When using jQuery on(), why use (document) vs. the element itself?

Question

I\'d like a jQuery expert in their own words to explain why the $(document) identifier is recommended by others for jQuery\'s on() statement vs just using an element itself<

Answer 1

$(*selector*).on(*event*, function(){})

will apply only for elements which is already load in page at the moment of script run. If in future, will appear new elements, the event handler will be not work.

$(document).on(*event*, *selector*, function(){} 

will execute event handler even the elements with same selector will appear on page after script run.

So, if you have some elements, which can appear after in random time, use

$(document).on()

else use

$(*selector*).on();