public static RenderElement::processAjaxForm(&$element, FormStateInterface

Provides a render element that wraps child elements in a container. Surrounds child elements with a <div> and adds attributes such as

public static ImageButton::preRenderButton($element)

public static Link::preRenderLink($element) Pre-render

public static PasswordConfirm::validatePasswordConfirm(&$element

public PasswordConfirm::getInfo()

Provides a form element for a drop-down menu or scrolling selection box. Properties: #options:

public static Checkboxes::detectEmptyCheckboxes(array $input)

public static Color::preRenderColor($element) Prepares

public static Select::valueCallback(&$element, $input, FormStateInterface