The AJAX Control Toolkit
In addition to partial rendering, developers can use control extenders to add a predefined client-side behavior to new and existing ASP.NET controls. A client-side behavior is a block of JavaScript code that adds a new capability to the markup generated by a given ASP.NET control. An extender is basically a server control that emits proper script code—the client behavior—to enhance how a given ASP.NET control behaves on the client. An extender is not simply a custom control derived from an existing control. Rather, it represents a general behavior—such as auto-completion, focus management, generation of popups, and draggability—that can be declaratively applied to various target control types.
For the time being, there's ...
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