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Implement beforefilter event #59029

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Merged
chromium-wpt-export-bot merged 1 commit into from
Apr 8, 2026
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Merged

Implement beforefilter event #59029

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57 changes: 57 additions & 0 deletions html/semantics/forms/customizable-combobox/customizable-combobox-beforefilter.tentative.html
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Original file line number Diff line number Diff line change
@@ -0,0 +1,57 @@
<!DOCTYPE html>
<link rel=author href="mailto:jarhar@chromium.org">
<link rel=help href="https://open-ui.org/components/combobox.explainer">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<input list=datalist>
<datalist id=datalist>
<option class=one>one</option>
<option class=two>two</option>
<option class=three>three</option>
</datalist>

<style>
input, datalist {
appearance: base;
}
</style>

<script>
function visibleOptions() {
return Array.from(document.querySelectorAll('option:not(:filtered)'));
}

promise_test(async () => {
const input = document.querySelector('input');
const datalist = document.querySelector('datalist');
const optionOne = document.querySelector('.one');
const optionTwo = document.querySelector('.two');
const optionThree = document.querySelector('.three');

input.focus();
assert_true(datalist.matches(':popover-open'),
'Datalist should open after focusing the input.');
assert_array_equals(visibleOptions(), [optionOne, optionTwo, optionThree],
'No options should be filtered out at the start of the test.');

input.value = 'z';
assert_array_equals(visibleOptions(), [],
'All options should be filtered out after setting value to z.');

input.value = 't';
assert_array_equals(visibleOptions(), [optionTwo, optionThree],
'Options two and three should be visible after setting value to t.');

let beforefilters = 0;
input.onbeforefilter = event => {
beforefilters++;
event.preventDefault();
};
input.value = 'z';
assert_equals(beforefilters, 1,
'The beforefilter event should fire when assigning to input.value.');
assert_array_equals(visibleOptions(), [optionTwo, optionThree],
'Filtering should not change after preventing beforefilter event.');
}, 'beforefilter event for customizable combobox.');
</script>
54 changes: 54 additions & 0 deletions html/semantics/forms/the-select-element/filterable-select/select-beforefilter.tentative.html
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Original file line number Diff line number Diff line change
@@ -0,0 +1,54 @@
<!DOCTYPE html>
<link rel=author href="mailto:jarhar@chromium.org">
<link rel=help href="https://open-ui.org/components/combobox.explainer">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<input filter=select>
<select id=select size=4>
<option class=one>one</option>
<option class=two>two</option>
<option class=three>three</option>
</select>

<style>
input, select {
appearance: base;
}
</style>

<script>
function visibleOptions() {
return Array.from(document.querySelectorAll('option:not(:filtered)'));
}

promise_test(async () => {
const input = document.querySelector('input');
const select = document.querySelector('select');
const optionOne = document.querySelector('.one');
const optionTwo = document.querySelector('.two');
const optionThree = document.querySelector('.three');

assert_array_equals(visibleOptions(), [optionOne, optionTwo, optionThree],
'No options should be filtered out at the start of the test.');

input.value = 'z';
assert_array_equals(visibleOptions(), [],
'All options should be filtered out after setting value to z.');

input.value = 't';
assert_array_equals(visibleOptions(), [optionTwo, optionThree],
'Options two and three should be visible after setting value to t.');

let beforefilters = 0;
input.onbeforefilter = event => {
beforefilters++;
event.preventDefault();
};
input.value = 'z';
assert_equals(beforefilters, 1,
'The beforefilter event should fire when assigning to input.value.');
assert_array_equals(visibleOptions(), [optionTwo, optionThree],
'Filtering should not change after preventing beforefilter event.');
}, 'beforefilter event for customizable combobox.');
</script>
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