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<!DOCTYPE html>
<html>
<head>
<title>Selection Test</title>
</head>
<body>
<select>
<option value="">Empty</option>
<option value="black">Black</option>
<option value="blue">Blue</option>
<option value="brown">Brown</option>
<option value="cyan">Cyan</option>
<option value="gray">Gray</option>
<option value="green">Green</option>
<option value="indigo">Indigo</option>
<option value="magenta">Magenta</option>
<option value="orange">Orange</option>
<option value="pink">Pink</option>
<option value="purple">Purple</option>
<option value="red">Red</option>
<option value="violet">Violet</option>
<option value="white">White</option>
<option value="yellow">Yellow</option>
</select>
<script>
window.result = {
onInput: null,
onChange: null,
onBubblingChange: null,
onBubblingInput: null,
};
let select = document.querySelector('select');
function makeEmpty() {
for (let i = select.options.length - 1; i >= 0; --i) {
select.remove(i);
}
}
function makeMultiple() {
select.setAttribute('multiple', true);
}
select.addEventListener('input', () => {
result.onInput = Array.from(select.querySelectorAll('option:checked')).map((option) => {
return option.value;
});
}, false);
select.addEventListener('change', () => {
result.onChange = Array.from(select.querySelectorAll('option:checked')).map((option) => {
return option.value;
});
}, false);
document.body.addEventListener('input', () => {
result.onBubblingInput = Array.from(select.querySelectorAll('option:checked')).map((option) => {
return option.value;
});
}, false);
document.body.addEventListener('change', () => {
result.onBubblingChange = Array.from(select.querySelectorAll('option:checked')).map((option) => {
return option.value;
});
}, false);
</script>
</body>
</html>