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Implement window.event property

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Add the deprecated-but-widely-used window.event property that returns
the Event currently being handled. Returns undefined when no event is
being dispatched.

Implementation saves and restores window._current_event around handler
invocation in both dispatchDirect and dispatchNode, supporting nested
event dispatch correctly.

Fixes #1770

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Matt Van Horn
2026-03-16 20:42:45 -07:00
parent c9753a690d
commit 96f24a2662
3 changed files with 53 additions and 0 deletions
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13
src/browser/EventManager.zig
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@@ -233,6 +233,12 @@ const DispatchDirectOptions = struct {
pub fn dispatchDirect(self: *EventManager, target: *EventTarget, event: *Event, handler: anytype, comptime opts: DispatchDirectOptions) !void {
const page = self.page;
// Set window.event to the currently dispatching event (WHATWG spec)
const window = page.window;
const prev_event = window._current_event;
window._current_event = event;
defer window._current_event = prev_event;
event.acquireRef();
defer event.deinit(false, page._session);
@@ -398,6 +404,13 @@ fn dispatchNode(self: *EventManager, target: *Node, event: *Event, comptime opts
}
const page = self.page;
// Set window.event to the currently dispatching event (WHATWG spec)
const window = page.window;
const prev_event = window._current_event;
window._current_event = event;
defer window._current_event = prev_event;
var was_handled = false;
// Create a single scope for all event handlers in this dispatch.

34
src/browser/tests/window/window_event.html Normal file
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@@ -0,0 +1,34 @@
<!DOCTYPE html>
<script src="../testing.js"></script>
<script id=windowEventUndefinedOutsideHandler>
testing.expectEqual(undefined, window.event);
</script>
<script id=windowEventSetDuringWindowHandler>
var capturedEvent = null;
window.addEventListener('test-event', function(e) {
capturedEvent = window.event;
});
var ev = new Event('test-event');
window.dispatchEvent(ev);
testing.expectEqual(ev, capturedEvent);
testing.expectEqual(undefined, window.event);
</script>
<script id=windowEventRestoredAfterHandler>
var captured2 = null;
window.addEventListener('test-event-2', function(e) {
captured2 = window.event;
});
var ev2 = new Event('test-event-2');
window.dispatchEvent(ev2);
testing.expectEqual(ev2, captured2);
testing.expectEqual(undefined, window.event);
</script>

6
src/browser/webapi/Window.zig
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@@ -68,6 +68,7 @@ _on_popstate: ?js.Function.Global = null,
_on_error: ?js.Function.Global = null,
_on_message: ?js.Function.Global = null,
_on_unhandled_rejection: ?js.Function.Global = null, // TODO: invoke on error
_current_event: ?*Event = null,
_location: *Location,
_timer_id: u30 = 0,
_timers: std.AutoHashMapUnmanaged(u32, *ScheduleCallback) = .{},
@@ -90,6 +91,10 @@ pub fn asEventTarget(self: *Window) *EventTarget {
return self._proto;
}
pub fn getEvent(self: *const Window) ?*Event {
return self._current_event;
}
pub fn getSelf(self: *Window) *Window {
return self;
}
@@ -805,6 +810,7 @@ pub const JsApi = struct {
pub const onerror = bridge.accessor(Window.getOnError, Window.setOnError, .{});
pub const onmessage = bridge.accessor(Window.getOnMessage, Window.setOnMessage, .{});
pub const onunhandledrejection = bridge.accessor(Window.getOnUnhandledRejection, Window.setOnUnhandledRejection, .{});
pub const event = bridge.accessor(Window.getEvent, null, .{ .null_as_undefined = true });
pub const fetch = bridge.function(Window.fetch, .{});
pub const queueMicrotask = bridge.function(Window.queueMicrotask, .{});
pub const setTimeout = bridge.function(Window.setTimeout, .{});