The BootstrapComboBox editor combines the functionality of a single-line text editor, button editor, and dropdown list editor. The editor's dropdown displays a list of items that can be selected by end-users.
Bootstrap Combo Box offers the following features.
Data-Bound and Unbound Modes Support
Editor content can be generated dynamically by binding the editor to a data source, as well as manually populating the control's item collection. When retrieving items from the data source, item characteristics such as the text, value, and image are obtained from specific data fields. These data fields can be either defined manually using an item's FieldName property or are obtained automatically, provided that the data fields in the data source are named like the item's characteristics (Text, ImageURL, Value).
Three Item Loading Modes
The Bootstrap Combo Box control supports three item loading modes.
All items are loaded to the client side, so all data operations (such as scrolling, filtering) are performed on the client, without generating a round trip to the server.
Items are loaded from the server on demand using callbacks. For instance, list items that are not currently displayed within the editor's dropdown window can be dynamically loaded when an end-user scrolls the list. This callback mode forces the first page load much faster, since only a few items need to be initially loaded.
EnableCallbackMode = "True"
You can manually populate a dropdown list with the required item portions, based on the currently applied filter criteria (the ASPxAutoCompleteBoxBase.IncrementalFilteringMode property value is other then "None") and the list scrolling performed.
You can enable your end-users to filter list items dynamically, based upon the text typed into the editor's input box on the client side (find-as-you-type filtering). The following filter modes are available.
The editor is filtered for list items that begin with the search string.
The editor is filtered for list items that contain the search string. The found search string is highlighted within items for clarity.
You can define the time interval between the time a user starts typing within the editor's edit box (the ASPxAutoCompleteBoxBase.IncrementalFilteringDelay property) and the time filtering is applied. Moreover, when the Bootstrap Combo Box editor is in incremental filtering mode, it has the capability to start filtering only after an end-user has typed a specific number of symbols in the editor's text box (see the ASPxAutoCompleteBoxBase.FilterMinLength property).
Editor display values can be formatted using the standard formatting mechanism. The ASPxAutoCompleteBoxBase.TextFormatString property allows you to define the pattern used to format the selected item's text displayed within the editor's edit box.
You can define images for individual items (see the BootstrapListEditItem.IconCssClass property). Images associated with list items are displayed within the editor's dropdown list. The selected item image can be displayed within the editor's edit box in addition to the text.
The Bootstrap Combo Box control provides a collection to maintain its custom edit buttons. Each button exposes a set of properties allowing the button's appearance and behavior to be defined. The settings of the default button, which invokes the dropdown window when clicked, can be customized as well.
The Bootstrap Combo Box control allows you to perform data validation both on the client and server side.
Full-Featured Client-Side API
You can modify the editor behavior using the following methods.