Simple examples and notes of Ajax. Net pro

★BackgroundCodeAs follows:
Bytes -----------------------------------------------------------------------------------------------------------

1 Public Partial Class Ajaxpro_example_default: system. Web. UI. Page
2 {
3
4 Protected   Void Page_load ( Object Sender, eventargs E)
5 {
6Ajaxpro. Utility. registertypeforajax (Typeof(Ajaxpro_example_default ));//You must ensure that this registration statement is executed every time you send the message back.
7}
8
9 [Ajaxpro. ajaxmethod]
10 Public Datetime getservertime ()
11 {
12ReturnDatetime. now;
13}
14 }

★The front-end code is as follows: after the page is loaded, the time is acquired from the server every second and displayed in divmsg on the aspx page.
Bytes ----------------------------------------------------------------------------------------------------

1 < Head runat = " Server " >
2 < Title > No title page </ Title >
3 < Script Type = " Text/JavaScript " >
4 Function getservertime ()
5 {
6 // Ajaxpro_example_default.getservertime (getservertime_callback ); // Asynchronous call comment out: original code in the example
7
8 Window. setinterval ( " Ajaxpro_example_default.getservertime (getservertime_callback) " , 1000 ); // Call once every second
9 }
10
11 // Callback Function
12 Function getservertime_callback (RES)
13 {
14 // Alert (res. value ); // Comment out: original code in the example
15 Document. getelementbyid ( " Divmsg " ). Innertext = Res. value; // Add the time value to the DIV for rendering.
16 }
17
18 Window. onload = Getservertime; // Executed during page loading
19
20 </ Script >
21 </ Head >
22 < Body >
23 < Form ID = " Form1 " Runat = " Server " >
24 < Div ID = " Divmsg " Style = " Width: 100px; Height: 100px " >
25 </ Div >
26 </ Form >
27 </ Body >
28 </ Html >

★Several important points worth attention:
Bytes ----------------------------------------------------------------------------------------------------
1. It must be used in Web ApplicationsProgramIn the Web. config file under the root directory<System. Web>Add:
<Httphandlers>
<Add verb = "post, get" Path = "ajaxpro/*. ashx" type = "ajaxpro. ajaxhandlerfactory, ajaxpro.2"/>
</Httphandlers>

2. The server must register classes that contain methods in page_load, and ensure that the registration statement is executed every time the page is sent back.
It cannot be written as follows:
If (! Ispostback)
{// The registration statement cannot be written here. Otherwise, the client will not be able to access the ajaxpro_example_default class after the page is sent back.
Ajaxpro. Utility. registertypeforajax (typeof (ajaxpro_example_default ));
}

3. The server is only used[Ajaxpro. ajaxmethod]The method marked before it can be called by the client

4. The client page must contain<Form runat = "server">Mark. Otherwise, you cannot access the registered classes on the server.

★Regret:
Bytes ----------------------------------------------------------------------------------------------------
It cannot be called across pages. You can only access the registered class or method on the foreground page associated with the descendant CS, if it can be in one place (such as in the global file) register all the objects that need to be accessed at the front end, and the registered objects can be accessed on any HTML or ASPX page at the front end, which is more convenient and flexible.