/**
* Helper function to print the actual chart.
*
* @param $item \Drupal\Core\Field\FieldItemInterface
* The field item
* @param int $entity_id
* The entity id
* @param int $delta
* The delta
*
* @return string $output
* The field output.
*/
public function easychartPrintChart(FieldItemInterface $item, $entity_id, $delta)
{
$values = $item->getValue();
$output = [];
// Verify csv being given.
if (empty($values['csv'])) {
return FALSE;
} else {
// Print a div for js to pick up & render chart.
$output['markup'] = '<div class="easychart-embed--' . $entity_id . '-' . $delta . '"></div>';
// Add config to output.
$output['config'] = $values['config'];
// Add csv to output.
$output['csv'] = !empty($values['csv']) ? $values['csv'] : '';
}
return $output;
}
/**
* {@inheritdoc}
*/
public function viewFieldItem(FieldItemInterface $item, $display = array())
{
$entity = $item->getEntity();
$field_name = $item->getFieldDefinition()->getName();
// Clone the entity since we are going to modify field values.
$clone = clone $entity;
// Push the item as the single value for the field, and defer to viewField()
// to build the render array for the whole list.
$clone->{$field_name}->setValue(array($item->getValue()));
$elements = $this->viewField($clone->{$field_name}, $display);
// Extract the part of the render array we need.
$output = isset($elements[0]) ? $elements[0] : array();
if (isset($elements['#access'])) {
$output['#access'] = $elements['#access'];
}
return $output;
}
