hook_validate

Versions

mediamosa-21

hook_validate($node, &$form)

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.

Parameters

$node The node being validated.

$form The form being used to edit the node.

Related topics

Node API Hooks

The Node API allows modules to define content types, to modify content types created in the user interface, and to modify content types created by other modules.

Hooks

Allow modules to interact with the Drupal core.

Code

modules/node/node.api.php, line 1124

<?php
function hook_validate($node, &$form) {
  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.'));
    }
  }
}
?>