Methods

This section describes members used to manipulate the widget.

beginUpdate()

Prevents the widget from refreshing until the endUpdate() method is called.

The beginUpdate() and endUpdate() methods prevent the widget from excessive updates when you are changing multiple widget settings at once. After the beginUpdate() method is called, the widget does not update its UI until the endUpdate() method is called.

See Also

defaultOptions(rule)

Specifies the device-dependent default configuration options for this component.

Parameters:
rule: Object

An object specifying default options for the component and the device for which the options must be applied.

Object structure:
device: Object|Array|function

An object representing device parameters, or an array of objects representing device parameters, or a function that provides information on the current device as an input parameter and returning a Boolean value.

options: Object

A configuration object with specified options.

The defaultOptions method is a static method supported by the widget class. The following code demonstrates how to specify default options for all buttons in the application executed on the iOS platform.

JavaScript
DevExpress.ui.dxButton.defaultOptions({ 
    device: { platform: "ios" },
    options: {
        text: "Click me"
    }
});

element()

Gets the root element of the widget.

Return Value: jQuery

The root element of the widget.

See Also

endUpdate()

Refreshes the widget after a call of the beginUpdate() method.

Main article: beginUpdate()

See Also

focus()

Sets focus on the widget.

See Also

getDataSource()

Gets the DataSource instance.

Return Value: DataSource

The DataSource instance.

See Also

goToItem(itemIndex, animation)

Shows the specified gallery item.

Parameters:
itemIndex: Number

An index of the required gallery item.

animation: Boolean

A Boolean value indicating whether or not to use animation when switching to the required item.

Return Value: jQuery.Promise

A deferred object resolved after the gallery item has changed.

See Also
Show Example:
jQuery

instance()

Returns this widget's instance. Use it to access other methods of the widget.

Return Value: Object

This widget's instance.

See Also

nextItem(animation)

Shows the next gallery item.

Parameters:
animation: Boolean

A Boolean value indicating whether or not to use animation when switching to the next item.

Return Value: jQuery.Promise

A deferred object resolved after the gallery item has changed.

If the current item is the last item in the gallery, the method behavior depends on the loop option value. If loop is set to true, the first item is shown. Otherwise, the method does nothing.

See Also
Show Example:
jQuery

off(eventName)

Detaches all event handlers from the specified event.

Parameters:
eventName: String

The name of the event to unsubscribe from.

Return Value: Object

The object for which this method is called.

See Also

off(eventName, eventHandler)

Detaches a particular event handler from the specified event.

Parameters:
eventName: String

The name of the event to unsubscribe from.

eventHandler: function

The handler to be detached from the specified event.

Return Value: Object

The object for which this method is called.

See Also

on(eventName, eventHandler)

Subscribes to a specified event.

Parameters:
eventName: String

The name of the event to be subscribed.

eventHandler: function

An event handler for the specified event.

Return Value: Object

The object for which this method is called.

Use this method to subscribe to one of the events listed in the Events section.

See Also

on(events)

Subscribes to the specified events.

Parameters:
events: Object

An object of the following structure: { "eventName1": handler1, "eventName2": handler2, ...}

Return Value: Object

The object for which this method is called.

Use this method to subscribe to several events with one method call. Available events are listed in the Events section.

See Also

option()

Gets the widget's options.

Return Value: Object

The widget's options.

See Also

option(optionName)

Gets a specific option value.

Parameters:
optionName: String

The option name or the full path to the option.

Return Value: any

This option value.

See Also

option(optionName, optionValue)

Assigns a new value to a specific option.

Parameters:
optionName: String

The option name or the full path to the option.

optionValue: any

A new value for this option.

See Also

option(options)

Sets one or more options.

Parameters:
options: Object

The options along with their new values.

See Also

prevItem(animation)

Shows the previous gallery item.

Parameters:
animation: Boolean

A Boolean value indicating whether or not to use animation when switching to the previous item.

Return Value: jQuery.Promise

A deferred object resolved after the gallery item has changed.

If the current item is the first item in the gallery, the method behavior depends on the loop option value. If loop is set to true, the last item is shown. Otherwise, the method does nothing.

See Also
Show Example:
jQuery

registerKeyHandler(key, handler)

Registers a handler to be executed when a user presses a specific key.

Parameters:
key: String

The key for which the handler should be registered.

handler: function

A handler.

The key argument accepts one of the following values:

  • "backspace"
  • "tab"
  • "enter"
  • "escape"
  • "pageUp"
  • "pageDown"
  • "end"
  • "home"
  • "leftArrow"
  • "upArrow"
  • "rightArrow"
  • "downArrow"
  • "del"
  • "space"
  • "F"
  • "A"
  • "asterisk"
  • "minus"

A custom handler for a key cancels the default handler for this key.

See Also
Show Example:
jQuery

repaint()

Repaints the widget. Call it if you made modifications that changed the widget's state to invalid.

See Also