How do I create a new page with the plugin I’m building

(Sorry, here is the properly formatted code – wouldn’t a POST preview function be great?!)

By the way: once my plugin page is flagged in the $wp_query object, I then use the ‘the_posts’ filter to see if $wp_query->get(‘my_plugin_page_is_called’) is set. I can then override:
$posts[0]->post_title and $posts[0]->post_content with my own content.

function my_plugin_query_parser( $q ) {

$the_page_name = get_option( "my_plugin_page_name" );
$the_page_id = get_option( 'my_plugin_page_id' );

$qv = $q->query_vars;

// have we NOT used permalinks...?
if( !$q->did_permalink AND ( isset( $q->query_vars['page_id'] ) ) AND ( intval($q->query_vars['page_id']) == $the_page_id ) ) {

$q->set('my_plugin_page_is_called', TRUE );
return $q;

}
elseif( isset( $q->query_vars['pagename'] ) AND ( ($q->query_vars['pagename'] == $the_page_name) OR ($_pos_found = strpos($q->query_vars['pagename'],$the_page_name.'/') === 0) ) ) {

$q->set('my_plugin_page_is_called', TRUE );
return $q;

}
else {

$q->set('my_plugin_page_is_called', FALSE );
return $q;

}

}
add_filter( 'parse_query', 'my_plugin_query_parser' );

It all works fine, but I am also wondering if this is the ‘correct’ way of doing things.

Francis.

@andym4e: Sorry – didn’t see your post until now.

I came across a funny thing where $q->did_permalink was not being set when they were actually in use. I don’t know if it is a bug or a ‘feature’ – I didn’t have time to investigate.

Here’s what I do now:

function my_plugin_page_filter( $posts ) {

global $wp_query;

if( $wp_query->get('my_plugin_page_is_called') ) {

$posts[0]->post_title = 'The Page Title';
$posts[0]->post_content = 'The page contents.';

}

return $posts;

}
add_filter( 'the_posts', 'my_plugin_page_filter' );

@mtarvainen

Thanks.

I can’t think of a way to prevent the page from appearing.

In fairness you don’t need a page. I did this so my page would appear in the WordPress menu system. You could sniff out the request and create a blank post with your own content and title.

I also had a comment from R’phael Spindel suggesting I look at WP_Rewrite. That could accomplish the same thing.

Hi there,

I used this topic for creating my own plugin. Everything works so far, but when i go to the main page on my sandbox.. i see the hello world post. When i click on it, i am in the ‘hello world’ post, but the title and the content has been replaced by the plugin page post.

If you download this code and put it as memberlist.php in your plugin folder of your sandbox you will see what i mean.

This is really weird. This is the code, i know it is not documented very well, but the class name says enough. I want to create a ‘memberlist’ page where i output all the members in a (paged) list. I start documenting the class when everything works.

<?php
/*
Plugin Name: Mallona Memberlist
Description: ~
Version: 1.0
Author: Dominique de Graaff
Author URI: mailto:d.degraaff@mallona.nl
*/
if (!class_exists('Memberlist_Plugin'))
{
  class Memberlist_Plugin
  {
    public $_name;
    public $page_title;
    public $page_name;
    public $page_id;

    public function __construct()
    {
      $this->_name      = 'memberlist';
      $this->page_title = 'Memberlist';
      $this->page_name  = $this->_name;
      $this->page_id    = '0';

      register_activation_hook(__FILE__, array($this, 'activate'));
      register_deactivation_hook(__FILE__, array($this, 'deactivate'));
      register_uninstall_hook(__FILE__, array($this, 'uninstall'));

      add_filter('parse_query', array($this, 'query_parser'));
      add_filter('the_posts', array($this, 'page_filter'));
    }

    public function activate()
    {
      global $wpdb;      

      delete_option($this->_name.'_page_title');
      add_option($this->_name.'_page_title', $this->page_title, '', 'yes');

      delete_option($this->_name.'_page_name');
      add_option($this->_name.'_page_name', $this->page_name, '', 'yes');

      delete_option($this->_name.'_page_id');
      add_option($this->_name.'_page_id', $this->page_id, '', 'yes');

      $the_page = get_page_by_title($this->page_title);

      if (!$the_page)
      {
        // Create post object
        $_p = array();
        $_p['post_title']     = $this->page_title;
        $_p['post_content']   = "This text may be overridden by the plugin. You shouldn't edit it.";
        $_p['post_status']    = 'publish';
        $_p['post_type']      = 'page';
        $_p['comment_status'] = 'closed';
        $_p['ping_status']    = 'closed';
        $_p['post_category'] = array(1); // the default 'Uncatrgorised'

        // Insert the post into the database
        $this->page_id = wp_insert_post($_p);
      }
      else
      {
        // the plugin may have been previously active and the page may just be trashed...
        $this->page_id = $the_page->ID;

        //make sure the page is not trashed...
        $the_page->post_status = 'publish';
        $this->page_id = wp_update_post($the_page);
      }

      delete_option($this->_name.'_page_id');
      add_option($this->_name.'_page_id', $this->page_id);
    }

    public function deactivate()
    {
      $this->deletePage();
      $this->deleteOptions();
    }

    public function uninstall()
    {
      $this->deletePage(true);
      $this->deleteOptions();
    }

    public function query_parser($q)
    {
      if(isset($q->query_vars['page_id']) AND (intval($q->query_vars['page_id']) == $this->page_id ))
      {
        $q->set($this->_name.'_page_is_called', true);
      }
      elseif(isset($q->query_vars['pagename']) AND (($q->query_vars['pagename'] == $this->page_name) OR ($_pos_found = strpos($q->query_vars['pagename'],$this->page_name.'/') === 0)))
      {
        $q->set($this->_name.'_page_is_called', true);
      }
      else
      {
        $q->set($this->_name.'_page_is_called', false);
      }
    }

    function page_filter($posts)
    {
      global $wp_query;

      if($wp_query->get($this->_name.'_page_is_called'))
      {
        $posts[0]->post_title = __('Memberlist');
        $posts[0]->post_content = 'The contents';
      }
      return $posts;
    }

    private function deletePage($hard = false)
    {
      global $wpdb;

      $id = get_option($this->_name.'_page_id');
      if($id && $hard == true)
        wp_delete_post($id, true);
      elseif($id && $hard == false)
        wp_delete_post($id);
    }

    private function deleteOptions()
    {
      delete_option($this->_name.'_page_title');
      delete_option($this->_name.'_page_name');
      delete_option($this->_name.'_page_id');
    }
  }
}
$memberlist = new Memberlist_Plugin();
?>

And what do you guys mean by ‘not’ using a page, but just a blank post. Do you have a little example for me that explains this?

By the way, i’m on 3.0 now (if that does matter)

Thanks!