Configuration
This section describes properties that configure the DropDownButton UI component's contents, behavior, and appearance.
| Name | Description |
|---|---|
| accessKey |
Specifies the shortcut key that sets focus on the UI component. |
| activeStateEnabled |
Specifies whether the UI component changes its state as a result of user interaction. |
| dataSource |
Provides data for the drop-down menu. |
| deferRendering |
Specifies whether to wait until the drop-down menu is opened the first time to render its content. |
| disabled |
Specifies whether the UI component responds to user interaction. |
| displayExpr |
Specifies the data field whose values should be displayed in the drop-down menu. |
| dropDownContentComponent |
An alias for the dropDownContentTemplate property specified in React. Accepts a custom component. Refer to Using a Custom Component for more information. |
| dropDownContentRender |
An alias for the dropDownContentTemplate property specified in React. Accepts a rendering function. Refer to Using a Rendering Function for more information. |
| dropDownContentTemplate |
Specifies custom content for the drop-down field. |
| dropDownOptions |
Configures the drop-down field. |
| elementAttr |
Specifies the global attributes to be attached to the UI component's container element. |
| focusStateEnabled |
Specifies whether users can use keyboard to focus the UI component. |
| height |
Specifies the UI component's height. |
| hint |
Specifies text for a hint that appears when a user pauses on the UI component. |
| hoverStateEnabled |
Specifies whether the UI component changes its state when a user hovers the mouse pointer over it. |
| icon |
Specifies the button's icon. |
| itemComponent |
An alias for the itemTemplate property specified in React. Accepts a custom component. Refer to Using a Custom Component for more information. |
| itemRender |
An alias for the itemTemplate property specified in React. Accepts a rendering function. Refer to Using a Rendering Function for more information. |
| items |
Provides drop-down menu items. |
| itemTemplate |
Specifies a custom template for drop-down menu items. |
| keyExpr |
Specifies which data field provides keys used to distinguish between the selected drop-down menu items. |
| noDataText |
Specifies the text or HTML markup displayed in the drop-down menu when it does not contain any items. |
| onButtonClick |
A function that is executed when the button is clicked or tapped. If splitButton is true, this function is executed for the action button only. |
| onContentReady |
A function that is executed when the UI component's content is ready and each time the content is changed. |
| onDisposing |
A function that is executed before the UI component is disposed of. |
| onInitialized |
A function used in JavaScript frameworks to save the UI component instance. |
| onItemClick |
A function that is executed when a drop-down menu item is clicked. |
| onOptionChanged |
A function that is executed after a UI component property is changed. |
| onSelectionChanged |
A function that is executed when an item is selected or selection is canceled. In effect when useSelectMode is true. |
| opened |
Specifies whether the drop-down menu is opened. |
| rtlEnabled |
Switches the UI component to a right-to-left representation. |
| selectedItem |
Contains the selected item's data. Available when useSelectMode is true. |
| selectedItemKey |
Contains the selected item's key and allows you to specify the initially selected item. Applies when useSelectMode is true. |
| showArrowIcon |
Specifies whether the arrow icon should be displayed. |
| splitButton |
Specifies whether to split the button in two: one executes an action, the other opens and closes the drop-down menu. |
| stylingMode |
Specifies how the button is styled. |
| tabIndex |
Specifies the number of the element when the Tab key is used for navigating. |
| text |
Specifies the button's text. Applies only if useSelectMode is false. |
| useItemTextAsTitle |
Specifies whether the DropDownButton uses item's text a title attribute. |
| useSelectMode |
Specifies whether the UI component stores the selected drop-down menu item. |
| visible |
Specifies whether the UI component is visible. |
| width |
Specifies the UI component's width. |
| wrapItemText |
Specifies whether text that exceeds the drop-down list width should be wrapped. |
Methods
| Name | Description |
|---|---|
| beginUpdate() |
Prevents the UI component from refreshing until the endUpdate() method is called. |
| close() |
Closes the drop-down menu. |
| defaultOptions(rule) |
Specifies the device-dependent default configuration properties for this component. |
| dispose() |
Disposes of all the resources allocated to the DropDownButton instance. |
| element() |
Gets the root UI component element. |
| endUpdate() |
Refreshes the UI component after a call of the beginUpdate() method. |
| focus() |
Sets focus on the UI component. |
| getDataSource() |
Gets the DataSource instance. |
| getInstance(element) |
Gets the instance of a UI component found using its DOM node. |
| instance() |
Gets the UI component's instance. Use it to access other methods of the UI component. |
| off(eventName) |
Detaches all event handlers from a single event. |
| off(eventName, eventHandler) |
Detaches a particular event handler from a single event. |
| on(eventName, eventHandler) |
Subscribes to an event. |
| on(events) |
Subscribes to events. |
| open() |
Opens the drop-down menu. |
| option() |
Gets all UI component properties. |
| option(optionName) |
Gets the value of a single property. |
| option(optionName, optionValue) |
Updates the value of a single property. |
| option(options) |
Updates the values of several properties. |
| registerKeyHandler(key, handler) |
Registers a handler to be executed when a user presses a specific key. |
| repaint() |
Repaints the UI component without reloading data. Call it to update the UI component's markup. |
| resetOption(optionName) |
Resets a property to its default value. |
| toggle() |
Opens or closes the drop-down menu, reversing the current state. |
| toggle(visibility) |
Opens or closes the drop-down menu, depending on the argument. |
Events
| Name | Description |
|---|---|
| buttonClick |
Raised when the button is clicked. |
| contentReady |
Raised when the UI component's content is ready. |
| disposing |
Raised before the UI component is disposed of. |
| initialized |
Raised only once, after the UI component is initialized. |
| itemClick |
Raised when an item in the drop-down filed is clicked. |
| optionChanged |
Raised after a UI component property is changed. |
| selectionChanged |
Raised when an item is selected or selection is canceled. |