When running a Genero application through Genero Desktop Client, the GDC is a process running on the front-end operating system and has to respect the rules of that operating system. When running a Genero application through Genero Browser Client, we are similarly bound by the rules that browsers apply. A place where you will encounter these rules is what happens when you attempt to close a browser tab by clicking the close button in the browser tab (or File->Close Tab).
Whenever I attempt to explain browser rules, I like to ask the question …
"What would a malicious website developer do if they could break the rule you are asking me to break ?"
… so whenever someone asks “I want to prevent the user closing a browser tab unless …”, I’ll say “what would a malicious website developer do if they were able to write code that meant you were unable to close a browser tab?”
What happens when user closes a browser tab? Why do sometimes you get a warning dialog, and sometimes you don’t? What can we do when the program exits?
Read more at
https://4js.com/ask-reuben/ig-74/
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