Function addQueryParam

third_party/subscriptions-project/swg.js:5388–5403

* Adds a parameter to a query string. * @param {string} url * @param {string} param * @param {string} value * @return {string}

(url, param, value)

 * @return {string}
 */
function addQueryParam(url, param, value) {
  const queryIndex = url.indexOf('?');
  const fragmentIndex = url.indexOf('#');
  let fragment = '';
  if (fragmentIndex != -1) {
    fragment = url.substring(fragmentIndex);
    url = url.substring(0, fragmentIndex);
  }
  if (queryIndex == -1) {
    url += '?';
  } else if (queryIndex < url.length - 1) {
    url += '&';
  }
  url += encodeURIComponent(param) + '=' + encodeURIComponent(value);
  return url + fragment;
}

/**
 * @param {!../proto/api_messages.Message} message