JavaScript/jQuery Lookup API
The Lookup is a UI component that allows an end user to search for an item in a collection shown in a drop-down menu.
See Also
- Set Up DevExtreme: Angular | Vue | React | jQuery | AngularJS | Knockout | ASP.NET MVC 5 | ASP.NET Core
- Configure a Widget: Angular | Vue | React | jQuery | AngularJS | Knockout | ASP.NET MVC 5 | ASP.NET Core
Configuration
| Name | Description |
|---|---|
| accessKey |
Specifies the shortcut key that sets focus on the UI component. |
| activeStateEnabled |
Specifies whether or not the UI component changes its state when interacting with a user. |
| applyButtonText |
The text displayed on the Apply button. |
| applyValueMode |
Specifies the way an end-user applies the selected value. |
| cancelButtonText |
The text displayed on the Cancel button. |
| cleanSearchOnOpening |
Specifies whether or not the UI component cleans the search box when the popup window is displayed. |
| clearButtonText |
The text displayed on the Clear button. |
| dataSource |
Binds the UI component to data. |
| deferRendering |
Specifies whether to render the drop-down field's content when it is displayed. If false, the content is rendered immediately. |
| disabled |
Specifies whether the UI component responds to user interaction. |
| displayExpr |
Specifies the data field whose values should be displayed. |
| displayValue |
Returns the value currently displayed by the UI component. |
| dropDownCentered |
Specifies whether to vertically align the drop-down menu so that the selected item is in its center. Applies only in Material Design themes. |
| dropDownOptions |
Configures the drop-down field. |
| elementAttr |
Specifies the global attributes to be attached to the UI component's container element. |
| fieldComponent |
An alias for the fieldTemplate property specified in React. Accepts a custom component. Refer to Using a Custom Component for more information. |
| fieldRender |
An alias for the fieldTemplate property specified in React. Accepts a rendering function. Refer to Using a Rendering Function for more information. |
| fieldTemplate |
Specifies a custom template for the input field. |
| focusStateEnabled |
Specifies whether the UI component can be focused using keyboard navigation. |
| groupComponent |
An alias for the groupTemplate property specified in React. Accepts a custom component. Refer to Using a Custom Component for more information. |
| grouped |
A Boolean value specifying whether or not to group UI component items. |
| groupRender |
An alias for the groupTemplate property specified in React. Accepts a rendering function. Refer to Using a Rendering Function for more information. |
| groupTemplate |
Specifies a custom template for group captions. |
| 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 pauses on it. |
| inputAttr |
Specifies the attributes to be passed on to the underlying HTML element. |
| isValid |
Specifies or indicates whether the editor's value is valid. |
| 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 |
An array of items displayed by the UI component. |
| itemTemplate |
Specifies a custom template for items. |
| minSearchLength |
The minimum number of characters that must be entered into the text box to begin a search. Applies only if searchEnabled is true. |
| name |
The value to be assigned to the |
| nextButtonText |
The text displayed on the button used to load the next page from the data source. |
| noDataText |
The text or HTML markup displayed by the UI component if the item collection is empty. |
| onClosed |
A function that is executed once the drop-down editor is closed. |
| 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 list item is clicked or tapped. |
| onOpened |
A function that is executed once the drop-down editor is opened. |
| onOptionChanged |
A function that is executed after a UI component property is changed. |
| onPageLoading |
A function that is executed before the next page is loaded. |
| onPullRefresh |
A function that is executed when the "pull to refresh" gesture is performed on the drop-down item list. Supported on mobile devices only. |
| onScroll |
A function that is executed on each scroll gesture performed on the drop-down item list. |
| onSelectionChanged |
A function that is executed when a list item is selected or selection is canceled. |
| onValueChanged |
A function that is executed after the UI component's value is changed. |
| opened |
Specifies whether or not the drop-down editor is displayed. |
| pageLoadingText |
Specifies the text shown in the pullDown panel, which is displayed when the UI component is scrolled to the bottom. |
| pageLoadMode |
Specifies whether the next page is loaded when a user scrolls the UI component to the bottom or when the "next" button is clicked. |
| placeholder |
The text displayed by the UI component when nothing is selected. |
| pulledDownText |
Specifies the text displayed in the pullDown panel when the UI component is pulled below the refresh threshold. |
| pullingDownText |
Specifies the text shown in the pullDown panel while the list is being pulled down to the refresh threshold. |
| pullRefreshEnabled |
A Boolean value specifying whether or not the UI component supports the "pull down to refresh" gesture. |
| refreshingText |
Specifies the text displayed in the pullDown panel while the UI component is being refreshed. |
| rtlEnabled |
Switches the UI component to a right-to-left representation. |
| searchEnabled |
Specifies whether the search box is visible. |
| searchExpr |
Specifies the name of a data source item field or an expression whose value is compared to the search criterion. |
| searchMode |
Specifies a comparison operation used to search UI component items. |
| searchPlaceholder |
The text that is provided as a hint in the lookup's search bar. |
| searchTimeout |
Specifies the time delay, in milliseconds, after the last character has been typed in, before a search is executed. |
| selectedItem |
Gets the currently selected item. |
| showCancelButton |
Specifies whether to display the Cancel button in the lookup window. |
| showClearButton |
Specifies whether to display the Clear button in the lookup window. |
| showDataBeforeSearch |
Specifies whether or not the UI component displays unfiltered values until a user types a number of characters exceeding the minSearchLength property value. |
| stylingMode |
Specifies how the UI component's text field is styled. |
| tabIndex |
Specifies the number of the element when the Tab key is used for navigating. |
| text |
The read-only property that holds the text displayed by the UI component input element. |
| useNativeScrolling |
Specifies whether or not the UI component uses native scrolling. |
| usePopover |
Specifies whether to show lookup contents in the Popover UI component. |
| validationError |
Information on the broken validation rule. Contains the first item from the validationErrors array. |
| validationErrors |
An array of the validation rules that failed. |
| validationMessageMode |
Specifies how the message about the validation rules that are not satisfied by this editor's value is displayed. |
| validationStatus |
Indicates or specifies the current validation status. |
| value |
Specifies the currently selected value. May be an object if dataSource contains objects and valueExpr is not set. |
| valueChangeEvent |
Specifies the DOM events after which the UI component's search results should be updated. |
| valueExpr |
Specifies which data field provides unique values to the UI component's value. |
| 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. |
See Also
- Configure a Widget: Angular | Vue | React | jQuery | AngularJS | Knockout | ASP.NET MVC 5 | ASP.NET Core
Methods
| Name | Description |
|---|---|
| beginUpdate() |
Prevents the UI component from refreshing until the endUpdate() method is called. |
| blur() |
Removes focus from the input element. |
| close() |
Closes the drop-down editor. |
| content() |
Gets the popup window's content. |
| defaultOptions(rule) |
Specifies the device-dependent default configuration properties for this component. |
| dispose() |
Disposes of all the resources allocated to the Lookup instance. |
| element() |
Gets the root UI component element. |
| endUpdate() |
Refreshes the UI component after a call of the beginUpdate() method. |
| field() |
Gets the UI component's |
| focus() |
Sets focus to the input element representing 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 editor. |
| 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. |
| reset() |
Resets the value property to the default value. |
| resetOption(optionName) |
Resets an property to its default value. |
See Also
- Call Methods: Angular | Vue | React | jQuery | AngularJS | Knockout | ASP.NET MVC 5 | ASP.NET Core
Events
| Name | Description |
|---|---|
| closed |
Raised once the drop-down editor is closed. |
| 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 a list item is clicked or tapped. |
| opened |
Raised once the drop-down editor is opened. |
| optionChanged |
Raised after a UI component property is changed. |
| pageLoading |
Raised before the next page is loaded. |
| pullRefresh |
Raised when the "pull to refresh" gesture is performed on the drop-down item list. |
| scroll |
Raised on each scroll gesture performed on the drop-down item list. |
| selectionChanged |
Raised when a list item is selected or selection is canceled. |
| valueChanged |
Raised after the UI component's value is changed. |
See Also
- Handle Events: Angular | Vue | React | jQuery | AngularJS | Knockout | ASP.NET MVC 5 | ASP.NET Core