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<!DOCTYPE html> <html> <body> <p>This example uses the HTML DOM to assign an "onsubmit" event to a form element.</p> <p>When you submit the form, a function is triggered which alerts some text.</p> <form id="myForm" action="demo_form.asp"> Enter name: <input type="text" name="fname"> <input type="submit" value="Submit"> </form> <script> document.getElementById("myForm").onsubmit = function() {myFunction()}; function myFunction() { alert("The form was submitted"); } </script> </body> </html>