Add column to pages table

Question

Hey all i am trying to find the section within the edit.php page where it populates the table with all my current pages. What i want to do is add another colum to the table in order to launch a side page for changing a picture.

Could anyone point me to the code that populates the table?

Thanks!

David

Answer 1

Also an tutorial with an solution for page and post to add thumbnail in a column: http://wpengineer.com/1960/display-post-thumbnail-post-page-overview/ Change the content from thumbnail to your content and remove the hooks for post:

// for posts
// add_filter( 'manage_posts_columns', 'fb_AddThumbColumn' );
// add_action( 'manage_posts_custom_column', 'fb_AddThumbValue', 10, 2 );
// for pages
add_filter( 'manage_pages_columns', 'fb_AddThumbColumn' );
add_action( 'manage_pages_custom_column', 'fb_AddThumbValue', 10, 2 );

the id of page in backend is in the hook and you can add on all tables in backend new columns, also an example for Multisite Table: http://wpengineer.com/2188/view-blog-id-in-wordpress-multisite/

    add_action( 'manage_sites_custom_column', array( $this, 'add_columns' ), 10, 2 );
    add_action( 'manage_blogs_custom_column', array( $this, 'add_columns' ), 10, 2 );

Answer 2

Here is how i did it:

/****** Add Thumbnails in Manage Posts/Pages List ******/
if ( !function_exists('AddThumbColumn') && function_exists('add_theme_support') ) {
    // for post and page
    add_theme_support('post-thumbnails', array( 'post', 'page' ) );
    function AddThumbColumn($cols) {
        $cols['thumbnail'] = __('Thumbnail');
        return $cols;
    }
    function AddThumbValue($column_name, $post_id) {
            $width = (int) 60;
            $height = (int) 60;
            if ( 'thumbnail' == $column_name ) {
                // thumbnail of WP 2.9
                $thumbnail_id = get_post_meta( $post_id, '_thumbnail_id', true );
                // image from gallery
                $attachments = get_children( array('post_parent' => $post_id, 'post_type' => 'attachment', 'post_mime_type' => 'image') );
                if ($thumbnail_id)
                    $thumb = wp_get_attachment_image( $thumbnail_id, array($width, $height), true );
                elseif ($attachments) {
                    foreach ( $attachments as $attachment_id => $attachment ) {
                        $thumb = wp_get_attachment_image( $attachment_id, array($width, $height), true );
                    }
                }
                    if ( isset($thumb) && $thumb ) {
                        echo $thumb;
                    } else {
                        echo __('None');
                    }
            }
    }
    // for posts
    add_filter( 'manage_posts_columns', 'AddThumbColumn' );
    add_action( 'manage_posts_custom_column', 'AddThumbValue', 10, 2 );
    // for pages
    add_filter( 'manage_pages_columns', 'AddThumbColumn' );
    add_action( 'manage_pages_custom_column', 'AddThumbValue', 10, 2 );
}

And the code above was taken from this page: http://wpmu.org/how-to-add-post-thumbnails-to-the-wordpress-post-and-page-management-screens/