title: JQuery.Validate only validates first field
body: <p>I've been struggling all day with a JQuery validate issue. Where it only validates the first field. </p>
  
  <p>I've managed to reproduce it here: </p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-js lang-js prettyprint-override"><code>$(document).ready(function() {
    $('#go').click(function() {
      
      console.log('go clicked');
      
      if ($('#detailsForm').valid()) {
        alert('if you see this then the form is valid.');
      }
  
    });
  });</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;!DOCTYPE html&gt;
  &lt;html&gt;
  
    &lt;head&gt;
      &lt;script data-require="jquery@1.10.0" data-semver="1.10.0" src="http://code.jquery.com/jquery-1.10.0.min.js"&gt;&lt;/script&gt;
      &lt;script data-require="jquery-validate@1.10.0" data-semver="1.10.0" src="//cdnjs.cloudflare.com/ajax/libs/jquery-validate/1.15.0/jquery.validate.js"&gt;&lt;/script&gt;
      &lt;script data-require="jquery-validate@1.10.0" data-semver="1.10.0" src="//cdnjs.cloudflare.com/ajax/libs/jquery-validate/1.15.0/additional-methods.js"&gt;&lt;/script&gt;
      &lt;link rel="stylesheet" href="style.css" /&gt;
      &lt;script src="script.js"&gt;&lt;/script&gt;
    &lt;/head&gt;
  
    &lt;body&gt;
      &lt;h1&gt;This doesn't work :(&lt;/h1&gt;
      
       &lt;form id="detailsForm"&gt;
  
          &lt;div class="row guttered-bottom"&gt;
  
              &lt;div class="col-md-6 col-xs-12"&gt;
  
  
                  &lt;div class="row"&gt;
                      &lt;div class="col-md-12 col-xs-12"&gt;
                          &lt;br /&gt;
                          First Name&lt;div style="color:#E320C9"&gt;*&lt;/div&gt;
                          &lt;div class="input-container"&gt;
                              &lt;input id="ReserveFirstName" type="text" class="input-large input-wide" placeholder="Enter your first name" required="true" /&gt;
                          &lt;/div&gt;
                      &lt;/div&gt;
                  &lt;/div&gt;
  
             &lt;div class="row"&gt;
                      &lt;div class="col-md-12 col-xs-12"&gt;
                          &lt;br /&gt;
                          Last Name&lt;div style="color:#E320C9"&gt;*&lt;/div&gt;
                          &lt;div class="input-container"&gt;
                              &lt;input id="ReserveLastName" type="text" class="input-large input-wide" placeholder="Enter your last name" required="true" /&gt;
                          &lt;/div&gt;
                      &lt;/div&gt;
                  &lt;/div&gt;
  
              &lt;/div&gt;
  
           
          &lt;/div&gt;
  
  
      &lt;/form&gt;
      
      &lt;br&gt;
      
      &lt;button id="go"&gt;CLICK ME! &lt;/button&gt;
    &lt;/body&gt;
  
  &lt;/html&gt;</code></pre>
  </div>
  </div>
  </p>
  
  <p>Steps to reproduce: click the button and observe that the validation message comes up for the first field (first name). Enter a first name and click the button again. Notice that the form seems to validate even though both fields are required. </p>
  
  <p>What am I doing wrong? </p>