Set an email field to allow multiple emails:
document.getElementById("myEmail").multiple = true;
Click button to allow multiple emails for the email field on form submission.
Separate each email with a comma, like: mail@example.com, mail2@example.com.
<!DOCTYPE html> <html> <body> <form action="/action_page.php"> E-mail: <input type="email" id="myEmail" name="usremail"> <input type="submit"> </form>//w ww. jav a 2s .c o m <button onclick="myFunction()">Test</button> <p id="demo"></p> <script> function myFunction() { document.getElementById("myEmail").multiple = true; document.getElementById("demo").innerHTML = "The email field now accept multiple values."; } </script> </body> </html>