fetch_url_params.js

/*
 * Based on https://css-tricks.com/snippets/javascript/get-url-variables/
 * @param  {String} url The URL
 * @return {Object} The URL parameters if there are any, if not return undefined
*/
var getParams = function(url) {
  var params = {};
  var parser = document.createElement("a");
  parser.href = url;
  var query = parser.search.substring(1);

  if (!!query) {
    var vars = query.split("&");
    for (var i = 0; i < vars.length; i++) {
      var pair = vars[i].split("=");
      params[pair[0]] = decodeURIComponent(pair[1]);
    }
    return params
  }
};