Javascript enable/disable button based on text in textboxes

Pooja Chowdhury

10y2.4k.NET

    




but its throws an error
 
 the error is:

The Controls collection cannot be modified because the control contains code blocks

10 Replies

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no error... but when i put the value in the textbox. the button doesn't enabled.

can you please tried it in tabcontainer.

Amit Kumar Singh10y ago
Try this,

protected void Page_Load(object sender, EventArgs e)
{
Page.Header.DataBind();
}
Pooja Chowdhury10y ago
it throws an error the error is:

Actually it contains tabcontainer...

The Controls collection cannot be modified because the control contains code blocks
Amit Kumar Singh10y ago
its working ......run code which i have provided
Pooja Chowdhury10y ago
Hi Amit, i already tried this same code.it was not working
Amit Kumar Singh10y ago
hey,try this
Shubham Kumar10y ago
try this

or if you want on keyup event so do like this
on page load event (codebehind)
page_load{

this.txtId.Attributes.add("onkeyup","javascript:SetButtonStatus();");

}
Pooja Chowdhury10y ago
onblur event was not working.
Shubham Kumar10y ago
Hi,
It's of because there is no any OnKeyup event in asp textbox try to use OnBlur event