<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Finn vokaler</title>
</head>
<body>
<button onclick="compareLetters('Dette er også en test æøå')">Finn vokaler</button>
<div id="letters">inputString</div>
<div id="vokaler">vokaler</div>
<script>
function compareLetters(inputString) {
let vovels = 0;
var theChar;
document.getElementById('letters').innerHTML = inputString;
var charList = ['a', 'e', 'i', 'u', 'o', 'æ', 'ø', 'å'];
for (let i = 0; i <= inputString.length; i++) {
theChar = inputString.charAt(i);
if (charList.indexOf(theChar) != -1) {
vovels++
}
}
document.getElementById('vokaler').innerHTML = `${vovels}`;
}
</script>
</body>
</html>