Multiple date picker is not selecting multiple dates in one time

Question

I have put multiple date picker on my site. It's picking multiple dates but not pick dates in one time. I mean after pick one date I have to do re-focus on input field than i can pick second date. This process I have do for pick each date.

HTML:

<input type="text" id="form-input"/>

Js codes:

$('#from-input').multiDatesPicker();