ThinkPHP采用<volist>实现三级循环代码实例

本文以实例描述了ThinkPHP采用标签实现三级循环代码，具体操作步骤如下：

1. 三级循环需要三维数组，实现代码如下：

    function MakeTree($pid,$level) { 
     $map['pid'] = $pid; 
    $map['level'] = $level; 
    $result = $this->where($map)->order('rank ASC')->findall(); 
    if($result){ 
     foreach ($result as $key => $value){ 
     $title = $value['alias']; 
     $list[$title]['id'] = $value['id']; 
     $list[$title]['pid'] = $value['pid']; 
     $list[$title]['alias']= $value['alias']; 
     $list[$title]['title'] = $value['title']; 
     $list[$title]['level'] = $value['level']; 
     $list[$title]['state'] = $value['state']; 
     $list[$title]['rank'] = $value['rank']; 
     if($value['level']<=3){ 
      $list[$title]['child'] = $this->_MakeSonTree($value['id']);
     } 
     } 
    } 
    return $list; 
    } 

    function _MakeSonTree($pid) { 
    $map['pid'] = $pid; 
    $result = $this->where($map)->order('rank ASC')->findall(); 
    if($result){ 
     foreach ($result as $key => $value){ 
     $title = $value['alias']; 
     $list[$title]['id']= $value['id']; 
     $list[$title]['pid']= $value['pid']; 
     $list[$title]['alias']= $value['alias']; 
     $list[$title]['title'] = $value['title']; 
     $list[$title]['level'] = $value['level']; 
     $list[$title]['state'] = $value['state']; 
     $list[$title]['rank'] = $value['rank']; 
      if($this->haschild($value['id'])){  //先判断是否有第三级子类,最后的数组形如$result['child']['grandchild']; 
      $list[$title]['grandchild']=$this->_MakeSonTree($value['id']); 
      } 
     } 
    } 
    return $list; 
     } 

    function haschild($id){ 
    $result=D('LearningChannel')->where("pid=".$id)->find(); 
    if($result){ 
     return true; 
     } 
     else return false; 
    }

2.绑定volist标签：

     $result=D('Learning') ->MakeTree(0,1); 
     //dump($result);
     $this->assign('list',$result);

3.模板部分：

    <select name="category" id="select" class="text mr5"> 
     <volist name="list" id="vo"> 
      <option name="cid" value="{$vo.id}" <eq name="vo.id" value="getid">selected</eq> >{$vo.alias}</option>  
     <volist name="vo['child']" id="child"> 
      <option name="cid" value="{$child.id}" <eq name="child.id" value="getid">selected</eq> >--{$child.alias}</option>  
      <volist name="child['grandchild']" id="grand"> 
      <option name="cid" value="{$grand.id}" <eq name="grand.id" value="getid">selected</eq> >---{$grand.alias}</option>  
      </volist> 
     </volist> 
     </volist> 
     </select>