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Updated polyfill to fix IE10 issue #3

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Updated polyfill to fix IE10 issue #3

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34 changes: 26 additions & 8 deletions index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -49,11 +49,30 @@ if (typeof WeakMap === 'undefined') {

var registrationsTable = new WeakMap();

// We use setImmediate or postMessage for our future callback.
var setImmediate = window.msSetImmediate;

// Use post message to emulate setImmediate.
if (!setImmediate) {
var setImmediate;

// As much as we would like to use the native implementation, IE
// (all versions) suffers a rather annoying bug where it will drop or defer
// callbacks when heavy DOM operations are being performed concurrently.
//
// For a thorough discussion on this, see:
// http://codeforhire.com/2013/09/21/setimmediate-and-messagechannel-broken-on-internet-explorer-10/
if (/Trident|Edge/.test(navigator.userAgent)) {
// Sadly, this bug also affects postMessage and MessageQueues.
//
// We would like to use the onreadystatechange hack for IE <= 10, but it is
// dangerous in the polyfilled environment due to requiring that the
// observed script element be in the document.
setImmediate = setTimeout;

// If some other browser ever implements it, let's prefer their native
// implementation:
} else if (window.setImmediate) {
setImmediate = window.setImmediate;

// Otherwise, we fall back to postMessage as a means of emulating the next
// task semantics of setImmediate.
} else {
var setImmediateQueue = [];
var sentinel = String(Math.random());
window.addEventListener('message', function(e) {
Expand Down Expand Up @@ -542,7 +561,6 @@ Registration.prototype = {
// Fall through.
case 'DOMNodeInserted':
// http://dom.spec.whatwg.org/#concept-mo-queue-childlist
var target = e.relatedNode;
var changedNode = e.target;
var addedNodes, removedNodes;
if (e.type === 'DOMNodeInserted') {
Expand All @@ -557,13 +575,13 @@ Registration.prototype = {
var nextSibling = changedNode.nextSibling;

// 1.
var record = getRecord('childList', target);
var record = getRecord('childList', e.target.parentNode);
record.addedNodes = addedNodes;
record.removedNodes = removedNodes;
record.previousSibling = previousSibling;
record.nextSibling = nextSibling;

forEachAncestorAndObserverEnqueueRecord(target, function(options) {
forEachAncestorAndObserverEnqueueRecord(e.relatedNode, function(options) {
// 2.1, 3.2
if (!options.childList)
return;
Expand Down