<!DOCTYPE html>
<html>
<body>
<p>This example contains a form with a submit button that submits the form to "/action_page.php":</p>
<form>
First name: <input type="text" name="fname" value="Donald"><br>
Last name: <input type="text" name="lname" value="Duck"><br>
<input type="submit" id="mySubmit" formaction="/action_page.php" value="Submit">
</form>
<p>Click the "Try it" button to change the value of the formaction attribute of the submit button above.</p>
<p><b>Note:</b> Click on the submit button before and after you have clicked on the "Try it" button.</p>
<p id="demo"></p>
<button onclick="myFunction()">Try it</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>