1. drupal
    1. 5 node.php
    2. 6 node.php
    3. 7
    4. 8
5 – 6 hook_validate($node, &$form)
7 – 8 hook_validate($node, $form, &$form_state)

Perform node validation before a node is created or updated.

This hook is invoked only on the module that defines the node's content type (use hook_node_validate() to act on all node validations).

This hook is invoked from node_validate(), after a user has finished editing the node and is previewing or submitting it. It is invoked at the end of all the standard validation steps, and before hook_node_validate() is invoked.

To indicate a validation error, use form_set_error().

Note: Changes made to the $node object within your hook implementation will have no effect. The preferred method to change a node's content is to use hook_node_presave() instead.


$node The node being validated.

$form The form being used to edit the node.

$form_state The form state array.

Related topics


modules/node/node.api.php, line 1222

function hook_validate($node, $form, &$form_state) {
  if (isset($node->end) && isset($node->start)) {
    if ($node->start > $node->end) {
      form_set_error('time', t('An event may not end before it starts.'));