Mobile keyboard doesn't appear for password input field

[dmalan]

I also found this information, which might be very useful in your situation. It has to do with the "Viewport Bound" option for a popup.

[Bug-13304]Dragging popup prevents text area input on tablet

I’m happy to announce that starting tomorrow the 8.1.3 nightly builds will feature functionality that should resolve this issue. system.perspective.openPopup and togglePopup will now have an optional viewportBound keyword argument which is used for two things: A Popup with this property set to True will be shifted to open in the bounds of the viewport, even if relatively positioned in a manner which would have opened partially off-screen. If the Popup also happens to be too big to open fully …

More information on the Action Setting can be found here:
https://docs.inductiveautomation.com/display/DOC81/Component+Events+and+Actions#ComponentEventsandActions-PopupAction