Prevent double click on submit button in Gravity Forms

prevent-click-click-in-gf.php

<?php

add_action( 'gform_enqueue_scripts', 'your_prefix_add_scripts' );
function your_prefix_add_scripts($form) {
	echo '<script>
		document.addEventListener( "DOMContentLoaded", function( e ) {
			if ( typeof jQuery !== "undefined" ) {
				jQuery(document).on( "click", "#gform_' . $form['id'] . ' [type=submit]", function(e) {
					if( jQuery(this).data("isclicked" ) === true ) {
						e.preventDefault();
						return false;
					}

					jQuery(this).css("opacity", 0.2).data("isclicked", true);
				});
			}
		});
	</script>';
}