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<!DOCTYPE html>
<body>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
class MyControl extends HTMLElement {
static get formAssociated() { return true; }
constructor() {
super();
this.resetCalled_ = false;
}
formResetCallback() {
this.resetCalled_ = true;
if (this.outputElement_) {
this.outputValueDuringResetCallback_ = this.outputElement_.value;
}
}
get resetCalled() { return this.resetCalled_; }
// This is only used in a single test below; the idea is this: before the form
// gets reset (i.e., before `formResetCallback()` is queued and run by the
// platform), we assign an `HTMLOutputElement` whose value we record *while*
// `formResetCallback()` runs. This lets the test verify that built-in form
// controls are reset *before* custom element `formResetCallback()`s are run
// with custom element reaction timing, at the very end of the form reset
// process.
set outputToObserve(output) {
this.outputElement_ = output;
}
get outputElementValueDuringResetCallback() {
return this.outputValueDuringResetCallback_;
}
}
customElements.define('my-control', MyControl);
test(() => {
document.body.insertAdjacentHTML('beforeend',
'<form><my-control></my-control></form>');
let form = document.body.lastChild;
let custom = form.firstChild;
form.reset();
assert_true(custom.resetCalled);
}, 'form.reset() should trigger formResetCallback');
test(() => {
document.body.insertAdjacentHTML('beforeend',
'<form><my-control></my-control><output>default</output></form>');
let form = document.body.lastChild;
let custom = form.firstChild;
let output = form.lastChild;
output.value = 'updated';
// This is the `HTMLOutputElement` that `custom` will record the `value` of,
// when `custom`'s `formResetCallback()` runs.
custom.outputToObserve = output;
// Reset the form.
assert_false(custom.resetCalled,
"formResetCallback is not called before the form is reset");
form.reset();
assert_true(custom.resetCalled, "formResetCallback is called " +
"synchronously after the form is reset");
assert_equals(custom.outputElementValueDuringResetCallback, "default",
"formResetCallback() runs *after* built-in form control reset " +
"algorithms run, and can observe their effects");
}, 'form.reset(): formResetCallback is called synchronously at the end of ' +
'form reset, with custom element reaction timing, *after* built-in form ' +
'control reset algorithms run.');
promise_test(() => {
document.body.insertAdjacentHTML('beforeend',
'<form><my-control></my-control><input type=reset></form>');
let form = document.body.lastChild;
let custom = form.firstChild;
let resetButton = form.lastChild;
assert_false(custom.resetCalled);
resetButton.click();
assert_false(custom.resetCalled);
return Promise.resolve().then(() => assert_true(custom.resetCalled));
}, 'Clicking a reset button invokes formResetCallback in a microtask');
</script>
</body>
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