The onClick event is the most frequently used event type, which occurs when a user clicks the left button of the mouse.
Example
You can put your validation, warning etc., against this event type.
Live Demo
<html>
<head>
<script>
<!--
function sayHello() {
alert("Hello World")
}
//-->
</script>
</head>
<body>
<p>Click the following button and see result</p>
<form>
<input type="button" onclick="sayHello()" value="Say Hello" />
</form>
</body>
</html>