On right click of an element, when the context menu opens, then it is known as oncontextmenu in JavaScript.
Example
You can try to run the following code to learn how to work with oncontextmenu event in JavaScript −
<html>
<head>
<script>
<!--
function sayHello() {
alert("You right clicked here.")
}
//-->
</script>
</head>
<body>
<p oncontextmenu = "sayHello()">Right click</p>
</body>
</html>