[Webkit-unassigned] [Bug 156730] New: MediaQueryList.addListener does not support Object with handleEvent() method
bugzilla-daemon at webkit.org
bugzilla-daemon at webkit.org
Mon Apr 18 22:18:56 PDT 2016
https://bugs.webkit.org/show_bug.cgi?id=156730
Bug ID: 156730
Summary: MediaQueryList.addListener does not support Object
with handleEvent() method
Classification: Unclassified
Product: WebKit
Version: WebKit Nightly Build
Hardware: Unspecified
OS: Unspecified
Status: NEW
Severity: Normal
Priority: P2
Component: CSS
Assignee: webkit-unassigned at lists.webkit.org
Reporter: nkronlage at hotmail.com
Repro:
var query = matchMedia("(min-width: 400px)");
var listener = {
handleEvent: function() {
document.body.style.background = query.matches ? 'red' : 'blue';
}
}
query.addListener(listener);
listener.handleEvent();
Runnable: https://jsfiddle.net/j4278otv/
Running this results in the error: "[Error] TypeError: Argument 1 ('listener') to MediaQueryList.addListener must be a function"
The spec (https://drafts.csswg.org/cssom-view/#mediaquerylist) says the parameter to addListener is an EventListener (https://dom.spec.whatwg.org/#callbackdef-eventlistener):
callback interface EventListener {
void handleEvent(Event event);
};
but the implementation only allows functions.
The Node.addEventListener method does support the Object with handleEvent() method: See https://jsfiddle.net/6nL0epf3/
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