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Non-standard
This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.
Summary
The oncopy property returns the onCopy event handler code on the current element.
Syntax
element.oncopy = functionRef;
where functionRef is a function - often a name of a function declared elsewhere or a function expression. See JavaScript Reference:Functions for details.
Example
<!DOCTYPE html>
<html>
<head>
<title>oncopy event example</title>
<script>
function log(txt) {
document.getElementById("log").appendChild(document.createTextNode(txt + "\n"));
}
</script>
</head>
<body>
<div oncopy="log('Copy blocked!'); return false;">Try copying this text!</div>
<h3>Log</h3>
<textarea rows="15" cols="80" id="log" readonly="true"></textarea>
</body>
</html>
This example prevents the text from being copied out of the browser window.
Notes
This event is sent when the user attempts to copy text.
Since Firefox 13, the preference dom.event.clipboardevents.enabled controls this feature. It defaults to true but can be disabled.
Specification
Not part of specification.