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Counting checked checkboxes in realtime without submiting or any other action in html5

I´m doing a management page for a learning institute as a homework of programming languages subject, and I need to make an assistance database and its frontend.
I made a table with students IDs, names and a column with checkboxes that you checked if that student is present.
I want to count the number of present students, let´s say, on-the-fly. I have found a lot of examples that counts checkboxes when you clicked a buttom or something like that like this ->Count checkboxes…, but I need another thing.
I want to show that number as I checked boxes in “realtime” without clicking another thing, in a text below like ‘Total students Present: “n”‘, and n changes as you check each box.
I will be very greatful with any sugestion or tip.

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