beforeunload event during window close Vs meteor-auto-reload

问题

I use the follow function to detect window close event to perform some cleanup tasks:

    window.addEventListener('beforeunload', function(e) {
          console.log("window close");
          // perform cleanup
    }

Unfortunately I also get this event during meteor auto-reload (for ex. when there is change in code) during which I don't want to perform cleanup.

How do I differentiate between the two situations? (I have a peculiar usecase where I have to differentiate between the two situations)

回答1:

You would have to tap into the Meteor onmigrate api which could help you distuinguish the two:

Client side code:

var hotcodepush = false;

Reload._onMigrate(function () {
    hotcodepush = true;
    return [true];
});


window.addEventListener('beforeunload', function(e) {
      if(!hotcodepush) console.log("window close");
      if(hotcodepush) console.log("Hot code reload");
}

回答2:

Without knowing meteor. I would try to find the point which is executed just before the auto-update (if possible) and define a abort event|variable|... I hope this helps

来源：https://stackoverflow.com/questions/21940888/beforeunload-event-during-window-close-vs-meteor-auto-reload