Stop Hijacking Annoyances

Here’s another rescue from My Opera. The script was compiled by the user pehage on February 3, 2012, after a quick pointer by me. It is Opera UserJS, so it won’t work in any other browser. Don’t forget to enable User JavaScript on HTTPS if you so desire. In Opera 12 it no longer pops up a warning all the time.

// ==UserScript==
// @name Stop Hijacking Annoyances
// @include *
// ==/UserScript==

var annoyances = ["focus", "focusin", "focusout", /*"click",*/ "dblclick", "mousedown", "mouseup", "mousemove", "mouseover", "mouseout", "mouseenter", "mouseleave", "select", "submit", "keydown", "keypress", "keyup"];

for (var i=0; i<annoyances.length; i++) {
	//opera.postError(annoyances[i]);
	window.opera.addEventListener("BeforeEventListener." + annoyances[i], function (e) {
		e.preventDefault();
		//opera.postError(e);
	}, false);
}

And here is a simple testcase I created.

<!DOCTYPE html>
<html>
<head>
<title>keypress hijacker</title>
<script>
document.addEventListener('keypress', function(e){alert('document.addEventlistener on keypress ' + String.fromCharCode(e.which))}, false);
window.onkeydown = function(e){alert('window.onkeydown ' + String.fromCharCode(e.which))}
</script>
</head>
<body>
This page hijacks keypress events in order to display an alert message.
</body>
</html>

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