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Validate field based on entry of another field

Gravity Support Forums » Plugin Support » Gravity Forms

  1. paddelboot
    Member

    Hi,

    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?

    Example: Startdate and enddate, enddate shouldn't be before startdate.

    Regards, don't get flooded,

    Michael

    Posted 12 years ago on Monday October 29, 2012 | Permalink

  2. Chris Hajer
    Key Master

    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.

    http://www.gravityhelp.com/documentation/page/Gform_validation

    Posted 12 years ago on Monday October 29, 2012 | Permalink

  3. paddelboot
    Member

    I was too focused on the entry object. I forgot I can just use the $_POST data to compare any fields.

    Regards

    Posted 12 years ago on Tuesday October 30, 2012 | Permalink

  4. Chris Hajer
    Key Master

    Glad you got that working. Thanks for the reply.

    Posted 12 years ago on Wednesday October 31, 2012 | Permalink

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