Displaying Featured Image in Admin Columns

This topic has 4 replies, 3 voices, and was last updated 2 months, 1 week ago by dwcouch.

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September 22, 2019 at 7:16 AM #16225

Resolved John Anderson
Participant

Hi guys,
I have followed along with some custom code I found in this forum trying to display the featured_image in the admin columns before the Title. But it breaks my site.

I don't have a theme, so I don't use functions.php. Instead I use Code Snippets to add custom PHP.

Is there some code somewhere that provides a working example of how to display the featured image in the Admin Columns?

Thanks for your time.

John Anderson.
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September 23, 2019 at 5:07 PM #16241

Anh Tran

Keymaster

Hi John,

Please try this snippet:

add_action( 'admin_init', function() {
    class My_Featured_Image_Columns extends MB_Admin_Columns_Post {
        public function columns( $columns ) {
            $columns  = parent::columns( $columns );
            $position = 'before';
            $target   = 'title';
            $this->add( $columns, 'featured_image', 'Featured Image', $position, $target );
            // Add more if you want
            return $columns;
        }
        public function show( $column, $post_id ) {
            switch ( $column ) {
                case 'featured_image':
                    the_post_thumbnail( [40, 40] );
                    break;
                // More columns
            }
        }
    }

    new My_Featured_Image_Columns( 'post', array() );
} );

September 24, 2019 at 4:23 AM #16250

John Anderson

Participant

Oh! I love you!!! lol.

And you updated the documentation for Admin Columns with this example! Now I just change the 'post' slug to what ever slug my CPT is and it will display the featured image in the admin columns.

Thank you!

Just one last question.

new My_Featured_Image_Columns( 'post', array() );
when I instantiate the class, how would I do so for more than 1 CPT? I tried this but it didn't work.

new My_Featured_Image_Columns( array('team-member','challenge'), array() );

So I am guessing that 2 instantiations are necessary.

new My_Featured_Image_Columns( 'team-member', array() );
new My_Featured_Image_Columns( 'challenge', array() );

Thank you,
John.

September 24, 2019 at 10:54 AM #16257

Anh Tran

Keymaster

Hi John,

You're right about 2 instantiations. Because the class is designed for single post type, we can't pass an array to its constructor. Initializing it twice for different post types does the job.

April 23, 2022 at 7:52 PM #35771

dwcouch

Participant

Hello - Thank you, as always, for the great help and documentation.
I attempted to use this function for adding the featured image to a CPT added via MetaBox.
The column simply does not show if I add any value to $position =
~David

MetaBox (Version 5.6.3)
MB Admin Columns (Version 1.6.0)

/* Add Featured Images to Admin Columns 
 * https://docs.metabox.io/extensions/mb-admin-columns/
 */
add_action( 'admin_init', 'prefix_add_custom_columns', 20 );
function prefix_add_custom_columns() {
    class Prefix_Custom_Admin_Columns extends \MBAC\Post {
        public function columns( $columns ) {
            $columns  = parent::columns( $columns );
            $position = '';
            $target   = '';
            $this->add( $columns, 'featured_image', 'Logo', $position, $target );
            // Add more if you want
            return $columns;
        }
        public function show( $column, $post_id ) {
            switch ( $column ) {
                case 'featured_image':
                    the_post_thumbnail( [40, 40] );
                    break;
                // More columns
            }
        }
    }
    new Prefix_Custom_Admin_Columns( 'partner', array() );
}

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