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How to implement real-time data update in jquery php

藏色散人Original: 2022-01-06 09:21:043200browse

Jquery php method to implement real-time data update: 1. Create a data table; 2. Connect to the database by creating the server file "demo.php" and perform related operations; 3. Create "fresh.html" to display the data Just the web page.

#The operating environment of this article: Windows 7 system, PHP version 7.1, Dell G3 computer.

How does jquery php implement real-time data update?

php jQuery ajax implemented real-time refresh display data function example

The details are as follows:

Create data table: demo

--
-- 表的结构 `demo`
--
CREATE TABLE IF NOT EXISTS `demo` (
 `id` int(11) NOT NULL AUTO_INCREMENT,
 `name` varchar(20) COLLATE utf8_bin NOT NULL,
 PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin AUTO_INCREMENT=5 ;
--
-- 转存表中的数据 `demo`
--
INSERT INTO `demo` (`id`, `name`) VALUES
(1, &#39;雷军&#39;),
(2, &#39;马化腾&#39;),
(3, &#39;李彦宏&#39;),
(4, &#39;马云&#39;);

Server file: demo.php

<?php
$mysqli = new mysqli("localhost","root","","test");
$mysqli->set_charset(&#39;utf8&#39;);
$query = &#39;SELECT * FROM demo&#39;;
$result = $mysqli->query($query);
$arr = $result->fetch_all(MYSQLI_ASSOC);
$info = json_encode($arr);
echo $json = &#39;{"success":true,"info":&#39;.$info.&#39;}&#39;;

Display data web page: fresh.html

<html>
<head>
  <meta charset=&#39;utf-8&#39;>
  <title>hello</title>
</head>
<body>
<script src="http://lib.sinaapp.com/js/jquery/1.9.1/jquery-1.9.1.min.js"></script>
<script>
  function check(){
    $.ajax({
      type:"GET",
      url:"./demo.php",
      dataType:"json",
      success:function(data){
        if(data.success){
          var count = data.info.length;
            for(i=0;i<count;i++){
              var dom = "<tr align=&#39;center&#39; id=&#39;"+data.info[i].id+"&#39;><td>"+data.info[i].id+"</td><td>"+data.info[i].name+"</td></tr>";
              var tag = &#39;#&#39;+data.info[i].id;
              if(!$(tag).length){
                $("#info").append(dom);
              }
            }
        }else{
          alert(&#39;error&#39;);
        }
      },
      error:function(res){
        alert(res.status);
      }
    });
  }
  window.setInterval(check, 1000); //每秒执行一次
</script>
<body>
  <div style=&#39;width:600px;margin:0 auto;&#39;>
    <table border=&#39;1&#39; width="600px">
      <thead>
        <tr><th>id</th><th>name</th></tr>
      </thead>
      <tbody id=&#39;info&#39;>
        <tr align=&#39;center&#39; id=&#39;111&#39;><td>111</td><td>测试</td></tr>
      </tbody>
    </table>
  </div>
</body>
</html>

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