├── COPYING └── control.js /COPYING: -------------------------------------------------------------------------------- 1 | 2 | Apache License 3 | Version 2.0, January 2004 4 | http://www.apache.org/licenses/ 5 | 6 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 7 | 8 | 1. Definitions. 9 | 10 | "License" shall mean the terms and conditions for use, reproduction, 11 | and distribution as defined by Sections 1 through 9 of this document. 12 | 13 | "Licensor" shall mean the copyright owner or entity authorized by 14 | the copyright owner that is granting the License. 15 | 16 | "Legal Entity" shall mean the union of the acting entity and all 17 | other entities that control, are controlled by, or are under common 18 | control with that entity. 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We also recommend that a 186 | file or class name and description of purpose be included on the 187 | same "printed page" as the copyright notice for easier 188 | identification within third-party archives. 189 | 190 | Copyright [yyyy] [name of copyright owner] 191 | 192 | Licensed under the Apache License, Version 2.0 (the "License"); 193 | you may not use this file except in compliance with the License. 194 | You may obtain a copy of the License at 195 | 196 | http://www.apache.org/licenses/LICENSE-2.0 197 | 198 | Unless required by applicable law or agreed to in writing, software 199 | distributed under the License is distributed on an "AS IS" BASIS, 200 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 201 | See the License for the specific language governing permissions and 202 | limitations under the License. 203 | -------------------------------------------------------------------------------- /control.js: -------------------------------------------------------------------------------- 1 | /* 2 | Copyright 2010 Google Inc. 3 | 4 | Licensed under the Apache License, Version 2.0 (the "License"); 5 | you may not use this file except in compliance with the License. 6 | You may obtain a copy of the License at 7 | 8 | http://www.apache.org/licenses/LICENSE-2.0 9 | 10 | Unless required by applicable law or agreed to in writing, software 11 | distributed under the License is distributed on an "AS IS" BASIS, 12 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 | See the License for the specific language governing permissions and 14 | limitations under the License. 15 | */ 16 | 17 | /******************************************************************************* 18 | ControlJS - a JavaScript module for loading scripts faster. 19 | - home page: http://stevesouders.com/controljs/ 20 | - code project: http://code.google.com/p/controljs/ 21 | - discussion list: http://groups.google.com/group/controljs 22 | *******************************************************************************/ 23 | 24 | var CJS = CJS || {}; 25 | 26 | CJS.start = function() { 27 | CJS.init(); 28 | 29 | // Find all the script DOM elements that have been modified for ControlJS. 30 | CJS.findScripts(); 31 | 32 | // Start scripts downloading in the background ASAP. 33 | CJS.downloadScripts(); 34 | 35 | // Process scripts now or later depending on the defer setting. 36 | if ( CJS.defer ) { 37 | // It's possible that window.onload already fired, in which case we 38 | // need to kickoff processScripts immediately. 39 | if ( "undefined" != typeof(document.readyState) && "complete" === document.readyState ) { 40 | CJS.processScripts(); 41 | } 42 | else { 43 | CJS.addHandler(window, 'load', CJS.processScripts); 44 | } 45 | } 46 | else { 47 | // TODO - We need to add a mechanism to do multiple passes before 48 | // we support calling processScripts before the DOM is complete. 49 | alert("Immediate processing is not currently supported."); 50 | CJS.processScripts(); 51 | } 52 | }; 53 | 54 | 55 | // Find all scripts with a "text/cjs" type. 56 | CJS.findScripts = function() { 57 | var aScripts = document.getElementsByTagName('script'); 58 | var len = aScripts.length; 59 | for ( var i = 0; i < len; i++ ) { 60 | var script = aScripts[i]; 61 | if ( "text/cjs" === CJS.getAttribute(script, "type") && "undefined" === typeof(script.cjsfound) ) { 62 | CJS.aScripts[CJS.aScripts.length] = script; 63 | script.cjsfound = true; // mark the script as found so we can do a second pass later 64 | } 65 | } 66 | //CJS.dprint("found " + CJS.aScripts.length + " CJS scripts"); 67 | }; 68 | 69 | 70 | // 71 | // DOWNLOAD PHASE 72 | // 73 | 74 | // Find all scripts with a "data-cjssrc" attribute. 75 | CJS.downloadScripts = function() { 76 | var len = CJS.aScripts.length; 77 | for ( var i = 0; i < len; i++ ) { 78 | var script = CJS.aScripts[i]; 79 | var src = CJS.getAttribute(script, "data-cjssrc") || CJS.getAttribute(script, "cjssrc"); // backward compatible to earlier "cjssrc" attribute 80 | if ( src ) { 81 | CJS.downloadScript(src); 82 | } 83 | } 84 | }; 85 | 86 | 87 | // Download a script in such a way that it's not executed immediately. 88 | CJS.downloadScript = function(url) { 89 | CJS.dprint("downloading " + url); 90 | 91 | if ( CJS.bIE || CJS.bOpera ) { 92 | CJS.downloadScriptImage(url); 93 | } 94 | else { 95 | CJS.downloadScriptObject(url); 96 | } 97 | }; 98 | 99 | 100 | // Download a script as an image. 101 | // This puts it in the browser's cache, but doesn't execute it. 102 | CJS.downloadScriptImage = function(url) { 103 | var img = new Image(); 104 | img.onload = function() { CJS.onloadCallback(url); }; 105 | img.onerror = function() { CJS.onloadCallback(url); }; // Chrome does onerror (not onload). 106 | img.src = url; 107 | }; 108 | 109 | 110 | // Download a script as an object. 111 | // This puts it in the browser's cache, but doesn't execute it. 112 | // Based on http://www.phpied.com/preload-cssjavascript-without-execution/ 113 | CJS.downloadScriptObject = function(url) { 114 | if ( "undefined" === typeof(document.body) || ! document.body ) { 115 | // we need body for appending objects 116 | setTimeout("CJS.downloadScriptObject('" + url + "')", 50); 117 | return; 118 | } 119 | 120 | var obj = document.createElement('object'); 121 | obj.data = url; 122 | obj.width = 0; 123 | obj.height = 0; 124 | obj.onload = function() { CJS.onloadCallback(url); }; 125 | obj.onerror = function() { CJS.onloadCallback(url); }; 126 | //CJS.dprint("downloadScriptObject: appending " + url); 127 | document.body.appendChild(obj); 128 | }; 129 | 130 | 131 | CJS.onloadCallback = function(url) { 132 | //CJS.dprint("onloadCallback: " + url); 133 | CJS.hLoaded[url] = true; 134 | }; 135 | 136 | 137 | CJS.execCallback = function(url) { 138 | CJS.dprint("execCallback: " + url); 139 | 140 | if ( 0 === CJS.aExecs.length ) { 141 | CJS.dprint("ERROR: We finished executing a script but the exec queue is empty: " + url); 142 | return; 143 | } 144 | 145 | if ( url == CJS.aExecs[0][0] ) { 146 | CJS.aExecs.splice(0, 1); // remove leading URL 147 | } 148 | else { 149 | CJS.dprint("ERROR: We finished executing a script that wasn't on the queue: " + url); 150 | } 151 | 152 | if ( CJS.aExecs.length ) { 153 | // execute the next script on the queue 154 | CJS.execScript(CJS.aExecs[0][0], CJS.aExecs[0][1]); 155 | } 156 | }; 157 | 158 | 159 | 160 | 161 | 162 | // 163 | // EXECUTION PHASE 164 | // 165 | 166 | CJS.processScripts = function() { 167 | CJS.processNextScript(); 168 | }; 169 | 170 | 171 | CJS.processNextScript = function() { 172 | //CJS.dprint("processNextScript: enter"); 173 | if ( CJS.aScripts.length ) { 174 | var script = CJS.aScripts[0]; 175 | CJS.curScript = script; // for docwrite 176 | 177 | var src = CJS.getAttribute(script, "data-cjssrc") || CJS.getAttribute(script, "cjssrc"); // backward compatible to earlier "cjssrc" attribute 178 | var cjsexec = CJS.getAttribute(script, "data-cjsexec") || CJS.getAttribute(script, "cjsexec"); // backward compatible to earlier "cjsexec" attribute 179 | if ( src ) { 180 | // External Script 181 | if ( "false" === cjsexec ) { 182 | CJS.aScripts.splice(0, 1); // remove leading script 183 | setTimeout(CJS.processNextScript, 0); 184 | } 185 | else if ( CJS.hLoaded[src] ) { 186 | // Done downloading. 187 | CJS.processExternalScript(script, CJS.processNextScript); 188 | CJS.aScripts.splice(0, 1); // remove leading script 189 | // Race condition! Need to call processNextScript from the onload handler 190 | // of the script added down inside processExternalScript. (Notice the 191 | // callback added above when calling processExternalScript.) 192 | //setTimeout(CJS.processNextScript, 0); 193 | } 194 | else { 195 | // Still downloading. 196 | CJS.dprint("processNextScript: waiting for script " + src); 197 | if ( "undefined" === typeof(script.startwait) ) { 198 | script.startwait = Number(new Date()); // start time 199 | } 200 | var delta = Number(new Date()) - script.startwait; 201 | if ( delta < CJS.maxWait ) { 202 | // try again 203 | setTimeout(CJS.processNextScript, CJS.waitival); 204 | } 205 | else { 206 | // bail 207 | alert("There was an error loading script: " + src); 208 | } 209 | } 210 | } 211 | else { 212 | // Inline Script 213 | CJS.processInlineScript(script); 214 | CJS.aScripts.splice(0, 1); // remove leading script 215 | setTimeout(CJS.processNextScript, 0); 216 | } 217 | 218 | return; 219 | } 220 | 221 | // Do a 2nd pass looking for CJS scripts. 222 | // Because control.js loads async, it's possible for findScripts to be 223 | // be called before all SCRIPT tags have been created. 224 | CJS.findScripts(); 225 | if ( CJS.aScripts.length ) { 226 | CJS.downloadScripts(); 227 | setTimeout(CJS.processNextScript, 0); 228 | return; 229 | } 230 | 231 | // restore the original document.write function definition 232 | document.write = CJS.docwriteOrig; 233 | 234 | CJS.dprint("DONE processing scripts"); 235 | 236 | /* 237 | TODO - We can try something like this to re-fire the window load event. 238 | var eventObj = document.createEvent("HTMLEvents"); 239 | eventObj.initEvent("load", true, true); 240 | window.dispatchEvent(eventObj); 241 | */ 242 | }; 243 | 244 | 245 | // Eval the code in an inlined script. 246 | CJS.processInlineScript = function(script) { 247 | //CJS.dprint("processInlineScript: enter"); 248 | CJS.curScript = script; // for docwrite 249 | 250 | var code = script.text; 251 | CJS.dprint("processInlineScript: processing script code: " + code.substring(0, 64)); 252 | CJS.eval(code); 253 | }; 254 | 255 | 256 | // If downloaded then add the external script as a real script DOM element. 257 | CJS.processExternalScript = function(script, callback) { 258 | //CJS.dprint("processExternalScript: enter"); 259 | 260 | var src = CJS.getAttribute(script, "data-cjssrc") || CJS.getAttribute(script, "cjssrc"); // backward compatible to earlier "cjssrc" attribute 261 | CJS.dprint("processExternalScript: processing script " + src); 262 | CJS.execScript(src, callback); 263 | }; 264 | 265 | 266 | // Insert a script DOM element. 267 | // Presumably the src has already been downloaded and is in the cache. 268 | CJS.execScript = function(src, onload) { 269 | CJS.dprint("execScript: " + src); 270 | 271 | if ( 0 === CJS.aExecs.length ) { 272 | // Add this to the queue and continue on to execute it. 273 | CJS.aExecs[CJS.aExecs.length] = [src, onload]; 274 | } 275 | else if ( src != CJS.aExecs[0][0] ) { 276 | // If there's an execution queue and this SRC isn't first, try later. 277 | CJS.dprint("execScript: queueing for later: " + src); 278 | CJS.aExecs[CJS.aExecs.length] = [src, onload]; 279 | return; 280 | } 281 | 282 | // convert the onload parameter from function or string into a function 283 | var fonload = ( function(ponload) { 284 | switch ( typeof(ponload) ) { 285 | case "string": 286 | ponload = new Function(ponload); 287 | break; 288 | case "function": 289 | // ponload is already a function 290 | break; 291 | default: 292 | ponload = new Function(); 293 | } 294 | return ponload; 295 | 296 | })(onload); 297 | 298 | // single function that works with onload and onreadystatechange 299 | var func = function() { 300 | if ( this.readyState && this.readyState != "complete" && this.readyState != "loaded" ) { 301 | return; 302 | } 303 | CJS.execCallback(src); 304 | this.onload = this.onreadystatechange = null; // ensure callback is only called once 305 | fonload(); 306 | }; 307 | 308 | // Add a SCRIPT element pointing to the (already cached) src so the JS gets executed. 309 | var se = document.createElement('script'); 310 | se.onload = se.onreadystatechange = func; // set this BEFORE setting .src 311 | se.src = src; 312 | var s1 = document.getElementsByTagName('script')[0]; 313 | s1.parentNode.insertBefore(se, s1); 314 | }; 315 | 316 | 317 | // Eval a string of JavaScript in the proper context. 318 | CJS.eval = function(code) { 319 | //CJS.dprint("evaling: " + code.substring(0, 64)); 320 | 321 | if (window.execScript) { 322 | window.execScript(code); 323 | } 324 | else { 325 | var fn = function() { 326 | window.eval.call(window, code); 327 | }; 328 | fn(); 329 | } 330 | 331 | //CJS.dprint("eval exit"); 332 | }; 333 | 334 | 335 | 336 | 337 | 338 | 339 | // 340 | // UTILITY FUNCTIONS 341 | // 342 | 343 | CJS.init = function() { 344 | CJS.bInited = true; // don't init twice 345 | 346 | // If defer is true then scripts aren't loaded until the onload event. 347 | CJS.defer = ( "undefined" === typeof(CJS.defer) ? true : CJS.defer ); 348 | 349 | CJS.aScripts = []; // array of CJS script DOM elements 350 | CJS.hLoaded = {}; // hash of script URLs that have loaded 351 | CJS.aExecs = []; // array of script URLs to execute 352 | 353 | CJS.bIE = ( -1 != navigator.userAgent.indexOf('MSIE') ); 354 | CJS.bChrome = ( -1 != navigator.userAgent.indexOf('Chrome/') ); 355 | CJS.bOpera = ( -1 != navigator.userAgent.indexOf('Opera') ); 356 | 357 | CJS.curScript = null; // for document.write 358 | 359 | CJS.maxWait = 5000; // maximum number of milliseconds to wait for a script to download 360 | CJS.waitival = 200; // number of milliseconds to wait between retries of looking for external script download 361 | 362 | CJS.docwriteOrig = document.write; // keep a reference to the original function 363 | document.write = CJS.docwrite; // override document.write 364 | }; 365 | 366 | 367 | // Return the URL of the script that has been converted to CJS. 368 | CJS.getAttribute = function(elem, name) { 369 | var attrs = elem.attributes; 370 | var len = attrs.length; 371 | for ( var i = 0; i < len; i++ ) { 372 | var attr = attrs[i]; 373 | if ( name === attr.nodeName ) { 374 | return attr.nodeValue; 375 | } 376 | } 377 | 378 | return undefined; 379 | }; 380 | 381 | 382 | // Wrapper for addEventListener and attachEvent. 383 | CJS.addHandler = function(elem, sType, fn, capture) { 384 | capture = (capture) ? true : false; 385 | if (elem.addEventListener) { 386 | elem.addEventListener(sType, fn, capture); 387 | } 388 | else if (elem.attachEvent) { 389 | elem.attachEvent("on" + sType, fn); 390 | } 391 | else { 392 | // Netscape 4 393 | if ( elem["on" + sType] ) { 394 | // Do nothing - we don't want to overwrite an existing handler. 395 | } 396 | else { 397 | elem["on" + sType] = fn; 398 | } 399 | } 400 | }; 401 | 402 | 403 | // Dynamically define dprint debug logging function. 404 | if ( "undefined" != typeof(console) && "undefined" != typeof(console.log) ) { 405 | CJS.dprint = function(msg) { 406 | console.log("CJS " + Number(new Date()) + ": " + msg); 407 | }; 408 | } 409 | else { 410 | CJS.dprint = function(msg) { }; 411 | /* 412 | var gDprint = ""; 413 | CJS.dprint = function(msg) { 414 | var div = document.getElementById('dprint'); 415 | if ( ! div ) { 416 | if ( ! document.body ) { 417 | gDprint = msg + "
" + gDprint; 418 | return; 419 | } 420 | div = document.createElement('div'); 421 | div.id = "dprint"; 422 | document.body.appendChild(div); 423 | div.style.cssText = "border: 2px solid #999; width: 700px; height: 600px; position: fixed; top: 20px; right: 20px; padding: 8px; background: #FFF; font-size: 10px;"; 424 | div.innerHTML += gDprint; 425 | } 426 | 427 | div.innerHTML = msg + "
" + div.innerHTML; 428 | }; 429 | */ 430 | }; 431 | 432 | 433 | // 434 | // Override document.write 435 | // 436 | 437 | // Attempt to handle document.write. Doesn't work well if the 438 | // document.write occurs in the HEAD or if it outputs a SCRIPT tag. 439 | CJS.docwrite = function(text) { 440 | if ( CJS.curScript ) { 441 | if ( ! CJS.curScript.docwriteTarget ) { 442 | CJS.curScript.docwriteTarget = document.createElement('span'); 443 | CJS.curScript.parentNode.insertBefore(CJS.curScript.docwriteTarget, CJS.curScript); 444 | } 445 | 446 | var i1 = text.indexOf("", i1) + 9; 455 | if ( -1 != i2 ) { 456 | var textBefore = text.substring(0, i1); 457 | var textScript = text.substring(i1, i2); 458 | var textAfter = text.substring(i2+1); 459 | 460 | if ( textBefore ) { 461 | CJS.dprint("docwrite: " + textBefore.substring(0, 64)); 462 | CJS.curScript.docwriteTarget.innerHTML += textBefore + textAfter; 463 | } 464 | 465 | CJS.docwriteScript(textScript); 466 | } 467 | } 468 | } 469 | else { 470 | CJS.dprint("ERROR: There's a problem with the async override of document.write."); 471 | } 472 | }; 473 | 474 | 475 | // Insert a SCRIPT element found during document.write. 476 | CJS.docwriteScript = function(textScript) { 477 | // extract SRC from script docwrite and insert dynamically 478 | var aMatches = textScript.match(/src='([^']*)/i) || 479 | textScript.match(/src="([^"]*)/i) || 480 | textScript.match(/src=([^ >]*)/i); 481 | 482 | if ( aMatches ) { 483 | var url = aMatches[1]; 484 | CJS.dprint("docwriteScript url = " + url); 485 | var se = document.createElement('script'); 486 | se.src = url; 487 | document.body.appendChild(se); 488 | } 489 | else { 490 | // TODO - handle inline SCRIPT code 491 | } 492 | }; 493 | 494 | 495 | 496 | CJS.start(); 497 | --------------------------------------------------------------------------------