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avatar Drupal

After rendering entity form how can be modified?

br flag
golddragon007

I rendering a custom entity form display with the following code:

$form = $this->entityFormBuilder->getForm($entity, 'array_delimiter');

This is perfect, as it shows what I set on the form display. However when I try to add a new submit callback function (i.e. $form['actions']['submit']['#submit'][] = 'custom_callback';) then this is not being called.
When I try to hide some form items, I lose their data. (i.e. $form['status']['#access'] = FALSE;).

But when I do all of this in a hook_form_FORM_ID_alter it does work as expected. The callback is being called while hidden form element values are not lost.

Is there a way to do this without an extra hook_form_FORM_ID_alter?

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Kevin avatar
in flag
Kevin
You can't add it there, bevause the builder functions don't know about your added code. Thus, you need the alter hook.
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Jaypan avatar
de flag
Jaypan
This should be done in a form_alter hook.
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br flag
golddragon007
No, I don't need form_alter, I just need to extend the form render object and set there everything and give that instead of the original when I set the render object for the `array_delimiter` display
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Kevin avatar
in flag
Kevin
You didn't mention that.
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Score:1
4uk4 avatar Drupal
cn flag
4uk4

Forms are rendered in three stages:

  1. The structure of the form is built in FormInterface::buildForm. The result can be altered in a hook_form_alter().

  2. The form elements are processed. Only form elements which are processed can be submitted.

  3. The final render array of the form is rendered.

Despite the name the form builder not only builds the form elements, but also processes them, so that they are ready to be rendered. More complex form elements require this step because the final render structure is built in #process callbacks. But even simple form elements rendering fine without processing can't be submitted.

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br flag
golddragon007
Aha, so the only workaround for this is to extend the original form class and instead of giving the original form object as render object, I give my extended form. Therefore the point 2 and 3 did not run yet when I changed some of the values of the form.
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br flag
golddragon007
Yes, and it does work, because anyway I need to define the new form display's render object, I can extend the already existing one to add there the callback and extra fields, like this there's no random codes everywhere.
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4uk4 avatar
cn flag
4uk4
Yes, this is the most straightforward way. Set the extended form class as form handler in the entity type annotations.
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