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dopostbak event

Posted on 2006-07-13
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Last Modified: 2012-08-14
Hi All,

Is it possible to catch asp.net's do postback event in javascript?

I have the following code that opens and collapses a <div>;-

<script language="JavaScript" type="text/javascript">
  var openedObj = false;
  function toggleDisplay(id)
    {
    obj = document.getElementById(id);
    if (obj.style.display == "none")
    {
           if(openedObj) openedObj.style.display = "none";
           obj.style.display = "";
           openedObj = obj;
    }
    else
    {
          obj.style.display = "none";
    }
  }
</script>

But when a user is sorting or paging the Gridview within the <div>, I don't want the <div> ton collapse so I need to ensure that the above code is not executing if its a dopostback event, is this possible?
0
Comment
Question by:claracruz
  • 2
  • 2
4 Comments
 
LVL 9

Expert Comment

by:jonorossi
ID: 17105850
The ASP.NET IsPostBack property tells you if there was a postback. A postback is defined as a request back to the server that uses the POST HTTP method. Client side JavaScript runs on the user's web browser and cannot interact with events that occur on the server. You however could look at using AJAX for sorting and paging of your gridview; one product you might have heard of is Microsoft Atlas which is very easy to achieve what you want with an UpdatePanel.

Hope that helps, Jono
0
 
LVL 4

Author Comment

by:claracruz
ID: 17106755
Atlas is not an option at th moment, I can't get my head around it and am pressed for time on this.

Is there a simple way of going about this in c#

in asp, I was able to use the GetXmlHttpObject, is this possible in asp.net, like so


      function setAccessoryOptions(locker_option_id)
      {
      var url="setaccessoryopt.asp?sid=" + Math.random() + "&o=" + locker_option_id
      //alert(url)
      xmlHttp=GetXmlHttpObject(stateChanged)
      xmlHttp.open("GET", url , false)
      xmlHttp.send(null)
      }

function stateChanged()
{
        if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
        {
              ///do stuff
         }

}

will it follow the same priciple,
0
 
LVL 9

Accepted Solution

by:
jonorossi earned 500 total points
ID: 17106805
Atlas is one of the most simplest AJAX frameworks out there, it takes 2 seconds to throw an UpdatePanel around your current controls and it just works, you don't have to make web services and the likes (thats the other option with Atlas). You might want to take a look at one of the videos about Atlas at atlas.asp.net or on channel9.msdn.com

However, you can use the HttpXmlRequest object just like in ASP; this object runs on the clients web browser. The HttpXmlRequest is the core to AJAX and is what all AJAX frameworks use including Atlas.

Hope that helps
0
 
LVL 4

Author Comment

by:claracruz
ID: 17110731
ok, will give it a shot!!! cheers!
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