This article mainly introduces Ajax and mysql data interaction in detail to realize the message board function. It has certain reference value. Interested friends can refer to it.
I recently made a small The demo implements the data interaction between Ajax and MySQL. The js part uses jq, the backend uses php, and the database is mysql. A node mongodb version will be released 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>Copy after login
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>Copy after login
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");
?>Copy after login
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";
Copy after login
. This line refers to other codes
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;
}
?>Copy after login
. The above is what I compiled for everyone. I hope it will be helpful to everyone in the future.
Related articles:
Instances of ajax responding to json strings and json arrays (graphic tutorial)
Ajax synchronization and asynchronous issues Brief analysis and solutions
Two methods for Ajax to solve redundant refresh
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