jQuery Validate plugin, enable submit button when form is valid

Question

I have an enabled and disabled state for the submit button on my form.

The conditions are as follows:

If all input fields have been entered and are

Answer 1

$('form').find(':input').each(function(index, value){
    //action for every element
    $(value);
});

In this case you can do this that way: (but I dont like this solution)

var areSomeFieldsEmpty = false;
$('form').find(':input').each(function(i, v){
  if ($(v).val().length <= 0){
     areSomeFieldsEmpty = true;
  }
});

if (!areSomeFieldsEmpty){
  //unlock form   
}

http://jsfiddle.net/89y26/335/