Ajax实现列表无限加载和二级下拉选项效果

//栏目Ajax做加载
public function ajaxlist(){
 //echo "http://www.域名.com/index.php?a=Index&c=Index&m=ajaxlist";
 //echo "<hr>";
 $data = Q(&#39;sum&#39;);
 $where = array();
 $where[&#39;cid&#39;] = 33;
 $rongyuList = M(&#39;content&#39;)->limit($data,2)->where($where)->select();
 $data[&#39;stat&#39;] = 1;
 $data = $rongyuList;
 $this->ajax($data);
 //也可以手动把想要的字段拼接成字符串 
 /*echo "[";
 foreach($rongyuList as $k){
  echo "{"."\""."title"."\"".":"."\"".$k[&#39;title&#39;]."\"".","."\""."description"."\"".":"."\"".$k[&#39;description&#39;]."\"".","."\""."cid"."\"".":"."\"".$k[&#39;cid&#39;]."\""."}".",";  
 }
 echo "]";*/
 }

<script type=&#39;text/javascript&#39;>
/*ajax*/
(function(){
//发送数据 
var url = "__WEB__"+"?a=Index&c=Index&m=ajaxlist";
var oSum = &#39;&#39;; 
$(&#39;a.ajaxBut&#39;).click(function(){
 oSum = $(&#39;p.zizhiListContBox>a&#39;).size();
 $.post(url,{sum:oSum},function(result){
 console.log(result);
 eval("var info="+result);
 for(var key in info){
   oStr = "<a href=&#39;"+"__WEB__"+"?a=Index&c=Index&m=content&mid=1&cid=33&aid="+info[key][&#39;aid&#39;]+""+"&#39;><h3 class=&#39;f100 f16 ts500&#39;>"+info[key][&#39;title&#39;]+"</h3><p>"+info[key][&#39;description&#39;]+"</p><span class=&#39;b parb&#39;></span></a>";
   $(&#39;p.zizhiListContBox&#39;).append(oStr);
 };
 });
});
})();
</script>

<!-- 示例：HTML -->
<dl class="pr keshi" >
 <dt class="pa">科室：</dt>
 <dd class="pa">
  <select name=&#39;keshi&#39; class=&#39;m_keshi&#39;>
   <option value=&#39;0&#39;>--请选择科室--</option>
  </select>
  <select name=&#39;zhuanjia&#39; class=&#39;m_zhuanjia&#39;>
   <option>--请选择专家--</option>
  </select>
 </dd>
</dl>

//示例控制器
/* Ajax请求栏目列表 */
public function ajaxlanmu(){
 $lanmuList = M('category')->where('pid=142')->select();
 $this->ajax($lanmuList);
}
public function ajaxzhuanjia(){
 $where = array();
 $data = Q('sum');
 $data = $data ? $data : 143;
 $where['cid'] = $data;
 $zhuanjiaList = M('guahao')->where($where)->select();
 $this->ajax($zhuanjiaList);
}

<script>
(function(){
var lanmuUrl = "__WEB__"+"?a=Index&c=Index&m=ajaxlanmu";
var zhuanjiaUrl = "__WEB__"+"?a=Index&c=Index&m=ajaxzhuanjia";
var oSum = oStr = oStr2 = oVal = oKong = info2 = oCid = &#39;&#39;;
/* lanmu */
$.post(lanmuUrl,function(result){
 eval("var info="+result);
 for(var key in info){oStr += "<option value=&#39;"+info[key][&#39;catname&#39;]+"&#39; cid=&#39;"+info[key][&#39;cid&#39;]+"&#39;>"+info[key][&#39;catname&#39;]+"</option>";};
 $(&#39;dl.keshi&#39;).find(&#39;select.m_keshi&#39;).append(oStr);
});
/* zhuanjia */
$(&#39;dl.keshi&#39;).find(&#39;select.m_keshi&#39;).change(function(){
 oVal = $(this).find(&#39;option:selected&#39;).val();
 if(oVal == 0){
  $(&#39;dl.zhuanjia&#39;).find(&#39;select.m_zhuanjia&#39;).html("<option>--请选择专家--</option>");
 }else{
  oCid = $(this).find(&#39;option:selected&#39;).attr(&#39;cid&#39;);
  $.post(zhuanjiaUrl,{sum:oCid},function(result){
   eval("info2="+result);
   oStr2 = &#39;&#39;;//注意这里要清空第一次请求的数据
   for(var key2 in info2){
    oStr2 += "<option value=&#39;"+info2[key2][&#39;title&#39;]+"&#39;>"+info2[key2][&#39;title&#39;]+"</option>";    
   };
   $(&#39;dl.zhuanjia&#39;).find(&#39;select.m_zhuanjia&#39;).html(oStr2);
  });
 };
});
})();
</script>