Sending parameters to a form

Yes, it is possible to pre-populate fields using the querystring or via PHP.

In order to do this you need to setup your field(s) to be populated dynamically. You do this by editing your form, then select the field you want to populate dynamically and edit that field.

Select the "Advanced" tab and then check the "Allow field to be populated dynamically" checkbox. This will then provide a UI for you to give the field a Parameter name. The parameter name is what is then used to populate the field dynamically.

For example, if you have an email field and you allow it to be populated dynamically and give it a parameter name of "email" if you then pass ?email=your@email.com when calling the page or post that contains the form... the email field will be pre-populated with the value of the email parameter.

This can be done with both visible and hidden fields. You can either populate them via the query string or using PHP.

Here's an example:

http://forum.gravityhelp.com/topic/pass-custom-field-from-a-post-into-a-form-that-post-links-to#post-14327