How do I extract Google Analytics campaign data from their cookie with Javascript?

六月ゝ 毕业季﹏ 提交于 2019-11-30 00:35:38

I ended up figuring this out on my own. I just dug into what the cookie had stored and extracted the information. Here's what I came up with:

var ga_source = '';
var ga_campaign = '';
var ga_medium = '';
var ga_term = '';
var ga_content = '';
var gc = '';
var c_name = "__utmz";
if (document.cookie.length>0){
    c_start=document.cookie.indexOf(c_name + "=");
    if (c_start!=-1){
        c_start=c_start + c_name.length+1;
        c_end=document.cookie.indexOf(";",c_start);
        if (c_end==-1) c_end=document.cookie.length;
        gc = unescape(document.cookie.substring(c_start,c_end));
    }
}
if(gc != ""){
    var z = gc.split('.'); 
    if(z.length >= 4){
    var y = z[4].split('|');
        for(i=0; i<y.length; i++){
            if(y[i].indexOf('utmcsr=') >= 0) ga_source = y[i].substring(y[i].indexOf('=')+1);
            if(y[i].indexOf('utmccn=') >= 0) ga_campaign = y[i].substring(y[i].indexOf('=')+1);
            if(y[i].indexOf('utmcmd=') >= 0) ga_medium = y[i].substring(y[i].indexOf('=')+1);
            if(y[i].indexOf('utmctr=') >= 0) ga_term = y[i].substring(y[i].indexOf('=')+1);
            if(y[i].indexOf('utmcct=') >= 0) ga_content = y[i].substring(y[i].indexOf('=')+1);
        }
    }
}

I'm sure it could be more streamlined but I was just happy to get this far with it. Once you have these variables you can do whatever you need with them.

I've rewritten this to parse the values onto an associative array and make use of quicksmode cookie functions:

function parseAnalyticsCookie() {
    // inspiration from http://stackoverflow.com/questions/1688657/how-do-i-extract-google-analytics-campaign-data-from-their-cookie-with-javascript
    // readCookie is from // http://www.quirksmode.org/js/cookies.html
    // utmcsr = utm_source
    // utmccn = utm_campaign
    // utmcmd = utm_medium
    // utmctr = utm_term
    // utmcct = utm_content
    var values = {};
    var cookie = readCookie("__utmz");
    if (cookie) {
        var z = cookie.split('.'); 
        if (z.length >= 4) {
            var y = z[4].split('|');
            for (i=0; i<y.length; i++) {
                var pair = y[i].split("=");
                values[pair[0]] = pair[1];
            }
        }
    }
    return values;
}

Now works:

   function extractAnalyticsData(){
      var data = {};
      var ga_source = '';
      var ga_campaign = '';
      var ga_medium = '';
      var ga_term = '';
      var ga_content = '';
      var gc = '';
      var c_name = "__utmz";
      if (document.cookie.length>0){
          c_start=document.cookie.indexOf(c_name + "=");
          if (c_start!=-1){
            c_start=c_start + c_name.length+1;
            c_end=document.cookie.indexOf(";",c_start);
            if (c_end==-1) c_end=document.cookie.length;
            gc = unescape(document.cookie.substring(c_start,c_end));
          }
      }
      data.gc = gc;
      if(gc != ""){
          var y = gc.split('|'); 
        for(i=0; i<y.length; i++){
          if(y[i].indexOf('utmcsr=') >= 0) data.ga_source = y[i].substring(y[i].indexOf('=')+1);
          if(y[i].indexOf('utmccn=') >= 0) data.ga_campaign = y[i].substring(y[i].indexOf('=')+1);
          if(y[i].indexOf('utmcmd=') >= 0) data.ga_medium = y[i].substring(y[i].indexOf('=')+1);
              if(y[i].indexOf('utmcct=') >= 0) data.ga_content = y[i].substring(y[i].indexOf('=')+1);
          if(y[i].indexOf('utmctr=') >= 0) data.ga_term = y[i].substring(y[i].indexOf('=')+1);
        }
      }
      return data;
    };
    extractAnalyticsData();
Marcin

With response to @Eduardo comment (about the chose answer not working for AdWords), if you'd like to make it work for AdWords traffic this answer might be worth a shot:

How to capture if a visitor is from a google adwords click

Haven't tried it though.

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