Question

I am catching the “close” event for tab, but how I can which tab was closed?

safari.application.addEventListener("close", function(e){
     // all e.target values are undefined, which is not helpful..    
},true)

Do you have any idea?

Answer 1

At the moment the event is captured, the properties of e.target (the closed tab) are not undefined. I’m guessing you’re using something like console.log(e.target) and then examining the logged object in the console. You’re seeing undefined properties then because the event has already finished propagating.

Try this instead:

safari.application.addEventListener("close", function (e) {
    if (e.target instanceof SafariBrowserTab) {
        console.log(e.target.title, e.target.url);
    }
}, true);

You will see that the tab’s properties are still defined at the moment of event capture, so you can compare them to previously stored values; or, if you have previously assigned the desired tab to a variable, you can even compare e.target itself to that variable.