Redirect to URL with query string parameter changed

urlhelper.js

var updateUrlParameter = function (uri, key, value) {
  // remove the hash part before operating on the uri
  var i = uri.indexOf('#');
  var hash = i === -1 ? ''  : uri.substr(i);
  uri = i === -1 ? uri : uri.substr(0, i);

  var re = new RegExp("([?&])" + key + "=.*?(&|$)", "i");
  var separator = uri.indexOf('?') !== -1 ? "&" : "?";

  if (!value) {
    // remove key-value pair if value is empty
    uri = uri.replace(new RegExp("([?&]?)" + key + "=[^&]*", "i"), '');
    if (uri.slice(-1) === '?') {
      uri = uri.slice(0, -1);
    }
    // replace first occurrence of & by ? if no ? is present
    if (uri.indexOf('?') === -1) uri = uri.replace(/&/, '?');
  } else if (uri.match(re)) {
    uri = uri.replace(re, '$1' + key + "=" + value + '$2');
  } else {
    uri = uri + separator + key + "=" + value;
  }
  return uri + hash;
}

window.location.replaceParam = function (param, newValue) {
  window.location.replace( updateUrlParameter(window.location.href, param, newValue) );
}