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Conditional Logic Object

Conditional Logic, when applied to the form or page button or to any field, controls the visibility of that element based on a choice selected or value entered by the user in other fields on the form. It can also be used to determine if a notification, confirmation or add-on feed should be used.

CAPTCHA

The CAPTCHA field allows you to add a captcha field to your form powered by the free reCAPTCHA service. This helps determine if the form is being submitted by a human or a scripted bot.

Button Object

The Button Object is an an associative array. Part of the Form Object it controls the way a form button is displayed.

Bulk Add / Predefined Choices

When using a field with Choices (Drop Down, Multi Select, Checkboxes, or Radio Buttons) clicking the Bulk Add / Predefined Choices in General Settings allows you to select a category and customize the predefined choices or paste your own list to bulk add choices.

Advanced Configuration Options

https://docs.gravityforms.com/wp-config-options/.

Submission Data Object

The Submission Data object is an associative array containing all the payment related properties for the entry being processed by an add-on.

Address

The Address field makes it quick and easy to capture address information on a form.

Notification (deprecated)

The Notification object contains the settings for the administrator’s notification, such as destination email address, email subject and body.

string

http://codex.wordpress.org/How_to_Pass_Tag_Parameters#String.

Lead Object (deprecated)

See the Entry object for details.