/**
* {@inheritdoc}
*/
public function preprocessElement(Element $element, Variables $variables)
{
// Set errors flag.
$variables['errors'] = $element->hasProperty('has_error');
if ($element->getProperty('autocomplete_route_name')) {
$variables['is_autocomplete'] = TRUE;
}
// See http://getbootstrap.com/css/#forms-controls.
$checkbox = $variables['is_checkbox'] = $element->isType('checkbox');
$radio = $variables['is_radio'] = $element->isType('radio');
// Determine if the form element should have the "form-group" class added.
// Use an explicitly set property from the element or use its other
// properties as the criteria to determine if it should be set.
$variables['is_form_group'] = $element->getProperty('form_group', !$variables['is_checkbox'] && !$variables['is_radio'] && !$element->isType(['hidden', 'textarea']));
// Add label_display and label variables to template.
$display = $variables['label_display'] = $variables['title_display'] = $element->getProperty('title_display');
// Place single checkboxes and radios in the label field.
if (($checkbox || $radio) && $display !== 'none' && $display !== 'invisible') {
$label = Element::create($variables['label']);
$children =& $label->getProperty('children', '');
$children .= $variables['children'];
unset($variables['children']);
// Pass the label attributes to the label, if available.
if ($element->hasProperty('label_attributes')) {
$label->setAttributes($element->getProperty('label_attributes'));
}
}
// Remove the #field_prefix and #field_suffix values set in
// template_preprocess_form_element(). These are handled at the input level.
// @see \Drupal\bootstrap\Plugin\Preprocess\Input::preprocess().
unset($variables['prefix']);
unset($variables['suffix']);
}
