https://legacy.forums.gravityhelp.com/topic/validate-field-based-on-entry-of-another-field Gravity Support Forums Topic: Validate field based on entry of another field en-US Sat, 04 Apr 2026 11:10:14 +0000 http://bbpress.org/?v=1.0.1 q https://legacy.forums.gravityhelp.com/search.php https://legacy.forums.gravityhelp.com/topic/validate-field-based-on-entry-of-another-field#post-85668 Wed, 31 Oct 2012 10:00:35 +0000 Chris Hajer 85668@https://legacy.forums.gravityhelp.com/ <p>Glad you got that working. Thanks for the reply. </p> https://legacy.forums.gravityhelp.com/topic/validate-field-based-on-entry-of-another-field#post-85175 Tue, 30 Oct 2012 09:36:55 +0000 paddelboot 85175@https://legacy.forums.gravityhelp.com/ <p>I was too focused on the entry object. I forgot I can just use the $_POST data to compare any fields.</p> <p>Regards </p> https://legacy.forums.gravityhelp.com/topic/validate-field-based-on-entry-of-another-field#post-84678 Mon, 29 Oct 2012 09:06:44 +0000 Chris Hajer 84678@https://legacy.forums.gravityhelp.com/ <p>You can. Use the gform_validation hook to do the validation for you, then do your comparison in php (in your theme's functions.php) and if there is an error, return the error with your error message.</p> <p><a href="http://www.gravityhelp.com/documentation/page/Gform_validation" rel="nofollow">http://www.gravityhelp.com/documentation/page/Gform_validation</a> </p> https://legacy.forums.gravityhelp.com/topic/validate-field-based-on-entry-of-another-field#post-84663 Mon, 29 Oct 2012 08:38:17 +0000 paddelboot 84663@https://legacy.forums.gravityhelp.com/ <p>Hi,</p> <p>How is it possible to write a custom validation rule for a form field based on the value entered in another field within the same form? </p> <p>Example: Startdate and enddate, enddate shouldn't be before startdate.</p> <p>Regards, don't get flooded,</p> <p>Michael </p>