MutationObserver.js
12.3 KB
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
/**
* @license
* Copyright (c) 2014 The Polymer Project Authors. All rights reserved.
* This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
* The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
* The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
* Code distributed by Google as part of the polymer project is also
* subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
*/
// @version 0.7.14
if (typeof WeakMap === "undefined") {
(function() {
var defineProperty = Object.defineProperty;
var counter = Date.now() % 1e9;
var WeakMap = function() {
this.name = "__st" + (Math.random() * 1e9 >>> 0) + (counter++ + "__");
};
WeakMap.prototype = {
set: function(key, value) {
var entry = key[this.name];
if (entry && entry[0] === key) entry[1] = value; else defineProperty(key, this.name, {
value: [ key, value ],
writable: true
});
return this;
},
get: function(key) {
var entry;
return (entry = key[this.name]) && entry[0] === key ? entry[1] : undefined;
},
"delete": function(key) {
var entry = key[this.name];
if (!entry || entry[0] !== key) return false;
entry[0] = entry[1] = undefined;
return true;
},
has: function(key) {
var entry = key[this.name];
if (!entry) return false;
return entry[0] === key;
}
};
window.WeakMap = WeakMap;
})();
}
(function(global) {
var registrationsTable = new WeakMap();
var setImmediate;
if (/Trident|Edge/.test(navigator.userAgent)) {
setImmediate = setTimeout;
} else if (window.setImmediate) {
setImmediate = window.setImmediate;
} else {
var setImmediateQueue = [];
var sentinel = String(Math.random());
window.addEventListener("message", function(e) {
if (e.data === sentinel) {
var queue = setImmediateQueue;
setImmediateQueue = [];
queue.forEach(function(func) {
func();
});
}
});
setImmediate = function(func) {
setImmediateQueue.push(func);
window.postMessage(sentinel, "*");
};
}
var isScheduled = false;
var scheduledObservers = [];
function scheduleCallback(observer) {
scheduledObservers.push(observer);
if (!isScheduled) {
isScheduled = true;
setImmediate(dispatchCallbacks);
}
}
function wrapIfNeeded(node) {
return window.ShadowDOMPolyfill && window.ShadowDOMPolyfill.wrapIfNeeded(node) || node;
}
function dispatchCallbacks() {
isScheduled = false;
var observers = scheduledObservers;
scheduledObservers = [];
observers.sort(function(o1, o2) {
return o1.uid_ - o2.uid_;
});
var anyNonEmpty = false;
observers.forEach(function(observer) {
var queue = observer.takeRecords();
removeTransientObserversFor(observer);
if (queue.length) {
observer.callback_(queue, observer);
anyNonEmpty = true;
}
});
if (anyNonEmpty) dispatchCallbacks();
}
function removeTransientObserversFor(observer) {
observer.nodes_.forEach(function(node) {
var registrations = registrationsTable.get(node);
if (!registrations) return;
registrations.forEach(function(registration) {
if (registration.observer === observer) registration.removeTransientObservers();
});
});
}
function forEachAncestorAndObserverEnqueueRecord(target, callback) {
for (var node = target; node; node = node.parentNode) {
var registrations = registrationsTable.get(node);
if (registrations) {
for (var j = 0; j < registrations.length; j++) {
var registration = registrations[j];
var options = registration.options;
if (node !== target && !options.subtree) continue;
var record = callback(options);
if (record) registration.enqueue(record);
}
}
}
}
var uidCounter = 0;
function JsMutationObserver(callback) {
this.callback_ = callback;
this.nodes_ = [];
this.records_ = [];
this.uid_ = ++uidCounter;
}
JsMutationObserver.prototype = {
observe: function(target, options) {
target = wrapIfNeeded(target);
if (!options.childList && !options.attributes && !options.characterData || options.attributeOldValue && !options.attributes || options.attributeFilter && options.attributeFilter.length && !options.attributes || options.characterDataOldValue && !options.characterData) {
throw new SyntaxError();
}
var registrations = registrationsTable.get(target);
if (!registrations) registrationsTable.set(target, registrations = []);
var registration;
for (var i = 0; i < registrations.length; i++) {
if (registrations[i].observer === this) {
registration = registrations[i];
registration.removeListeners();
registration.options = options;
break;
}
}
if (!registration) {
registration = new Registration(this, target, options);
registrations.push(registration);
this.nodes_.push(target);
}
registration.addListeners();
},
disconnect: function() {
this.nodes_.forEach(function(node) {
var registrations = registrationsTable.get(node);
for (var i = 0; i < registrations.length; i++) {
var registration = registrations[i];
if (registration.observer === this) {
registration.removeListeners();
registrations.splice(i, 1);
break;
}
}
}, this);
this.records_ = [];
},
takeRecords: function() {
var copyOfRecords = this.records_;
this.records_ = [];
return copyOfRecords;
}
};
function MutationRecord(type, target) {
this.type = type;
this.target = target;
this.addedNodes = [];
this.removedNodes = [];
this.previousSibling = null;
this.nextSibling = null;
this.attributeName = null;
this.attributeNamespace = null;
this.oldValue = null;
}
function copyMutationRecord(original) {
var record = new MutationRecord(original.type, original.target);
record.addedNodes = original.addedNodes.slice();
record.removedNodes = original.removedNodes.slice();
record.previousSibling = original.previousSibling;
record.nextSibling = original.nextSibling;
record.attributeName = original.attributeName;
record.attributeNamespace = original.attributeNamespace;
record.oldValue = original.oldValue;
return record;
}
var currentRecord, recordWithOldValue;
function getRecord(type, target) {
return currentRecord = new MutationRecord(type, target);
}
function getRecordWithOldValue(oldValue) {
if (recordWithOldValue) return recordWithOldValue;
recordWithOldValue = copyMutationRecord(currentRecord);
recordWithOldValue.oldValue = oldValue;
return recordWithOldValue;
}
function clearRecords() {
currentRecord = recordWithOldValue = undefined;
}
function recordRepresentsCurrentMutation(record) {
return record === recordWithOldValue || record === currentRecord;
}
function selectRecord(lastRecord, newRecord) {
if (lastRecord === newRecord) return lastRecord;
if (recordWithOldValue && recordRepresentsCurrentMutation(lastRecord)) return recordWithOldValue;
return null;
}
function Registration(observer, target, options) {
this.observer = observer;
this.target = target;
this.options = options;
this.transientObservedNodes = [];
}
Registration.prototype = {
enqueue: function(record) {
var records = this.observer.records_;
var length = records.length;
if (records.length > 0) {
var lastRecord = records[length - 1];
var recordToReplaceLast = selectRecord(lastRecord, record);
if (recordToReplaceLast) {
records[length - 1] = recordToReplaceLast;
return;
}
} else {
scheduleCallback(this.observer);
}
records[length] = record;
},
addListeners: function() {
this.addListeners_(this.target);
},
addListeners_: function(node) {
var options = this.options;
if (options.attributes) node.addEventListener("DOMAttrModified", this, true);
if (options.characterData) node.addEventListener("DOMCharacterDataModified", this, true);
if (options.childList) node.addEventListener("DOMNodeInserted", this, true);
if (options.childList || options.subtree) node.addEventListener("DOMNodeRemoved", this, true);
},
removeListeners: function() {
this.removeListeners_(this.target);
},
removeListeners_: function(node) {
var options = this.options;
if (options.attributes) node.removeEventListener("DOMAttrModified", this, true);
if (options.characterData) node.removeEventListener("DOMCharacterDataModified", this, true);
if (options.childList) node.removeEventListener("DOMNodeInserted", this, true);
if (options.childList || options.subtree) node.removeEventListener("DOMNodeRemoved", this, true);
},
addTransientObserver: function(node) {
if (node === this.target) return;
this.addListeners_(node);
this.transientObservedNodes.push(node);
var registrations = registrationsTable.get(node);
if (!registrations) registrationsTable.set(node, registrations = []);
registrations.push(this);
},
removeTransientObservers: function() {
var transientObservedNodes = this.transientObservedNodes;
this.transientObservedNodes = [];
transientObservedNodes.forEach(function(node) {
this.removeListeners_(node);
var registrations = registrationsTable.get(node);
for (var i = 0; i < registrations.length; i++) {
if (registrations[i] === this) {
registrations.splice(i, 1);
break;
}
}
}, this);
},
handleEvent: function(e) {
e.stopImmediatePropagation();
switch (e.type) {
case "DOMAttrModified":
var name = e.attrName;
var namespace = e.relatedNode.namespaceURI;
var target = e.target;
var record = new getRecord("attributes", target);
record.attributeName = name;
record.attributeNamespace = namespace;
var oldValue = e.attrChange === MutationEvent.ADDITION ? null : e.prevValue;
forEachAncestorAndObserverEnqueueRecord(target, function(options) {
if (!options.attributes) return;
if (options.attributeFilter && options.attributeFilter.length && options.attributeFilter.indexOf(name) === -1 && options.attributeFilter.indexOf(namespace) === -1) {
return;
}
if (options.attributeOldValue) return getRecordWithOldValue(oldValue);
return record;
});
break;
case "DOMCharacterDataModified":
var target = e.target;
var record = getRecord("characterData", target);
var oldValue = e.prevValue;
forEachAncestorAndObserverEnqueueRecord(target, function(options) {
if (!options.characterData) return;
if (options.characterDataOldValue) return getRecordWithOldValue(oldValue);
return record;
});
break;
case "DOMNodeRemoved":
this.addTransientObserver(e.target);
case "DOMNodeInserted":
var changedNode = e.target;
var addedNodes, removedNodes;
if (e.type === "DOMNodeInserted") {
addedNodes = [ changedNode ];
removedNodes = [];
} else {
addedNodes = [];
removedNodes = [ changedNode ];
}
var previousSibling = changedNode.previousSibling;
var nextSibling = changedNode.nextSibling;
var record = getRecord("childList", e.target.parentNode);
record.addedNodes = addedNodes;
record.removedNodes = removedNodes;
record.previousSibling = previousSibling;
record.nextSibling = nextSibling;
forEachAncestorAndObserverEnqueueRecord(e.relatedNode, function(options) {
if (!options.childList) return;
return record;
});
}
clearRecords();
}
};
global.JsMutationObserver = JsMutationObserver;
if (!global.MutationObserver) global.MutationObserver = JsMutationObserver;
})(self);