CODEWITHSUNDEEP
javascriptfirefoxtabsgreasemonkey
pzsolt
pzsolt

Reputation: 49

How to run script in Firefox when a tab was closed?

At our company we are using a web application with shared licenses. Unfortunately if someone simply closes the tab the application is running in it wont release the license lock. I am wondering whether it is possible to run/trigger a scipt when a Firefox tab is closed, so I could automatically release the licenses? I think greasemonkey might be able to do this, but I haven't found a solution yet.

Upvotes: 0

Views: 597

Answers (2)

Kuba Wyrostek
Kuba Wyrostek

Reputation: 6221

You can try to release locks in unload events, as Bcfm suggested in his answer, but what if browser or computer simply crashes? Or script takes too long to execute and gets killed by browser anyway?

Another approach would be to make the site constantly ping license server (i.e. every 10 seconds) so that lock is hold until there is no ping for proportional amount of time (i.e. 30 seconds). This way the license lock is freed in all cases.

Of course this may be not relevant to your scenario, it's just a suggestion.

Upvotes: 0

Bfcm
Bfcm

Reputation: 2746

There is both window.onbeforeunload and window.onunload, which are used differently depending on the browser. You can assing them either by setting the window properties to functions, or using the .addEventListener:

window.onbeforeunload = function(){
   // Do something
}
// OR
window.addEventListener("beforeunload", function(e){
   // Do something
}, false);

Usually, onbeforeunload is used if you need to stop the user from leaving the page (ex. the user is working on some unsaved data, so he/she should save before leaving).

Upvotes: 2

Related Questions