Track google analytics click event in in Gravity Forms

track-ga-click-event-gravityforms.php

<?php

// track conversions in Gravity Forms
function add_conversion_tracking_code($button, $form) {
	$dom = new DOMDocument();
	$dom->loadHTML($button);
	$input = $dom->getElementsByTagName('input')->item(0);
	if ($input->hasAttribute('onclick')) {
		$input->setAttribute("onclick","ga('send', 'click', 'submit');".$input->getAttribute("onclick"));
	} else {
		$input->setAttribute("onclick","ga('send', 'click', 'submit');");
	}
	return $dom->saveHtml();
}
add_filter( 'gform_submit_button_1', 'add_conversion_tracking_code', 10, 2);
?>