ComboBox for ASP.NET AJAX

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Overview

A good dropdown control should be able to render more than simple string values, meaning any HTML you want in the drop down list. That’s exactly what the Telerik Combobox control allows you to do. From multi-column support to template support, anything you need in a drop down can be rendered in RadCombobox. All this flexibility comes packaged in a control that renders lightweight, semantic HTML for optimum page performance and SEO.

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Features

Semantic Rendering for Minimal HTML

The Telerik ASP.NET Combobox control implements a highly efficient semantic rendering, which uses list items and CSS instead of tables. As a result the HTML output is significantly reduced, which dramatically improves performance.

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Powerful Databinding

RadComboBox for ASP.NET AJAX has a flexible databinding mechanism including support to all ASP.NET 2.0 declarative datasources (AccessDataSource, ObjectDataSource, SqlDataSource, SiteMapDataSource, XmlDataSource) as well as the new LinqDataSource. The control can also be bound to web services on the client and load data on demand which results in previously unattainable performance boosts.

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Rich Client-side API

The ASP.NET ComboBox control by Telerik has a rich client-side API and comprehensive set of events guaranteeing full control over various functions performed on the client. You can easily add/delete/update items at the client side and all the changes will be persisted on the server as well. The rich client-side API provides unbeatable performance and desktop-like experience.

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Load-on-Demand

RadComboBox provides its own Load-On-Demand mechanism - you can set a poll-server timeout and the combobox fires a server-side event (ItemsRequested) that returns combobox items based on the current text. The Telerik ASP.NET ComboBox also provides an option to cache the items loaded on demand.

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Powerful Autocomplete

RadComboBox for ASP.NET AJAX has full autocomplete support - while you type into the input area, the combobox returns all the relative matches for the currently typed text. Autocomplete for multiple items using any delimiter (";" , ",", etc.) is also supported - just like in Microsoft Outlook®.

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Filtering and Sorting

The Telerik ASP.NET ComboBox control now supports client-side filtering which means that end users are able to initiate fast search among all items without going to the server. The latter ensures unmatched loading speed even when handling lots of records. In addition, automatic ascending and descending sorting based on the text property of the control is also available.

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Multicolumn Mode Combobox

Multi-column mode supports all advanced AJAX features of the combo – load on demand, auto-complete, etc. Items loaded on demand are automatically formatted using the templates as well. The Telerik ASP.NET ComboBox also supports static column headers: through headers you can assign column titles for each combo column. The header does not scroll when items go up/down and is always visible – end-users can easily associate column data to its respective column title in the header.

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Custom Attributes

RadComboBox provides full support for custom attributes both on the server and on the client. It is easy to customize the item and include any attribute relevant for your scenario: additional text, value or image.

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Template Support

RadComboBox fully supports templates. You can embed any content inside a RadComboBox template, including HTML markup and ASP.NET server controls, as well as other third party controls (and actually any control from the Telerik RadControls suite as well). The syntax is very similar to what you're used to from the default DataGrid control. If you do not specify an ItemTemplate, all RadComboBox items are rendered using their Text property as plain text. If you specify <ItemTemplate>, then the respective template is used for rendering.

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Extensive VS.NET Design-time Support
The ASP.NET ComboBox control provides rich design time support functionality making customizations and configurations very easy. Some of the key capabilities are:
- Applying skins in design time and easily switching between them - the Choose Skin command in RadComboBox Smart tag automatically detects the preset skins
- Item Builder dialog for easy inline creation
- Design-time support for declarative data sources
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Search Engine Friendly

RadComboBox completely follows the principles of Search Engine Optimization. The control's innovative rendering generates semantic lists and standard tags, which are properly recognized and highly valued by search engines. As a result, all content accessible through this control will be automatically indexed and ranked with no extra effort required from the developer.
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Validation

You can use the built in ASP.NET validation with RadComboBox - simply make sure you set the ControlToValidate property of the respective validator to the ID of the RadComboBox instance.

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Additionally, you can create Validation Groups. Simply, assign a group name to a set of validators to ensure that validation occurs only for controls in the specified group. This enables you to have multiple separately-validated forms on a single page.

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Right to left support

RadComboBox provides full support for Right-to-Left languages.

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XHTML Standards Compliancy

Telerik ASP.NET AJAX ComboBox is compliant with the XHTML 1.1 requirement. RadComboBox also has full support for keyboard navigation with Shortcuts, Access Keys and Arrow-key navigation.

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Animations

RadComboBox supports a variety of expand animation styles for a great user experience. You can select among predefined animations and further customize them with any settings relevant for your scenario.

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Appearance

Telerik ASP.NET AJAX ComboBox is shipped with a rich set of skins that allow you to easily build slick interfaces with the look-and-feel of Windows Vista, Office 2007, Outlook, etc. The skins can be easily switched using a single property.

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