By tarnus on

I'm building a custom form for one of my content types. I want to be able to import some of the existing fields and save out the node programmatically.

On drupal 7 I always used the field_attach_form function to do this for me. It looks like that function has been removed in Drupal 8. Can anyone give me some pointers on how I can do the same thing and include fields from a content type in my custom form?

I've scoured the internet looking for this all day, any help would be appreciated.

Thanks

⋅ Categories: Drupal 8.x

Comments

Ismail Cherri’s picture

Ismail Cherri commented

You could use the following code:

<?php
//Create an empty representative entity
$node = \Drupal::service('entity_type.manager')->getStorage('node')->create(array(
                'type' => 'article'
            )
        );

//Get the EntityFormDisplay (i.e. the default Form Display) of this content type
$entity_form_display = \Drupal::service('entity_type.manager')->getStorage('entity_form_display')
                                        ->load('node.article.default');

//Get the body field widget and add it to the form
if ($widget = $entity_form_display->getRenderer('body')) { //Returns the widget class
  $items = $entity->get('body''); //Returns the FieldItemsList interface
  $items->filterEmptyItems();
  $form['body'] = $widget->form($items, $form, $form_state); //Builds the widget form and attach it to your form
  $form['body']['#access'] = $items->access('edit');
}
webdevfreak’s picture

webdevfreak commented

This code works for me in Drupal 9 apart from following i.e 

a) Variable $node on line 2 should be replaced with $entity as called here

$items = $entity->get('body''); //Returns the FieldItemsList interface

b) Add this line at the end otherwise it throws strange error i.e 

$form['#parents'] = [];

c) Also we can render most of our content type fields by using foreach loop e.g 

// Content type field array.
$field_array = [
'title',
'field_registered_address',
'field_billing_address',
'field_shipping_address',
];
 

// Loop
foreach ($entity_form_display->getComponents() as $name => $component) {
if(in_array($name, $field_array)){
$widget = $entity_form_display->getRenderer($name);

if (!$widget) {
continue;
}

$items = $entity->get($name);
$items->filterEmptyItems();
$form[$name] = $widget->form($items, $form, $form_state);
$form[$name]['#access'] = $items->access('edit');
}

$form['#parents'] = [];
}

bojanz’s picture

bojanz commented

You use the form display object for that.

  $form_display = EntityFormDisplay::collectRenderDisplay($entity, $form_mode);
  $form_display->buildForm($entity, $entity_form, $form_state);

See EntityInlineForm in inline_entity_form for an example that has validation and submission as well.