15 methods override FormElement::valueCallback() in Drupal 8

Checkbox::valueCallback in core/lib/Drupal/Core/Render/Element/Checkbox.php

Determines how user input is mapped to an element's #value property.

Checkboxes::valueCallback in core/lib/Drupal/Core/Render/Element/Checkboxes.php

Determines how user input is mapped to an element's #value property.

Datelist::valueCallback in core/lib/Drupal/Core/Datetime/Element/Datelist.php

Validates the date type to adjust 12 hour time and prevent invalid dates. If the date is valid, the date is set in the form.

Datetime::valueCallback in core/lib/Drupal/Core/Datetime/Element/Datetime.php

Determines how user input is mapped to an element's #value property.

ImageButton::valueCallback in core/lib/Drupal/Core/Render/Element/ImageButton.php

Determines how user input is mapped to an element's #value property.

ManagedFile::valueCallback in core/modules/file/src/Element/ManagedFile.php

Determines how user input is mapped to an element's #value property.

Password::valueCallback in core/lib/Drupal/Core/Render/Element/Password.php

Determines how user input is mapped to an element's #value property.

PasswordConfirm::valueCallback in core/lib/Drupal/Core/Render/Element/PasswordConfirm.php

Determines how user input is mapped to an element's #value property.

Radios::valueCallback in core/lib/Drupal/Core/Render/Element/Radios.php

Determines how user input is mapped to an element's #value property.

Range::valueCallback in core/lib/Drupal/Core/Render/Element/Range.php

Determines how user input is mapped to an element's #value property.

Select::valueCallback in core/lib/Drupal/Core/Render/Element/Select.php

Determines how user input is mapped to an element's #value property.

Table::valueCallback in core/lib/Drupal/Core/Render/Element/Table.php

Determines how user input is mapped to an element's #value property.

Textarea::valueCallback in core/lib/Drupal/Core/Render/Element/Textarea.php

Determines how user input is mapped to an element's #value property.

Textfield::valueCallback in core/lib/Drupal/Core/Render/Element/Textfield.php

Determines how user input is mapped to an element's #value property.

Token::valueCallback in core/lib/Drupal/Core/Render/Element/Token.php

Determines how user input is mapped to an element's #value property.