How to make a question before form exit

Rails
#1

Hello,
I’m makeing a rails aplication where I need to make a qustion to my
users like ‘Do you want to save changes?’ if the user exit of the form
without save changes. If this possbile?

#2

Jose wrote:

I’m makeing a rails aplication where I need to make a qustion to my
users like ‘Do you want to save changes?’ if the user exit of the form
without save changes. If this possbile?

Google onunload.

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