AJAX: I am unable to fetch the data from server side - ajax

Question

I need to get output from my server side code but i am able to fetch it.
I have used script manager and script manager proxy control in master page.
How can i get the string that is being returned from the cs file
Here is my Default.aspx code
<asp:UpdateProgress runat="server">
<ProgressTemplate >
Loading..........
</ProgressTemplate>
</asp:UpdateProgress>
<asp:UpdatePanel runat="server">
<ContentTemplate>
<asp:Label ID="lbl" Text="Enter Your Name" runat="server"></asp:Label>
<input type="text" id="txt" /><br />
<input type="button" id="btn" value="Submit" onclick="makeGetRequest()" />
<div id="description">Hello</div>
</ContentTemplate>
</asp:UpdatePanel>
<script language="Javascript" type="text/javascript" >
function createRequestObject() {
var tmpXmlHttpObject;
if (window.XMLHttpRequest) {
// Mozilla, Safari would use this method ...
tmpXmlHttpObject = new XMLHttpRequest();
} else if (window.ActiveXObject) {
// IE would use this method ...
tmpXmlHttpObject = new ActiveXObject("Microsoft.XMLHTTP");
}
return tmpXmlHttpObject;
}
var http = createRequestObject();
function makeGetRequest() {
http.open('post', 'Default.aspx/greet',true);
//assign a handler for the response
http.onreadystatechange = processResponse;
//actually send the request to the server
http.send(null);
}
function processResponse() {
if (http.readyState == 4) {
var response = http.responseText.toString();
alert("Inside here before");
document.getElementById('description').innerHTML = response;
alert("Inside here after");
}
}
</script>
// my default.aspx.cs file
[WebMethod(EnableSession=false)]
public static string greet()
{
return "hello";
}
I am getting all contents of the page copied instead of getting response from it

Answer 1

the line var http = createRequestObject(); have to be the first line inside function makeGetRequest() function. anyway, i am posting a working code.
<script language="Javascript" type="text/javascript" >
function makeGetRequest() {
var http;
if (window.XMLHttpRequest) {
http = new XMLHttpRequest();
} else if (window.ActiveXObject) {
http = new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange = function () {
if (xmlhttp.readyState == 4) {
var response = http.responseText.toString();
alert("Inside here before");
document.getElementById('description').innerHTML = response;
alert("Inside here after");
}
}
http.open('post', 'Default.aspx/greet', true);
http.send(null);
}
</script>