省份、市区、县级 等区域调用

思路：用ajax调取区域数据ajax($parendid,ID)    parendid 是父级I；  后面是需要给值“shiqu”，“quyu”

html代码

<select name="shengfen" id="shengfen" onchange="area(this.value,'shiqu')">
                  <option value="">请选择省份</option>
                {$vo['shengfen']}
              </select>
              <select name="shiqu" id="shiqu" onchange="area(this.value,'quyu')">
                  <option value="">请选择市</option>
              </select>
              <select name="quyu" id="quyu">
                  <option value="">请选择区域</option>
              </select>

js

function area(a,b){
    
    $.ajax({
        url:"{:U('Client/ajax_raea')}&parentid="+a,
        success:function(html){
            //alert(html);
            $("#"+b+"").html(html);        
        }    
    });
    
}