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Angular 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.

import { DxLookupModule } from "devextreme-angular"

Selector: dx-lookup

Configuration

An object defining configuration properties for the Lookup UI component.

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.
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 `name` attribute of the underlying HTML element.
nextButtonText	The text displayed on the button used to load the next page from the data source.
noDataText	Specifies 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.
useItemTextAsTitle	Specifies whether the Lookup uses item's text a title attribute.
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.

Methods

This section describes the methods that control the Lookup UI component.

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 `<input>` element.
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 a property to its default value.

Events

This section describes events fired by this UI component.

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.

Angular Lookup API

See Also

Configuration

See Also

Methods

See Also

Events

See Also