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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
/**
* Alias for document.getElementById.
* @param {string} id The ID of the element to find.
* @return {HTMLElement} The found element or null if not found.
*/
function $(id) {
return document.getElementById(id);
}
/**
* Creates a new URL which is the old URL with a GET param of key=value.
* Copied from ui/webui/resources/js/util.js.
* @param {string} url The base URL. There is not sanity checking on the URL so
* it must be passed in a proper format.
* @param {string} key The key of the param.
* @param {string} value The value of the param.
* @return {string} The new URL.
*/
function appendParam(url, key, value) {
var param = encodeURIComponent(key) + '=' + encodeURIComponent(value);
if (url.indexOf('?') == -1)
return url + '?' + param;
return url + '&' + param;
}
/**
* Creates a new URL by striping all query parameters.
* @param {string} url The original URL.
* @return {string} The new URL with all query parameters stripped.
*/
function stripParams(url) {
return url.substring(0, url.indexOf('?')) || url;
}
/**
* Extract domain name from an URL.
* @param {string} url An URL string.
* @return {string} The host name of the URL.
*/
function extractDomain(url) {
var a = document.createElement('a');
a.href = url;
return a.hostname;
}
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