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'use strict';
test(function() {
let count = 0;
function handler() {
count++;
}
const et = new EventTarget();
const controller = new AbortController();
et.addEventListener('test', handler, { signal: controller.signal });
et.dispatchEvent(new Event('test'));
assert_equals(count, 1, "Adding a signal still adds a listener");
et.dispatchEvent(new Event('test'));
assert_equals(count, 2, "The listener was not added with the once flag");
controller.abort();
et.dispatchEvent(new Event('test'));
assert_equals(count, 2, "Aborting on the controller removes the listener");
et.addEventListener('test', handler, { signal: controller.signal });
et.dispatchEvent(new Event('test'));
assert_equals(count, 2, "Passing an aborted signal never adds the handler");
}, "Passing an AbortSignal to addEventListener options should allow removing a listener");
test(function() {
let count = 0;
function handler() {
count++;
}
const et = new EventTarget();
const controller = new AbortController();
et.addEventListener('test', handler, { signal: controller.signal });
et.removeEventListener('test', handler);
et.dispatchEvent(new Event('test'));
assert_equals(count, 0, "The listener was still removed");
}, "Passing an AbortSignal to addEventListener does not prevent removeEventListener");
test(function() {
let count = 0;
function handler() {
count++;
}
const et = new EventTarget();
const controller = new AbortController();
et.addEventListener('test', handler, { signal: controller.signal, once: true });
controller.abort();
et.dispatchEvent(new Event('test'));
assert_equals(count, 0, "The listener was still removed");
}, "Passing an AbortSignal to addEventListener works with the once flag");
test(function() {
let count = 0;
function handler() {
count++;
}
const et = new EventTarget();
const controller = new AbortController();
et.addEventListener('test', handler, { signal: controller.signal, once: true });
et.removeEventListener('test', handler);
et.dispatchEvent(new Event('test'));
assert_equals(count, 0, "The listener was still removed");
}, "Removing a once listener works with a passed signal");
test(function() {
let count = 0;
function handler() {
count++;
}
const et = new EventTarget();
const controller = new AbortController();
et.addEventListener('first', handler, { signal: controller.signal, once: true });
et.addEventListener('second', handler, { signal: controller.signal, once: true });
controller.abort();
et.dispatchEvent(new Event('first'));
et.dispatchEvent(new Event('second'));
assert_equals(count, 0, "The listener was still removed");
}, "Passing an AbortSignal to multiple listeners");
test(function() {
let count = 0;
function handler() {
count++;
}
const et = new EventTarget();
const controller = new AbortController();
et.addEventListener('test', handler, { signal: controller.signal, capture: true });
controller.abort();
et.dispatchEvent(new Event('test'));
assert_equals(count, 0, "The listener was still removed");
}, "Passing an AbortSignal to addEventListener works with the capture flag");
test(function() {
let count = 0;
function handler() {
count++;
}
const et = new EventTarget();
const controller = new AbortController();
et.addEventListener('test', () => {
controller.abort();
}, { signal: controller.signal });
et.addEventListener('test', handler, { signal: controller.signal });
et.dispatchEvent(new Event('test'));
assert_equals(count, 0, "The listener was still removed");
}, "Aborting from a listener does not call future listeners");
test(function() {
let count = 0;
function handler() {
count++;
}
const et = new EventTarget();
const controller = new AbortController();
et.addEventListener('test', () => {
et.addEventListener('test', handler, { signal: controller.signal });
controller.abort();
}, { signal: controller.signal });
et.dispatchEvent(new Event('test'));
assert_equals(count, 0, "The listener was still removed");
}, "Adding then aborting a listener in another listener does not call it");
test(function() {
const et = new EventTarget();
const ac = new AbortController();
let count = 0;
et.addEventListener('foo', () => {
et.addEventListener('foo', () => {
count++;
if (count > 5) ac.abort();
et.dispatchEvent(new Event('foo'));
}, { signal: ac.signal });
et.dispatchEvent(new Event('foo'));
}, { once: true });
et.dispatchEvent(new Event('foo'));
}, "Aborting from a nested listener should remove it");
test(function() {
const et = new EventTarget();
assert_throws_js(TypeError, () => { et.addEventListener("foo", () => {}, { signal: null }); });
}, "Passing null as the signal should throw");
test(function() {
const et = new EventTarget();
assert_throws_js(TypeError, () => { et.addEventListener("foo", null, { signal: null }); });
}, "Passing null as the signal should throw (listener is also null)");
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