title: Using jQuery validate plugin to output a single error message for multiple fields
body: <p>I'm using the jQuery validate plugin to validate a form. All fields are mandatory and space for error messages is limited on the form, so is it possible to show a single error message if any of the fields from my rules aren't completed which says, 'All fields must be completed before you submit the form' ?</p>
  
  <p>My jQuery knowledge is limited and I can only figure from examples how to set it up so that it outputs individual error messages for each field using the following code:</p>
  
  <pre><code>$(".contact-form").validate({
    errorLabelContainer: ".form-errors",
    wrapper: "li",
    ignore: ".ignore",
    errorElement: "em",
    rules: {
      first_name: { required: true },
      last_name: { required: true },
      email: { required: true, email: true }
    },
    messages: {
      first_name: "Please enter your first name",
      last_name: "Please enter your last name",
      email: { required: "Please enter your email address", email: "Your email address must be in the format of name@domain.com" }
    },
  });
  </code></pre>