AngularJS Form Validation

<div class="form-group" ng-class="{ 'has-error' : userForm.name.$invalid && !userForm.name.$pristine }">
            <label>Name</label>
            <input type="text" name="name" class="form-control" ng-model="user.name" required>
            <p ng-show="userForm.name.$invalid && !userForm.name.$pristine" class="help-block">You name is required.</p>
          </div>

<div class="form-group" ng-class="{ 'has-error' : userForm.username.$invalid && !userForm.username.$pristine }">
            <label>Username</label>
            <input type="text" name="username" class="form-control" ng-model="user.username" ng-minlength="3" ng-maxlength="8">
            <p ng-show="userForm.username.$error.minlength" class="help-block">Username is too short.</p>
            <p ng-show="userForm.username.$error.maxlength" class="help-block">Username is too long.</p>
          </div>

<div class="form-group" ng-class="{ 'has-error' : userForm.email.$invalid && !userForm.email.$pristine }">
            <label>Email</label>
            <input type="email" name="email" class="form-control" ng-model="user.email">
            <p ng-show="userForm.email.$invalid && !userForm.email.$pristine" class="help-block">Enter a valid email.</p>
          </div>

<button type="submit" class="btn btn-primary" ng-disabled="userForm.$invalid">Submit</button>

</form>
      </div>
      <div class="col-sm-6">
        
        <div class="row">
          <div class="col-xs-3">
            <h3>Form</h3>
            <table class="table table-bordered">
              <tbody>
                <tr>
                  <td ng-class="{ success: userForm.$valid, danger: userForm.$invalid }">Valid</td>
                </tr>
                <tr>
                  <td ng-class="{ success: userForm.$pristine, danger: !userForm.$pristine }">Pristine</td>
                </tr>
                <tr>
                  <td ng-class="{ success: userForm.$dirty }">Dirty</td>
                </tr>
              </tbody>
            </table>
          </div>
          <div class="col-xs-3">
            <h3>Name</h3>
            <table class="table table-bordered">
              <tbody>
                <tr>
                  <td ng-class="{ success: userForm.name.$valid, danger: userForm.name.$invalid }">Valid</td>
                </tr>
                <tr>
                  <td ng-class="{ success: userForm.name.$pristine, danger: !userForm.name.$pristine }">Pristine</td>
                </tr>
                <tr>
                  <td ng-class="{ success: userForm.name.$dirty }">Dirty</td>
                </tr>
                <tr>
                  <td ng-class="{ success: userForm.name.$touched }">Touched</td>
                </tr>
              </tbody>
            </table>
          </div>
          <div class="col-xs-3">
            <h3>Username</h3>
            <table class="table table-bordered">
              <tbody>
                <tr>
                  <td ng-class="{ success: userForm.username.$valid, danger: userForm.username.$invalid }">Valid</td>
                </tr>
                <tr>
                  <td ng-class="{ success: userForm.username.$pristine, danger: !userForm.username.$pristine }">Pristine</td>
                </tr>
                <tr>
                  <td ng-class="{ success: userForm.username.$dirty }">Dirty</td>
                </tr>
                <tr>
                  <td ng-class="{ success: userForm.username.$touched }">Touched</td>
                </tr>
              </tbody>
            </table>
          </div>
          <div class="col-xs-3">
            <h3>Email</h3>
            <table class="table table-bordered">
              <tbody>
                <tr>
                  <td ng-class="{ success: userForm.email.$valid, danger: userForm.email.$invalid }">Valid</td>
                </tr>
                <tr>
                  <td ng-class="{ success: userForm.email.$pristine, danger: !userForm.email.$pristine }">Pristine</td>
                </tr>
                <tr>
                  <td ng-class="{ success: userForm.email.$dirty }">Dirty</td>
                </tr>
                <tr>
                  <td ng-class="{ success: userForm.email.$touched }">Touched</td>
                </tr>
              </tbody>
            </table>
          </div>
        </div>

</div>
    </div>
  </div>