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Ajax+mysql creates message board function

php中世界最好的语言
php中世界最好的语言Original
2018-04-02 14:58:101945browse

This time I will bring you the function of making a message board with Ajax+mysql. What are the precautions for making a message board with Ajax+mysql? The following is a practical case, let's take a look.

Recently I made a small demo to realize the data interaction between Ajax and MySQL. The js part uses jq, the backend uses php, and the database is mysql. I will make a node+mongodb version later.

I won’t go into details about the use and installation of mysql. I integrate Baidu xampp, Apache server and mysql database by myself, which is very easy to use.

First open the server and database. I first created an "eleven" database here, and then created a table called microblog (please note: I am using a high version of mysql here, and PHP is linked to the database. All methods use mysqli_ If the version is too low, please use the mysql_ method and modify the code yourself)
The following is the code part:

html page and js part: 

<!DOCTYPE html> 
<html> 
  <head> 
    <meta charset="UTF-8"> 
    <title>微博留言板</title> 
    <style type="text/css"> 
      *{ 
        margin: 0; 
        padding: 0; 
      } 
      #box{ 
        width: 600px; 
        /*height: 500px;*/ 
        border: 2px solid rgb(85,85,85); 
        border-radius: 15px; 
        margin: 50px auto; 
        padding: 20px 10px 15px; 
        background-color: rgb(85,85,85); 
      } 
      #content{ 
        display: block; 
        resize: none; 
        width: 550px; 
        height: 200px; 
        margin: 0 auto; 
        border: 2px solid rgb(225,225,225); 
        border-radius: 10px; 
        text-align: center; 
        font-size: 30px; 
        background-color: rgb(225,225,225); 
      } 
      #content:focus{ 
        outline: none; 
        border: 2px solid rgb(225,225,225); 
        box-shadow: 0 0 15px rgb(225,225,225); 
      } 
      #btn{ 
        border: 2px solid rgb(255,204,0); 
        width: 80px; 
        height: 40px; 
        border-radius: 5px; 
        margin-top: 30px; 
        font-size: 17px; 
        cursor: pointer; 
        outline: none; 
        background-color: rgb(255,204,0); 
      } 
       
      .list{ 
        list-style: none; 
        background-color: rgb(249,249,249); 
        margin-top: 20px; 
      } 
      .list>li{ 
        padding: 20px 10px 10px; 
        border-bottom: 2px solid rgb(68,68,68); 
        font-size: 20px; 
        color: rgb(200,214,225); 
        position: relative; 
        word-break: break-word; 
        word-wrap: break-word; 
        background-color: rgb(85,85,85); 
         
      } 
      .list>li>.control{ 
        position: absolute; 
        bottom: 3px; 
        right: 5px; 
        font-size: 14px; 
      } 
      .list>li>p{ 
        margin-bottom: 25px; 
      } 
      .control span,.control em{ 
        display: inline-block; 
        margin-right: 15px; 
      } 
      .control em{ 
        color: darkblue; 
        cursor: pointer; 
      } 
      a{ 
        text-decoration: none; 
        color: darkred; 
      } 
      #page>a{ 
        display:inline-block; 
        width: 40px; 
        height: 30px; 
        margin-top: 10px; 
        text-align: center; 
        line-height: 30px; 
        font-size: 20px; 
        border-radius: 5px; 
        color: white; 
        background-color: rgb(51,21,70); 
      } 
      #head{ 
        color: rgb(200,214,225); 
        font-size: 30px; 
        height: 50px; 
        border-bottom: 2px solid rgb(68,68,68); 
        margin-bottom: 20px; 
      } 
    </style> 
  </head> 
  <body> 
    <p id="box"> 
      <p id="head"> 
        留言板 
      </p> 
      <p id="fill_in"> 
        <textarea id="content"></textarea> 
        <button id="btn">提交留言</button> 
      </p> 
      <!--留言列表--> 
      <p id="message_text"> 
        <ul class="list"> 
        </ul> 
      </p> 
      <!--分页--> 
      <p id="page"> 
        <a href="javasript:void(0)" rel="external nofollow" rel="external nofollow" rel="external nofollow" >1</a> 
        <a href="javasript:void(0)" rel="external nofollow" rel="external nofollow" rel="external nofollow" >2</a> 
      </p> 
    </p> 
  </body> 
  <script src="Jq/jquery-3.1.1.min.js"> 
</html>

Code display Not finished, here is part of the php code.
Continue with part 01, jq’s ajax request: 

<script type="text/javascript"> 
    $(function(){ 
      $("#btn").on("click",function(){ 
        if ($("#content").val() == "") { 
          alert("~~客官，说一句再走呗~~"); 
          return; 
        }  
        else{ 
          $.ajax({ 
            type:"get", 
            url:"http://localhost/phpStudy/ajax03/message.php", 
            async:true, 
            dataType:"json", 
            data:{ 
              content:$("#content").val(), 
              act:"add" 
            }, 
            success:function(data){ 
//             var result = JSON.parse(data); 
              if (data.error==0) { 
                createLi(data.id,$("#content").val(),data.time); 
              } else{ 
                alert(data.msg); 
              } 
            } 
          }); 
        } 
         
      }); 
       
      //创建节点 
      function createLi(id,content,time){ 
        var html = $('<li><p>'+content+'</p><p class="control"><span>时间：'+time+'</span>顶：<em>0</em>踩：<em>0</em><a class="remove" href="javasript:void(0)" rel="external nofollow" rel="external nofollow" rel="external nofollow" >删除</a></p></li>'); 
          $(".list").prepend(html); 
          var h = html.height(); 
          html.height(0); 
          html.stop().animate({ 
            height:h 
          },300); 
          //删除 
          html.find(".remove").on("click",function(){ 
            html.stop().animate({ 
              height:0 
            },300,function(){ 
              html.remove(); 
            }) 
          }); 
      } 
    }) 
  </script>

This part is the php code part: 

<?php 
  header("Content-type:text/html;charset=utf8"); 
   date_default_timezone_set("PRC"); 
   //链接数据库 
   $link = mysqli_connect("localhost", "root", "", "eleven"); 
   //设置数据库编码格式 
   mysqli_query($link, "set names utf8"); 
?>

Note: I wrote this part as public code because I am learning to do other things is called, so the following code will have 

include_once "comment.php";

This line refers to other codes 

<?php 
  /* 
   * 开发文档 
   * 1.用于提交的留言留言进行存储 
   * url：http://localhost/phpStudy/ajax03/message.php 
   * 提交方式：get 
   * 提交参数说明： 
   * content 必须 留言板内容 
   * act 必须 借口标识 
   * 返回参数说明 
   * 成功：{"error":"0","id":1,"time":"2016-11-30"} 
   * 失败：{"error":1,"msg":"留言失败，请重试"} 
   * 
   * 2.up 
   * id 必须 留言的id编号 
   * act 必须 接口标识 up 
   * 返回声明 
   * 成功：{"error":"0"} 
   * 失败：{"error":"1","msg":"点赞失败"} 
   * 
   * 3.分页（获取页码的接口）； 
   * act 必须 接口标识 count 
   * 返回参数说明： 
   * 成功：{"error":"0","countPage":"3"}; 
   * 失败：{"error":"1","msg":"请求数据失败，请重试！"} 
   * 
   * 4.分页（点击页码跳转） 
   * url：http://localhost/phpStudy/ajax03/message.php 
   * 提交方式：get 
   * 提交参数说明： 
   * starPage 必须参数 页码索引值 
   * act 必须 接口标识 page 
   * 返回参数说明 
   * 成功：{"error":"0","data":[{},{},{},{},{}]} 
   * 失败：{"error":"1","msg":"数据查询失败，请重试！"} 
   * 
   */ 
   include_once "comment.php"; 
   $act = $_GET["act"];//接口请求标识 
   switch ($act) { 
    case &#39;add&#39;://提交留言 
      $content = $_GET["content"]; 
      $time = time(); 
      $times = date("Y-m-d H:i:s",$time); 
      $query = "INSERT INTO microblog(id,content,time) VALUES(null,&#39;{$content}&#39;,&#39;{$times}&#39;)"; 
      mysqli_query($link,$query); 
      $insertId = mysqli_insert_id($link); 
      if($insertId>0){ 
        $arr = ["error"=>0,"id"=>$insertId,"time"=>$times]; 
        echo json_encode($arr);//将数组转化为json，方便前端使用 
      } 
      else{ 
        $arr = ["error"=>1,"msg"=>"留言失败，请重试!"]; 
        echo json_encode($arr);//将数组转化为json，方便前端使用 
      } 
      break; 
       
    case 'up': 
      $id = $_GET['id']; 
      $search = "SELECT up FROM microblog WHERE id = $id"; 
      $result = mysqli_query($link, $search); 
      $upNum = mysqli_fetch_row($result)[0]; 
      $upNum++; 
      $query = "UPDATE microblog SET up='{$upNum}' WHERE id = '{$id}'"; 
      mysqli_query($link,$query); 
      if(mysqli_affected_rows($link)){//更新数据成功 
        echo '{"error":"0"}'; 
      } 
      else{//更新失败 
        echo '{"error":"1","msg":"点赞失败！"}'; 
      } 
      break; 
       
    case 'down': 
      $id = $_GET['id']; 
      $search = "SELECT down FROM microblog WHERE id = $id"; 
      $result = mysqli_query($link, $search); 
      $downNum = mysqli_fetch_row($result)[0]; 
      $downNum++; 
      $query = "UPDATE microblog SET down='{$downNum}' WHERE id = '{$id}'"; 
      mysqli_query($link,$query); 
      if(mysqli_affected_rows($link)){//更新数据成功 
        echo '{"error":"0"}'; 
      } 
      else{//更新失败 
        echo '{"error":"1","msg":"踩失败！"}'; 
      } 
      break;  
    case 'remove': 
      $id = $_GET['id']; 
      $query ="DELETE FROM microblog WHERE id='{$id}'"; 
      mysqli_query($link,$query); 
      if(mysqli_affected_rows($link)>0){//删除数据成功 
        echo '{"error":"0"}'; 
      } 
      else{ 
        echo '{"error":"1","msg":"删除失败！"}'; 
      } 
      break; 
    case 'count'://返回总页码 
      $query = "SELECT count(id) FROM   microblog"; 
      $result = mysqli_query($link, $query); 
      $count = mysqli_fetch_row($result)[0];//以索引数组形式返回查询结果 
      $countPage = ceil($count/5); 
      echo '{"error":"0","countPage":"'.$countPage.'"}'; 
      break;  
    case 'page'://点击分页或者是页面第一次加载 
      $index = $_GET["num"]*5; 
      $search = "SELECT * FROM microblog ORDER BY id DESC LIMIT {$index},5";//倒叙查询留言 
      $result = mysqli_query($link, $search); 
      $arr = [];//存查询出来的数据 
      while($row = mysqli_fetch_assoc($result)){ 
        array_unshift($arr,$row); 
      } 
//     print_r($arr); 
//     {"error":"0","info":[{},{},{},{},{}]} 
      $resultArr = ["error"=>"0","info"=>$arr]; 
      echo json_encode($resultArr); 
      break; 
     
   } 
?>

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other php Chinese websites related articles!

Recommended reading:

What is the difference between synchronization and asynchronous implementation using Ajax

AJAX cross-domain request JSONP to obtain JSON data Detailed explanation of steps (with code)

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