chrome/browser/resources/gaia_auth/util.js

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 /**
   6  * Alias for document.getElementById.
   7  * @param {string} id The ID of the element to find.
   8  * @return {HTMLElement} The found element or null if not found.
   9  */
  10 function $(id) {
  11   return document.getElementById(id);
  12 }
  13
  14 /**
  15  * Creates a new URL which is the old URL with a GET param of key=value.
  16  * Copied from ui/webui/resources/js/util.js.
  17  * @param {string} url The base URL. There is not sanity checking on the URL so
  18  *     it must be passed in a proper format.
  19  * @param {string} key The key of the param.
  20  * @param {string} value The value of the param.
  21  * @return {string} The new URL.
  22  */
  23 function appendParam(url, key, value) {
  24   var param = encodeURIComponent(key) + '=' + encodeURIComponent(value);
  25
  26   if (url.indexOf('?') == -1)
  27     return url + '?' + param;
  28   return url + '&' + param;
  29 }
  30
  31 /**
  32  * Creates a new URL by striping all query parameters.
  33  * @param {string} url The original URL.
  34  * @return {string} The new URL with all query parameters stripped.
  35  */
  36 function stripParams(url) {
  37   return url.substring(0, url.indexOf('?')) || url;
  38 }
  39
  40 /**
  41  * Extract domain name from an URL.
  42  * @param {string} url An URL string.
  43  * @return {string} The host name of the URL.
  44  */
  45 function extractDomain(url) {
  46   var a = document.createElement('a');
  47   a.href = url;
  48   return a.hostname;
  49 }