window.opener.document.TextBoxRateLockDate is null or not an object

My ASP.Net page has a calendar picker link with an onclick event as shown below:

<a href="http://links.10026.com/?link=javascript:;" onclick="calendarPicker('TextBoxRateLockDate');" title="Pick Date from Calendar"><img src="http://pics.10026.com/?src=../../../../App_Images/simplecalendar/calendar.gif" border="0" /></a>

The above link is inside of a MultiView control, which is inside an UpdatePanel control. The link pops-up the date picker calendar just fine but when I select a date , I get the following error:

Microsoft Jscript runtime error:
'window.opener.document.TextBoxRateLockDate' is null or not an object

How can I resolve this issue?

Hi,

This is a pure javascript issue.

I'd suggest using document.getElementById() method to find the textbox. Usually like this: window.opener.document.getElementById("TextBoxRateLockDate")

Hope this helps.