Google Analytics Download tracking

var trackableExtensions = "zip,exe,pdf,doc,docx,rtf,xls,xlsx,ppt,pptx,mp3,jpeg,jpg";

var baseUrl = "target site url";

var relativeBasePath = "/";

$(document).ready(function () {

    $("a").on("click", function () {

        if (isTrackableExtension($(this).attr('href'))) {

            var filePath = $(this).attr('href');

            if (filePath.toLowerCase().indexOf(baseUrl) > -1)

                filePath = filePath.toLowerCase().replace(baseUrl, "");

            else

                filePath = filePath.toLowerCase().replace(relativeBasePath, "");

            sendEventToAnalytics(filePath);

        }

    });

});

function getExtensions() {

    return trackableExtensions.split(",");

}

function isTrackableExtension(linkUrl) {

    var trackable = false;

    var extenstions = getExtensions();

    for (var i = 0; i < extenstions.length; i++) {

        if (linkUrl.indexOf(extenstions[i]) > -1) {

            trackable = true;

            break;

        }

    }

    return trackable;

}

function getFileExtension(filename) {

    var extension = "";

    var extenstions = getExtensions();

    for (var i = 0; i < extenstions.length; i++) {

        if (filename.indexOf(extenstions[i]) > -1) {

            extension = extenstions[i].replace(".", "");

            break;

        }

    }

    return extension;

}

function getFileName(linkUrl) {

    var fileName = linkUrl.substring(linkUrl.lastIndexOf("/") + 1);

    return fileName;

}

function sendEventToAnalytics(filename) {

    var eventAction = 'Download-' + getFileExtension(filename).toUpperCase();

    _gaq.push(['_trackEvent', 'Document', eventAction, filename]);

}