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   1. drupal6
   2. drupal7

Validate node_admin_nodes form submissions.

Check if any nodes have been selected to perform the chosen 'Update option' on.

Code

modules/node/node.admin.inc, line 510

<?php
function node_admin_nodes_validate($form, &$form_state) {
  $nodes = array_filter($form_state['values']['nodes']);
  if (count($nodes) == 0) {
    form_set_error('', t('No items selected.'));
  }
}
?>