Change the URL for where to send the form-data:
document.getElementById("mySubmit").formAction = "/action_page2.php";
Click the button to change the value of the formaction attribute of the submit button.
<!DOCTYPE html> <html> <body> <form> First name: <input type="text" name="fname" value="CSS"><br> Last name: <input type="text" name="lname" value="HTML"><br> <input type="submit" id="mySubmit" formaction="/action_page.php" value="Submit"> </form>//ww w . ja va 2 s. c o m <p id="demo"></p> <button onclick="myFunction()">Test</button> <script> function myFunction() { document.getElementById("mySubmit").formAction = "/action_page2.php"; document.getElementById("demo").innerHTML = "The value of the formaction attribute was changed to 'action_page2.php'."; } </script> </body> </html>