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| 1 /* | |
| 2 Copyright (c) 2012 The Chromium Authors. All rights reserved. | |
| 3 Use of this source code is governed by a BSD-style license that can be | |
| 4 found in the LICENSE file. | |
| 5 */ | |
| 6 | |
| 7 /** | |
| 8 * @fileoverview Common methods for performance-plotting Javascript. | |
| 9 */ | |
| 10 | |
| 11 /** | |
| 12 * Fetches a URL asynchronously and invokes a callback when complete. | |
| 13 * | |
| 14 * @param {string} url URL to fetch. | |
| 15 * @param {Function(string, string)} callback The function to invoke when the | |
| 16 * results of the URL fetch are complete. The function should accept two | |
| 17 * strings representing the URL data, and any errors, respectively. | |
| 18 */ | |
| 19 function Fetch(url, callback) { | |
| 20 var r = new XMLHttpRequest(); | |
| 21 r.open('GET', url, true); | |
| 22 r.setRequestHeader('pragma', 'no-cache'); | |
| 23 r.setRequestHeader('cache-control', 'no-cache'); | |
| 24 | |
| 25 r.onreadystatechange = function() { | |
| 26 if (r.readyState == 4) { | |
| 27 var text = r.responseText; | |
| 28 var error; | |
| 29 if (r.status != 200) | |
| 30 error = url + ': ' + r.status + ': ' + r.statusText; | |
| 31 else if (!text) | |
| 32 error = url + ': null response'; | |
| 33 callback(text, error); | |
| 34 } | |
| 35 } | |
| 36 | |
| 37 r.send(null); | |
| 38 } | |
| 39 | |
| 40 /** | |
| 41 * Parses the parameters of the current page's URL. | |
| 42 * | |
| 43 * @return {Object} An object with properties given by the parameters specified | |
| 44 * in the URL's query string. | |
| 45 */ | |
| 46 function ParseParams() { | |
| 47 var result = new Object(); | |
| 48 | |
| 49 var query = window.location.search.substring(1) | |
| 50 if (query.charAt(query.length - 1) == '/') | |
| 51 query = query.substring(0, query.length - 1) // Strip trailing slash. | |
| 52 var s = query.split('&'); | |
| 53 | |
| 54 for (i = 0; i < s.length; ++i) { | |
| 55 var v = s[i].split('='); | |
| 56 var key = v[0]; | |
| 57 var value = unescape(v[1]); | |
| 58 result[key] = value; | |
| 59 } | |
| 60 | |
| 61 if ('history' in result) { | |
| 62 result['history'] = parseInt(result['history']); | |
| 63 result['history'] = Math.max(result['history'], 2); | |
| 64 } | |
| 65 if ('rev' in result) { | |
| 66 result['rev'] = parseInt(result['rev']); | |
| 67 result['rev'] = Math.max(result['rev'], -1); | |
| 68 } | |
| 69 | |
| 70 return result; | |
| 71 } | |
| 72 | |
| 73 /** | |
| 74 * Creates the URL constructed from the current pathname and the given params. | |
| 75 * | |
| 76 * @param {Object} An object containing parameters for a URL query string. | |
| 77 * @return {string} The URL constructed from the given params. | |
| 78 */ | |
| 79 function MakeURL(params) { | |
| 80 var url = window.location.pathname; | |
| 81 var sep = '?'; | |
| 82 for (p in params) { | |
| 83 if (!p) | |
| 84 continue; | |
| 85 url += sep + p + '=' + params[p]; | |
| 86 sep = '&'; | |
| 87 } | |
| 88 return url; | |
| 89 } | |
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