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 kind of HTML you may want to have 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

Telerik ASP.NET AJAX ComboBox 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 (ObjectDataSource, XmlDataSource, SqlDataSource, etc.) as well as all datasources introduced in .NET 3.5 (LinqDataSource, EntityDataSource, ADO.NET DataServices, etc). The control can also be bound to web services on the client and load data on demand which results in previously unattainable performance improvements.

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Rich Client-side API

Telerik ASP.NET AJAX ComboBox 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, or 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 user experience.

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Load-on-Demand

RadComboBox provides its own Load-On-Demand mechanism - the RadComboBox waits until it needs to display additional items to actually load any items (initial load, or subsequent loads).. The ASP.NET AJAX ComboBox also provides an option to cache the items loaded on demand. Automatic load on demand with all kinds of data sources including .NET 3.5's LINQ and EntityDataSource is also supported.

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Powerful Autocomplete

RadComboBox for ASP.NET AJAX has full autocomplete support - while you type into the input area, the text will be autocompleted to the first matching item. ComboBox also supports autocomplete for multiple items using any delimiter (";" , ",", etc.) - just like in Microsoft Outlook®.

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Filtering and Sorting

Telerik ASP.NET AJAX ComboBox supports client-side filtering which allows end users to initiate fast search among all items without going to the server. This 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. Custom sorting of combobox items is supported as well.

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Multicolumn Mode Combobox

RadComboBox provides support for multiple columns. 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 AJAX ComboBox also supports static column headers which are always visible and do not scroll away when combobox items go up and down. Through headers you can assign column titles for each combo column and end-users can easily associate column data to its respective column title in the header.

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Overlay Support

RadComboBox fully supports overlay. Its drop-down can hover over windowed objects like HTML select boxes, Flash movies, and so on. This is a built-in feature and no property needs to be set in order to enable it.

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Screen Boundaries Detection

Telerik ASP.NET AJAX ComboBox automatically detects browser boundaries and the drop-down will be opened in the opposite direction if the window edges are to be crossed.
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Template Support

RadComboBox fully supports templates. You can embed any content inside a RadComboBox template, like HTML markup, ASP.NET server controls, and other third party controls (including any control from the Telerik RadControls suite). RadComboBox supports global template as well which affects the appearance of all items in the control.

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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 to your scenario: additional text, values or images for example.

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Animations

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

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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
- Template Design Surface for designing item, header and footer templates
- 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.

You can additionally 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 and Accessibility Standards Compliancy

RadComboBox for ASP.NET AJAX is completely compliant with the XHTML 1.1 requirements. ComboBox follows Section 508 compliance and falls under the W3C Compliance Level “A”, as defined by the W3C Web Content Accessibility Guidelines 1.0/2.0. RadComboBox also has full support for keyboard navigation with Shortcuts, Access Keys and Arrow-key navigation.

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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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VS Plug-in for Testing RadControls

Telerik's automated software testing tool Test Studio employs a rich set of features to help you automate AJAX-intense web content. You can test complex UI actions like drag-and-drop, invoke JavaScript functions from your test code, and perform logging actions. Additionally, the test recorder makes it easy to wait on AJAX operations before executing a specific verification. What’s more, Test Studio is the best way to test RadControls for ASP.NET AJAX. The powerful test recorder automatically detects the controls and exposes commonly used verifications. Learn more
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