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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 */
10function $(id) {
11  return document.getElementById(id);
12}
13
14/**
15 * Extract query params from given search string of an URL.
16 * @param {string} search The search portion of an URL to extract params.
17 * @return {Object} The key value pairs of the extracted params.
18 */
19function getUrlSearchParams(search) {
20  var params = {};
21
22  if (search) {
23    // Strips leading '?'
24    search = search.substring(1);
25    var pairs = search.split('&');
26    for (var i = 0; i < pairs.length; ++i) {
27      var pair = pairs[i].split('=');
28      if (pair.length == 2) {
29        params[pair[0]] = decodeURIComponent(pair[1]);
30      } else {
31        params[pair] = true;
32      }
33    }
34  }
35
36  return params;
37}
38
39/**
40 * Creates a new URL which is the old URL with a GET param of key=value.
41 * Copied from ui/webui/resources/js/util.js.
42 * @param {string} url The base URL. There is not sanity checking on the URL so
43 *     it must be passed in a proper format.
44 * @param {string} key The key of the param.
45 * @param {string} value The value of the param.
46 * @return {string} The new URL.
47 */
48function appendParam(url, key, value) {
49  var param = encodeURIComponent(key) + '=' + encodeURIComponent(value);
50
51  if (url.indexOf('?') == -1)
52    return url + '?' + param;
53  return url + '&' + param;
54}
55
56/**
57 * Creates a new URL by striping all query parameters.
58 * @param {string} url The original URL.
59 * @return {string} The new URL with all query parameters stripped.
60 */
61function stripParams(url) {
62  return url.substring(0, url.indexOf('?')) || url;
63}
64
65/**
66 * Extract domain name from an URL.
67 * @param {string} url An URL string.
68 * @return {string} The host name of the URL.
69 */
70function extractDomain(url) {
71  var a = document.createElement('a');
72  a.href = url;
73  return a.hostname;
74}
75