Hi Jason,
As for the ASP.NET AJAX update panel TextBox autopostback issue, I've
performed some test on my local environment. It seems this is a environment
specific problem. When you use AJAX updatepanel to do partial update in
page, the postback in panel is actually marshed through xml request sent by
the ajax background components(use xmlhttp...), therefore, if the postback
data is large, whether the postback event code logic is long-run or the
network condition is not quite good, it may takes sometime for the partial
postback to finish and you'll encounter a delay. In my local test, when the
panel partial postback, it refresh the panel immediately so that I haven't
a chance to input any other data in other textboxes. BTW, have you checked
the client-side rendered html source to see whether the postback script is
set to execute immdediately as below:
=========
<input name="txt3" type="text"
onchange="javascript
:setTimeout('__doPostBack(\'tx t3\',\'\')', 0)"
............. id="txt3" />
=============
If the rendered source doesn't get wrong, the problem is due to the ajax
postback which rely on the network condition and the server processing
time. If possible you can use clientScript to display a message in a label
indicate that the data is submit for processing. Or you can even make the
other textbox readonly when one of them is postback, e.g.
========
txt1.Attributes["onchange"] = "document.getElementById('txt2').readOnly =
true;";
===========
Sincerely,
Steven Cheng
Microsoft MSDN Online Support Lead
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