Adds Google Analytics Tracking for Gravity Forms.

gforms-google-analytics.php

<?php

add_filter( "gform_submit_button", "slimline_gform_google_analytics", 10, 2 ); // add Google Analytics tracking to form submits

/**
 * slimline_gform_google_analytics function
 * 
 * Adds Google Analytics Tracking for Gravity Forms.
 * 
 * @global object $wp The WordPress global object. Used for capturing the current request URI {@see http://kovshenin.com/2012/current-url-in-wordpress/}
 * @param string $button_input Submit button HTML
 * @param object $form The current form
 * @return string Submit button HTML with Google Analytics event tracking added 
 * @see http://www.danielauener.com/setting-up-gravity-forms-analytics-goals/
 * @since 0.6.0
 */
function slimline_gform_google_analytics( $button_input, $form ) {
	global $wp;

	$dom = new DOMDocument();
	$dom->loadHTML( $button_input );
	$input = $dom->getElementsByTagName( 'input' )->item(0);

	$action = sanitize_title( $form[ 'title' ] );
	parse_str( $_SERVER[ 'QUERY_STRING' ], $query_args );
	$url = home_url( add_query_arg( $query_args, $wp->request ) );


	if ( $input->hasAttribute( 'onclick' ) ) {
		$input->setAttribute( "onclick", "_gaq.push(['_trackEvent', 'web-form', '{$action}', '{$url}',, false]); {$input->getAttribute( 'onclick' )}" );
	} else {
		$input->setAttribute( "onclick", "_gaq.push(['_trackEvent', 'web-form', '{$action}', '{$url}',, false]);" );
	}

	return $dom->saveHtml( $input );
}

Does this account for when people try to submit a form that has errors in it?