Question

I’m fairly new to Jquery, so this might be a simple problem, but is there a way to hide the submit button on a form until all the fields have been validated.

The validation would need to be an ‘as you type’ solution. Basically I have 3 fields – first name, last name and e-mail. I’d like the submit button to stay hidden until the two ‘name’ fields have been filled in and a valid e-mail address has been entered into the e-mail field.

The form itself uses AJAX to input the form data into a database. The form is in a lightbox which should automatically close once the submit button is clicked.

You can see an example here: http://testing.xenongroupadmin.com/whatis/pfi

Ignore the ‘Close this Window’ link – that’s just there for my convenience and will be removed in the final version.

Below is the HTML code for the form, followed by the JQuery/AJAX submission code:

<form id="registerform" action="thanks.php" method="POST">
 <ul id="inputform">
  <li>
   <label for="firstname" id="firstnamelabel">First Name</label>
   <input type="text" name="first_name" id="fname" class="registerboxes" />
  </li>
  <li>
   <label for="lastname" id="lastnamelabel">Last Name</label>
   <input type="text" name="last_name" id="lname" class="registerboxes" />
  </li>
  <li>
   <label for="email" id="emaillabel">E-mail Address</label>
   <input type="text" name="emailbox" id="email" class="registerboxes" />
  </li>
 </ul>
 <input type="submit" value="Submit" id="emailbutton" />
</form>

And the Jquery:

$(document).ready(function(){
 $("form#registerform").submit(function() {
  var fname     = $('#fname').attr('value');
  var lname     = $('#lname').attr('value');
  var email     = $('#email').attr('value');    

 $.ajax({
  type: "POST",
  url: "post.php",
  data: "fname="+ fname +"& lname="+ lname +"& email="+ email,
  success: function(){

 $('div#register-panel, div#lightbox').fadeOut(300);
   }
  });
  return false;
 });
});

Thanks!

Answer 1

http://jsfiddle.net/nickaknudson/KnZaq/

$(document).ready(function() {
    $('#emailbutton').hide();
    $('input').change(function(e) {
        if ($('#fname').val() && $('#lname').val() && $('#email').val() && validateEmail($('#email').val())) {
            $('#emailbutton').show();
        }
    });
});

var validateEmail = function(email) {
    var re = /^(([^<>()[\]\\.,;:\s@\"]+(\.[^<>()[\]\\.,;:\s@\"]+)*)|(\".+\"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
    return re.test(email);
};​

UPDATE

Sorry, it may have been buggy on that version of the fiddle. Try again?
http://jsfiddle.net/nickaknudson/KnZaq/3/

RESOURCES

• Validate email address in JavaScript?