function form_type_image_button_value

Determines the value for an image button form element.

Parameters

$form: The form element whose value is being populated.

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

$form_state: A keyed array containing the current state of the form.

Return value

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

Related topics

File

drupal/includes/form.inc, line 2301

Functions for form and batch generation and processing.

Code

function form_type_image_button_value($form, $input, $form_state) {
  if ($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 $form['#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['input'];
      foreach (explode('[', $form['#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 $form['#return_value'];
          }
          return NULL;
        }
        $input = $input[$element_name];
      }
      return $form['#return_value'];
    }
  }
}