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From Sylvain Wallez <sylv...@apache.org>
Subject CForms: validation error bubbling
Date Thu, 23 Sep 2004 13:38:28 GMT
Hi all,

Looking at the paginated repeater patch [1], I again encountered the 
problem of non-displayed widgets that can have validation errors and 
therefore forbid form validation, leading to confusing situations for 
the user.

A general solution for this problem could be to "bubble up" validation 
errors: when the validation error or a widget changes (including when 
it's set to null), the widget notifies its parent of this fact. That can 
allow us to easily implement validation-error gatherers in container 
widgets to display that there's a problem "somewhere" in the container.

For example, in the case of paginated repeater, page numbers or 
scrolling buttons may give visual feedback if errors exist outside of 
the displayed page.

For wizards, we could have group or struct widgets representing each 
page which, by gathering errors raised by their children, would allow to 
display a global validation status of the wizard or drive the user back 
to offending pages.

Thoughts?

Sylvain

[1] http://issues.apache.org/bugzilla/show_bug.cgi?id=30213

-- 
Sylvain Wallez                                  Anyware Technologies
http://www.apache.org/~sylvain           http://www.anyware-tech.com
{ XML, Java, Cocoon, OpenSource }*{ Training, Consulting, Projects }


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