$(function (){
$('input,textarea,select').focus(function(){
dataLayer.push({'event':'gaEvent', 'eventCategory': 'conversion_form_' + $(this).attr('name'), 'eventAction': 'focus'});
});
});
的な
https://developers.google.com/tag-manager/devguide#events
http://stackoverflow.com/questions/18192982/tracking-events-using-google-tag-manager