How do I strecth the viewport of game?

Hello

I create game with aspect ratio 16:9. But it become issue when I try play the game in mobile phone where they have various aspect ratio depend on the model. So, my game will have black edges because can't be strecthed dynamically.

How do I automatically strecth the viewport to fit mobilephone screen size?

Thank you.

Use Scale Outer mode:

construct.net/en/tutorials/supporting-multiple-screen-17

Seems I need place background more wider than viewport to cover the screen area.

I think it's better to dynamically resize the viewport following the screen size.

Can it be done with java script?

Scale Outer or Scale Inner modes will dynamically resize the viewport to screen size. But it's your job to make sure that the game properly fills the viewport - that the backgrounds are stretched, that the UI is correctly positioned etc.