function StyleForm::validateForm

Verifies that the user supplied an image with the form.

Overrides FormBase::validateForm

File

modules/image_example/src/Form/StyleForm.php, line 132

Class

StyleForm
Form for interacting with image styles.

Namespace

Drupal\image_example\Form

Code

public function validateForm(array &$form, FormStateInterface $form_state) {
    if (!$form_state->hasValue('image_fid') || !is_numeric($form_state->getValue('image_fid'))) {
        $form_state->setErrorByName('image_fid', $this->t('Please select an image to upload.'));
    }
}