Obtaining all values from a built form

Question

I'm building a form and setting values via

$form = \Drupal::formBuilder()->getForm('My\Module', ['key1' => 'x']);

where I set the passed key1 as the default values for the associated fields : in My\Module\buildForm, you would find

public function buildForm(array $form, FormStateInterface $form_state, $presets = array()) {

    $form['key1'] = [
      '#type' => 'textfield',
      '#default_value' => isset($presets['key1']) ? $presets['key1'] : $query->get('key1')
    ];

    return $form;
}

This takes place in a controller not directly related to the form and I'd like to retrieve all values set, either as defaults or as parameters of the page, something like ['key1' => 'x'] if no parameter is passed to the page or ['key1' => 'v1'] if the page is called with ?key1=v1

How can I get all the values on my form array (besides filtering on the field names)?

Answer 1

Probably you put the preset values in the default values of form elements. They are at this point only in $form.

The values in $form_state are filled after the form is submitted, as a result of a GET/POST request.

But then your code, that calls the formBuilder, has no longer control. This will be handled by the submit method you have defined for the form.