after some test I noticed this only happens when Pikaday is configured inside of a $() function.
So I put the initialization code to just before </body> and works well. The only thing that bothers me is the code have to be in the html file and not in a separate JS file.

Great, thanks.

Is there a way to get around this without having to put the code in the HTML? I'm using Pikaday as part of an Ember component so putting the initializer into the HTML isn't really an option. Are there are pika-specific events I can watch for?

Any solution to this?

I was able to fix this without putting the initialization in the HTML by editing the pikaday.js file on line 730 where there's a fireEvent call...I wrapped it with an if statement checking to see if 'preventOnSelect' was true because the initialization case was the only one I could find where true was sent in rather than null/false. Code (with a few surrounding lines for clarity) looks like this:

728:  if(this._o.field) {
729:      this._o.field.value = this.toString();
730:      if (!preventOnSelect) {
731:            fireEvent(this._o.field, 'change', { firedBy: this });
732:      }
733:  }

Can you please reopen the issue and fix this?

I actually have a case where this behavior causes a stackoverflow as it will call the onchange event over and over again.
This is not really working with vdom libs (mithril in my case), I guess.

I don't see why the onchange event should be emitted when nothing actually changed.

Thanks a ton!

I had the same issue, and found that even the most recent version of Pikaday fires the change event on page load if the form field that is configured as a Pikaday field has a pre-populated date from previous user-input.

I found that by modifying pikaday.js on lines 852-854 (of the current committed file as of writing), to include an old/new value comparison around the fireEvent() call, that the change event now only fires when the data actually has changed.

Feel free to merge the changes referenced in the above forked commit to resolve #149.