Multiselect feature on attachment_fields_to_edit

[drosendo]

Dont know if is bug or not.

When using:

<?php

add_filter('attachment_fields_to_edit', array($this, 'multi_field'), 10, 2);
add_filter('attachment_fields_to_save', array($this, 'multi_field_save'), 10, 2);

function multi_field($form_fields, $post) {
    $current = "something";
    $html = "<select name='attachments[{$post->ID}][multi_field]' id='attachments[{$post->ID}][multi_field]' multiple='multiple'>";
    $html .= "<option value='' " . selected($current, '', false) . ">none</option>";
    $html .= "<option value='a' " . selected($current, $something, false) . ">a</option>";
    $html .= "<option value='b' " . selected($current, $something, false) . ">b</option>";
    $html .= "<option value='c' " . selected($current, $something, false) . ">c</option>";
    $html .= "<option value='d' " . selected($current, $something, false) . ">d</option>";
    $html .= '</select>';

    $form_fields['woosvi-slug'] = array(
        'label' => 'Variation',
        'input' => 'html',
        'html' => $html,
        'application' => 'image',
        'exclusions' => array(
            'audio',
            'video'
        )
    );

    return $form_fields;
}

function multi_field_save($post, $attachment) {

    if (isset($attachment['multi_field']))
        update_post_meta($post['ID'], 'multi_field', $attachment['multi_field']);


    return $post;
}

Each time the select option is done, it runs ajax and saves the last value and not multiple values.
May be im missing somehting to allow this to work properly.

thanks,
David

[ocean90]

Hello @drosendo, welcome to the WordPress Trac!

Thanks for your valid report, we're already tracking this issue in #28053.