Ajax and mysql data interaction to create message board function
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>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
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;
}
?>. 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
The above is the detailed content of Ajax and mysql data interaction to create message board function. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
1386
52
MySQL: Simple Concepts for Easy Learning
Apr 10, 2025 am 09:29 AM
MySQL is an open source relational database management system. 1) Create database and tables: Use the CREATEDATABASE and CREATETABLE commands. 2) Basic operations: INSERT, UPDATE, DELETE and SELECT. 3) Advanced operations: JOIN, subquery and transaction processing. 4) Debugging skills: Check syntax, data type and permissions. 5) Optimization suggestions: Use indexes, avoid SELECT* and use transactions.
How to open phpmyadmin
Apr 10, 2025 pm 10:51 PM
You can open phpMyAdmin through the following steps: 1. Log in to the website control panel; 2. Find and click the phpMyAdmin icon; 3. Enter MySQL credentials; 4. Click "Login".
MySQL: An Introduction to the World's Most Popular Database
Apr 12, 2025 am 12:18 AM
MySQL is an open source relational database management system, mainly used to store and retrieve data quickly and reliably. Its working principle includes client requests, query resolution, execution of queries and return results. Examples of usage include creating tables, inserting and querying data, and advanced features such as JOIN operations. Common errors involve SQL syntax, data types, and permissions, and optimization suggestions include the use of indexes, optimized queries, and partitioning of tables.
How to use single threaded redis
Apr 10, 2025 pm 07:12 PM
Redis uses a single threaded architecture to provide high performance, simplicity, and consistency. It utilizes I/O multiplexing, event loops, non-blocking I/O, and shared memory to improve concurrency, but with limitations of concurrency limitations, single point of failure, and unsuitable for write-intensive workloads.
Why Use MySQL? Benefits and Advantages
Apr 12, 2025 am 12:17 AM
MySQL is chosen for its performance, reliability, ease of use, and community support. 1.MySQL provides efficient data storage and retrieval functions, supporting multiple data types and advanced query operations. 2. Adopt client-server architecture and multiple storage engines to support transaction and query optimization. 3. Easy to use, supports a variety of operating systems and programming languages. 4. Have strong community support and provide rich resources and solutions.
MySQL's Place: Databases and Programming
Apr 13, 2025 am 12:18 AM
MySQL's position in databases and programming is very important. It is an open source relational database management system that is widely used in various application scenarios. 1) MySQL provides efficient data storage, organization and retrieval functions, supporting Web, mobile and enterprise-level systems. 2) It uses a client-server architecture, supports multiple storage engines and index optimization. 3) Basic usages include creating tables and inserting data, and advanced usages involve multi-table JOINs and complex queries. 4) Frequently asked questions such as SQL syntax errors and performance issues can be debugged through the EXPLAIN command and slow query log. 5) Performance optimization methods include rational use of indexes, optimized query and use of caches. Best practices include using transactions and PreparedStatemen
MySQL and SQL: Essential Skills for Developers
Apr 10, 2025 am 09:30 AM
MySQL and SQL are essential skills for developers. 1.MySQL is an open source relational database management system, and SQL is the standard language used to manage and operate databases. 2.MySQL supports multiple storage engines through efficient data storage and retrieval functions, and SQL completes complex data operations through simple statements. 3. Examples of usage include basic queries and advanced queries, such as filtering and sorting by condition. 4. Common errors include syntax errors and performance issues, which can be optimized by checking SQL statements and using EXPLAIN commands. 5. Performance optimization techniques include using indexes, avoiding full table scanning, optimizing JOIN operations and improving code readability.
Monitor Redis Droplet with Redis Exporter Service
Apr 10, 2025 pm 01:36 PM
Effective monitoring of Redis databases is critical to maintaining optimal performance, identifying potential bottlenecks, and ensuring overall system reliability. Redis Exporter Service is a powerful utility designed to monitor Redis databases using Prometheus. This tutorial will guide you through the complete setup and configuration of Redis Exporter Service, ensuring you seamlessly build monitoring solutions. By studying this tutorial, you will achieve fully operational monitoring settings
