how to get element height in Vue.js

Question

i'm trying to get offsetHeight of element but i got undefined.

with this i get html collection and everything works right:

document.getElementsByClassName("plyr--full-ui");

but if i add .offsetHeight i got undefined.

document.getElementsByClassName("plyr--full-ui").offsetHeight;

what is wrong?

Answer 1

HTMLCollection is array-like object. This will get first element offsetHeight:

document.getElementsByClassName("plyr--full-ui")[0].offsetHeight;