onKeyUp

The event occurs when a key is released. You can access the event information, using the event parameter.

Further information about key events

console.log(event);
/*
event.type 
event.target 
event.which 
event.altKey 
event.keyCode
event.key 
event.shiftKey 
event.ctrlKey 
*/

//Example

if (event.key == "Enter") {
    app.triggerEvent("onClick", "btnSave");
};