An error occurs TypeError: null is not an object?

Question

JavaScript

Hello, this error occurs.



I'm trying to take a value from the dropdown lista and assign value to the e variable, I output it to the log and everything is fine, but when I need to display it on the order page, the whole block is not displayed, but it's surprising that if I just assign any e variable a numerical value (for example 2) then everything is displayed normally, although the error in the console does not disappear. I can not understand what the trouble is. I tried to convert this variable to a number, nothing happens. here is the code

https://codepen.io/markivv/pen/dyOJQZV



I will be grateful for your help

Answer 1

The error says that the page, at the time of execution, could not find the element.cart-nav