Form submission handler for upload/remove button of file_field_widget_form().
This runs in addition to and after file_managed_file_submit().
file_field_widget_form()
function file_field_widget_submit($form, &$form_state) {
// During the form rebuild, file_field_widget_form() will create field item
// widget elements using re-indexed deltas, so clear out $form_state['input']
// to avoid a mismatch between old and new deltas. The rebuilt elements will
// have #default_value set appropriately for the current state of the field,
// so nothing is lost in doing this.
$parents = array_slice($form_state['triggering_element']['#parents'], 0, -2);
NestedArray::setValue($form_state['input'], $parents, NULL);
$button = $form_state['triggering_element'];
// Go one level up in the form, to the widgets container.
$element = NestedArray::getValue($form, array_slice($button['#array_parents'], 0, -1));
$field_name = $element['#field_name'];
$langcode = $element['#language'];
$parents = $element['#field_parents'];
$submitted_values = NestedArray::getValue($form_state['values'], array_slice($button['#parents'], 0, -2));
foreach ($submitted_values as $delta => $submitted_value) {
if (empty($submitted_value['fids'])) {
unset($submitted_values[$delta]);
}
}
// If there are more files uploaded via the same widget, we have to separate
// them, as we display each file in it's own widget.
$new_values = array();
foreach ($submitted_values as $delta => $submitted_value) {
if (is_array($submitted_value['fids'])) {
foreach ($submitted_value['fids'] as $fid) {
$new_value = $submitted_value;
$new_value['fids'] = array(
$fid,
);
$new_values[] = $new_value;
}
}
else {
$new_value = $submitted_value;
}
}
// Re-index deltas after removing empty items.
$submitted_values = array_values($new_values);
// Update form_state values.
NestedArray::setValue($form_state['values'], array_slice($button['#parents'], 0, -2), $submitted_values);
// Update items.
$field_state = field_form_get_state($parents, $field_name, $langcode, $form_state);
$field_state['items'] = $submitted_values;
field_form_set_state($parents, $field_name, $langcode, $form_state, $field_state);
}