class AppComponent {
    validationStatus: string = "valid";
    validationErrors: any;
    // ...
    setInvalidStatus(message) {
        this.validationStatus = "invalid";
        this.validationErrors = [{ message: message }];
    }
}
Vue 
<template>
    <DxHtmlEditor ...
        :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 
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 (
        <HtmlEditor
            validationStatus={validationStatus}
            validationErrors={validationErrors}
        />
    ); 

};
export default App;

Specifies the UI component's value.

Type: any

Default Value: null

HTML Editor automatically removes redundant tags:

<!-- from -->
<p><span>He</span><em><span>llo</span></em></p>

<!-- to -->
<p>He<em>llo</em></p>

View Demo

Configures variables that are placeholders for values created once text is processed.

Selector: DxVariables

Default Value: null

A user can insert variables in the text and remove them, but never modify them.

jQuery 
$(function(){
    $("#htmlEditorContainer").dxHtmlEditor({
        toolbar: {
            // Adds a toolbar item that allows users to insert variables
            items: [ "variable" ]
        },
        variables: {
            dataSource: [ "FirstName", "LastName", "Company" ],
            escapeChar: [ "{", "}" ]
        }
    })
})
Angular 
<dx-html-editor>
    <!-- Adds a toolbar item that allows users to insert variables -->
    <dxo-toolbar>
        <dxi-item name="variable"></dxi-item>
    </dxo-toolbar>
    <dxo-variables
        [dataSource]="[ 'FirstName', 'LastName', 'Company' ]"
        [escapeChar]="[ '{', '}' ]">
    </dxo-variables>
</dx-html-editor>
import { DxHtmlEditorModule } from "devextreme-angular";
// ...
export class AppComponent {
    // ...
}
@NgModule({
    imports: [
        // ...
        DxHtmlEditorModule
    ],
    // ...
})
Vue 
<template>
    <DxHtmlEditor ... >
        <!-- Adds a toolbar item that allows users to insert variables -->
        <DxToolbar>
            <DxItem name="variable" />
        </DxToolbar>
        <DxVariables
            :data-source="variables"
            :escape-char="escapeCharacters"
        />
    </DxHtmlEditor>
</template>

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

import DxHtmlEditor, {
    DxToolbar,
    DxItem,
    DxVariables
} from 'devextreme-vue/html-editor';

export default {
    components: {
        DxHtmlEditor,
        DxVariables
    },
    data() {
        return {
            variables: ['FirstName', 'LastName', 'Company'],
            escapeCharacters: ['{', '}']
        };
    }
}
</script>
React 
import 'devextreme/dist/css/dx.light.css';

import HtmlEditor, {
    Variables
} from 'devextreme-react/html-editor';

const variables = ['FirstName', 'LastName', 'Company'];
const escapeCharacters = ['{', '}'];

export default function App() {
    return (
        <HtmlEditor>
            {/* Adds a toolbar item that allows users to insert variables */}
            <Toolbar>
                <Item name="variable" />
            </Toolbar>
            <Variables
                dataSource={variables}
                escapeChar={escapeCharacters}
            />
        </HtmlEditor>
    );
}

To learn how to implement mail merge with variables, refer to this example:

View on GitHub

Specifies whether the UI component is visible.

Specifies the UI component's width.

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

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