Why doesn't this work?

Question

It says 'Can not read property value of null'.
https://code.sololearn.com/W2CGn0yTNnC7/?ref=app

Answer 1

It is happening because js is loading first after that html. Change with this. It will work fine.

function removeSpaces() {
var s = document.getElementById("input");
var sv = s.value;
var l = sv.length;
var r = document.getElementById("result");

var p;

for (var i = 0; i <= l; i++) {
p = sv.replace(" ", "");
}

r.value = p;
}

Answer 2

Nevermind

Answer 3

Can you put it into a code?