I have form with static fields and dynamic fields as follow:


  1. textfield00 (require = true)
  2. textfield01 (require = true)


  1. textfield02


  1. add textfield

  2. submit button

so, everytime add textfield pressed, it will add new/duplicate textfield02.

with add textfield code as follow:

$form['fields']['modules']['add'] = array(
      '#type' => 'submit',
      '#name' => 'addtextfield',
      '#value' => t('Add more TextField'),
      '#submit' => array(array($this, 'addTextfieldSubmit')),
      '#ajax' => array(
        'callback' => array($this, 'addTextFieldCallback'),
        'wrapper' => 'wrapper',
        'effect' => 'fade',

the adding field is working fine, the only problem i have here is: because textfield00 and textfield01 is mandatory, if i pressed add button, it will send me an error message 'mandatory fields' before i can add new textfield.

so how can i 'bypass' the requried validation, everytime i press add textfiled and only validate 'required = true' when i press submit button.

Thank You, AnD

  • 1
    Add the #limit_validation_errors property to your ajax button.
    – Eyal
    Commented Jun 11, 2016 at 11:08

1 Answer 1


'#limit_validation_errors' => array();

$form['actions']['previous'] = array(
    '#type' => 'submit',
    '#value' => t('Previous'),
    '#limit_validation_errors' => array(
      // Validate $form_state->getValue('step1').
      // Validate $form_state->getValue(array('foo', 'bar')).
      array('foo', 'bar'),
    '#submit' => array('some_submit_function'), // #submit required.

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