Hi, Does anyone know how to disable the button via JS? And whether JS can catch

When you say disable, what is the use case? How do you expect the user to move out of the form? If your use case is to stop the form from being submitted until some data is completed, you should consider using field validations on the component you need filled in (I would recommend using Appian's out of the box validation capabilities such as REQUIRED).

-if your use case is something else, please elaborate and we can find out the best way to address your queryl