Get URL query or hash parameter

file.js

(function () {
  //source: https://stackoverflow.com/questions/901115/how-can-i-get-query-string-values-in-javascript
  // modified to also check hash
  function getParameterByName(name, url) {
    if (!url) url = window.location.href;
    name = name.replace(/[\[\]]/g, "\\$&");
    var regex = new RegExp("[?#&]" + name + "(=([^&#]*)|&|#|$)"),
        results = regex.exec(url);
    if (!results) return null;
    if (!results[2]) return '';
    return decodeURIComponent(results[2].replace(/\+/g, " "));
  }
  
})();