Net equivalent to Ajax effect icallbackeventhandler

For more in-depth reference and research, you can refer to the following
Http://msdn2.microsoft.com/zh-cn/library/ms178210%28vs.80%29.aspx http://tech.sina.com.cn/s/2006-04-20/1522911788.shtml http://tech.sina.com.cn/s/2006-04-20/1522911789.shtml

First, it is built on the web page. Open vs2005 or later and create a website

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1. Drag and Drop a static control, button, and callback <button onclick = "Callback ();"> test the Ajax effect </button>

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2. Write the callback function in JavaScript on the page.

Code executed in Javascript

1 < Script Type = " Text/JavaScript " >
2 // Onclick event started!
3 Function Callback ()
4 {
5 // ARGs is a variable that will be used for asynchronous processing.
6 VaR ARGs = " On the website, you need to perform Ajax and asynchronous variables, and finally input them to the background for receiving and processing. " ;
7 // The args variable is used now. receivedata is returned to the client, that is, the user's result.
8 <% = Clientscript. getcallbackeventreference ( This , " ARGs " , " Receivedata " , Null ) %>
9 }
10 // This is the final execution.
11 // The data here is not visible in the background. The returned results are returned after the server processes the data.
12 Function Receivedata (data)
13 {
14 // You can write it as needed.
15 Alert (data );
16 }
17
18 < / SCRIPT>

3. Let's go to the background to see what the background receives.

Before writing, make preparations and first implement the icallbackeventhandler interface.

It automatically generates its own internal Method

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Code

1 # Region Icallbackeventhandler Member
2
3 Public   String Getcallbackresult ()
4 {
5 Return   "" ;
6 }
7
8
9 Public   Void Raisecallbackevent ( String Eventargument)
10 {
11
12 }
13
14 # Endregion

4. define a global variable for processing

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Code

1 Private   String Callserverdata = String . Empty;
2 # Region Icallbackeventhandler Member
3
4 // He will use the passed results as the receivedata (data) parameter in the receivedata function just now ),
5 // Equivalent to data = getcallbackresult ()
6 Public   String Getcallbackresult ()
7 {
8 Return Callbackvaue +   " OK! " ;
9 }
10
11
12 Public   Void Raisecallbackevent ( String Eventargument)
13 {
14 This . Callserverdata = Eventargument;
15 // Remember that eventargument is the value of the ARGs variable at the front end.
16 // After receiving ARGs ---> eventargument ----> callserverdata
17 }
18
19 # Endregion

Summary:

The Calling sequence of the entire process is as follows: (foreground)Callback() -->

(Background) icallbackeventhandler. raisecallbackevent (string eventargument) -->

(Background) icallbackeventhandler. getcallbackresult () -->

(Front-end) receiveserverdata (string value ).

 

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