Configuration

An object defining configuration options for the NavBar 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.

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.

Show Example:
AngularJS
Knockout
jQuery

disabled

Specifies whether the widget responds to user interaction.

Type: Boolean
Default Value: false

Show Example:
AngularJS
Knockout
jQuery

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 generic: 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;
    }

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

itemHoldTimeout

The time period in milliseconds before the onItemHold event is raised.

Type: Number
Default Value: 750

items

An array of items displayed by the widget.

Type: Array

You can use the dataSource option instead. Unlike the items option, the dataSource option can take on the DataSource configuration object as well as a simple array.

NOTE
If you need to modify the data source specified using the items option at runtime, do it only with the help of the items option. Updating data items using the dataSource 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.

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
Show Example:
AngularJS
Knockout
jQuery

keyExpr

Specifies which data field provides keys for widget items.

Type: String| function
Default Value: null
NOTE
The key value should be unique within the data array.
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

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.

Show Example:
AngularJS
Knockout
jQuery

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.

onItemHold

A handler for the itemHold 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 being held.
itemElement: jQuery
An HTML element of the item.
itemIndex: Number
Specifies the index of the item being held.
Default Value: null

Assign a function to perform a custom action when the widget's collection item is being held for a specified time period (see the itemHoldTimeout option).

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

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

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
});

scrollByContent

Specifies whether or not an end-user can scroll tabs by swiping.

Type: Boolean
Default Value: true
Default for desktop: false

selectedIndex

The index of the currently selected widget item.

Type: Number
Default Value: -1

Show Example:
AngularJS
Knockout
jQuery

selectedItem

The selected item object.

Type: Object
Default Value: null

selectedItemKeys

Specifies an array of currently selected item keys.

Type: Array

The item keys can be specified using the keyExpr option or the key option within the underlying Store.

See Also

selectedItems

An array of currently selected item objects.

Type: Array

selectionMode

Specifies whether the widget enables an end-user to select only a single item or multiple items.

Type: String
Default Value: 'single'
Accepted Values: 'multiple' | 'single'

When using the widget as an ASP.NET MVC Control, specify this option using the NavSelectionMode enum. This enum accepts the following values: Single and Multiple.

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;
    }