Trigger validation of whole form

Hi, I am using the “Gravity forms for WooCommerce Plugin”. Unfortunately upon using it, the validations don’t work anymore. With this plugin entries get validated when a field has been exited from focus. Yet, when I just jump down to the “Add to Cart” button, which is the replacement for “Submit”, it doesn’t trigger any validations. Is there a way to validate the whole form? E.g. when pressing the “Add to Cart” button as in the example above? Thank you in advance! Matti