-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathhead.load.js
707 lines (583 loc) · 22.5 KB
/
head.load.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
///#source 1 1 /src/1.0.0/load.js
/*! head.load - v1.0.3 */
/*
* HeadJS The only script in your <HEAD>
* Author Tero Piirainen (tipiirai)
* Maintainer Robert Hoffmann (itechnology)
* License MIT / http://bit.ly/mit-license
* WebSite http://headjs.com
*/
(function (win, undefined) {
"use strict";
//#region variables
var doc = win.document,
domWaiters = [],
handlers = {}, // user functions waiting for events
assets = {}, // loadable items in various states
isAsync = "async" in doc.createElement("script") || "MozAppearance" in doc.documentElement.style || win.opera,
isDomReady,
/*** public API ***/
headVar = win.head_conf && win.head_conf.head || "head",
api = win[headVar] = (win[headVar] || function () { api.ready.apply(null, arguments); }),
// states
PRELOADING = 1,
PRELOADED = 2,
LOADING = 3,
LOADED = 4;
//#endregion
//#region PRIVATE functions
//#region Helper functions
function noop() {
// does nothing
}
function each(arr, callback) {
if (!arr) {
return;
}
// arguments special type
if (typeof arr === "object") {
arr = [].slice.call(arr);
}
// do the job
for (var i = 0, l = arr.length; i < l; i++) {
callback.call(arr, arr[i], i);
}
}
/* A must read: http://bonsaiden.github.com/JavaScript-Garden
************************************************************/
function is(type, obj) {
var clas = Object.prototype.toString.call(obj).slice(8, -1);
return obj !== undefined && obj !== null && clas === type;
}
function isFunction(item) {
return is("Function", item);
}
function isArray(item) {
return is("Array", item);
}
function toLabel(url) {
///<summary>Converts a url to a file label</summary>
var items = url.split("/"),
name = items[items.length - 1],
i = name.indexOf("?");
return i !== -1 ? name.substring(0, i) : name;
}
// INFO: this look like a "im triggering callbacks all over the place, but only wanna run it one time function" ..should try to make everything work without it if possible
// INFO: Even better. Look into promises/defered's like jQuery is doing
function one(callback) {
///<summary>Execute a callback only once</summary>
callback = callback || noop;
if (callback._done) {
return;
}
callback();
callback._done = 1;
}
//#endregion
function conditional(test, success, failure, callback) {
///<summary>
/// INFO: use cases:
/// head.test(condition, null , "file.NOk" , callback);
/// head.test(condition, "fileOk.js", null , callback);
/// head.test(condition, "fileOk.js", "file.NOk" , callback);
/// head.test(condition, "fileOk.js", ["file.NOk", "file.NOk"], callback);
/// head.test({
/// test : condition,
/// success : [{ label1: "file1Ok.js" }, { label2: "file2Ok.js" }],
/// failure : [{ label1: "file1NOk.js" }, { label2: "file2NOk.js" }],
/// callback: callback
/// );
/// head.test({
/// test : condition,
/// success : ["file1Ok.js" , "file2Ok.js"],
/// failure : ["file1NOk.js", "file2NOk.js"],
/// callback: callback
/// );
///</summary>
var obj = (typeof test === "object") ? test : {
test: test,
success: !!success ? isArray(success) ? success : [success] : false,
failure: !!failure ? isArray(failure) ? failure : [failure] : false,
callback: callback || noop
};
// Test Passed ?
var passed = !!obj.test;
// Do we have a success case
if (passed && !!obj.success) {
obj.success.push(obj.callback);
api.load.apply(null, obj.success);
}
// Do we have a fail case
else if (!passed && !!obj.failure) {
obj.failure.push(obj.callback);
api.load.apply(null, obj.failure);
}
else {
callback();
}
return api;
}
function getAsset(item) {
///<summary>
/// Assets are in the form of
/// {
/// name : label,
/// url : url,
/// state: state
/// }
///</summary>
var asset = {};
if (typeof item === "object") {
for (var label in item) {
if (!!item[label]) {
asset = {
name: label,
url : item[label]
};
}
}
}
else {
asset = {
name: toLabel(item),
url : item
};
}
// is the item already existant
var existing = assets[asset.name];
if (existing && existing.url === asset.url) {
return existing;
}
assets[asset.name] = asset;
return asset;
}
function allLoaded(items) {
items = items || assets;
for (var name in items) {
if (items.hasOwnProperty(name) && items[name].state !== LOADED) {
return false;
}
}
return true;
}
function onPreload(asset) {
asset.state = PRELOADED;
each(asset.onpreload, function (afterPreload) {
afterPreload.call();
});
}
function preLoad(asset, callback) {
if (asset.state === undefined) {
asset.state = PRELOADING;
asset.onpreload = [];
loadAsset({ url: asset.url, type: "cache" }, function () {
onPreload(asset);
});
}
}
function apiLoadHack() {
/// <summary>preload with text/cache hack
///
/// head.load("http://domain.com/file.js","http://domain.com/file.js", callBack)
/// head.load(["http://domain.com/file.js","http://domain.com/file.js"], callBack)
/// head.load({ label1: "http://domain.com/file.js" }, { label2: "http://domain.com/file.js" }, callBack)
/// head.load([{ label1: "http://domain.com/file.js" }, { label2: "http://domain.com/file.js" }], callBack)
/// </summary>
var args = arguments,
callback = args[args.length - 1],
rest = [].slice.call(args, 1),
next = rest[0];
if (!isFunction(callback)) {
callback = null;
}
// if array, repush as args
if (isArray(args[0])) {
args[0].push(callback);
api.load.apply(null, args[0]);
return api;
}
// multiple arguments
if (!!next) {
/* Preload with text/cache hack (not good!)
* http://blog.getify.com/on-script-loaders/
* http://www.nczonline.net/blog/2010/12/21/thoughts-on-script-loaders/
* If caching is not configured correctly on the server, then items could load twice !
*************************************************************************************/
each(rest, function (item) {
// item is not a callback or empty string
if (!isFunction(item) && !!item) {
preLoad(getAsset(item));
}
});
// execute
load(getAsset(args[0]), isFunction(next) ? next : function () {
api.load.apply(null, rest);
});
}
else {
// single item
load(getAsset(args[0]));
}
return api;
}
function apiLoadAsync() {
///<summary>
/// simply load and let browser take care of ordering
///
/// head.load("http://domain.com/file.js","http://domain.com/file.js", callBack)
/// head.load(["http://domain.com/file.js","http://domain.com/file.js"], callBack)
/// head.load({ label1: "http://domain.com/file.js" }, { label2: "http://domain.com/file.js" }, callBack)
/// head.load([{ label1: "http://domain.com/file.js" }, { label2: "http://domain.com/file.js" }], callBack)
///</summary>
var args = arguments,
callback = args[args.length - 1],
items = {};
if (!isFunction(callback)) {
callback = null;
}
// if array, repush as args
if (isArray(args[0])) {
args[0].push(callback);
api.load.apply(null, args[0]);
return api;
}
// JRH 262#issuecomment-26288601
// First populate the items array.
// When allLoaded is called, all items will be populated.
// Issue when lazy loaded, the callback can execute early.
each(args, function (item, i) {
if (item !== callback) {
item = getAsset(item);
items[item.name] = item;
}
});
each(args, function (item, i) {
if (item !== callback) {
item = getAsset(item);
load(item, function () {
if (allLoaded(items)) {
one(callback);
}
});
}
});
return api;
}
function load(asset, callback) {
///<summary>Used with normal loading logic</summary>
callback = callback || noop;
if (asset.state === LOADED) {
callback();
return;
}
// INFO: why would we trigger a ready event when its not really loaded yet ?
if (asset.state === LOADING) {
api.ready(asset.name, callback);
return;
}
if (asset.state === PRELOADING) {
asset.onpreload.push(function () {
load(asset, callback);
});
return;
}
asset.state = LOADING;
loadAsset(asset, function () {
asset.state = LOADED;
callback();
// handlers for this asset
each(handlers[asset.name], function (fn) {
one(fn);
});
// dom is ready & no assets are queued for loading
// INFO: shouldn't we be doing the same test above ?
if (isDomReady && allLoaded()) {
each(handlers.ALL, function (fn) {
one(fn);
});
}
});
}
function getExtension(url) {
url = url || "";
var items = url.split("?")[0].split(".");
return items[items.length-1].toLowerCase();
}
/* Parts inspired from: https://github.com/cujojs/curl
******************************************************/
function loadAsset(asset, callback) {
callback = callback || noop;
function error(event) {
event = event || win.event;
// release event listeners
ele.onload = ele.onreadystatechange = ele.onerror = null;
// do callback
callback();
// need some more detailed error handling here
}
function process(event) {
event = event || win.event;
// IE 7/8 (2 events on 1st load)
// 1) event.type = readystatechange, s.readyState = loading
// 2) event.type = readystatechange, s.readyState = loaded
// IE 7/8 (1 event on reload)
// 1) event.type = readystatechange, s.readyState = complete
// event.type === 'readystatechange' && /loaded|complete/.test(s.readyState)
// IE 9 (3 events on 1st load)
// 1) event.type = readystatechange, s.readyState = loading
// 2) event.type = readystatechange, s.readyState = loaded
// 3) event.type = load , s.readyState = loaded
// IE 9 (2 events on reload)
// 1) event.type = readystatechange, s.readyState = complete
// 2) event.type = load , s.readyState = complete
// event.type === 'load' && /loaded|complete/.test(s.readyState)
// event.type === 'readystatechange' && /loaded|complete/.test(s.readyState)
// IE 10 (3 events on 1st load)
// 1) event.type = readystatechange, s.readyState = loading
// 2) event.type = load , s.readyState = complete
// 3) event.type = readystatechange, s.readyState = loaded
// IE 10 (3 events on reload)
// 1) event.type = readystatechange, s.readyState = loaded
// 2) event.type = load , s.readyState = complete
// 3) event.type = readystatechange, s.readyState = complete
// event.type === 'load' && /loaded|complete/.test(s.readyState)
// event.type === 'readystatechange' && /complete/.test(s.readyState)
// Other Browsers (1 event on 1st load)
// 1) event.type = load, s.readyState = undefined
// Other Browsers (1 event on reload)
// 1) event.type = load, s.readyState = undefined
// event.type == 'load' && s.readyState = undefined
// !doc.documentMode is for IE6/7, IE8+ have documentMode
if (event.type === "load" || (/loaded|complete/.test(ele.readyState) && (!doc.documentMode || doc.documentMode < 9))) {
// remove timeouts
win.clearTimeout(asset.errorTimeout);
win.clearTimeout(asset.cssTimeout);
// release event listeners
ele.onload = ele.onreadystatechange = ele.onerror = null;
// do callback
callback();
}
}
function isCssLoaded() {
// should we test again ? 20 retries = 5secs ..after that, the callback will be triggered by the error handler at 7secs
if (asset.state !== LOADED && asset.cssRetries <= 20) {
// loop through stylesheets
for (var i = 0, l = doc.styleSheets.length; i < l; i++) {
// do we have a match ?
// we need to tests agains ele.href and not asset.url, because a local file will be assigned the full http path on a link element
if (doc.styleSheets[i].href === ele.href) {
process({ "type": "load" });
return;
}
}
// increment & try again
asset.cssRetries++;
asset.cssTimeout = win.setTimeout(isCssLoaded, 250);
}
}
var ele;
var ext = getExtension(asset.url);
if (ext === "css") {
ele = doc.createElement("link");
ele.type = "text/" + (asset.type || "css");
ele.rel = "stylesheet";
ele.href = asset.url;
/* onload supported for CSS on unsupported browsers
* Safari windows 5.1.7, FF < 10
*/
// Set counter to zero
asset.cssRetries = 0;
asset.cssTimeout = win.setTimeout(isCssLoaded, 500);
}
else {
ele = doc.createElement("script");
ele.type = "text/" + (asset.type || "javascript");
ele.src = asset.url;
}
ele.onload = ele.onreadystatechange = process;
ele.onerror = error;
/* Good read, but doesn't give much hope !
* http://blog.getify.com/on-script-loaders/
* http://www.nczonline.net/blog/2010/12/21/thoughts-on-script-loaders/
* https://hacks.mozilla.org/2009/06/defer/
*/
// ASYNC: load in parallel and execute as soon as possible
ele.async = false;
// DEFER: load in parallel but maintain execution order
ele.defer = false;
// timout for asset loading
asset.errorTimeout = win.setTimeout(function () {
error({ type: "timeout" });
}, 7e3);
// use insertBefore to keep IE from throwing Operation Aborted (thx Bryan Forbes!)
var head = doc.head || doc.getElementsByTagName("head")[0];
// but insert at end of head, because otherwise if it is a stylesheet, it will not override values
head.insertBefore(ele, head.lastChild);
}
/* Parts inspired from: https://github.com/jrburke/requirejs
************************************************************/
function init() {
var items = doc.getElementsByTagName("script");
// look for a script with a data-head-init attribute
for (var i = 0, l = items.length; i < l; i++) {
var dataMain = items[i].getAttribute("data-headjs-load");
if (!!dataMain) {
api.load(dataMain);
return;
}
}
}
function ready(key, callback) {
///<summary>
/// INFO: use cases:
/// head.ready(callBack);
/// head.ready(document , callBack);
/// head.ready("file.js", callBack);
/// head.ready("label" , callBack);
/// head.ready(["label1", "label2"], callback);
///</summary>
// DOM ready check: head.ready(document, function() { });
if (key === doc) {
if (isDomReady) {
one(callback);
}
else {
domWaiters.push(callback);
}
return api;
}
// shift arguments
if (isFunction(key)) {
callback = key;
key = "ALL"; // holds all callbacks that where added without labels: ready(callBack)
}
// queue all items from key and return. The callback will be executed if all items from key are already loaded.
if (isArray(key)) {
var items = {};
each(key, function (item) {
items[item] = assets[item];
api.ready(item, function() {
if (allLoaded(items)) {
one(callback);
}
});
});
return api;
}
// make sure arguments are sane
if (typeof key !== "string" || !isFunction(callback)) {
return api;
}
// this can also be called when we trigger events based on filenames & labels
var asset = assets[key];
// item already loaded --> execute and return
if (asset && asset.state === LOADED || key === "ALL" && allLoaded() && isDomReady) {
one(callback);
return api;
}
var arr = handlers[key];
if (!arr) {
arr = handlers[key] = [callback];
}
else {
arr.push(callback);
}
return api;
}
/* Mix of stuff from jQuery & IEContentLoaded
* http://dev.w3.org/html5/spec/the-end.html#the-end
***************************************************/
function domReady() {
// Make sure body exists, at least, in case IE gets a little overzealous (jQuery ticket #5443).
if (!doc.body) {
// let's not get nasty by setting a timeout too small.. (loop mania guaranteed if assets are queued)
win.clearTimeout(api.readyTimeout);
api.readyTimeout = win.setTimeout(domReady, 50);
return;
}
if (!isDomReady) {
isDomReady = true;
init();
each(domWaiters, function (fn) {
one(fn);
});
}
}
function domContentLoaded() {
// W3C
if (doc.addEventListener) {
doc.removeEventListener("DOMContentLoaded", domContentLoaded, false);
domReady();
}
// IE
else if (doc.readyState === "complete") {
// we're here because readyState === "complete" in oldIE
// which is good enough for us to call the dom ready!
doc.detachEvent("onreadystatechange", domContentLoaded);
domReady();
}
}
// Catch cases where ready() is called after the browser event has already occurred.
// we once tried to use readyState "interactive" here, but it caused issues like the one
// discovered by ChrisS here: http://bugs.jquery.com/ticket/12282#comment:15
if (doc.readyState === "complete") {
domReady();
}
// W3C
else if (doc.addEventListener) {
doc.addEventListener("DOMContentLoaded", domContentLoaded, false);
// A fallback to window.onload, that will always work
win.addEventListener("load", domReady, false);
}
// IE
else {
// Ensure firing before onload, maybe late but safe also for iframes
doc.attachEvent("onreadystatechange", domContentLoaded);
// A fallback to window.onload, that will always work
win.attachEvent("onload", domReady);
// If IE and not a frame
// continually check to see if the document is ready
var top = false;
try {
top = !win.frameElement && doc.documentElement;
} catch (e) { }
if (top && top.doScroll) {
(function doScrollCheck() {
if (!isDomReady) {
try {
// Use the trick by Diego Perini
// http://javascript.nwbox.com/IEContentLoaded/
top.doScroll("left");
} catch (error) {
// let's not get nasty by setting a timeout too small.. (loop mania guaranteed if assets are queued)
win.clearTimeout(api.readyTimeout);
api.readyTimeout = win.setTimeout(doScrollCheck, 50);
return;
}
// and execute any waiting functions
domReady();
}
}());
}
}
//#endregion
//#region Public Exports
// INFO: determine which method to use for loading
api.load = api.js = isAsync ? apiLoadAsync : apiLoadHack;
api.test = conditional;
api.ready = ready;
//#endregion
//#region INIT
// perform this when DOM is ready
api.ready(doc, function () {
if (allLoaded()) {
each(handlers.ALL, function (callback) {
one(callback);
});
}
if (api.feature) {
api.feature("domloaded", true);
}
});
//#endregion
}(window));