实现基于json的级联菜单

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 对于ajax应用来说，把和控件榜定的数据用json来承载，既可以避免频繁调用httprequest，也可以避免xml带来的性能解释。

假设我们要有一个级联菜单，显示用户组以及下面的用户，我们可以这样做

      $group_user = Array();   
      $groups = $db->getAll("select * from $dbutils->group");

      for ($i = 0, $count = count($groups); $i < $count; $i++) {
     
         $users = $db->getAll("select * from $dbutils->user_group ug,$dbutils->user u where ug.user_id = u.user_id and ug.group_id = ".$groups[$i]['group_id']);
         $group_user[$groups[$i]['group_id']]['users'] = $users;
      }

      $json = new JSON(JSON_LOOSE_TYPE);
      $group_user_json_data = $json->encode($group_user);  //将数据从php数组转换成javascript数组
     

     
      $group_user_javascript_data = '';

 

在模板表单里面

 echo $group_user_javascript_data;    //把json的数据显示出来
 

?>

 

function removeOptions(optionMenu)
{
  len = optionMenu.options.length;
  for (var i=len-1; i >=0 ; i--) {
  
    optionMenu.options[i] = null;

  }

}

 
function change_group() {

  var users = group_user_json_data[document.getElementById('receive_group').value]['users'];//从json里面得到对象

  addOptions(users, document.getElementById('receive_user'))

 
  
}

 

                                    

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