How to select a dynamically created element?

Question

JavaScript

There is an element. You need to get its size.
$(".class_name").width() doesn't work

.on is used for event handling, not to catch the event, but just to get the size...

Answer 1

Everything should work .
See errors in the browser console - F12.

Answer 2

yes, console.log($(".class_name").width()) and see the
F12 console - chrome, as mentioned above