OctoberCMS：觸發事件不起作用

看完這個（和其他人......）對文檔的文章（link）我找不到從我身邊的一個問題...OctoberCMS：觸發事件不起作用

我不能把扳機事件的工作......因此，這裏是我的代碼：

//fields.yaml

fields: 
    gallery: 
     label: Galeria 
     span: full 
     oc.commentPosition: '' 
     prompt: 'Add new item' 
     type: repeater 
     form: 
      fields: 
       type: 
        label: 'Select the type of a gallery item' 
        span: full 
        type: galleryplusvideoselect 
       galleryplusvideo: 
        label: Gallery 
        span: full 
        oc.commentPosition: '' 
        type: galleryplusvideo 
        hidden: true 
        trigger: 
         action: show 
         field: type 
         condition: value[image]

// galleryplusvideoselect _widget.htm文件

<div data-control="balloon-selector" class="control-balloon-selector"> 
    <ul> 
     <li data-value="image" <?php if($type == "image") echo 'class="active"'; ?>>Image</li> 
     <li data-value="video" <?php if($type == "video") echo 'class="active"'; ?>>Video</li> 
    </ul> 

    <input type="text" onkeyup=" 
      $(this).trigger('change')" <!-- <--- THIS IS ONLY TO REPRODUCE AN EXAMPLE FROM THE DOCUMENTATION --> 
    name="<?=$name ?>" value="<?= $type ?>" /> 
</div>