Using this Google Analytics Extender Javascript you can easily track file downloads and outgoing links with Google Analytics.
/*
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
// cross-browser implementation of add event listener
function addListener(element, type, expression)
{
if (window.addEventListener)
{
// W3C standard
element.addEventListener(type, expression, false);
return true;
}
else if (window.attachEvent)
{
// MS IE way
element.attachEvent("on" + type, expression);
return true;
}
else
{
return false;
}
}
// cross-compatible GA tracker
function trackEvent(descriptor)
{
try
{
// newer GA versions
if (typeof pageTracker != "undefined")
{
pageTracker._trackPageview(descriptor);
}
// old urchin versions
else if (typeof urchinTracker != "undefined")
{
urchinTracker(descriptor);
}
}
catch (exception)
{
// alert('Exception: ' + exception);
}
}
// parses any event fired
function parseEvent(evt)
{
// cross-browser code to get the element related to the event
var e = window.event ? evt.srcElement : evt.target;
// the element is a traditional a-href link
if (e.nodeName == "A")
{
// external links - href should not point at the same hostname
if (typeof e.href != "undefined" && e.href.indexOf(location.host) == -1)
{
// replace all non-alphanumeric characters and combine to a string
var url = e.href.replace(/[^0-9|a-z|A-Z]/g, "_");
var str = "/outgoing/-" + url;
trackEvent(str);
}
// file downloads - href contains a known download file extension
if (typeof e.href != "undefined" && e.href.match(/\.(doc|pdf|xls|ppt|zip|txt|vsd|vxd|js|css|rar|exe|wma|mov|avi|wmv|mp3)$/))
{
// replace all non-alphanumeric characters and combine to a string
var url = e.href.replace(/[^0-9|a-z|A-Z]/g, "_");
var str = "/download/-" + url;
trackEvent(str);
}
}
// track if it is an button event
else if (e.type == "button" )
{
// replace all non-alphanumeric characters and combine to a string
var name = e.name.replace(/[^0-9|a-z|A-Z]/g, "_");
var value = e.value.replace(/[^0-9|a-z|A-Z]/g, "_");
var str = "/event/-" + name + "-" + value;
trackEvent(str);
}
}
// add a single click listener to the document
addListener(document, "click", parseEvent);
Download the code here.
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