Ajax application method summary

Note: Ajax serves as a bridge between the front-end and the back-end. You can call the back-end method at the front-end.

The dll can be downloaded from the Ajax. dll file.

Configuration:

Step 1: Configure in webconfig:

<System. Web>
<Httphandlers>
<Add verb = "post, get" Path = "ajax/*. ashx" type = "Ajax. pagehandlerfactory, Ajax"> </Add>
</Httphandlers>

 

Step 2: register on the referenced page:

Ajax. Utility. registertypeforajax (typeof (addnews ));

Addnews is the name of the page.

 

Step 3: declare before the called method:

 

When you do not need to perform session operations: [Ajax. ajaxmethod ()]

When session operations are required: [Ajax. ajaxmethod (Ajax. httpsessionstaterequirement. readwrite)]

 

Application:

Step 1: Define the background method:

/// Obtain the category
/// </Summary>
/// <Param name = "E"> </param>
[Ajax. ajaxmethod ()]
Public dataset getcatogory ()
{
Database. dboperation DB = new database. dboperation ();

String strsql = "select catogoryname from tb_newscatogory order by ID ";
DS = new dataset ();
DS = dB. getdataset (strsql );
Return Ds;
}

 

Step 2: Call JS at the front end:

VaR DS = addnews. getcatogory (). value;

Addnews is the name of the registration page

 

Note:

1. The JS reference statement must be in the <form>... </form> block.

2. the method defined in the background must be of the Public type.