java script for runat="server" controls

[raghulvarma]

if I type the code as
[HTML]<input type="text" name="txtbox" >[/HTML]
and make the script language as

function empty()
    {
      if(document.Form1.txtbox.value=="")
         {
    alert("should not be blank");
    return false;
        }
  }

it works well , but If i give the same coding for a runat = "server" it does not work How should I do this ? Is there a possibility for getting the control by getElementById for TextBox as there is no "name" attribute present in ...

[vee10]

Hi ,

for the server controls in the page load event u should add the attributes
example txtbox(if it is server control)
txtbox.Attributes.Add("onchange/onclick/whatever is the event","return empty()");

if I type the code as
<input type="text" name="txtbox" >
and make the script language as
function empty()
{
if(document.Form1.txtbox.value=="")
{
alert("should not be blank");
return false;
}
}
it works well , but If i give the same coding for a runat = "server" it does not work How should I do this ? Is there a possibility for getting the control by getElementById for TextBox as there is no "name" attribute present in ...

[malav123]

Hi,
For server controls you can use the script manager.... the form of how to use it is given below,
ScriptManager.RegisterClientScriptBlock(Page, Me.GetType(), "Alert", "alert('Message');", True)
I think this will help u....

[raghulvarma]

if I type the code as
[HTML]<input type="text" name="txtbox" >[/HTML]
and make the script language as

function empty()
    {
      if(document.Form1.txtbox.value=="")
         {
    alert("should not be blank");
    return false;
        }
  }

it works well , but If i give the same coding for a runat = "server" it does not work How should I do this ? Is there a possibility for getting the control by getElementById for TextBox as there is no "name" attribute present in ...

function tocheck()
{
var variable = document.getElementById("TextBox2").value;
if(isNaN(variable))
{
alert('not a numeric value');
}
}

//IN SIDE CODE BEHIND

Button1.Attributes.Add("onClick", " return tocheck()");

this works well but only after two ckicks why is it ?
thanks in advance