Send a tracking event to facebook once all sparrow data is available

facebook pixel for sparrow.js

/**
 * IFFE to kick it all off.
 */
(function iffe() {
  // setup the fbq facebook queue
  !function(f,b,e,v,n,t,s){if(f.fbq)return;n=f.fbq=function(){n.callMethod?
  n.callMethod.apply(n,arguments):n.queue.push(arguments)};if(!f._fbq)f._fbq=n;
  n.push=n;n.loaded=!0;n.version='2.0';n.queue=[];t=b.createElement(e);t.async=!0;
  t.src=v;s=b.getElementsByTagName(e)[0];s.parentNode.insertBefore(t,s)}(window,
  document,'script','https://connect.facebook.net/en_US/fbevents.js');

  var killSwitch = Date.now() + 15000; // 15 seconds

  /**
   * Inject a facebook pixel in the page.
   *
   * @returns {undefined} nothing.
   */
  function injectPixel() {
    var imgtag = document.createElement('img');
    imgtag.height = '1';
    imgtag.width = '1';
    imgtag.style = 'display:none;';
    imgtag.src = 'https://www.facebook.com/tr?id=228464857488266&ev=PageView';
    document.body.appendChild(imgtag);
  }

  /**
   * Send a message to the console about missing data
   *
   * @param {string} message - The message
   * @returns {undefined} nothing.
   */
  function warning(message) {
    console.warn('Facebook Pixel had a problem.', message);
  }

  /**
   * Updates the user or context 4d objects and send tracking to Facebook.
   *
   *
   * @param {Object} fourd - The _4d object
   * @returns {*} either a warning or nothing.
   */
  function fbtrack(fourd) {
    var user = fourd && fourd.user;
    var atr = user && user.atr;
    var attribute = JSON.stringify(atr);
    var cache = window.SparrowCache;
    var track = cache && cache.pixels && cache.pixels[0] && cache.pixels[0].track;
    var xid = user && user.xid;

    // exit early if _4d.user.xid or context are missing
    if (!fourd.context || !fourd.user.xid) {
      warning('Missing the _4d.context object or _4d.user.xid.');
      return;
    }

    // fire a fbq xid event
    window.fbq('trackCustom', 'xidTrack', { xid: xid });

    // exit early if _4d.user.atr is missing
    if (!atr) {
      warning('Missing the _4d.user.atr.');
      return;
    }

    // update _4d.user.atr.xid
    atr.xid = xid;

    // fire a fbq spire event
    window.fbq('trackCustom', 'spire_nyr_rpt_high_prop', atr);

    if (!track) {
      warning('Missing the SparrowCache.pixels[0].track function.');
      return;
    }

    // fire a sparrow track event
    track('citizenNet-4d-fbTest', 'fb-pixel-attrCalled', { attr: attribute });
  }

  /**
   * Recursively check for the _4d.user object
   *
   * @returns {*} call fbtrack or recursively call ourselves
   */
  function check4d() {
    var fourd = window.top._4d;
    if (fourd && fourd.user) {
      return fbtrack(fourd);
    }

    // stop at 15 seconds
    if (Date.now() >= killSwitch) {
      warning('15 second timeout reached _4d.user not found.');
      return false;
    }

    window.setTimeout(function check4dTimer() {
      return check4d();
    }, 1000);
  }

  injectPixel();
  window.fbq('init', '228464857488266');
  window.fbq('track', 'PageView');
  check4d();
}());