Why Does Internet Explorer Sometimes Trigger A Local Storage Event Before The Data's Ready?

Internet Explorer 10 sometimes triggers the window 'storage' event before it has access to the new value. I have a listener for the 'storage' event that reacts to new data being se

Solution 1:

This issue has been raised here: localStorage.getItem returns old data in IE 9

Here's my solution that I've tested in IE10 and expect to work the same in IE8 and IE9:

First, my javascript components don't listen to the window "storage" event directly but instead listen to an 'event dispatcher' I created. The event dispatcher listens to the window "storage" event and triggers a backbone event. What I do is delay my eventDispatcher's storage event trigger for just long enough for IE to catch up. Using Underscore.js's defer() method, I'm able to get consistent behavior across browsers without any impact on user experience.

Here's what my dispatchStorageEvent() method looks like:

$(window).on('storage', dispatchStorageEvent);
functiondispatchStorageEvent(event) {
  _.defer(function() {
    var originalEvent = JSON.parse(event.originalEvent);
    ...
    eventDispatcher.trigger("storageEvent:" + originalEvent.key, originalEvent.newValue);
  }, event);
}