asp.net – WebForm_DoCallback定义

有关WebForm_DoCallback功能的MSDN的简单说明吗？

我可以找到的是这篇文章http://msdn.microsoft.com/en-us/magazine/cc163878.aspx
其中包括WebForm_DoCallback的实现,但是不能很好地解释参数本身.

function WebForm_DoCallback(eventTarget,eventArgument,eventCallback,context,errorCallback)

像什么是“eventTarget”呢？
什么是“上下文”？
等等…

解决方法

target: The name of a server Control that handles the client
callback. The control must implement
the ICallbackEventHandler interface
and provide a RaiseCallbackEvent
method.

argument: An argument passed from the client script to the server
RaiseCallbackEvent method.

clientCallback: The name of the client event handler that receives the
result of the successful server event.

context: Client script that is evaluated on the client prior to
initiating the callback. The result of
the script is passed back to the
client event handler.

clientErrorCallback: The name of the client event handler that receives
the result when an error occurs in the
server event handler.

useAsync: true to perform the callback asynchronously; false to
perform the callback synchronously.

clientCallback和clientErrorCallback是客户端(通常是JavaScript)函数,参数的格式如下：

function clientCallback(returnmessage,context) {}

其中returnmessage是来自服务器的响应(或错误),上下文与之前传递的上下文相同.

参考文献：

MSDN: ClientScriptManager.GetCallbackEventReference Method

MSDN Magazine: Implications of Script Callbacks in ASP.NET

ESRI Developer Network: Page Postbacks and Client Callbacks

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