Add page template from plugin to page
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So I’ve copied some code I found on how to create a template file via a plugin and how to create a page when the plugin is activated.
However, I can’t get the plugin created page to use the template my plugin created.
First I have this code in the plugins index file.
It seems to work since I can manually set the template whenever I edit a page.class PageTemplater { /** * A reference to an instance of this class. */ private static $instance; /** * The array of templates that this plugin tracks. */ protected $templates; /** * Returns an instance of this class. */ public static function get_instance() { if( null == self::$instance ) { self::$instance = new PageTemplater(); } return self::$instance; } /** * Initializes the plugin by setting filters and administration functions. */ private function __construct() { $this->templates = array(); // Add a filter to the attributes metabox to inject template into the cache. add_filter( 'page_attributes_dropdown_pages_args', array( $this, 'register_project_templates' ) ); // Add a filter to the save post to inject out template into the page cache add_filter( 'wp_insert_post_data', array( $this, 'register_project_templates' ) ); // Add a filter to the template include to determine if the page has our // template assigned and return it's path add_filter( 'template_include', array( $this, 'view_project_template') ); // Add your templates to this array. $this->templates = array( 'page-categories.php' => 'Categories page', ); } /** * Adds our template to the pages cache in order to trick WordPress * into thinking the template file exists where it doens't really exist. * */ public function register_project_templates( $atts ) { // Create the key used for the themes cache $cache_key = 'page_templates-' . md5( get_theme_root() . '/' . get_stylesheet() ); // Retrieve the cache list. // If it doesn't exist, or it's empty prepare an array $templates = wp_get_theme()->get_page_templates(); if ( empty( $templates ) ) { $templates = array(); } // New cache, therefore remove the old one wp_cache_delete( $cache_key , 'themes'); // Now add our template to the list of templates by merging our templates // with the existing templates array from the cache. $templates = array_merge( $templates, $this->templates ); // Add the modified cache to allow WordPress to pick it up for listing // available templates wp_cache_add( $cache_key, $templates, 'themes', 1800 ); return $atts; } /** * Checks if the template is assigned to the page */ public function view_project_template( $template ) { global $post; if (!isset($this->templates[get_post_meta( $post->ID, '_wp_page_template', true )] ) ) { return $template; } $file = plugin_dir_path(__FILE__). get_post_meta( $post->ID, '_wp_page_template', true ); // Just to be safe, we check if the file exist first if( file_exists( $file ) ) { return $file; } else { echo $file; } return $template; } } add_action( 'plugins_loaded', array( 'PageTemplater', 'get_instance' ) );
Then I have this part that creates the page.
The template file is in the same folder as the plugin and is called page-categories.phpregister_activation_hook( __FILE__, 'myplugin_activate' ); function myplugin_activate() { $post = array( 'post_content' => 'Content' , 'post_title' => 'Categories' , 'post_status' => 'publish' , 'post_type' => 'page' , 'page_template' => 'page-categories.php' ); wp_insert_post( $post ); }
Sorry if this super simple and I’m hella dumb.
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