Pixeldust Drupal Support Service

Set a form element value to an empty string when it fails validation

I need to set the value of a form element to an empty string, when it doesn’t pass validation.

I tried using the following code, but the form element still contains the last submitted value, when the form is re-built.

public function validateForm(array &$form, FormStateInterface $form_state) {   $values = $form_state->getValues();   if ($values['myfield'] != 'something') {     $form_state->setValue('myfield', '');     $form_state->setErrorByName('myfield', $this->t('Sorry, this field value is not correct.'));   } }

A workaround I found is using the following code.

public function validateForm(array &$form, FormStateInterface $form_state) {   $values = $form_state->getValues();   if ($values['myfield'] != 'something') {     $form['myfield']['#value'] = '';     $form_state->setErrorByName('myfield', $this->t('Sorry, this field value is not correct.'));   } }

Instead of calling $form_state->setValue('myfield', ''), it sets the value of #value in the $form array.

It doesn’t seem the correct solution, though. How can I achieve what I want?

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Set a form element value to an empty string when it fails validation

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