1. drupal
    1. 6
    2. 8
    3. 7
6 form_type_checkbox_value($form, $edit = FALSE)
7 – 8 form_type_checkbox_value($element, $input = FALSE)

Helper function to determine the value for a checkbox form element.


$form The form element whose value is being populated.

  • @param $input The incoming input to populate the form element. If this is FALSE, the element's default value should be returned.

Return value

The data that will appear in the $element_state['values'] collection for this element. Return nothing to use the default.

Related topics


includes/, line 2205

function form_type_checkbox_value($element, $input = FALSE) {
  if ($input === FALSE) {
    // Use #default_value as the default value of a checkbox, except change
    // NULL to 0, because _form_builder_handle_input_element() would otherwise
    // replace NULL with empty string, but an empty string is a potentially
    // valid value for a checked checkbox.
    return isset($element['#default_value']) ? $element['#default_value'] : 0;
  else {
    // Checked checkboxes are submitted with a value (possibly '0' or ''):
    // For checked checkboxes, browsers submit the string version of
    // #return_value, but we return the original #return_value. For unchecked
    // checkboxes, browsers submit nothing at all, but
    // _form_builder_handle_input_element() detects this, and calls this
    // function with $input=NULL. Returning NULL from a value callback means to
    // use the default value, which is not what is wanted when an unchecked
    // checkbox is submitted, so we use integer 0 as the value indicating an
    // unchecked checkbox. Therefore, modules must not use integer 0 as a
    // #return_value, as doing so results in the checkbox always being treated
    // as unchecked. The string '0' is allowed for #return_value. The most
    // common use-case for setting #return_value to either 0 or '0' is for the
    // first option within a 0-indexed array of checkboxes, and for this,
    // form_process_checkboxes() uses the string rather than the integer.
    return isset($input) ? $element['#return_value'] : 0;