<form data-toggle="validator" role="form"> <div class="form-group"> <label for="inputName" class="control-label">Name</label> <input type="text" class="form-control" id="inputName" placeholder="Cina Saffary" required> </div> <div class="form-group has-feedback"> <label for="inputTwitter" class="control-label">Twitter</label> <div class="input-group"> <span class="input-group-addon">@</span> <input