fields = array(
array(
'id' => 'transparent-header',
'label' => esc_html__('Transparent header', 'bulk'),
'type' => 'checkbox',
),
array(
'id' => 'header-font-color',
'label' => esc_html__('Transparent header font color', 'bulk'),
'type' => 'color',
),
);
add_action('add_meta_boxes', array($this, 'add_meta_boxes'));
add_action('save_post', array($this, 'save_post'));
}
/**
* Hooks into WordPress' add_meta_boxes function.
* Goes through screens (post types) and adds the meta box.
*/
public function add_meta_boxes() {
global $post;
if (!empty($post)) {
$pageTemplate = get_post_meta($post->ID, '_wp_page_template', true);
if ($pageTemplate == 'template-parts/template-homepage.php') {
foreach ($this->screens as $screen) {
add_meta_box(
'header-options', esc_html__('Header Options', 'bulk'), array($this, 'add_meta_box_callback'), $screen, 'normal', 'high'
);
}
}
}
}
/**
* Generates the HTML for the meta box
*
* @param object $post WordPress post object
*/
public function add_meta_box_callback($post) {
wp_nonce_field('header_options_data', 'header_options_nonce');
$this->generate_fields($post);
}
/**
* Generates the field's HTML for the meta box.
*/
public function generate_fields($post) {
$output = '';
foreach ($this->fields as $field) {
$label = '';
$db_value = get_post_meta($post->ID, 'header_options_' . $field['id'], true);
switch ($field['type']) {
case 'checkbox':
$input = sprintf(
'', $db_value === '1' ? 'checked' : '', $field['id'], $field['id']
);
break;
default:
$input = sprintf(
'', $field['type'] !== 'color' ? 'class="regular-text"' : '', $field['id'], $field['id'], $field['type'], $db_value
);
}
$output .= $this->row_format($label, $input);
}
echo '';
}
/**
* Generates the HTML for table rows.
*/
public function row_format($label, $input) {
return sprintf(
'| %s | %s |
|---|
', $label, $input
);
}
/**
* Hooks into WordPress' save_post function
*/
public function save_post($post_id) {
if (!isset($_POST['header_options_nonce']))
return $post_id;
$nonce = $_POST['header_options_nonce'];
if (!wp_verify_nonce($nonce, 'header_options_data'))
return $post_id;
if (defined('DOING_AUTOSAVE') && DOING_AUTOSAVE)
return $post_id;
foreach ($this->fields as $field) {
if (isset($_POST[$field['id']])) {
switch ($field['type']) {
case 'email':
$_POST[$field['id']] = sanitize_email($_POST[$field['id']]);
break;
case 'text':
$_POST[$field['id']] = sanitize_text_field($_POST[$field['id']]);
break;
}
update_post_meta($post_id, 'header_options_' . $field['id'], $_POST[$field['id']]);
} else if ($field['type'] === 'checkbox') {
update_post_meta($post_id, 'header_options_' . $field['id'], '0');
}
}
}
}
new bulk_meta_box;
}