Event Tracking - Web Tracking (analytics.js), In this example, the addEventListener function is a utility to add event listeners across browsers. This function is used to add an event listener to the PDF download link to listen for the click event. When a click event occurs, the event is sent to Google Analytics. Source (https://developers.googl…

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var downloadLink = document.getElementById('button');
addListener(downloadLink, 'click', function() {
  ga('send', 'event', 'button', 'click', 'nav-buttons');
});


/**
 * Utility to wrap the different behaviors between W3C-compliant browsers
 * and IE when adding event handlers.
 *
 * @param {Object} element Object on which to attach the event listener.
 * @param {string} type A string representing the event type to listen for
 *     (e.g. load, click, etc.).
 * @param {function()} callback The function that receives the notification.
 */
function addListener(element, type, callback) {
 if (element.addEventListener) element.addEventListener(type, callback);
 else if (element.attachEvent) element.attachEvent('on' + type, callback);
}

// Using jQuery Event API v1.3
$('#button').on('click', function() {
  ga('send', 'event', 'button', 'click', 'nav-buttons');
});