Форма на Bulma

Пример на Bulma:

<form>
  <div class="field">
    <label class="label">Username</label>
    <div class="control">
      <input class="input" type="text" name="name" value="">
    </div>
    <p class="help is-danger"></p>
  </div>

  <div class="field">
    <label class="label">Email</label>
    <div class="control">
      <input class="input" type="email" name="email" value="">
    </div>
    <p class="help is-danger"></p>
  </div>

  <div class="field is-grouped">
    <div class="control">
      <button type="submit" class="button is-link">Submit</button>
    </div>
    <div class="control">
      <button type="reset" class="button is-link is-light">Cancel</button>
    </div>
  </div>
</form>

Что сделать:

1. Добавить data-error для текста ошибки поля.
2. Добавить [data-success] и [data-validation-error] для AJAX-сообщений формы.
3. Проставить плейсхолдеры FormIt.
4. В fetchit.frontend.input.invalid.class указать is-danger.

Информация

В action укажите URL страницы.

modx

<form> 
<form action="[[~[[*id]]]]" method="post"> 
  <div class="field">
    <label class="label">Username</label>
    <div class="control">
      <input class="input" type="text" name="name" value=""> 
      <input class="input" type="text" name="name" value="[[+fi.name]]"> 
    </div>
    <p class="help is-danger"></p> 
    <p class="help is-danger" data-error="name">[[+fi.error.name]]</p> 
  </div>

  <div class="field">
    <label class="label">Email</label>
    <div class="control">
      <input class="input" type="email" name="email" value=""> 
      <input class="input" type="email" name="email" value="[[+fi.email]]"> 
    </div>
    <p class="help is-danger"></p> 
    <p class="help is-danger" data-error="email">[[+fi.error.email]]</p> 
  </div>

  <div class="notification is-success" role="alert" data-success style="display: none;"></div> 
  <div class="notification is-danger" role="alert" data-validation-error style="display: none;"></div> 

  <div class="field is-grouped">
    <div class="control">
      <button type="submit" class="button is-link">Submit</button>
    </div>
    <div class="control">
      <button type="reset" class="button is-link is-light">Cancel</button>
    </div>
  </div>
</form>

fenom

<form> 
<form action="{$_modx->resource.id | url}" method="post"> 
  <div class="field">
    <label class="label">Username</label>
    <div class="control">
      <input class="input" type="text" name="name" value=""> 
      <input class="input" type="text" name="name" value="{$_modx->getPlaceholder('fi.name')}"> 
    </div>
    <p class="help is-danger"></p> 
    <p class="help is-danger" data-error="name">{$_modx->getPlaceholder('fi.error.name')}</p> 
  </div>

  <div class="field">
    <label class="label">Email</label>
    <div class="control">
      <input class="input" type="email" name="email" value=""> 
      <input class="input" type="email" name="email" value="{$_modx->getPlaceholder('fi.email')}"> 
    </div>
    <p class="help is-danger"></p> 
    <p class="help is-danger" data-error="email">{$_modx->getPlaceholder('fi.error.email')}</p> 
  </div>

  <div class="notification is-success" role="alert" data-success style="display: none;"></div> 
  <div class="notification is-danger" role="alert" data-validation-error style="display: none;"></div> 

  <div class="field is-grouped">
    <div class="control">
      <button type="submit" class="button is-link">Submit</button>
    </div>
    <div class="control">
      <button type="reset" class="button is-link is-light">Cancel</button>
    </div>
  </div>
</form>