javascript controls disappear

[omlac]

im creating controls using javascript, but whenever there is a postback on the page all the controls created in javascript disappear.
How do i fix this problem.
the code below shows how im creating them.

var txt5   = document.createElement("input");
              txt5.setAttribute ('type', 'text');
              txt5.setAttribute ('id', j[0]);
              txt5.setAttribute ('name', j[0]);
              txt5.setAttribute ('text', j[0]);
              var chk1 = document.createElement("input");
              chk1.setAttribute ('type', 'checkbox');
              chk1.setAttribute ('id', "chk" + j[0] );
              chk1.setAttribute ('name',"chk" +  j[0]);
              chk1.setAttribute ('text',"chk" +  j[0]); 
              //chk1.innerHTML  = "Default";
              var lbl1   = document.createElement('label');
              lbl1.setAttribute ('id', "lblDefault" );
              lbl1.innerHTML =  "Default";
              lbl1.style.width = "30px";
              var lbl3   = document.createElement('label');
              lbl3.setAttribute ('id', "lbl" + j[0]);
              lbl3.innerHTML =  j[0];
              lbl3.style.width = "125px";              
              txt5.style.top='15px';
              txt5.style.left='15px';
              var newdiv = document.createElement('div');
              di.setAttribute('id',"divIdName");                            
              di.appendChild(lbl3);
              di.appendChild(txt5);

[acoder]

You need to recreate them using the same code on page load.

[omlac]

i added this line on init but it just runs trough the line and doesnt call the java function when its a postback, it only run once(the first time)

ClientScript.RegisterStartupScript(Me.GetType(), "ctrScript", "<script language = 'javascript'>LoadControls('" & strParams & "')</script>")

Thanks

[acoder]

I'm not sure about ASP.NET, but in JavaScript you can use window.onload or event listeners, e.g.

if (window.addEventListener)
    window.addEventListener("load", LoadControls, false);
else if (window.attachEvent)
    window.attachEvent("onload", LoadControls);
else 
    window.onload= LoadControls;

[omlac]

thanks,
my function loadcontrols has a parameter strParams which is generated in code behind(either onload or on init). do u thinki will be able to pass this parameter if i useevent listners.

Thanks

[acoder]

Use a function() object:

if (window.addEventListener)
    window.addEventListener("load", function() { LoadControls(params); }, false);
else if (window.attachEvent)
    window.attachEvent("onload", function() { LoadControls(params); });
else 
    window.onload= function() { LoadControls(params); };

[omlac]

thanks, it worked, that fixed it

[acoder]

That's cool. Thanks for posting.

[Frinavale]

I have no idea why you are doing what you are doing....

I just wanted to mention that if you plan on using Ajax in your asp web application you should register your scripts with the ScriptManager instead of the Page.ClientScript....

I'm not even sure your code would work in an Ajax solution...so don't mind me.