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<!DOCTYPE html>
<meta charset=utf-8>
<title>EventListener::handleEvent()</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<link rel="help" href="https://dom.spec.whatwg.org/#callbackdef-eventlistener">
<div id=log></div>
<script>
setup({ allow_uncaught_exception: true });
test(function(t) {
var type = "foo";
var target = document.createElement("div");
var eventListener = {
handleEvent: function(evt) {
var that = this;
t.step(function() {
assert_equals(evt.type, type);
assert_equals(evt.target, target);
assert_equals(evt.srcElement, target);
assert_equals(that, eventListener);
});
},
};
target.addEventListener(type, eventListener);
target.dispatchEvent(new Event(type));
}, "calls `handleEvent` method of `EventListener`");
test(function(t) {
var type = "foo";
var target = document.createElement("div");
var calls = 0;
target.addEventListener(type, {
get handleEvent() {
calls++;
return function() {};
},
});
assert_equals(calls, 0);
target.dispatchEvent(new Event(type));
target.dispatchEvent(new Event(type));
assert_equals(calls, 2);
}, "performs `Get` every time event is dispatched");
test(function(t) {
var type = "foo";
var target = document.createElement("div");
var calls = 0;
var eventListener = function() { calls++; };
eventListener.handleEvent = t.unreached_func("`handleEvent` method should not be called on functions");
target.addEventListener(type, eventListener);
target.dispatchEvent(new Event(type));
assert_equals(calls, 1);
}, "doesn't call `handleEvent` method on callable `EventListener`");
const uncaught_error_test = async (t, getHandleEvent) => {
const type = "foo";
const target = document.createElement("div");
let calls = 0;
target.addEventListener(type, {
get handleEvent() {
calls++;
return getHandleEvent();
},
});
const timeout = () => {
return new Promise(resolve => {
t.step_timeout(resolve, 0);
});
};
const eventWatcher = new EventWatcher(t, window, "error", timeout);
const errorPromise = eventWatcher.wait_for("error");
target.dispatchEvent(new Event(type));
const event = await errorPromise;
assert_equals(calls, 1, "handleEvent property was not looked up");
throw event.error;
};
promise_test(t => {
const error = { name: "test" };
return promise_rejects_exactly(t, error,
uncaught_error_test(t, () => { throw error; }));
}, "rethrows errors when getting `handleEvent`");
promise_test(t => {
return promise_rejects_js(t, TypeError, uncaught_error_test(t, () => null));
}, "throws if `handleEvent` is falsy and not callable");
promise_test(t => {
return promise_rejects_js(t, TypeError, uncaught_error_test(t, () => 42));
}, "throws if `handleEvent` is thruthy and not callable");
</script>
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