Bug 26127 – __defineSetter__/__defineGetter__ is ignored on native properties

• Component: WebCore JavaScript
• Status: RESOLVED DUPLICATE

[T. Brains]

When trying to attach a getter/setter to a native DOM property on an element, the getter/setter seems to be ignored and is never called. The original behavior is maintained.

Use this simple code testcase:

<div id="d"></div>
<script type="text/javascript">
var o=document.getElementById("d");

o.__defineSetter__("id",function () { alert("SET"); });

o.id="test";
</script>

Expected behavior: an alert saying "SET".
Actual behavior: nothing.

The same code works as expected in Firefox and Chrome.

Similarly, attaching the getter/setter on the prototype (for example, on HTMLDivElement.prototype) fails on Safari and Chrome as well, but works as expected in Firefox.

[T. Brains]

It's worth noting that this testcase also works as expected in Opera, and the same functionality can be achieved in IE8 using their getter/setter syntax:

Object.defineProperty(o, "id", { set: function () { alert("SET"); } });

/* or */

Object.defineProperty(HTMLDivElement.prototype, "id", { set: function () { alert("SET"); } });

[Alexey Proskuryakov]

Created attachment 30941 [details]
test case

Same test, as an attachment.

[Alexey Proskuryakov]

*** This bug has been marked as a duplicate of 12721 ***