Error with document.getElementById() in js

Question

i get alwas error when i Use
document.getElementById().onclick=function
js does not understand (onclick)
anybody know why?

Answer 1

You can add event Listener to element like this.

https://code.sololearn.com/WT99P8CJ364K

Answer 2

Ummmmm You mean
error with undefined value?

Or the problem like as @Daryl Ferror Legion said?