function hook_validate

Verify a node editing form.

This is a hook used by node modules. It is called to allow the module to verify that the node is in a format valid to post to the site. It can also be used to make changes to the node before submission, such as node-type-specific formatting. Errors should be set with form_set_error().

Parameters

&$node: The node to be validated.

Return value

None.

To validate nodes of all types (not just nodes of the type(s) defined by this module), use hook_nodeapi() instead.

For a detailed usage example, see node_example.module.

Related topics

File

developer/hooks/node.php, line 250

These hooks are defined by node modules, modules that define a new kind of node.

Code

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