updateUrlParameter.js

function updateUrlParameter(uri, key, value) {

  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;
}