slider drag stops working if index variable passed is not of type int…

[cioddi]

…eger

To avoid this case (and save people running into it a lot of time :)) I propose to just call parseInt on the passed parameter.

example: http://codepen.io/anon/pen/NGjgqR

[cioddi]

I would like to add. Of course this is not a real bug.
But the problem is that it seems to work at first (while it assigns a string value to this.selectedIndex) and then you realize that the drag slide functionality is gone.
So it should either throw some kind of error and do nothing or parse the value to int and just work.

[desandro]

Good call! Added.