Posted by cYu on April 7, 2009 at 8:36pm
http://drupal.org/project/validation_api and http://drupal.org/project/validations
Validation API was created as part of last year's SoC program and has seen steady progress since. Validations was created last month and seems to duplicate much of the functionality, strive for the same feature improvements as Validations API (mainly JS validations), while lacking in some key functionality that is contained in Validations API (CCK field validation).
Issues have been added to both queues about potential overlap and collaboration but with no responses.
Comments
Ajax module as well for client side validation
There is this module as well for client side validation:
http://drupal.org/project/ajax
Would be nice if they merge to provide a client and server side validation API just like the PEAR QuickForm which is a fantastic form builder ;P
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Validation run down.
http://groups.drupal.org/node/209978