1.效果展示

---

系统crud生成的下拉分类有些不是很好看，并且选择困难，看不出级差，效果如下：

 经过 build_select 加工后的效果,美观好看，并添加上搜索功能:

2. 首先需要写一个树状图的数据格式

---

protected $datalist = [];
public function _initialize()
{
    parent::_initialize();

    // 必须将结果集转换为数组
    $dataList = collection(Category::order('weigh', 'desc')->where('status', 'normal')->select())->toArray();
    foreach ($dataList as $k => &$v) {
        $v['name'] = __($v['name']);
    }
    unset($v);
    Tree::instance()->init($dataList);
    $this->dataList = Tree::instance()->getTreeList(Tree::instance()->getTreeArray(0), 'name');
    $data = [0 => __('None')];
    foreach ($this->dataList as $k => &$v) {
        $data[$v['id']] = $v['name'];
    }
    $this->view->assign('data', $data);
}

3.add和edit的html页面

// add
<div class="form-group">
    <label class="control-label col-xs-12 col-sm-2">{:__('Category')}:</label>
    <div class="col-xs-12 col-sm-8">
        {:build_select('row[category_id]', $data, null, ['class'=>'form-control selectpicker', 'required'=>'', 'data-live-search'=>"true"])}
    </div>
</div>

// edit
<div class="form-group">
    <label class="control-label col-xs-12 col-sm-2">{:__('Category')}:</label>
    <div class="col-xs-12 col-sm-8">
        {:build_select('row[category_id]', $data, $row['category_id'], ['class'=>'form-control selectpicker', 'required'=>'', 'data-live-search'=>"true"])}
    </div>
</div>