form_tracking.js

$ = jQuery;

/*
 * jQuery BBQ: Back Button & Query Library - v1.3pre - 8/26/2010
 * http://benalman.com/projects/jquery-bbq-plugin/
 * 
 * Copyright (c) 2010 "Cowboy" Ben Alman
 * Dual licensed under the MIT and GPL licenses.
 * http://benalman.com/about/license/
 */
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/*! jquery.cookie v1.4.1 | MIT */
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(function() {
  var FormTracking;

  FormTracking = (function() {
    function FormTracking() {}

    window.form_selector = '[data-drip-embedded-form]'; // css selector for your optin forms

    FormTracking.prototype.setup = function() {
      this._setup_new_session();
      this._extract_and_store_utm();
      this._modify_any_drip_forms();
    };
    
    FormTracking.prototype._setup_new_session = function() {
      if (!jQuery.cookie('orig_ref')) {
        var url = window.location.origin + window.location.pathname;
        jQuery.cookie('orig_ref', url, {
          path: '/',
          expires: 365
        });
      }
    }

    FormTracking.prototype._extract_and_store_utm = function() {
      var utm_hash = '';
      p = $.deparam.querystring();

      if (!$.isEmptyObject(p)) {
        
        res = {};
        $.each(p, function(key, value) {
          if (key.indexOf('utm') === 0) {
            res[key] = value;
          }
        })

        jQuery.cookie('orig_utm', $.param(res), {
          path: '/',
          expires: 365
        })
      }
    }

    FormTracking.prototype._modify_any_drip_forms = function() {
      $(form_selector).each(function(){
        var original_referrer = $.cookie('orig_ref');
        var utms = $.cookie('orig_utm');

        $(this).append($('<input type="hidden">').attr('name', 'fields[original_referrer]').val(original_referrer));
        $(this).append($('<input type="hidden">').attr('name', 'fields[optin_url]').val(window.location.origin + window.location.pathname));

        if (utms) {
          var t = this;
          utms = $.deparam(utms)
          $.each(utms, function(key, value){
            $(t).append($('<input type="hidden">').attr('name', 'fields['+key+']').val(value))
          })
        }

      })
    }

    return FormTracking;

  })();

  window._form_tracking = new FormTracking;

  jQuery(function(){
    window._form_tracking.setup();
  });

}).call(this);