Zoom need click

[FloLech]

I run an embeded a-frame scene using orbit controls. I am facing an interaction issue reagrding zoom:
Once the scene is loaded a user has to click on the scene to make zoom (mouse weel) work. I would like to get the zoom function without the initial click.
I tried to programmatically dispatch a click event – no luck with this approach. For comparison I attached the wsad-controls component. This one recognizes the key inputs without the initial click event.

Any idea on how to make this work?