Stephen A. Fuqua (saf)

a Bahá'í, software engineer, and nature lover in Austin, Texas, USA

AJAX RESPONSE Parsing Exception

Problem: In newly AJAX-enabled .Net 2.0 page, buttons that redirect user to another page are suddenly throwing the following error:

Sys.WebForms.PageRequestManagerParserErrorException: The message received from
the server could not be parsed. Common causes for this error are when the
response is modified by calls to Response.Write(), response filters, HttpModules,
or server trace is enabled. Details: Error parsing near

Specifically, I had a small landing page with a few checkbox and a few buttons. I had wrapped these in an AJAX UpdatePanel. Below the panel is a Save button and a Reset button. These trigger updates to the UpdatePanel.

Solution: Eilon Lipton’s Blog fully describes what is going on. My buttons inside the UpdatePanel were redirecting to another page. The fix was simple — add the buttons as regular PostBackTriggers so that the UpdatePanel would complete the postback properly.


imported from old Movable Type blog

author: Drew
date: ‘2007-10-12 08:55:02 -0500’

Thanks for sharing your knowledge! Saved me hours of banging my head on the keyboard :)

Posted with : Tech, Microsoft .NET Framework