<!DOCTYPE html>
<html lang="en-US">
<body>
<p>Type your name and click 'Submit'.</p>
<form action="/name.php" method="get">
<input type="text" name="myName">
<input type="submit" value="Submit">
</form>
<script>
var x = document.getElementsByTagName("form")[0];
function myFunction() {
alert("I'm going to submit a form");
}
x.onsubmit = myFunction;
</script> </body>
</html>