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<!DOCTYPE html>
<html lang="en">
<title>HTMLselectElement Test: validity</title>
<link rel="author" title="Ionel Popescu" href="mailto:iopopesc@microsoft.com">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<select id="select1" required>
<option>one</option>
<option>two</option>
<option>three</option>
<option>four</option>
</select>
<form>
<select id="select2" required>
</select>
</form>
<style>
select, ::picker(select) {
appearance: base-select;
}
</style>
<script>
test(() => {
let select = document.createElement('select');
assert_true(select.willValidate, "A select element is a submittable element that is a candidate for constraint validation.");
let option = document.createElement('option');
select.appendChild(option);
assert_true(select.checkValidity(), "Always valid when the select isn't a required value.");
select.required = true;
assert_equals(select.value, "");
assert_false(select.checkValidity(), "A selected placeholder option should invalidate the select.");
let emptyOption = document.createElement('option');
select.appendChild(emptyOption);
assert_false(select.checkValidity(), "A selected placeholder option should invalidate the select even if there are multiple options.");
emptyOption.selected = true;
assert_true(select.checkValidity(), "An empty non-placeholder option should be a valid choice.");
let filledOption = document.createElement('option');
filledOption.value = "test";
select.appendChild(filledOption);
filledOption.selected = true;
assert_equals(select.value, "test", "The non-empty value should be set.");
assert_true(select.checkValidity(), "A non-empty non-placeholder option should be a valid choice.");
select.removeChild(option);
select.appendChild(emptyOption);
emptyOption.selected = true;
assert_equals(select.value, "", "The empty value should be set.");
assert_true(select.checkValidity(), "Only the first option can be seen as a placeholder.");
select.removeChild(filledOption);
assert_false(select.checkValidity(), "A selected placeholder option should invalidate the select.");
emptyOption.value = "test2";
assert_equals(select.value, "test2");
assert_true(select.checkValidity(), "A non-empty option value should be a valid choice.");
emptyOption.removeAttribute("value");
assert_equals(select.value, "");
assert_false(select.checkValidity());
emptyOption.innerText = "test";
assert_equals(select.value, "test");
assert_true(select.checkValidity(), "A non-empty option should be a valid choice.");
const select1 = document.getElementById('select1');
assert_equals(select1.value, "one");
assert_true(select1.checkValidity(), "A select with non-empty placeholder option should be valid.");
}, "Validation for placeholder option");
test(() => {
const select2 = document.getElementById('select2');
assert_equals(select2.value, "");
assert_false(select2.checkValidity());
let form = document.querySelector('form');
let invalidControl = form.querySelector('select:invalid');
assert_equals(select2, invalidControl);
let didDispatchInvalid = false;
invalidControl.addEventListener('invalid', e => { didDispatchInvalid = true; });
let didDispatchSubmit = false;
form.addEventListener('submit', event => { event.preventDefault(); didDispatchSubmit = true; });
form.requestSubmit();
assert_true(didDispatchInvalid);
assert_false(didDispatchSubmit);
}, "Check form not submitted for invalid select");
</script>
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