Question

I have a textbox control Super1 in my MasterPage.

I am using javascript to access this control from my content page like this:

<asp:Content ID='ContentPage' ContentPlaceHolderID='ContentPlaceHolder1' Runat='Server'> <script type='text/javascript'>     function Somethin() {         {             document.forms[0].elements['Super1'].value = 'sdfsd';             //document.getElementById('<%=Super1.ClientID%>').value = 'sdfsdf';                         }     } </script> </asp:Content> 

But while page load it says Super1 not found. How can I access Super1?

Answer 1

In your masterpage’s onload add this code :

string script = @'<script> function Somethin() {         document.getElementById('' + Super1.ClientID + @'').value = 'sdfsd';                }  Somethin(); </script>'; if (!Page.ClientScript.IsClientScriptBlockRegistered('somethin_script_block')) {     Page.ClientScript.RegisterClientScriptBlock(this.GetType(), 'somethin_script_block', script); } 

this will add your script to the end of the page.

EDIT : I just realized, you use your controls ID directly in your javascript code. this may cause the exception. I update your code to fix it.

I hope this helps.