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1 /* |
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2 Copyright (c) 2009, Yahoo! Inc. All rights reserved. |
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3 Code licensed under the BSD License: |
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4 http://developer.yahoo.net/yui/license.txt |
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5 version: 3.0.0b1 |
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6 build: 1163 |
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7 */ |
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8 YUI.add('get', function(Y) { |
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9 |
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10 (function() { |
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11 |
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12 /** |
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13 * Provides a mechanism to fetch remote resources and |
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14 * insert them into a document. |
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15 * @module yui |
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16 * @submodule get |
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17 */ |
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18 |
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19 var ua = Y.UA, |
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20 L = Y.Lang, |
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21 // PREFIX = Y.guid(), |
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22 TYPE_JS = "text/javascript", |
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23 TYPE_CSS = "text/css", |
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24 STYLESHEET = "stylesheet"; |
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25 |
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26 /** |
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27 * Fetches and inserts one or more script or link nodes into the document |
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28 * @class Get |
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29 * @static |
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30 */ |
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31 Y.Get = function() { |
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32 |
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33 /** |
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34 * hash of queues to manage multiple requests |
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35 * @property queues |
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36 * @private |
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37 */ |
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38 var queues={}, |
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39 |
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40 /** |
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41 * queue index used to generate transaction ids |
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42 * @property qidx |
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43 * @type int |
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44 * @private |
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45 */ |
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46 qidx=0, |
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47 |
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48 /** |
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49 * interal property used to prevent multiple simultaneous purge |
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50 * processes |
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51 * @property purging |
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52 * @type boolean |
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53 * @private |
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54 */ |
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55 purging=false, |
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56 |
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57 |
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58 /** |
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59 * Generates an HTML element, this is not appended to a document |
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60 * @method _node |
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61 * @param type {string} the type of element |
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62 * @param attr {string} the attributes |
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63 * @param win {Window} optional window to create the element in |
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64 * @return {HTMLElement} the generated node |
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65 * @private |
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66 */ |
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67 _node = function(type, attr, win) { |
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68 var w = win || Y.config.win, d=w.document, n=d.createElement(type), |
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69 i; |
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70 |
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71 for (i in attr) { |
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72 if (attr[i] && attr.hasOwnProperty(i)) { |
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73 n.setAttribute(i, attr[i]); |
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74 } |
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75 } |
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76 |
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77 return n; |
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78 }, |
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79 |
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80 /** |
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81 * Generates a link node |
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82 * @method _linkNode |
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83 * @param url {string} the url for the css file |
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84 * @param win {Window} optional window to create the node in |
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85 * @param attributes optional attributes collection to apply to the new node |
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86 * @return {HTMLElement} the generated node |
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87 * @private |
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88 */ |
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89 _linkNode = function(url, win, attributes) { |
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90 var o = { |
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91 id: Y.guid(), |
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92 type: TYPE_CSS, |
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93 rel: STYLESHEET, |
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94 href: url |
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95 }; |
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96 if (attributes) { |
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97 Y.mix(o, attributes); |
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98 } |
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99 return _node("link", o, win); |
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100 }, |
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101 |
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102 /** |
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103 * Generates a script node |
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104 * @method _scriptNode |
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105 * @param url {string} the url for the script file |
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106 * @param win {Window} optional window to create the node in |
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107 * @param attributes optional attributes collection to apply to the new node |
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108 * @return {HTMLElement} the generated node |
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109 * @private |
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110 */ |
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111 _scriptNode = function(url, win, attributes) { |
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112 var o = { |
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113 id: Y.guid(), |
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114 type: TYPE_JS, |
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115 src: url |
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116 }; |
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117 |
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118 if (attributes) { |
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119 Y.mix(o, attributes); |
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120 } |
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121 |
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122 return _node("script", o, win); |
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123 }, |
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124 |
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125 /** |
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126 * Removes the nodes for the specified queue |
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127 * @method _purge |
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128 * @private |
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129 */ |
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130 _purge = function(tId) { |
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131 var q=queues[tId], n, l, d, h, s, i; |
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132 if (q) { |
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133 n = q.nodes; |
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134 l = n.length; |
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135 d = q.win.document; |
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136 h = d.getElementsByTagName("head")[0]; |
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137 |
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138 if (q.insertBefore) { |
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139 s = _get(q.insertBefore, tId); |
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140 if (s) { |
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141 h = s.parentNode; |
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142 } |
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143 } |
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144 |
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145 for (i=0; i<l; i=i+1) { |
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146 h.removeChild(n[i]); |
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147 } |
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148 } |
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149 q.nodes = []; |
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150 }, |
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151 |
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152 /** |
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153 * Returns the data payload for callback functions |
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154 * @method _returnData |
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155 * @private |
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156 */ |
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157 _returnData = function(q, msg, result) { |
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158 return { |
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159 tId: q.tId, |
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160 win: q.win, |
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161 data: q.data, |
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162 nodes: q.nodes, |
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163 msg: msg, |
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164 statusText: result, |
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165 purge: function() { |
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166 _purge(this.tId); |
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167 } |
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168 }; |
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169 }, |
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170 |
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171 /** |
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172 * The transaction is finished |
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173 * @method _end |
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174 * @param id {string} the id of the request |
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175 * @private |
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176 */ |
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177 _end = function(id, msg, result) { |
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178 var q = queues[id], sc; |
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179 if (q && q.onEnd) { |
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180 sc = q.context || q; |
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181 q.onEnd.call(sc, _returnData(q, msg, result)); |
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182 } |
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183 }, |
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184 |
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185 /* |
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186 * The request failed, execute fail handler with whatever |
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187 * was accomplished. There isn't a failure case at the |
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188 * moment unless you count aborted transactions |
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189 * @method _fail |
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190 * @param id {string} the id of the request |
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191 * @private |
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192 */ |
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193 _fail = function(id, msg) { |
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194 |
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195 Y.log("get failure: " + msg, "warn", "get"); |
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196 |
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197 var q = queues[id], sc; |
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198 if (q.timer) { |
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199 q.timer.cancel(); |
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200 } |
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201 |
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202 // execute failure callback |
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203 if (q.onFailure) { |
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204 sc = q.context || q; |
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205 q.onFailure.call(sc, _returnData(q, msg)); |
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206 } |
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207 |
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208 _end(id, msg, 'failure'); |
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209 }, |
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210 |
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211 _get = function(nId, tId) { |
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212 var q = queues[tId], |
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213 n = (L.isString(nId)) ? q.win.document.getElementById(nId) : nId; |
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214 if (!n) { |
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215 _fail(tId, "target node not found: " + nId); |
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216 } |
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217 |
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218 return n; |
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219 }, |
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220 |
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221 /** |
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222 * The request is complete, so executing the requester's callback |
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223 * @method _finish |
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224 * @param id {string} the id of the request |
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225 * @private |
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226 */ |
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227 _finish = function(id) { |
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228 Y.log("Finishing transaction " + id, "info", "get"); |
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229 var q = queues[id], msg, sc; |
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230 if (q.timer) { |
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231 q.timer.cancel(); |
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232 } |
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233 q.finished = true; |
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234 |
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235 if (q.aborted) { |
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236 msg = "transaction " + id + " was aborted"; |
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237 _fail(id, msg); |
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238 return; |
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239 } |
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240 |
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241 // execute success callback |
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242 if (q.onSuccess) { |
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243 sc = q.context || q; |
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244 q.onSuccess.call(sc, _returnData(q)); |
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245 } |
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246 |
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247 _end(id, msg, 'OK'); |
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248 }, |
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249 |
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250 /** |
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251 * Timeout detected |
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252 * @method _timeout |
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253 * @param id {string} the id of the request |
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254 * @private |
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255 */ |
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256 _timeout = function(id) { |
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257 Y.log("Timeout " + id, "info", "get"); |
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258 var q = queues[id], sc; |
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259 if (q.onTimeout) { |
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260 sc = q.context || q; |
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261 q.onTimeout.call(sc, _returnData(q)); |
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262 } |
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263 |
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264 _end(id, 'timeout', 'timeout'); |
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265 }, |
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266 |
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267 |
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268 /** |
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269 * Loads the next item for a given request |
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270 * @method _next |
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271 * @param id {string} the id of the request |
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272 * @param loaded {string} the url that was just loaded, if any |
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273 * @private |
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274 */ |
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275 _next = function(id, loaded) { |
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276 |
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277 Y.log("_next: " + id + ", loaded: " + (loaded || "nothing"), "info", "get"); |
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278 |
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279 var q = queues[id], msg, w, d, h, n, url, s; |
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280 |
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281 if (q.timer) { |
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282 // Y.log('cancel timer'); |
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283 q.timer.cancel(); |
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284 } |
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285 |
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286 if (q.aborted) { |
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287 msg = "transaction " + id + " was aborted"; |
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288 _fail(id, msg); |
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289 return; |
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290 } |
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291 |
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292 if (loaded) { |
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293 q.url.shift(); |
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294 if (q.varName) { |
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295 q.varName.shift(); |
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296 } |
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297 } else { |
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298 // This is the first pass: make sure the url is an array |
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299 q.url = (L.isString(q.url)) ? [q.url] : q.url; |
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300 if (q.varName) { |
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301 q.varName = (L.isString(q.varName)) ? [q.varName] : q.varName; |
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302 } |
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303 } |
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304 |
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305 w = q.win; |
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306 d = w.document; |
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307 h = d.getElementsByTagName("head")[0]; |
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308 |
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309 if (q.url.length === 0) { |
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310 _finish(id); |
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311 return; |
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312 } |
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313 |
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314 url = q.url[0]; |
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315 |
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316 // if the url is undefined, this is probably a trailing comma problem in IE |
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317 if (!url) { |
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318 q.url.shift(); |
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319 Y.log('skipping empty url'); |
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320 return _next(id); |
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321 } |
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322 |
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323 Y.log("attempting to load " + url, "info", "get"); |
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324 |
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325 if (q.timeout) { |
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326 // Y.log('create timer'); |
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327 q.timer = L.later(q.timeout, q, _timeout, id); |
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328 } |
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329 |
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330 if (q.type === "script") { |
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331 n = _scriptNode(url, w, q.attributes); |
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332 } else { |
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333 n = _linkNode(url, w, q.attributes); |
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334 } |
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335 |
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336 // track this node's load progress |
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337 _track(q.type, n, id, url, w, q.url.length); |
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338 |
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339 // add the node to the queue so we can return it to the user supplied callback |
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340 q.nodes.push(n); |
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341 |
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342 // add it to the head or insert it before 'insertBefore' |
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343 if (q.insertBefore) { |
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344 s = _get(q.insertBefore, id); |
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345 if (s) { |
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346 s.parentNode.insertBefore(n, s); |
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347 } |
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348 } else { |
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349 h.appendChild(n); |
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350 } |
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351 |
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352 Y.log("Appending node: " + url, "info", "get"); |
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353 |
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354 // FireFox does not support the onload event for link nodes, so there is |
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355 // no way to make the css requests synchronous. This means that the css |
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356 // rules in multiple files could be applied out of order in this browser |
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357 // if a later request returns before an earlier one. Safari too. |
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358 if ((ua.webkit || ua.gecko) && q.type === "css") { |
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359 _next(id, url); |
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360 } |
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361 }, |
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362 |
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363 /** |
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364 * Removes processed queues and corresponding nodes |
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365 * @method _autoPurge |
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366 * @private |
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367 */ |
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368 _autoPurge = function() { |
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369 |
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370 if (purging) { |
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371 return; |
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372 } |
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373 |
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374 purging = true; |
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375 |
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376 var i, q; |
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377 |
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378 for (i in queues) { |
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379 if (queues.hasOwnProperty(i)) { |
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380 q = queues[i]; |
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381 if (q.autopurge && q.finished) { |
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382 _purge(q.tId); |
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383 delete queues[i]; |
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384 } |
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385 } |
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386 } |
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387 |
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388 purging = false; |
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389 }, |
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390 |
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391 /** |
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392 * Saves the state for the request and begins loading |
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393 * the requested urls |
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394 * @method queue |
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395 * @param type {string} the type of node to insert |
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396 * @param url {string} the url to load |
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397 * @param opts the hash of options for this request |
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398 * @private |
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399 */ |
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400 _queue = function(type, url, opts) { |
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401 |
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402 opts = opts || {}; |
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403 |
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404 var id = "q" + (qidx++), q, |
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405 thresh = opts.purgethreshold || Y.Get.PURGE_THRESH; |
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406 |
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407 if (qidx % thresh === 0) { |
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408 _autoPurge(); |
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409 } |
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410 |
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411 queues[id] = Y.merge(opts, { |
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412 tId: id, |
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413 type: type, |
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414 url: url, |
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415 finished: false, |
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416 nodes: [] |
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417 }); |
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418 |
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419 q = queues[id]; |
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420 q.win = q.win || Y.config.win; |
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421 q.context = q.context || q; |
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422 q.autopurge = ("autopurge" in q) ? q.autopurge : |
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423 (type === "script") ? true : false; |
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424 |
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425 if (opts.charset) { |
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426 q.attributes = q.attributes || {}; |
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427 q.attributes.charset = opts.charset; |
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428 } |
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429 |
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430 L.later(0, q, _next, id); |
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431 |
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432 return { |
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433 tId: id |
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434 }; |
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435 }, |
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436 |
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437 /** |
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438 * Detects when a node has been loaded. In the case of |
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439 * script nodes, this does not guarantee that contained |
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440 * script is ready to use. |
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441 * @method _track |
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442 * @param type {string} the type of node to track |
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443 * @param n {HTMLElement} the node to track |
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444 * @param id {string} the id of the request |
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445 * @param url {string} the url that is being loaded |
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446 * @param win {Window} the targeted window |
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447 * @param qlength the number of remaining items in the queue, |
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448 * including this one |
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449 * @param trackfn {Function} function to execute when finished |
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450 * the default is _next |
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451 * @private |
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452 */ |
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453 _track = function(type, n, id, url, win, qlength, trackfn) { |
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454 var f = trackfn || _next; |
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455 |
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456 // IE supports the readystatechange event for script and css nodes |
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457 // Opera only for script nodes. Opera support onload for script |
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458 // nodes, but this doesn't fire when there is a load failure. |
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459 // The onreadystatechange appears to be a better way to respond |
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460 // to both success and failure. |
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461 if (ua.ie) { |
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462 n.onreadystatechange = function() { |
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463 var rs = this.readyState; |
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464 if ("loaded" === rs || "complete" === rs) { |
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465 Y.log(id + " onreadstatechange " + url, "info", "get"); |
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466 n.onreadystatechange = null; |
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467 f(id, url); |
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468 } |
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469 }; |
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470 |
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471 // webkit prior to 3.x is no longer supported |
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472 } else if (ua.webkit) { |
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473 |
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474 if (type === "script") { |
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475 // Safari 3.x supports the load event for script nodes (DOM2) |
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476 n.addEventListener("load", function() { |
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477 Y.log(id + " DOM2 onload " + url, "info", "get"); |
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478 f(id, url); |
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479 }); |
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480 } |
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481 |
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482 // FireFox and Opera support onload (but not DOM2 in FF) handlers for |
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483 // script nodes. Opera, but not FF, supports the onload event for link |
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484 // nodes. |
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485 } else { |
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486 |
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487 n.onload = function() { |
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488 Y.log(id + " onload " + url, "info", "get"); |
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489 f(id, url); |
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490 }; |
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491 |
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492 n.onerror = function(e) { |
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493 _fail(id, e + ": " + url); |
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494 }; |
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495 } |
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496 }; |
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497 |
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498 return { |
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499 |
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500 /** |
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501 * The number of request required before an automatic purge. |
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502 * Can be configured via the 'purgethreshold' config |
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503 * property PURGE_THRESH |
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504 * @static |
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505 * @type int |
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506 * @default 20 |
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507 * @private |
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508 */ |
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509 PURGE_THRESH: 20, |
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510 |
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511 /** |
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512 * Called by the the helper for detecting script load in Safari |
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513 * @method _finalize |
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514 * @static |
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515 * @param id {string} the transaction id |
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516 * @private |
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517 */ |
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518 _finalize: function(id) { |
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519 Y.log(id + " finalized ", "info", "get"); |
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520 L.later(0, null, _finish, id); |
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521 }, |
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522 |
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523 /** |
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524 * Abort a transaction |
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525 * @method abort |
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526 * @static |
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527 * @param o {string|object} Either the tId or the object returned from |
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528 * script() or css() |
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529 */ |
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530 abort: function(o) { |
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531 var id = (L.isString(o)) ? o : o.tId, |
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532 q = queues[id]; |
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533 if (q) { |
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534 Y.log("Aborting " + id, "info", "get"); |
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535 q.aborted = true; |
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536 } |
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537 }, |
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538 |
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539 /** |
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540 * Fetches and inserts one or more script nodes into the head |
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541 * of the current document or the document in a specified window. |
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542 * |
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543 * @method script |
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544 * @static |
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545 * @param url {string|string[]} the url or urls to the script(s) |
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546 * @param opts {object} Options: |
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547 * <dl> |
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548 * <dt>onSuccess</dt> |
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549 * <dd> |
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550 * callback to execute when the script(s) are finished loading |
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551 * The callback receives an object back with the following |
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552 * data: |
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553 * <dl> |
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554 * <dt>win</dt> |
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555 * <dd>the window the script(s) were inserted into</dd> |
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556 * <dt>data</dt> |
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557 * <dd>the data object passed in when the request was made</dd> |
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558 * <dt>nodes</dt> |
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559 * <dd>An array containing references to the nodes that were |
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560 * inserted</dd> |
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561 * <dt>purge</dt> |
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562 * <dd>A function that, when executed, will remove the nodes |
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563 * that were inserted</dd> |
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564 * <dt> |
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565 * </dl> |
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566 * </dd> |
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567 * <dt>onTimeout</dt> |
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568 * <dd> |
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569 * callback to execute when a timeout occurs. |
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570 * The callback receives an object back with the following |
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571 * data: |
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572 * <dl> |
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573 * <dt>win</dt> |
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574 * <dd>the window the script(s) were inserted into</dd> |
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575 * <dt>data</dt> |
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576 * <dd>the data object passed in when the request was made</dd> |
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577 * <dt>nodes</dt> |
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578 * <dd>An array containing references to the nodes that were |
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579 * inserted</dd> |
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580 * <dt>purge</dt> |
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581 * <dd>A function that, when executed, will remove the nodes |
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582 * that were inserted</dd> |
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583 * <dt> |
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584 * </dl> |
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585 * </dd> |
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586 * <dt>onEnd</dt> |
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587 * <dd>a function that executes when the transaction finishes, regardless of the exit path</dd> |
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588 * <dt>onFailure</dt> |
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589 * <dd> |
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590 * callback to execute when the script load operation fails |
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591 * The callback receives an object back with the following |
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592 * data: |
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593 * <dl> |
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594 * <dt>win</dt> |
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595 * <dd>the window the script(s) were inserted into</dd> |
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596 * <dt>data</dt> |
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597 * <dd>the data object passed in when the request was made</dd> |
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598 * <dt>nodes</dt> |
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599 * <dd>An array containing references to the nodes that were |
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600 * inserted successfully</dd> |
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601 * <dt>purge</dt> |
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602 * <dd>A function that, when executed, will remove any nodes |
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603 * that were inserted</dd> |
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604 * <dt> |
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605 * </dl> |
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606 * </dd> |
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607 * <dt>context</dt> |
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608 * <dd>the execution context for the callbacks</dd> |
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609 * <dt>win</dt> |
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610 * <dd>a window other than the one the utility occupies</dd> |
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611 * <dt>autopurge</dt> |
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612 * <dd> |
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613 * setting to true will let the utilities cleanup routine purge |
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614 * the script once loaded |
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615 * </dd> |
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616 * <dt>purgethreshold</dt> |
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617 * <dd> |
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618 * The number of transaction before autopurge should be initiated |
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619 * </dd> |
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620 * <dt>data</dt> |
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621 * <dd> |
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622 * data that is supplied to the callback when the script(s) are |
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623 * loaded. |
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624 * </dd> |
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625 * <dt>insertBefore</dt> |
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626 * <dd>node or node id that will become the new node's nextSibling</dd> |
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627 * </dl> |
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628 * <dt>charset</dt> |
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629 * <dd>Node charset, default utf-8 (deprecated, use the attributes config)</dd> |
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630 * <dt>attributes</dt> |
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631 * <dd>An object literal containing additional attributes to add to the link tags</dd> |
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632 * <dt>timeout</dt> |
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633 * <dd>Number of milliseconds to wait before aborting and firing the timeout event</dd> |
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634 * <pre> |
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635 * Y.Get.script( |
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636 * ["http://yui.yahooapis.com/2.5.2/build/yahoo/yahoo-min.js", |
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637 * "http://yui.yahooapis.com/2.5.2/build/event/event-min.js"], { |
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638 * onSuccess: function(o) { |
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639 * this.log("won't cause error because Y is the context"); |
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640 * Y.log(o.data); // foo |
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641 * Y.log(o.nodes.length === 2) // true |
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642 * // o.purge(); // optionally remove the script nodes immediately |
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643 * }, |
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644 * onFailure: function(o) { |
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645 * Y.log("transaction failed"); |
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646 * }, |
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647 * onTimeout: function(o) { |
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648 * Y.log("transaction timed out"); |
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649 * }, |
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650 * data: "foo", |
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651 * timeout: 10000, // 10 second timeout |
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652 * context: Y, // make the YUI instance |
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653 * // win: otherframe // target another window/frame |
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654 * autopurge: true // allow the utility to choose when to remove the nodes |
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655 * purgetheshold: 1 // purge previous transaction before next transaction |
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656 * }); |
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657 * </pre> |
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658 * @return {tId: string} an object containing info about the transaction |
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659 */ |
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660 script: function(url, opts) { |
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661 return _queue("script", url, opts); |
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662 }, |
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663 |
|
664 /** |
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665 * Fetches and inserts one or more css link nodes into the |
|
666 * head of the current document or the document in a specified |
|
667 * window. |
|
668 * @method css |
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669 * @static |
|
670 * @param url {string} the url or urls to the css file(s) |
|
671 * @param opts Options: |
|
672 * <dl> |
|
673 * <dt>onSuccess</dt> |
|
674 * <dd> |
|
675 * callback to execute when the css file(s) are finished loading |
|
676 * The callback receives an object back with the following |
|
677 * data: |
|
678 * <dl>win</dl> |
|
679 * <dd>the window the link nodes(s) were inserted into</dd> |
|
680 * <dt>data</dt> |
|
681 * <dd>the data object passed in when the request was made</dd> |
|
682 * <dt>nodes</dt> |
|
683 * <dd>An array containing references to the nodes that were |
|
684 * inserted</dd> |
|
685 * <dt>purge</dt> |
|
686 * <dd>A function that, when executed, will remove the nodes |
|
687 * that were inserted</dd> |
|
688 * <dt> |
|
689 * </dl> |
|
690 * </dd> |
|
691 * <dt>context</dt> |
|
692 * <dd>the execution context for the callbacks</dd> |
|
693 * <dt>win</dt> |
|
694 * <dd>a window other than the one the utility occupies</dd> |
|
695 * <dt>data</dt> |
|
696 * <dd> |
|
697 * data that is supplied to the callbacks when the nodes(s) are |
|
698 * loaded. |
|
699 * </dd> |
|
700 * <dt>insertBefore</dt> |
|
701 * <dd>node or node id that will become the new node's nextSibling</dd> |
|
702 * <dt>charset</dt> |
|
703 * <dd>Node charset, default utf-8 (deprecated, use the attributes config)</dd> |
|
704 * <dt>attributes</dt> |
|
705 * <dd>An object literal containing additional attributes to add to the link tags</dd> |
|
706 * </dl> |
|
707 * <pre> |
|
708 * Y.Get.css("http://yui.yahooapis.com/2.3.1/build/menu/assets/skins/sam/menu.css"); |
|
709 * </pre> |
|
710 * <pre> |
|
711 * Y.Get.css( |
|
712 * ["http://yui.yahooapis.com/2.3.1/build/menu/assets/skins/sam/menu.css", |
|
713 * "http://yui.yahooapis.com/2.3.1/build/logger/assets/skins/sam/logger.css"], { |
|
714 * insertBefore: 'custom-styles' // nodes will be inserted before the specified node |
|
715 * }); |
|
716 * </pre> |
|
717 * @return {tId: string} an object containing info about the transaction |
|
718 */ |
|
719 css: function(url, opts) { |
|
720 return _queue("css", url, opts); |
|
721 } |
|
722 }; |
|
723 }(); |
|
724 |
|
725 })(); |
|
726 |
|
727 |
|
728 }, '3.0.0b1' ); |