When a user copies the element’s content, then the oncopy event triggers.
Example
You can try to run the following code to learn how to implement oncopy event in JavaScript.
<!DOCTYPE html>
<html>
<body>
<input type = "text" oncopy = "copyFunction()" value = "copy the text">
<script>
function copyFunction() {
document.write("Text copied!");
}
</script>
</body>
</html>