I’ve created a button, added an onClick event, added a Script action. The action body is just system.gui.messageBox(“foo”). In my client, clicking the button does nothing. I’ve also tried with onChange and onMouseDown. I’ve also tried just having the script add 1 to a numeric field.
Ignition 8.0.0-beta0 (b2018120302), Chrome and also iOS 11.3/iPhone 7.