weekly release 3.3dev
[moodle.git] / lib / amd / src / ajax.js
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1// This file is part of Moodle - http://moodle.org/
2//
3// Moodle is free software: you can redistribute it and/or modify
4// it under the terms of the GNU General Public License as published by
5// the Free Software Foundation, either version 3 of the License, or
6// (at your option) any later version.
7//
8// Moodle is distributed in the hope that it will be useful,
9// but WITHOUT ANY WARRANTY; without even the implied warranty of
10// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11// GNU General Public License for more details.
12//
13// You should have received a copy of the GNU General Public License
14// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
15
16/**
17 * Standard Ajax wrapper for Moodle. It calls the central Ajax script,
18 * which can call any existing webservice using the current session.
19 * In addition, it can batch multiple requests and return multiple responses.
20 *
21 * @module core/ajax
9bdcf579 22 * @class ajax
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23 * @package core
24 * @copyright 2015 Damyon Wiese <damyon@moodle.com>
25 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
9bdcf579 26 * @since 2.9
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27 */
28define(['jquery', 'core/config'], function($, config) {
29
30 /**
31 * Success handler. Called when the ajax call succeeds. Checks each response and
32 * resolves or rejects the deferred from that request.
33 *
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34 * @method requestSuccess
35 * @private
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36 * @param {Object[]} responses Array of responses containing error, exception and data attributes.
37 */
38 var requestSuccess = function(responses) {
39 // Call each of the success handlers.
40 var requests = this;
41 var exception = null;
42 var i = 0;
43 var request;
44 var response;
45
46 for (i = 0; i < requests.length; i++) {
47 request = requests[i];
48
49 response = responses[i];
50 // We may not have responses for all the requests.
51 if (typeof response !== "undefined") {
52 if (response.error === false) {
53 // Call the done handler if it was provided.
54 request.deferred.resolve(response.data);
55 } else {
56 exception = response.exception;
57 break;
58 }
59 } else {
60 // This is not an expected case.
61 exception = new Error('missing response');
62 break;
63 }
64 }
65 // Something failed, reject the remaining promises.
66 if (exception !== null) {
67 for (; i < requests.length; i++) {
68 request = requests[i];
69 request.deferred.reject(exception);
70 }
71 }
72 };
73
74 /**
75 * Fail handler. Called when the ajax call fails. Rejects all deferreds.
76 *
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77 * @method requestFail
78 * @private
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79 * @param {jqXHR} jqXHR The ajax object.
80 * @param {string} textStatus The status string.
81 */
82 var requestFail = function(jqXHR, textStatus) {
83 // Reject all the promises.
84 var requests = this;
85
86 var i = 0;
87 for (i = 0; i < requests.length; i++) {
88 var request = requests[i];
89
3d6ae65b 90 request.deferred.reject(textStatus);
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91 }
92 };
93
94 return /** @alias module:core/ajax */ {
95 // Public variables and functions.
96 /**
97 * Make a series of ajax requests and return all the responses.
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98 *
99 * @method call
c96f55e6 100 * @param {Object[]} requests Array of requests with each containing methodname and args properties.
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101 * done and fail callbacks can be set for each element in the array, or the
102 * can be attached to the promises returned by this function.
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103 * @param {Boolean} async Optional, defaults to true.
104 * If false - this function will not return until the promises are resolved.
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105 * @param {Boolean} loginrequired Optional, defaults to true.
106 * If false - this function will call the faster nologin ajax script - but
107 * will fail unless all functions have been marked as 'loginrequired' => false
108 * in services.php
9bdcf579 109 * @return {Promise[]} Array of promises that will be resolved when the ajax call returns.
72f8324e 110 */
ba224fb4 111 call: function(requests, async, loginrequired) {
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112 var ajaxRequestData = [],
113 i,
114 promises = [];
9bdcf579 115
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116 if (typeof loginrequired === "undefined") {
117 loginrequired = true;
118 }
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119 if (typeof async === "undefined") {
120 async = true;
121 }
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122 for (i = 0; i < requests.length; i++) {
123 var request = requests[i];
124 ajaxRequestData.push({
125 index: i,
126 methodname: request.methodname,
127 args: request.args
128 });
129 request.deferred = $.Deferred();
130 promises.push(request.deferred.promise());
131 // Allow setting done and fail handlers as arguments.
132 // This is just a shortcut for the calling code.
133 if (typeof request.done !== "undefined") {
134 request.deferred.done(request.done);
135 }
136 if (typeof request.fail !== "undefined") {
137 request.deferred.fail(request.fail);
138 }
139 request.index = i;
140 }
141
142 ajaxRequestData = JSON.stringify(ajaxRequestData);
143 var settings = {
144 type: 'POST',
145 data: ajaxRequestData,
146 context: requests,
147 dataType: 'json',
9bdcf579 148 processData: false,
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149 async: async,
150 contentType: "application/json"
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151 };
152
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153 var script = config.wwwroot + '/lib/ajax/service.php?sesskey=' + config.sesskey;
154 if (!loginrequired) {
155 script = config.wwwroot + '/lib/ajax/service-nologin.php?sesskey=' + config.sesskey;
156 }
157
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158 // Jquery deprecated done and fail with async=false so we need to do this 2 ways.
159 if (async) {
ba224fb4 160 $.ajax(script, settings)
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161 .done(requestSuccess)
162 .fail(requestFail);
163 } else {
164 settings.success = requestSuccess;
165 settings.error = requestFail;
ba224fb4 166 $.ajax(script, settings);
9bdcf579 167 }
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168
169 return promises;
170 }
171 };
172});