Configuration

This section describes options that configure the HtmlEditor widget's contents, behavior, and appearance.

See Also

accessKey

Specifies the shortcut key that sets focus on the widget.

Type:

String

Default Value: null

The value of this option will be passed to the accesskey attribute of the HTML element that underlies the widget.

activeStateEnabled

Specifies whether or not the widget changes its state when interacting with a user.

Type:

Boolean

Default Value: false

This option is used when the widget is displayed on a platform whose guidelines include the active state change for widgets.

disabled

Specifies whether the widget responds to user interaction.

Type:

Boolean

Default Value: false

elementAttr

Specifies the attributes to be attached to the widget's root element.

Type:

Object

Default Value: {}
jQuery
$(function(){
    $("#htmlEditorContainer").dxHtmlEditor({
        // ...
        elementAttr: {
            id: "elementId",
            class: "class-name"
        }
    });
});
Angular
HTML
TypeScript
<dx-html-editor ...
    [elementAttr]="{ id: 'elementId', class: 'class-name' }">
</dx-html-editor>
import { DxHtmlEditorModule } from "devextreme-angular";
// ...
export class AppComponent {
    // ...
}
@NgModule({
    imports: [
        // ...
        DxHtmlEditorModule
    ],
    // ...
})
ASP.NET MVC Control
Razor C#
Razor VB
@(Html.DevExtreme().HtmlEditor()
    .ElementAttr("class", "class-name")
    // ===== or =====
    .ElementAttr(new {
        @id = "elementId",
        @class = "class-name"
    })
    // ===== or =====
    .ElementAttr(new Dictionary<string, object>() {
        { "id", "elementId" },
        { "class", "class-name" }
    })

)
@(Html.DevExtreme().HtmlEditor() _
    .ElementAttr("class", "class-name")
    ' ===== or =====
    .ElementAttr(New With {
        .id = "elementId",
        .class = "class-name"
    })
    ' ===== or =====
    .ElementAttr(New Dictionary(Of String, Object) From {
        { "id", "elementId" },
        { "class", "class-name" }
    })
)

focusStateEnabled

Specifies whether the widget can be focused using keyboard navigation.

Type:

Boolean

Default Value: true

height

Specifies the widget's height.

Type:

Number

|

String

|

Function

Return Value:

Number

|

String

The widget's height.

Default Value: undefined

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

  • Number
    The height in pixels.

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

  • Function
    A function returning either of the above. For example:

    JavaScript
    height: function() {
        return window.innerHeight / 1.5;
    }

hint

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

Type:

String

Default Value: undefined

hoverStateEnabled

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

Type:

Boolean

Default Value: false

isValid

Specifies whether the editor's value is valid.

Type:

Boolean

Default Value: true

In Knockout apps, you may need to inform a user about an error that occurred during the validation of a view model field. For this purpose, set the editor's isValid option to the isValid value of the dxValidator that validates this field. To show an error message, set the editor's validationError option to the dxValidator's validationError value.

JavaScript
var editorValue = ko.observable("").extend({
    dxValidator: {
        validationRules: [{
            type: "required",
            message: "Specify this value"
        }]
    }
});
var viewModel = {
    editorOptions: {
        value: editorValue,
        isValid: editorValue.dxValidator.isValid,
        validationError: editorValue.dxValidator.validationError
    }
};

The editor's isValid and validationError options should also be specified when using a custom validation engine. In this instance, the validation result will be displayed for the editor by the means of the DevExtreme Validation UI.

See Also

onContentReady

A function that is executed when the widget's content is ready and each time the content is changed.

Type:

Function

Function parameters:
e:

Object

Information about the event.

Object structure:
component:

HtmlEditor

The widget's instance.

element:

Element (jQuery or HTML)

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

model:

Object

The model data. Available only when using Knockout.

Default Value: null

onDisposing

A function that is executed before the widget is disposed of.

Type:

Function

Function parameters:
e:

Object

Information about the event.

Object structure:
component:

HtmlEditor

The widget's instance.

element:

Element (jQuery or HTML)

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

model:

Object

The model data. Available only if you use Knockout.

Default Value: null

onFocusIn

A function that is executed when the widget gets focus.

Type:

Function

Function parameters:
e:

Object

Information about the event that caused the function execution.

Object structure:
component:

HtmlEditor

The widget's instance.

element:

Element (jQuery or HTML)

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

model:

Object

The model data. Available only if you use Knockout.

event:

Event (jQuery or dxEvent)

The event that caused the function execution. It is a dxEvent or a jQuery.Event when you use jQuery.

Default Value: null
See Also

onFocusOut

A function that is executed when the widget loses focus.

Type:

Function

Function parameters:
e:

Object

Information about the event that caused the function execution.

Object structure:
component:

HtmlEditor

The widget's instance.

element:

Element (jQuery or HTML)

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

model:

Object

The model data. Available only if you use Knockout.

event:

Event (jQuery or dxEvent)

The event that caused the function execution. It is a dxEvent or a jQuery.Event when you use jQuery.

Default Value: null
See Also

onInitialized

A function that is executed only once, after the widget is initialized.

Type:

Function

Function parameters:
e:

Object

Information about the event.

Object structure:
component:

HtmlEditor

The widget's instance.

element:

Element (jQuery or HTML)

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

Default Value: null

You cannot access widget elements in this function because it is executed before they are ready. Use the onContentReady function instead.

onOptionChanged

A function that is executed after a widget option is changed.

Type:

Function

Function parameters:
e:

Object

Information about the event.

Object structure:
component:

HtmlEditor

The widget's instance.

name:

String

The option's short name.

fullName:

String

The option's full name.

value: any

The option's new value.

element:

Element (jQuery or HTML)

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

model:

Object

The model data. Available only if you use Knockout.

Default Value: null

onValueChanged

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

Type:

Function

Function parameters:
e:

Object

Information about the event.

Object structure:
component:

HtmlEditor

The widget's instance.

element:

Element (jQuery or HTML)

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

model:

Object

The model data. Available only if Knockout is used.

value:

Object

The widget's new value.

previousValue:

Object

The widget's previous value.

jQueryEvent:

jQuery.Event

The jQuery event that caused the handler execution. Deprecated in favor of the event field.

event:

Event (jQuery or dxEvent)

The event that caused the handler execution. It is a dxEvent or a jQuery.Event when you use jQuery.

Default Value: null

placeholder

Specifies the text displayed when the input field is empty.

Type:

String

Default Value: ''

readOnly

A Boolean value specifying whether or not the widget is read-only.

Type:

Boolean

Default Value: false

rtlEnabled

Switches the widget to a right-to-left representation.

Type:

Boolean

Default Value: false

When this option is set to true, the widget 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
});
See Also

tabIndex

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

Type:

Number

Default Value: 0

The value of this option will be passed to the tabindex attribute of the HTML element that underlies the widget.

toolbar

Configures the widget's toolbar.

Default Value: null

DevExtreme HTML5 JavaScript HtmlEditor Toolbar

validationError

Specifies information on the validation error when using a custom validation engine. Should be changed at runtime along with the isValid option.

Type:

Object

Default Value: undefined

validationMessageMode

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

Type:

String

Default Value: 'auto'
Accepted Values: 'always' | 'auto'

The following option 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.

Use the ValidationMessageMode enum to specify this option when the widget is used as an ASP.NET MVC Control. This enum accepts the following values: Auto and Always.

value

Specifies the widget's value.

Type: any
Default Value: null
Raised Events: valueChanged

valueType

Specifies in which markup language the value is stored.

Type:

String

Default Value: 'html'
Accepted Values: 'html' | 'markdown'
NOTE

Markdown requires the turndown and showdown libraries. If you use browser scripts, link them before the DevExtreme scripts. If you use JavaScript modules, don't install the libraries; import the markdown converter instead:

import "devextreme/ui/html_editor/converters/markdown";
// or
// require("ui/html_editor/converters/markdown");

View Demo

Use the HtmlEditorValueType enum to specify this option when the widget is used as an ASP.NET MVC Control. This enum accepts the following values: Html and Markdown.

variables

Configures variables, which are placeholders to be replaced with actual values when processing text.

Default Value: null

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

jQuery
JavaScript
$(function(){
    $("#htmlEditorContainer").dxHtmlEditor({
        toolbar: {
            // Adds a toolbar control that allows users to insert variables
            items: [ "variable" ]
        },
        variables: {
            dataSource: [ "FirstName", "LastName", "Company" ],
            escapeChar: [ "{", "}" ]
        }
    })
})
Angular
HTML
TypeScript
<dx-html-editor>
    <!-- Adds a toolbar control that allows users to insert variables -->
    <dxo-toolbar [items]="[ 'variable' ]"></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
    ],
    // ...
})

visible

Specifies whether the widget is visible.

Type:

Boolean

Default Value: true

width

Specifies the widget's width.

Type:

Number

|

String

|

Function

Return Value:

Number

|

String

The widget's width.

Default Value: undefined

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

  • Number
    The width in pixels.

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

  • Function
    A function returning either of the above. For example:

    JavaScript
    width: function() {
        return window.innerWidth / 1.5;
    }