How to Customize Gravity Forms Error Messages with JavaScript Popups

As seasoned WordPress developers with extensive experience in Gravity Forms customization, we know it's one of the most user-friendly contact form plugins available. Its flexibility allows beginners and experts alike to tailor functionality to their needs. Building on our previous guide to adding placeholder text, here's how to replace standard error messages with eye-catching JavaScript popups.

Add the following code to your theme's functions.php file:

add_filter( 'gform_validation_message', 'sw_gf_validation_message', 10, 2 );
function sw_gf_validation_message( $validation_message, $form ) {
    add_action( 'wp_footer', 'sw_gf_js_error' );
    return '';
}

function sw_gf_js_error() { ?>
    <script>
        alert("¡Vaya, debes haber olvidado algo ... los campos marcados con un * son obligatorios!");
    </script>
<?php }

Customize the message inside the alert() function as needed. Now, when users miss required fields, a JavaScript popup appears instead of the default top-of-form notice, improving user experience on your site.

Credits: Brad Williams