Configuration

An object defining configuration options for the Menu widget.

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

A Boolean value specifying whether or not the widget changes its state when interacting with a user.

Type: Boolean
Default Value: true

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

adaptivityEnabled

Specifies whether or not adaptive widget rendering is enabled on a small screen.

Type: Boolean
Default Value: false

While displaying Menu in your app, you may want to use different layouts for different screen sizes. Note that desktop monitors provide enough space to display all the menu items, but mobile screens do not. In such cases, you can enable the widget to have a more compact representation. For this purpose, assign true to the adaptivityEnabled option. In the adaptive mode, the menu is shown as a list icon, and items have a tree structure like the TreeView items.

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animation

An object that defines the animation options of the widget.

Type: Object
Default Value: { show: { type: 'fade', from: 0, to: 1, duration: 100 }, hide: { type: 'fade', from: 1, to: 0, duration: 100 } }

cssClass

Specifies the name of the CSS class to be applied to the root menu level and all submenus.

Type: String
Default Value: ''

Use this option to customize the current menu in isolation from other menus created on the same page.

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dataSource

A data source used to fetch data to be displayed by the widget.

Default Value: null

This option accepts one of the following.

  • Array of objects
    A simple JavaScript array containing a collection of plain objects.

  • URL
    A URL to JSON data or to a service returning data in JSON format.

  • DataSource or its configuration object
    A DataSource is an object that provides a handy API for data processing. A DataSource is a stateful object, which means that it saves data processing settings and applies them each time data is loaded. All underlying data access logic of a DataSource is isolated in a Store. A Store provides an API for reading and modifying data. Unlike the DataSource, a Store is a stateless object.

NOTE
If the data source is specified using the dataSource option, use the items option only for reading. Updating data items using the items option may cause unexpected results.

To display widget items, a default template can be used. This template is based on the data source fields that are listed in the Default Item Template section of the widget's API.

disabled

Specifies whether the widget responds to user interaction.

Type: Boolean
Default Value: false

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disabledExpr

Specifies the name of the data source item field whose value defines whether or not the corresponding widget item is disabled.

Type: String| function
Default Value: 'disabled'

displayExpr

Specifies the name of the data source item field whose value is displayed by the widget.

Type: String| function
Default Value: 'text'

elementAttr

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

Type: Object
Default Value: {}

When you configure this option in an ASP.NET MVC Control, pass a dictionary as shown in the following code.

Razor C#
Razor VB
@(Html.DevExtreme()
    // other widget options
    // ...
    .ElementAttr(new Dictionary<string, object>() {
        { "id", "elementId" },
        { "class", "class-name" },
        // ...
    })
)
@(Html.DevExtreme().WidgetName() _
    .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: false
Default for desktop: true

height

Specifies the height of the widget.

Type: Number|String| function
Return Value: Number|String
The height of the widget.
Default Value: undefined

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

  • Number
    The height of the widget 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;
    }

hideSubmenuOnMouseLeave

Specifies whether or not the submenu is hidden when the mouse pointer leaves it.

Type: Boolean
Default Value: false

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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: true

items

Holds an array of menu items.

Type: Array

To display menu items, a default template can be used. This template is based on certain fields of the item object. Refer to the Default Item Template section to learn which fields are taken into account when creating a default template for items. Alternatively, you can implement a custom item template.

NOTE
Each item of the array passed to the items option can include the items field, which takes on an object with the same structure as a root item. Therefore, you can create as many menu levels as you need.
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itemsExpr

Specifies the name of the data source item field that contains an array of nested items.

Type: String| function
Default Value: 'items'

itemTemplate

The template to be used for rendering items.

Type: template
Function parameters:
itemData: Object
The item object to be rendered.
itemIndex: Number
The index of the item to be rendered.
itemElement: jQuery
An HTML element of the item to be rendered.
Return Value: String|DOM Node|jQuery
A template name or a template container.
Default Value: 'item'

A binding context of an item template is the data source object that corresponds to the currently rendered item.

In Knockout approach, you can bind template elements to the item object's fields directly. To access another binding context within an item template, use Knockout binding variables.

In AngularJS Approach, if you need to access item object's fields within a template, use a variable whose name is assigned to the dx-item-alias directive. Add the directive to the widget element to specify an alias to the root object of an item. Without this directive, item object fields are beyond reach. To access another binding context within an item template, use AngularJS binding variables.

See Also

onContentReady

A handler for the contentReady event. Executed when the widget's content is ready. This handler may be executed multiple times during the widget's lifetime depending on the number of times its content changes.

Type: function
Function parameters:
Information about the event.
Object structure:
component: Object
The widget's instance.
element: jQuery
The widget's container.
model: Object
The model data. Available only when using Knockout.
Default Value: null

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onDisposing

A handler for the disposing event. Executed when the widget is removed from the DOM using the remove(), empty(), or html() jQuery methods only.

Type: function
Function parameters:
Information about the event.
Object structure:
component: Object
The widget instance.
element: jQuery
The widget's container.
model: Object
The model data. Available only if you use Knockout.
Default Value: null

onInitialized

A handler for the initialized event. Executed only once, after the widget is initialized.

Type: function
Function parameters:
Information about the event.
Object structure:
component: Object
The widget instance.
element: jQuery
The widget's container.
Default Value: null

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

onItemClick

A handler for the itemClick event.

Type: function |String
Function parameters:
Provides function parameters.
Object structure:
component: Object
Provides access to the widget instance.
element: jQuery
An HTML element of the widget.
model: Object
Provides access to the data that is available for binding against the element. Available only in the Knockout approach.
itemData: Object
The data that is bound to the clicked item.
itemElement: jQuery
An HTML element of the item.
itemIndex: Number
Specifies the index of the clicked item.
jQueryEvent: jQuery.Event
Specifies the jQuery event that caused action execution.
Default Value: null

Assign a function to perform a custom action when a widget item is clicked.

To navigate to a specific URL when the itemClick event fires, assign that URL or the anchor part (#) of that URL directly to this option as a string.

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onItemContextMenu

A handler for the itemContextMenu event.

Type: function
Function parameters:
Provides function parameters.
Object structure:
component: Object
Provides access to the widget instance.
element: jQuery
An HTML element of the widget.
model: Object
Provides access to the data that is available for binding against the element. Available only in the Knockout approach.
itemData: Object
The data that is bound to the item.
itemElement: jQuery
An HTML element of the item.
itemIndex: Number
Specifies the index of the item.
jQueryEvent: jQuery.Event
Specifies the jQuery event that caused action execution.
Default Value: null

Assign a function to perform a custom action when the right mouse button is clicked when the pointer is over a widget item, or when the "sustained" (also known as a long press) touch action is performed.

onItemRendered

A handler for the itemRendered event.

Type: function
Function parameters:
Provides function parameters.
Object structure:
component: Object
Provides access to the widget instance.
element: jQuery
An HTML element of the widget.
model: Object
Provides access to the data available for binding against the element. Available only in the Knockout approach.
itemData: Object
The data that is bound to the item to be rendered.
itemElement: jQuery
An HTML element of the item.
itemIndex: Number
Specifies the index of the rendered item.
Default Value: null

Assign a function to perform a custom action after a collection item is rendered.

onOptionChanged

A handler for the optionChanged event. Executed after an option of the widget is changed.

Type: function
Function parameters:
Information about the event.
Object structure:
component: Object
The widget instance.
name: String
A short name of the option whose value has been changed.
fullName: String
A full name of the option whose value has been changed; contains a full hierarchy of the option.
value: any
A new value for the option.
element: jQuery
The widget's container.
model: Object
The model data. Available only if you use Knockout.
Default Value: null

onSelectionChanged

A handler for the selectionChanged event.

Type: function
Function parameters:
Provides function parameters.
Object structure:
component: Object
Provides access to the widget instance.
element: jQuery
An HTML element of the widget.
model: Object
Provides access to the data that is available for binding against the element. Available only in the Knockout approach.
addedItems: Array
An array of items added to selection.
removedItems: Array
An array of items removed from selection.
Default Value: null

This option makes sense only if the selectionMode option is set to 'single' and the selectByClick option is set to true.

Assign a function to perform a custom action after a collection item is selected or unselected.

onSubmenuHidden

A handler for the submenuHidden event.

Type: function
Function parameters:
Provides function parameters.
Object structure:
component: Object
Provides access to the widget instance.
element: jQuery
An HTML element of the widget.
model: Object
Provides access to the data that is available for binding against the element. Available only in the Knockout approach.
rootItem: jQuery
A jQuery object of the root menu element for which the submenu is hidden.
Default Value: null

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onSubmenuHiding

A handler for the submenuHiding event.

Type: function
Function parameters:
Provides function parameters.
Object structure:
component: Object
Provides access to the widget instance.
element: jQuery
An HTML element of the widget.
model: Object
Provides access to the data that is available for binding against the element. Available only in the Knockout approach.
rootItem: jQuery
A jQuery object of the root menu element for which the submenu is being hidden.
cancel: Boolean
Specifies whether or not to cancel the hiding of the widget.
Default Value: null

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onSubmenuShowing

A handler for the submenuShowing event.

Type: function
Function parameters:
Provides function parameters.
Object structure:
component: Object
Provides access to the widget instance.
element: jQuery
An HTML element of the widget.
model: Object
Provides access to the data that is available for binding against the element. Available only in the Knockout approach.
rootItem: jQuery
A jQuery object of the root menu element for which the submenu is being displayed.
Default Value: null

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onSubmenuShown

A handler for the submenuShown event.

Type: function
Function parameters:
Provides function parameters.
Object structure:
component: Object
Provides access to the widget instance.
element: jQuery
An HTML element of the widget.
model: Object
Provides access to the data that is available for binding against the element. Available only in the Knockout approach.
rootItem: jQuery
A jQuery object of the root menu element for which the submenu is displayed.
Default Value: null

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orientation

Specifies whether the menu has horizontal or vertical orientation.

Type: String
Default Value: 'horizontal'
Accepted Values: 'horizontal' | 'vertical'

When using the widget as an ASP.NET MVC Control, specify this option using the Orientation enum. This enum accepts the following values: Horizontal and Vertical.

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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
});
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selectByClick

Specifies whether or not an item becomes selected if a user clicks it.

Type: Boolean
Default Value: false

selectedExpr

Specifies the name of the data source item field whose value defines whether or not the corresponding widget items is selected.

Type: String| function
Default Value: 'selected'

selectedItem

The selected item object.

Type: Object
Default Value: null

selectionByClick

Deprecated

Use the selectByClick option instead.

Specifies whether or not an item becomes selected if an end-user clicks it.

Type: Boolean
Default Value: false

selectionMode

Specifies the selection mode supported by the menu.

Type: String
Default Value: none
Accepted Values: 'single' | 'none'

To select an item on click and to visually display the selection, set the selectByClick option to true. Note that in this case the selectionMode should be 'single'.

When using the widget as an ASP.NET MVC Control, specify this option using the MenuSelectionMode enum. This enum accepts the following values: Single and None.

showFirstSubmenuMode

Specifies options for showing and hiding the first level submenu.

Type: Object|String
Default Value: { name: 'onClick', delay: { show: 50, hide: 300 } }
Accepted Values: 'onHover' | 'onClick'

If you assign a string that specifies the mode name to this option, the widget will use the default delay value.

JavaScript
showFirstSubmenuMode: "onHover"

When using the widget as an ASP.NET MVC Control, you can specify this option using the ShowSubmenuMode enum. This enum accepts the following values: OnHover and OnClick.

showSubmenuMode

Specifies options of submenu showing and hiding.

Type: Object|String
Default Value: { name: 'onHover', delay: { show: 0, hide: 0 } }
Accepted Values: 'onHover' | 'onClick'

By default, the secondary-level submenus of the Menu widget are displayed on the same event as the first-level submenu. To set another event for displaying secondary-level submenus, use the showSubmenuMode option. Alternatively, you can change the event on which the first-level submenu is displayed. For this purpose, use the showFirstSubmenuMode option.

When using the widget as an ASP.NET MVC Control, you can specify this option using the ShowSubmenuMode enum. This enum accepts the following values: OnHover and OnClick.

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submenuDirection

Specifies the direction at which the submenus are displayed.

Type: String
Default Value: 'auto'
Accepted Values: 'auto' | 'rightOrBottom' | 'leftOrTop'

By default, the first submenu is displayed so that it is visible totally, based on the menu location on the page. Use the submenuDirection option to display the first submenu at the bottom or at the top of a root item when the widget's orientation is horizontal, and to the left or to the right when orientation is vertical.

When using the widget as an ASP.NET MVC Control, specify this option using the SubmenuDirection enum. This enum accepts the following values: LeftOrTop, RightOrBottom and Auto.

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.

visible

Specifies whether the widget is visible.

Type: Boolean
Default Value: true

width

Specifies the width of the widget.

Type: Number|String| function
Return Value: Number|String
The width of the widget.
Default Value: undefined

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

  • Number
    The width of the widget 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;
    }