javascript - Disabling a control based on checkbox state? -

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i want disable referenced control in html , javascript below, yet it's not doing it. seems simple enough. missing?

<html xmlns="http://www.w3.org/1999/xhtml"> <head><title>  </title> <script language="javascript" type="text/javascript">       function disable(isdisable, controlid) {         var objcontrol = document.getelementbyid(controlid);          if (objcontrol != null) {             objcontrol.disabled = isdisable;         }     } </script> </head> <body>     <form name="form1" id="form1">   <input name="date?4" type="text" value="1/1/2011 12:00:00 am" id="date?4" runat="server" style="border-color:black;font-family:arial;width:300px;"   /><input type="checkbox" style="font-family: arial" onclick="disable(this.checked, "date?4" );" >disable </form></body> </html>

your onclick badly formatted:

onclick="disable(this.checked, "date?4" );"

use instead:

onclick="disable(this.checked, 'date?4' );"

if use double quotes (") attribute value delimiters, can't use them inside value without escaping them. should use single quotes (') inside.


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