Accidental quit prevention mechanism

[dragonBTV]

I know we have the opportunity to save data before quitting app:
    import { me } from "appbit";
    me.onunload = () => {}

but it is a one way call with no return.

I had a long term test of my app yesterday and end up with an accidential quit of left button pressing during my sleep (I guess). It is a lap chronograph app with 100 laps data bank and 100 hours total counting time, it should not be quit without a double confirmation from user.

I am thinking of a system event which can prevent this.

[JonFitbit · Accepted solution]

You might be able to listen to events for the BACK button, and stop it exiting the first attempt, but use it wisely. You should always provide users with a way to exit.

Something like:

import document from "document";

document.onkeypress = function(evt) {
  console.log("Key pressed: " + evt.key);
  if (evt.key === "back") {
    evt.preventDefault();
  }
}

[dragonBTV]

Thank you for your prompt reply!

Yes, I do test that before without that key line of 

evt.preventDefault();

and leading to a mass, 

🙂