ckanext-googleanalytics/ckanext/googleanalytics/assets/googleanalytics_event_tracking.js

// Add Google Analytics Event Tracking to resource download links.
ckan.module("google-analytics", function(jQuery, _) {
    "use strict";

    return {
        options: {
            googleanalytics_resource_prefix: ""
        },
        initialize: function() {
            jQuery("a.resource-url-analytics").on("click", function() {

                var resource_url = encodeURIComponent(jQuery(this).prop("href"));
                if (resource_url) {
                    ga("send", "event", "Resource", "Download", resource_url);
                }
            });
        }
    };
});