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 End-User Documentation
View this topic on docs.devexpress.com (Learn more)

LookUpEdit Class

The editor that provides lookup functionality using a lightweight grid in a drop-down window.

Namespace:DevExpress.XtraEditors
Assembly:DevExpress.XtraEditors.v19.2.dll

Expanded Syntax

Expanded Remarks

Demo: LookUp Edit module in the XtraEditors MainDemo

A lookup editor is an editor with an embedded dropdown window, which displays lookup records (the records from which an end-user can select). When a lookup record is selected, the editor's value (the BaseEdit.EditValue bindable property) and display text are modified accordingly.

The LookUpEdit presents lookup records as a lightweight grid control.

To present lookup records using a feature-rich GridControl, use the GridLookUpEdit or SearchLookUpEdit control instead.

To learn how to set up lookup editors in different binding modes, see the following topics:

You may want to filter the popup data source of one (secondary) lookup editor based on the value of another (primary) lookup editor. This scenario is covered in the following topic:

Expanded Additional Customization

The following list shows some of the members that help you perform the additional customization of the LookUpEdit control.

To embed a LookUpEdit in a cell within a container control (XtraGrid, XtraTreeList, etc), use the RepositoryItemLookUpEdit component. See the Repositories and Repository Items topic, for more information.

Expanded Item Search

If you want users to be able to search for lookup items, change the (RepositoryItemLookUpEdit.SearchMode property to either AutoSuggest or AutoSearch. The RepositoryItemLookUpEdit.TextEditStyle property automatically switches to Standard when you select either of these modes.

Difference between AutoSearch and AutoSuggest modes:

  • AutoSuggest runs a custom Task to return a collection of items for the drop-down panel. As a result, the editor has a virtual data source that changes every time a user text changes. This mode is primarily used with unbound editors.

  • AutoSearch uses the default search logic to find required items in the data source to which this lookup is bound.

  • AutoSearch mode is not currently available with server-mode editor sources.

Both modes are available for stand-alone editors only.

Expanded AutoSuggest Mode

When a user types in text, the editor fires the AutoSuggest event (AutoSuggest \ GridLookUpEdit.AutoSuggest) that runs a custom asynchronous task (a System.Threading.Tasks.Task object). This task performs a search against the given data set, and returns the ICollection object with records that match the entered text. This collection is automatically assigned to the editor's DataSource and its entries appear in the editor drop-down menu.

This feature is in effect only for stand-alone editors.

AutoSuggest event parameters provide the following API.

To test the AutoSuggest mode, run the AutoSuggest Lookup Demo Center module. You can click the "Open Solution" Ribbon button to view the complete demo code.

In this demo, suggestions (drop-down menu items) are retrieved on the QueryAsync task. The SetMinimumAnimationDuration method ensures the loading indicator is visible for at least one second.

The code below demonstrates how this QueryAsync Task is implemented. The EnsureAllEntries method retrieves all locations from the source. If a user opens the editor drop-down menu, all these entries are visible. Otherwise, the method compares user text with data source records.

In this demo, the data source is the "Data\cities.csv" Excel file that stores nearly 13.000 city names. Each record also contains country and state names, country UN code, and Unicode city name. All records are extracted inside the custom Entry class.

The Entry class contains data fields for Excel file columns, plus additional data fields for values combined from standard fields.

  • Tags - a portion of a record to be checked against an entered user text: City, Unicode City Name, and State Name;
  • Text - full location address in the "CountryName, CityName, StateName" format.
  • HtmlText - same as Text, but country name is written with a grayed-out text. This field is used to custom draw lookup items (see the "Additional Customization" section below).

Custom Item Draw

The HtmlText property decalred in the Entry class is optional - it is not required to implement the auto-suggest functionality. This property is used to manually re-paint lookup items so that country names appear washed out. To do that, handle the RepositoryItemLookUpEdit.CustomDrawCell event.

Custom Highlight Ranges

The QueryAsync Task compares user text with the entry Tags property. This property includes city name, city unicode name, and state name - country names are ignored. For example, the figure below illustrates that the demo database contains many Mexican cities.

If a user enters "ex", from all Mexican cities only "Mexicali" and "Mexico City" remain visible - the Task behaves correctly and filters out non-matching records. However, although the Task ignores countries, the editor highlights "ex" in country names as well.

This happens because there are two separate processes that take place in a lookup editor.

  1. A Task assigned to the QuerySuggestions property scans the data source and chooses records to show in a drop-down menu.
  2. A lookup editor scans items returned by the Task, and looks for user text matches.

If these two processes use different algorhythms, a misleading highlight behavior similar to that mentioned above may happen. If that happens, define custom highlight range(s) with the SetHighlightRange \ SetHighlightRanges methods. The demo code below uses the same logic as in the QueryAsync task to provide correct ranges.

The AutoSuggest event parameter offers a number of methods that you can use to define custom highlight ranges.

Expanded AutoSearch Mode

The AutoSearch mode allows users to search for required data source items.

Change Search Logic

Handle the AutoSearch event (AutoSearch \ GridLookUpEdit.AutoSearch) and use a SetParameters (see LookUpEditAutoSearchEventArgs.SetParameters) method overload to specify how the editor should compare user text with editor items.

  • parserKind parameter - specifies how user text parts divided by a space character should be combined (see the ColumnViewOptionsFind.ParserKind property for examples).
  • condition parameter - specifies which function should be used to build filter expressions (see the ColumnViewOptionsFind.Condition Data Grid property for examples).
  • field or fieds[] parameter - allows you to limit the search by specific data fields only.
  • text parameter - allows you to replace the user text.

The example below illustrates how to make the editor look for items whose text starts with the user text.

Custom Text Highlight Ranges

Lookup editors highlight text portions that match user text. Handle the AutoSearch event to provide custom highlight ranges. This mode uses same highlight API as the AutoSuggest mode does.

The example below illustrates how to make a lookup editor highlight the entire field value if it starts with user text.

Expanded Example

The following example shows how to use a standalone LookUp editor to select a city from a dropdown list.

The example performs the following:

  • creates two lists (Persons and Cities) that contain Person and CityInfo objects. Each Person object is linked to a CityInfo object using the Person.CityID and the matching CityInfo.ID field.
  • uses the TextEdit and LookUpEdit controls to edit the Person.Name and Person.CityID properties, respectively.
  • uses a DataNavigator control to navigate between the Persons list items.
  • sets up the lookup data source to display the Cities list
  • handles the RepositoryItem.CustomDisplayText event to display the CityInfo.City and CityInfo.Country field values in the edit box. If this event is not handled, the edit box displays the RepositoryItemLookUpEditBase.DisplayMember property's value (CityInfo.City).

Expanded Example

This example shows how to use an in-place LookUpEdit control (RepositoryItemLookUpEdit) for editing cells in a grid column.The lookup editor in the example is used to edit the CategoryID field values from the Products list. However, instead of displaying category IDs, the editor will display corresponding category names in the edit box.The main properties used to set up the LookUpEdit control are:- DataSource - Specifies the lookup data source.- ValueMember - Specifies the field from the lookup data source whose values match the editor's edit value.- DisplayMember - Identifies the field from the lookup data source whose values match the editor's display text.

The following image shows the result.

Expanded Inheritance Hierarchy

System.Object
    System.MarshalByRefObject
       System.ComponentModel.Component
          System.Windows.Forms.Control
             ControlBase
                BaseControl
                   BaseEdit
                      TextEdit
                         ButtonEdit
                            PopupBaseEdit
                               PopupBaseAutoSearchEdit
                                  LookUpEditBase
                                     LookUpEdit
                                        TimeZoneEdit

Expanded See Also

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