Source Code:
<!DOCTYPE html> <html> <head> <script> function checkForm() { alert("The form is submitted"); } </script> </head> <body> <form action="demo_form.asp" onsubmit="checkForm()"> First name: <input type="text" name="fname"><br> Last name: <input type="text" name="lname"><br> <input type="submit" value="Submit"> <p>The function checkForm() is triggered when the submit button is clicked. The function shows a message to the user.</p> </body> </html>
Result:
W3Schools.com
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