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I have this issue where I need a CPT to have several layout options and use templates. Originally, WP does not support templates for custom posts, however I know its possible to do it manually via Meta boxes custom data.

This is the snippet of code I have in my functions, which enables possibility to choose template and save it. It works fine - adds data to db and saves/updates the template. My issue is in the last part, where I try to redirect the theme to correct template and some-why it does not work.

 // --------Add actions
 add_action('add_meta_boxes', 'custom_template_add_custom_box');

 /* Do something with the data entered */
 add_action('save_post', 'custom_template_save_postdata');


 // --------Add functions
 /* Adds a box to the main column on the Post and Page edit screens */
 function custom_template_add_custom_box() {
     add_meta_box( 'custom-post-type-choice', 'Choose custom template', 'custom_template_inner_box', 'campaign', 'side' );
 }

 /* Prints the box content */
 function custom_template_inner_box( $post ) {

     // Use nonce for verification
     wp_nonce_field( plugin_basename(__FILE__), 'custom_template_noncename' );

     if ( 0 != count( get_page_templates() ) ) {
         $page_template = get_post_meta($post->ID, '_wp_page_template', TRUE); ?>
     <p><strong><?php _e('Template') ?></strong></p>
     <label class="screen-reader-text" for="page_template"><?php _e('Page Template') ?></label>
     <select name="page_template" id="page_template">
         <option value='default'><?php _e('Default Template'); ?></option>
         <?php page_template_dropdown($page_template); ?>
     </select>
 <?php }
 }

 /* When the post is saved, saves our custom data */
 function custom_template_save_postdata( $post_id ) {

     // verify this came from the our screen and with proper authorization,
     // because save_post can be triggered at other times

     if ( !isset( $_POST['custom_template_noncename'] ) || !wp_verify_nonce( $_POST['custom_template_noncename'], plugin_basename(__FILE__) ) )
         return $post_id;

     // verify if this is an auto save routine. 
     // If it is our form has not been submitted, so we dont want to do anything
     if ( defined('DOING_AUTOSAVE') && DOING_AUTOSAVE ) 
         return $post_id;


     // Check permissions
     if ( 'page' == $_POST['post_type'] ) {
         if ( !current_user_can( 'edit_page', $post_id ) )
             return $post_id;
         }
     else {
         if ( !current_user_can( 'edit_post', $post_id ) )
             return $post_id;
     }

     // OK, we're authenticated: we need to find and save the data

     $page_template = $_POST['page_template'];

     if ( !empty($page_template) && 'campaign' == get_post_type($post_id) ) {
         $page_templates = get_page_templates();
         if ( 'default' != $page_template && !in_array($page_template, $page_templates) ) {
             if ( $wp_error )
                 return new WP_Error('invalid_page_template', __('The page template is invalid.'));
             else
                 return 0;
         }
         update_post_meta($post_id, '_wp_page_template',  $page_template);
     }
 }

 /* Custom template redirection hook */

 function custom_template_redirect() {
     global $post;

     if ( is_single() && 'campaign' == get_post_type($post) ) {
         $page_template = get_page_template();
         include($page_template);
         exit;
     }
 }
 add_action("template_redirect", 'custom_template_redirect');

So how can I 'use' the selected template for that page?

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I'd recommend using the template_include filter as opposed to template_redirect, as using this hook means that you don't redirect the user but rather just present them with the template that is requierd.

add_filter('template_include', 'my_custom_template_redirect', 99);
function my_custom_template_redirect($template){

    global $post;

    if(is_single() && 'campaign' == get_post_type($post)){
        $page_template = get_page_template();
        $new_template = locate_template( array( 'subfolder/' . $page_template . '.php' ) );
        $template = ($new_template !== '') ? $new_template : $template;
    }

    return $template;

}

Ovbiously I'm making the assumption that your $page_template variable doesn't have .php on the end, but you can ammend that as required.

I'd recommend you have a read of the documentation related to this hook, and the locate_template function -

Update

In my original answer I forgot to include global $post;. I've now amended the answer to include this line.

  • Weird. Seems like good code, and used exactly as codex suggested, however now I get error "undefined variable: post" .. thoughts? – nerijusgood Jan 23 '15 at 14:15
  • Add global $post to the top of the function. I'll update the answer momentarily. – David Gard Jan 23 '15 at 14:55
  • Out of interest, do you have debugging enabled via wp-config.php? I didn't think you'd be noticied of an undefined variable by default. – David Gard Jan 23 '15 at 14:55
  • Well, this does not work, as well my file-name is not template name and its located in sub-folder, so applying name of template to php would not even make sense. I declare template within the php file: /* Template Name: name-of-template */ Anyway, this code gives me white page for any page ;/ – nerijusgood Jan 26 '15 at 8:38
  • The white page error should now be corrected, but you are correct that if you place the template in a subfolder that it will not be found. However, could you not simply add the name of the subfolder to the template string? So locate_template( array( 'subfolder/' . $page_template . '.php' ) ), obviously replacing subfolder with the correct folder name. Personally I would recommend putting templates directly into the theme folder though - it's just easier. – David Gard Jan 26 '15 at 9:35

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