https://everything-lavender.com/scripts/gatag.js

1//	This javascript tags file downloads and external links in Google Analytics.
2//	You need to be using the Google Analytics New Tracking Code (ga.js) 
3//	for this script to work.
4//	To use, place this file on all pages just above the Google Analytics tracking code.
5//	All outbound links and links to non-html files should now be automatically tracked.
6//
7//	This script has been provided by Goodwebpractices.com
8//	Thanks to ShoreTel, MerryMan and Colm McBarron
9//
10//	www.goodwebpractices.com
11//	VKI has made changes as indicated below.								
12
13if (document.getElementsByTagName) {
14        // Initialize external link handlers
15        var hrefs = document.getElementsByTagName("a");
16        for (var l = 0; l < hrefs.length; l++) {
17				// try {} catch{} block added by erikvold VKI
18			try{
19	                //protocol, host, hostname, port, pathname, search, hash
20	                if (hrefs[l].protocol == "mailto:") {
21	                        startListening(hrefs[l],"click",trackMailto);
22	                } else if (hrefs[l].hostname == location.host) {
23	                        var path = hrefs[l].pathname + hrefs[l].search;
24							var isDoc = path.match(/\.(?:doc|eps|jpg|png|svg|xls|ppt|pdf|xls|zip|txt|vsd|vxd|js|css|rar|exe|wma|mov|avi|wmv|mp3)($|\&|\?)/);
25	                        if (isDoc) {
26	                                startListening(hrefs[l],"click",trackExternalLinks);
27	                        }
28	                } else if (!hrefs[l].href.match(/^javascript:/)) {
29	                        startListening(hrefs[l],"click",trackExternalLinks);
30	                }
31			}
32			catch(e){
33					continue;
34			}
35        }
36}
37
38function startListening (obj,evnt,func) {
39        if (obj.addEventListener) {
40                obj.addEventListener(evnt,func,false);
41        } else if (obj.attachEvent) {
42                obj.attachEvent("on" + evnt,func);
43        }
44}
45
46function trackMailto (evnt) {
47        var href = (evnt.srcElement) ? evnt.srcElement.href : this.href;
48        var mailto = "/mailto/" + href.substring(7);
49        if (typeof(pageTracker) == "object") pageTracker._trackPageview(mailto);
50}
51
52function trackExternalLinks (evnt) {
53        var e = (evnt.srcElement) ? evnt.srcElement : this;
54        while (e.tagName != "A") {
55                e = e.parentNode;
56        }
57        var lnk = (e.pathname.charAt(0) == "/") ? e.pathname : "/" + e.pathname;
58        if (e.search && e.pathname.indexOf(e.search) == -1) lnk += e.search;
59        if (e.hostname != location.host) lnk = "/external/" + e.hostname + lnk;
60        if (typeof(pageTracker) == "object") pageTracker._trackPageview(lnk); 
61}