Custom field in media library not saving, selected() function not adding "selected" to select list input type

Question

Custom field in media library not saving, selected() function not adding "selected" to select list input type

AlexP

2020年7月10日 03:37

Following the approach in the developer docs for selected() but can't get it to work with a custom field in the media library for a select list.

It won't save the value, or become selected. Looks like WP is doing some js/ajax in the background here, so do I need to approach this differently or have a dumb typo?

Please see code below, help is appreciated.

/*
Add license field to media attachments 
*/

    function add_custom_field_license( $form_fields, $post ) {
        $license_field = get_post_meta($post-ID, 'license_field');
        $form_fields['license_field'] = [
            'label' = 'License',
            'input' = 'html',
            'html' = select name='attachments[{$post-ID}][license_field]' id='attachments-{$post-ID}-license_field' 
        option value='none'  . selected($license_field, none) . None (all rights reserved)/option
        option value='CC0'  . selected($license_field, CC0) . CC0/option
        option value='CC BY'  . selected($license_field, CC BY) . CC BY/option
        /select,
        ];
        return $form_fields;
    }
    add_filter('attachment_fields_to_edit', 'add_custom_field_license', null, 2); 



/*
Save license field to media attachments
*/
function save_custom_field_license($post, $attachment) {  
    if( isset($attachment['license_field']) ){  
        update_post_meta($post['ID'], 'license_field', sanitize_text_field( $attachment['license_field'] ) );  
    }else{
         delete_post_meta($post['ID'], 'license_field' );
    }
    return $post;  
}
add_filter('attachment_fields_to_save', 'save_custom_field_licenser', null, 2);

Topic attachment-fields-to-edit media-library attachments custom-field Wordpress

Category Web

AlexP · Accepted Answer · 2020年7月10日 03:37

As per outlined in the comments, by fixing a typo in my save function, and setting the third parameter in get_post_meta() to true, and false in selected() it worked liked a charm. Thanks everyone!

Here's the working code in case anyone is trying to add a select list custom field to their media manager:

   /*
    Add license field to media attachments 
    */
    
    function add_custom_field_license( $form_fields, $post ) {
        $license_field = get_post_meta($post->ID, 'license_field', true);
        $form_fields['license_field'] = [
            'label' => 'License',
            'input' => 'html',
            'html' => "<select name='attachments[{$post->ID}][license_field]' id='attachments-{$post->ID}-license_field'> 
        <option value='none' " . selected($license_field, "none", false) . ">None (all rights reserved)</option>
        <option value='CC0' " . selected($license_field, "CC0", false) . ">CC0</option>
        <option value='CC BY' " . selected($license_field, "CC BY", false) . ">CC BY</option>
        <option value='CC BY-NC' " . selected($license_field, "CC BY-NC", false) . ">CC BY-NC</option>
        <option value='CC BY-SA' " . selected($license_field, "CC BY-SA", false) . ">CC BY-SA</option>
        <option value='CC BY-NC-ND' " . selected($license_field, "CC BY-NC-ND", false) . ">CC BY-NC-ND</option>
        </select>",
        ];
        return $form_fields;
    }
    add_filter('attachment_fields_to_edit', 'add_custom_field_license', null, 2); 
     
    /*
    Save license field to media attachments
    */

    function save_custom_field_license($post, $attachment) {  
        if( isset($attachment['license_field']) ){  
            update_post_meta($post['ID'], 'license_field', sanitize_text_field( $attachment['license_field'] ) );  
        }else{
             delete_post_meta($post['ID'], 'license_field' );
        }
        return $post;  
    }
    add_filter('attachment_fields_to_save', 'save_custom_field_license', null, 2);

Custom field in media library not saving, selected() function not adding "selected" to select list input type

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