function hook_validate
hook_validate($node, $form, &$form_state)
Perform node validation before a node is created or updated.
This is a node-type-specific hook, which is invoked only for the node type being affected. See Node API hooks for more information.
Use hook_node_validate() to respond to node validation of all node types.
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.
$form_state: The form state array.
Related topics
File
- modules/node/node.api.php, line 1272
- Hooks provided by the Node module.
Code
function hook_validate($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.')); } } }
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https://api.drupal.org/api/drupal/modules!node!node.api.php/function/hook_validate/7.x