function ImageButton::valueCallback

Overrides FormElement::valueCallback

File

core/lib/Drupal/Core/Render/Element/ImageButton.php, line 33

Class

ImageButton

Provides a form element for a submit button with an image.

Namespace

Code

public static function valueCallback(&$element, $input, FormStateInterface $form_state) {
    if ($input !== FALSE) {
        if (!empty($input)) {
            // If we're dealing with Mozilla or Opera, we're lucky. It will
            // return a proper value, and we can get on with things.
            return $element['#return_value'];
        }
        else {
            // Unfortunately, in IE we never get back a proper value for THIS
            // form element. Instead, we get back two split values: one for the
            // X and one for the Y coordinates on which the user clicked the
            // button. We'll find this element in the #post data, and search
            // in the same spot for its name, with '_x'.
            $input = $form_state->getUserInput();
            foreach (explode('[', $element['#name']) as $element_name) {
                // chop off the ] that may exist.
                if (substr($element_name, -1) == ']') {
                    $element_name = substr($element_name, 0, -1);
                }
                if (!isset($input[$element_name])) {
                    if (isset($input[$element_name . '_x'])) {
                        return $element['#return_value'];
                    }
                    return NULL;
                }
                $input = $input[$element_name];
            }
            return $element['#return_value'];
        }
    }
}