thinkPHP+mysql+ajax实现的仿百度一下即时搜索效果详解

?php
namespace Wechat\Controller;
use Think\Controller;
/**
 * 学校模块控制层
 */
class SchoolController extends Controller {
  //学校选择页面
  public function index(){
    $County = D("County");
    $School = D("School");
    //获取所有的省份列表
    $cityList = $County->where("pid = 0")->order("sort desc")->select();
    //遍历省份数据，获取二级城市列表
    foreach ($cityList as $key => $value) {
      $countyList[] = $County->where("pid = ".$value['id'])->order("sort desc")->select();
    }
    //如果url传过来省级编号，就保存，否则就默认山东为要显示的省份
    if(!empty($_GET['cityid'])){
      $cityid = $_GET['cityid'];
    }else{
      //6号代码山东的城市编号
      $cityid = 6;
    }
    //查询此省份编号中的所有城市
    $countyList = $County->where("pid = ".$cityid)->order("sort desc")->select();
    //查询城市中的所有学校
    foreach ($countyList as $key => $value) {
      $countyList[$key]['school'] = $School->where("cid = ".$value['id'])->select();
    }
    //给视图层赋值
    $this->assign("cityList",$cityList);
    $this->assign("countyList",$countyList);
    //显示视图层
    $this->display();
  }
  //根据关键字进行查找
  public function get_school_by_key(){
    $key = $_POST['key'];//获取关键字
    if(empty($key))
      $this->ajaxReturn(array("flag"=>0,"data"=>array())); //如果关键字为空，就返回空数组
    //查询学校
    $School = D("School");
    $where['name'] = array("like","%".$key."%");
    $schoolList = $School->where($where)->limit("6")->select();
    if(empty($schoolList))
      $this->ajaxReturn(array("flag"=>0,"data"=>array()));//如果数据为空，也返回空数组
    $this->ajaxReturn(array("flag"=>1,"data"=>$schoolList));//返回学校列表
  }
}

!DOCTYPE HTML>
html>
head>
meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no">
meta http-equiv="Content-Type" content="text/html; charset=utf-8">
link rel="stylesheet"  href="__PUBLIC__/Wechat/css/choose.css?20150819" rel="external nofollow" type="text/css">
script src="http://libs.baidu.com/jquery/2.0.0/jquery.min.js" type="text/javascript">/script>
title>选择所在学校/title>
/head>
body style="overflow:-Scroll;overflow-x:hidden">
div class="title"> 请选择您所在学校 /div>
div class="search-w">
 input class="search" type="text" name="k"  placeholder="快速搜索您所在的城市或学校" value="">
 !--需要动态显示的数据列表框-->
 ul class="list">
 /ul>
/div>
div class="wraper">
 div class="center">
  div class="left">
   ul>
    !--显示所有的省份-->
    foreach name="cityList" item="city">
      li id="box{$city.id}">a href="__APP__/School/index/cityid/{$city.id}" rel="external nofollow" >{$city.name}/a>/li>
    /foreach>
   /ul>
  /div>
  div class="right">
   !--显示所有城市 -->
   foreach name="countyList" item="county">
    ul>
    p>{$county.name}/p>
    !--显示城市里面的学校-->
    foreach name="county['school']" item="school">
      li>a href="__APP__/Dormitory/index/sid/{$school.sid}" rel="external nofollow" >{$school.name}/a>/li>
    /foreach>
    /ul>
   /foreach>
  /div>
 /div>
/div>
/body>
script>
$(function(){
 //响应键盘事件
 $('.search-w input[name="k"]').keyup(function(){
  //发送post请求，地址为控制器中的get_school_by_key方法,参数为输入的内容
  $.post('__APP__/School/get_school_by_key',{'key':$(this).val()},function(data){
      var data = eval('('+data+')');
      //如果数据不为空
      if(data.flag){
       //清空ul中的数据并显示
       $(".list").empty();
       $('.list').css('display','block');
       // 循坏遍历返回值,并添加到li中
       $(data.data).each(function(position){
        $(".list").append("li>a href='__APP__/Dormitory/index/sid/"+data.data[position].sid+"'>"+data.data[position].name+"/a>/li>");
       });
     }else{
      //不显示
      $('.list').css('display','none');
     }
   });
 });
});
/script>
/html>

/* CSS Document */
* {
  margin:0;
  padding:0;
}
body {
  background:#FBFBFB;
  width:100%;
}
ul {
  list-style:none;
}
a {
  text-decoration:none;
}
.right ul li a:active {
  color:#FF5C57;
}
.left ul li a:active {
  color:#FF5C57;
}
.right ul li a:hover {
  color:#FF5C57;
}
.left ul li a:hover {
  color:#FF5C57;
}
.title {
  background:#C32D32;
  height:50px;
  width:100%;
  line-height:50px;
  text-align:center;
  font-family:Arial, Helvetica, sans-serif;
  font-size:18px;
  color:#FFF;
}
.search-w {
  text-align:center;
  width:100%;
  height:50px;
}
.search {
  width:95%;
  height:30px;
  text-align:center;
  margin-top:1%;
  border:#ccc 1px solid;
  font-size:14px;
  background: #FFF url(image/s1.png) no-repeat 15% 5px;
}
.list {
  width:95%;
  text-align:left;
  border:#ccc 1px solid;
  font-size:14px;
  margin:0 auto;
  background:#FFF;
   position:relative;
}
.list li {
  height:35px;
  width:100%;
  line-height:35px;
  border-bottom:#DFDFDF 1px solid;
}
.list li a{color:#939393; width:100%; height:100%; display:block;}
.list li a:hover {
  color:#ff5c57;
}
.wraper{
  width: 100%;
  height:100%;
}
.center{
  width:95%;
  height:100%;
}
.left {
  margin-top:5px;
  width:19.9%;
  background:#FBFBFB;
  float:left;
  border-top:#DFDFDF 1px solid;
  overflow:hidden;
}
.left ul {
  width:100%;
  height:100%;
}
.left ul li {
  height:60px;
  line-height:60px;
  border-bottom:#F1F1F1 1px solid;
  text-align:center;
  border-right:1px solid #C0C0C0;
}
.left ul li a {
  color:#939393;
  font-weight: bold;
  height:100%;
  width:100%;
  display:block;
}
.right {
  margin-top:5px;
  width:80%;
  background:#FFF;
  float:left;
  border-top:#DFDFDF 1px solid;
}
.right ul li a {
  padding-left: 5%;
  color:#939393;
  height:100%;
  width:95%;
  display:block;
}
.right ul {
  width:100%;
  height:100%;
}
.right ul li {
  height:45px;
  line-height:45px;
  width:100%;
  text-align:left;
  border-bottom:#E8E8E8 1px solid;
  color:#7C7C7C;
}
.right ul p{
  height:45px;
  line-height:45px;
  width:100%;
  text-align:center;
  border-bottom:#E8E8E8 1px solid;
  color:#939393;
  font-weight: bold;
  font-size: 18px;
}