JavaScript AJAX Requests

Ajax asynchronous transfer value in JS

<script type= "Text/javasccript" >

var xmlHttp;

function Createxmlrequest ()

{

IE browser

if (window. ActiveXObject)

Xmlhttp=new ActiveXObject ("Microsoft.XMLHTTP");

Non-IE browser

else if (window. XMLHttpRequest)

Xmlhttp=new XMLHttpRequest ();

}

function Startreadystate ()

{

Createxmlrequest ();

Xmlhttp.onreadystatechange=handlerstatechange;

Xmlhttp.open ("GET", "default.aspx?") Name= "+escape (document.getelementbyidx_x_x (" Txtname "). Value), true);

Xmlhttp.send (NULL);

}

function Handlerstatechange ()

{

if (xmlhttp.readystate== "4" && xmlhttp.status== "200")

{

if (xmlhttp.responsetext== "Zhangsan")

{

Document.getelementbyidx_x_x ("Label1"). Innertext=xmlhttp.responsetext;

}

}

}

</script>

Note:

GET:

Returnmethod method that is called after a successful return

Xmlhttp.onreadystatechange=returnmethod;

Xmlhttp.open ("GET", "default.aspx?") Name= "+escape (name), true);

Xmlhttp.send (NULL);

POST:

var para= "Name=" +escape (Name);

Xmlhttp.onreadystatechange=returnmethod;

Xmlhttp.open ("POST", "default.aspx", true);

To use post async be sure to add the following statement

Xmlhttp.setrequestheader ("Content-type", "application/x-www-form-urlencoded;");

Xmlhttp.send (para);

In the Default.aspx.cs page

If using the post asynchronous value, want to use ResponseText in JS to receive the value,

Must be clear first with response.clear ()

Response.Write ("Zhangsan");

Then use Response.End () to output from memory;

With get asynchronous handed down also can not response.clear ();

JavaScript AJAX Requests