TL;DR: The hook is correct, but $node->content['mymodule']['#items'][0]
should at least contain one of these array indexes/properties: "#markup" or "#theme"; if you don't use one of them, Drupal will not output anything.
If the array indexes you use are for properties handled by your theme function, then you should use # at the beginning; for example "format" would become "#format" (the same is true for the other properties).
Anyway, there is no need to use "format" as you do (whatever meaning it has); the function just output HTML, as done in the example shown in the hook_node_view() example.
function hook_node_view($node, $view_mode, $langcode) {
$node->content['my_additional_field'] = array(
'#markup' => $additional_field,
'#weight' => 10,
'#theme' => 'mymodule_my_additional_field',
);
}
If you want some more concrete examples of that hook implementations, you can look at book_node_view(), statistics_node_view(), and translation_node_view().
function book_node_view($node, $view_mode) {
if ($view_mode == 'full') {
if (!empty($node->book['bid']) && empty($node->in_preview)) {
$node->content['book_navigation'] = array(
'#markup' => theme('book_navigation', array('book_link' => $node->book)),
'#weight' => 100,
);
}
}
if ($view_mode != 'rss') {
book_node_view_link($node, $view_mode);
}
}
As side note, I will add that you should use the # character only for properties, or you are going to confuse Drupal, which expects that character to be used only for properties.
In fact, element_children(), which returns the list of child elements of the element passed as argument, uses the following code:
foreach ($elements as $key => $value) {
if ($key === '' || $key[0] !== '#') {
$children[$key] = $value;
if (is_array($value) && isset($value['#weight'])) {
$sortable = TRUE;
}
}
}
As you see, elements whose key value starts with # are not taken to be child elements; differently, Drupal would not be able to handle a case like this one (the code is really implemented by a Drupal module, the Search module):
$form['#action'] = url($action);
// Record the $action for later use in redirecting.
$form_state['action'] = $action;
$form['#attributes']['class'][] = 'search-form';
$form['module'] = array(
'#type' => 'value',
'#value' => $module,
);
$form['basic'] = array(
'#type' => 'container',
'#attributes' => array('class' => array('container-inline')),
);
$form['basic']['keys'] = array(
'#type' => 'textfield',
'#title' => $prompt,
'#default_value' => $keys,
'#size' => $prompt ? 40 : 20,
'#maxlength' => 255,
);
// processed_keys is used to coordinate keyword passing between other forms
// that hook into the basic search form.
$form['basic']['processed_keys'] = array(
'#type' => 'value',
'#value' => '',
);
$form['basic']['submit'] = array(
'#type' => 'submit',
'#value' => t('Search'),
);
Are $form['#action']
and $form['basic']['submit']
child elements?
As another side note, I will add that hook_view()
is invoked by Drupal only for the modules that implement a content type.
In fact, the implementations of that hook are invoked by node_build_content() using the following code:
// The 'view' hook can be implemented to overwrite the default function
// to display nodes.
if (node_hook($node, 'view')) {
$node = node_invoke($node, 'view', $view_mode, $langcode);
}
The code for node_invoke() is the following one:
if (node_hook($node, $hook)) {
$base = node_type_get_base($node);
$function = $base . '_' . $hook;
return ($function($node, $a2, $a3, $a4));
}
The code invokes $hook
for the module implementing the content type of the node passed as argument.