<! Doctype html public "-// W3C // dtd html 4.01 Transitional // EN">
<Html> <Script type = "text/javascript">
Var xmlHttp;
Function createXMLHttpRequest (){
If (window. ActiveXObject ){
XmlHttp = new ActiveXObject ("Microsoft. XMLHTTP ");
} Else if (window. XMLHttpRequest ){
XmlHttp = new XMLHttpRequest ();
}
}
Function doStart (){
CreateXMLHttpRequest ();
Var url = "Handler. ashx? Task = reset ";
XmlHttp. open ("GET", url, true );
XmlHttp. onreadystatechange = startCallback;
XmlHttp. send (null );
}
Function startCallback (){
If (xmlHttp. readyState = 4 ){
If (xmlHttp. status = 200 ){
SetTimeout ("pollServer ()", 5000 );
RefreshTime ();
}
}
}
Function pollServer (){
CreateXMLHttpRequest ();
Var url = "Handler. ashx? Task = foo ";
XmlHttp. open ("GET", url, true );
XmlHttp. onreadystatechange = pollCallback;
XmlHttp. send (null );
}
Function refreshTime (){
Var time_span = document. getElementByIdx_x ("time ");
Var time_val = time_span.innerHTML;
Var int_val = parseInt (time_val );
Var new_int_val = int_val-1;
If (new_int_val>-1 ){
SetTimeout ("refreshTime ()", 1000 );
Time_span.innerHTML = new_int_val;
} Else {
Time_span.innerHTML = 5;
}
}
Function pollCallback (){
If (xmlHttp. readyState = 4 ){
If (xmlHttp. status = 200 ){
Var message = xmlHttp. responseXML. getElementsByTagName_r ("message") [0]. firstChild. data;
If (message! = "Done "){
Var new_row = createRow (message );
Var table = document. getElementByIdx_x ("dynamicUpdateArea ");
Var table_body = table. getElementsByTagName_r ("tbody"). item (0 );
Var first_row = table_body.getElementsByTagName_r ("tr"). item (1 );
Table_body.insertBefore (new_row, first_row );
SetTimeout ("pollServer ()", 5000 );
RefreshTime ();
}
}
}
}
Function createRow (message ){
Var row = document. create_rElement ("tr ");
Var cell = document. create_rElement ("td ");
Var cell_data = document. create_rTextNode (message );
Cell. appendChild_xss (cell_data );
Row. appendChild_xss (cell );
Return row;
}
</Script>
</Head>
<Body> <Input type = "button" value = "Launch" id = "go" onclick = "doStart ();"/>
<P> Page will refresh in <span id = "time"> 5 </span> seconds. </p>
<Table id = "dynamicUpdateArea" align = "left"> <tbody> <tr id = "row0"> <td> </tr> </tbody> </table> </body>
</Html>
Server Page
<% @ WebHandler Language = "C #" class = "Handler" %>
Using System;
Using System. Web;
Public class Handler: IHttpHandler {
Private static int counter = 1;
Public void ProcessRequest (HttpContext context ){
String res = "";
String task = context. Request. QueryString ["task"]. ToString ();
String message = "";
If (task = "reset ")
{
Counter = 1;
}
Else
{
Switch (counter ){
Case 1: message = "Steve walks on stage1"; break;
Case 2: message = "iPods rock2"; break;
Case 3: message = "Steve says Macs rule3"; break;
Case 4: message = "Change is coming4"; break;
Case 5: message = "Yes, OS X runs on Intel-has for years5"; break;
Case 6: message = "Macs will soon have Intel chips6"; break;
Case 7: message = "done"; break;
}
Counter ++;
}
Res = "<message>" + message + "</message> ";
Context. Response. ContentType = "text/xml ";
Context. Response. AddHeader ("Cache-Control", "no-cache ");
Context. Response. Write ("<response>" + res + "</response> ");
Context. Response. End ();
}
Public bool IsReusable {
Get {
Return false;
}
}
}
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