Although I used Ajax in the past, I always felt that it was wrong. In the past, Ajax was used to request the ASPX page. There were countless pages and I felt quite confused.
In my recent work, I also felt that my colleague's jquery + ashx was quite simple and convenient to use. I made a small demo here.
<% @ Page Language = "C #" autoeventwireup = "true" codefile = "ajaxget. aspx. cs" inherits = "ajaxget" %>
<! Doctype HTML public "-// W3C // dtd xhtml 1.0 transitional // en" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<HTML xmlns = "http://www.w3.org/1999/xhtml">
<Head runat = "server">
<Title> No title page </title>
<SCRIPT type = "text/JavaScript" src = "Misc/JS/jquery-1.2.6.js"> </SCRIPT>
</Head>
<Body>
<SCRIPT type = "text/JavaScript" Language = "JavaScript">
Function getcategorydata (type)
{
Alert ("Test start ");
$. Ajax ({
Type: 'get ',
URL: 'ajaxservice/handler. ashx ',
Datatype: 'text ',
Data: 'Type = '+ type,
Success: function (MSG)
{
Alert (MSG );
$ ("# Category" pai.html (MSG );
},
Error: function (data ){
Alert (data );
}
})
}
</SCRIPT>
<Form ID = "form1" runat = "server">
<Div>
<Input type = "radio" value = "1" name = "wangtao" onclick = 'getcategorydata (this. Value) '/>
<Input type = "radio" value = "2" name = "wangtao" onclick = 'getcategorydata (this. Value) '/>
<Select id = "category">
</SELECT>
</Div>
</Form>
</Body>
</Html>
The front-end page is very simple, that is, two radio and one select. Put the value of the selected radio in the SELECT statement.
Background ashx code
<% @ Webhandler Language = "C #" class = "handler" %>
Using system;
Using system. Web;
Using system. text;
Public class handler: ihttphandler {
Public void processrequest (httpcontext context ){
Stringbuilder strbul = new stringbuilder ();
Strbul. append ("<option value = 'wangta'> ");
Strbul. append (context. Request. Params ["type"]. tostring ());
Strbul. append ("</option> ");
Context. response. contenttype = "text/html ";
Context. response. Write (strbul. tostring ());
}
Public bool isreusable {
Get {
Return false;
}
}
}
Although it is very simple, it can be used to give everyone an alternative.
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