JavaScript: Global access to query string variables as a map

window.location.query

// Source: http://stackoverflow.com/a/13455920/2502532
// -------------------------------------------------------------------
// Add prototype for 'window.location.query([source])' which contain an object
// of querystring keys and their values
// -------------------------------------------------------------------
if(!window.location.query) {
    window.location.query = function(source){
        var map = {};
        source = source || this.search;

        if ("" != source) {
            var groups = source.substr(1).split("&"), i;

            for (i in groups) {
                i = groups[i].split("=");
                map[decodeURIComponent(i[0])] = decodeURIComponent(i[1]);
            }
        }

        return map;
    };
}