PHP combined with AJAX to implement search prompt function
PHP combined with AJAX to implement the search prompt function
First create an input box; then listen to the keyup event of the input box, when the event is triggered , use AJAX request to send the input content to PHP; then PHP searches for data based on the input content and returns it; finally, the returned data is rendered.
Sample code
Client:
<script> $(document).ready(function(){ var xhr=null; $('input[name="keyword"]').keyup(function() { if(xhr){ xhr.abort();//如果存在ajax的请求,就放弃请求 } var inputText= $.trim(this.value); if(inputText!=""){//检测键盘输入的内容是否为空,为空就不发出请求 xhr=$.ajax({ type: 'GET', url: 'service/suggestion.php', cache:false,//不从浏览器缓存中加载请求信息 data: "keyword=" + inputText,//向服务器端发送的数据 dataType: 'json',//服务器返回数据的类型为json success: function (json) { if (json.length != 0) {//检测返回的结果是否为空 var lists = "<ul>"; $.each(json, function () { lists += "<li>"+this.pd_name+"</li>";//遍历出每一条返回的数据 }); lists+="</ul>"; $("#searchBox").html(lists).show();//将搜索到的结果展示出来 $("li").click(function(){ $("#keyword").val($(this).text());//点击某个li就会获取当前的值 $("#searchBox").hide(); }) } else { $("#searchBox").hide(); } } }); }else{ $("#searchBox").hide();//没有查询结果就隐藏搜索框 } }).blur(function(){ $("#searchBox").hide();//输入框失去焦点的时候就隐藏搜索框 }); }); </script>
Server :
<?php session_start(); function connectDb(){//连接数据库的函数 $db_server="localhost"; $db_name="test";//数据库的名称 $db_user="root";//数据库的用户名,不同的用户权限不同 $db_pwd="";//数据库的密码 $dsn="mysql:host=$db_server;dbname=$db_name;charset=utf8";//使用PDO的方法连接数据库 try{ $connect=new PDO($dsn,$db_user,$db_pwd,array(PDO::ATTR_PERSISTENT=>true));//如果需要数据库长连接,需要最后加一个参数 } catch(PDOException $e){ exit('数据库连接失败'); } return $connect; } function test($keyword){//从数据库中查找关键字的函数 $db=connectDb(); $result=$db->prepare("select 字段名 from 数据库名字 where 字段名 like ?"); $result->bindParam(1,$keyword);//第一个问号的值 $result=>execute; return $result->fetchAll(PDO::FETCH_ASSOC); } $keyword=$_GET['keyword'];//获取输入框的内容 $suggestion=test($keyword); echo json_encode($suggestion);//输出查询的结果(json格式输出) ?>
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