为自定义发布元更改触发“未保存的更改”对话框

我正在使用带有自定义元字段的自定义帖子类型，但这些自定义元字段似乎不会触发自动保存和“未保存的更改”对话框。对我来说，自动保存不如“未保存的更改”对话框重要-有没有办法触发它？

function add_meta_boxes() {
    add_meta_box(\'places_location\', __(\'Location\'), array(&$this, \'location_box\'), \'place\', \'normal\', \'high\');
}

function location_box($post) {
    wp_nonce_field(plugin_basename(__FILE__), \'places_location_nonce\');

    $lat = get_post_meta($post->ID, \'places_lat\', true);
    $lng = get_post_meta($post->ID, \'places_lng\', true);

    ?>
    <p>
        <label>
            Latitude:
            <input name="places_lat" value="<?php echo esc_attr($lat); ?>" />
        </label>
        <label>
            Longitude:
            <input name="places_lng" value="<?php echo esc_attr($lng); ?>" />
        </label>
    </p>
    <?php
}

function save_place($id) {
    // skip unverified location nonces
    if(!wp_verify_nonce($_POST[\'places_location_nonce\'], plugin_basename(__FILE__))) return;

    // skip autosave calls
    // commenting this out still doesn\'t trigger saving these fields on autosave
    //if(defined(\'DOING_AUTOSAVE\') && DOING_AUTOSAVE) return;

    // update our custom post meta
    update_post_meta($id, \'places_lat\', (float)$_POST[\'places_lat\']);
    update_post_meta($id, \'places_lng\', (float)$_POST[\'places_lng\']);
}

window.onbeforeunload = function(){ var mce = typeof(tinyMCE) != \'undefined\' ? tinyMCE.activeEditor : false, title, content; if ( mce && !mce.isHidden() ) { if ( mce.isDirty() ) return autosaveL10n.saveAlert; } else { title = $(\'#post #title\').val(), content = $(\'#post #content\').val(); if ( ( title || content ) && title + content != autosaveLast ) return autosaveL10n.saveAlert; } };

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