Table of Contents
php+mysql combined with Ajax to implement a complete example of the like function, mysqlajax
Home Backend Development PHP Tutorial A complete example of using php+mysql combined with Ajax to implement the like function, mysqlajax_PHP tutorial

A complete example of using php+mysql combined with Ajax to implement the like function, mysqlajax_PHP tutorial

Jul 13, 2016 am 10:08 AM
ajax mysql php

php+mysql combined with Ajax to implement a complete example of the like function, mysqlajax

The example in this article describes the method of php+mysql combined with Ajax to implement the like function. Share it with everyone for your reference. The details are as follows:

To realize the like function, there are many ways to implement it. Here is a summary of the functions of using Ajax, php and mysql to realize the like data. The specific steps are as follows:

1. The HTML code part in the page:

<span>0</span>
<button onclick="goodplus(1);">good+1</button>

<span>0</span>
<button onclick="goodplus(2);">good+1</button>

<span>0</span>
<button onclick="goodplus(3);">good+1</button>

<span>0</span>
<button onclick="goodplus(4);">good+1</button>
Copy after login

2. Write javascript

1. Implement the click event of the button above goodplus

var span = document.getElementsByTagName('span');//获取存放点赞数的dom 
 var num; //点赞数 
 var flag = 0; //不同情况的标记 
  
 function goodplus(gindex){ 
  flag = 1; 
  num = parseInt(span.item(gindex-1).innerHTML); 
  if(checkcookie(gindex) == true){ 
   num = num + 1; 
   senddata(gindex); //通过Ajax修改页面上的数据 
  }else{ 
   alert("你已经点过赞咯!")  
  } 
}

Copy after login

2. The like data should be updated as soon as the page is opened

for(var i = 1; i < span.length + 1; i++){ 
  senddata(i);  
}
Copy after login

3. Get data through Ajax senddata function

function senddata(aindex){ 
  var xmlhttp; 
  var txt; 
  if(window.XMLHttpRequest){ 
   xmlhttp=new XMLHttpRequest(); 
  }else{ 
   xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); 
  } 
  xmlhttp.onreadystatechange=function(){ 
   if(xmlhttp.readyState == 4 && xmlhttp.status == 200){ 
    txt = xmlhttp.responseText; //获取返回的数据 
    var cookieindex = aindex - 1; 
    document.getElementsByTagName('span').item(cookieindex).innerHTML = txt; //赋值 
   } 
  } 
  xmlhttp.open("GET","路径/index.php&#63;num=" + num + '&flag=' + flag + '&aindex=' + aindex,true); 
  xmlhttp.send(); 
} 

Copy after login

4. Set a cookie to determine whether it has been liked. If there is a cookie, it will prompt that it has been liked. If there is no cookie, the like will be allowed and the cookie will be set

//判断是否已经存在了cookie 
function checkcookie(gindex){ 
  var thiscookie = 'goodplus' + gindex; 
  var mapcookie = getCookie(thiscookie) 
  if (mapcookie!=null && mapcookie!=""){ 
   return false; 
  }else { 
   setCookie(thiscookie,thiscookie,365); 
   return true; 
  }  
}

//获取cookie 
function getCookie(c_name){//获取cookie,参数是名称。 
  if (document.cookie.length > 0){//当cookie不为空的时候就开始查找名称 
   c_start = document.cookie.indexOf(c_name + "="); 
   if (c_start != -1){           //如果开始的位置不为-1就是找到了、找到了之后就要确定结束的位置 
    c_start = c_start + c_name.length + 1 ;
 //cookie的值存在名称和等号的后面,所以内容的开始位置应该是加上长度和1 
    c_end = document.cookie.indexOf(";" , c_start); 
    if (c_end == -1) { 
     c_end = document.cookie.length; 
    } 
    return unescape(document.cookie.substring(c_start , c_end));//返回内容,解码。 
   } 
  } 
  return ""; 
}

//设置cookie 
function setCookie(c_name,value,expiredays){
//存入名称,值,有效期。有效期到期事件是今天+有效天数。然后存储cookie, 
  var exdate=new Date(); 
  exdate.setDate( exdate.getDate() + expiredays ) 
  document.cookie = c_name + "=" + escape(value) + ((expiredays==null) &#63; "" : "; expires=" + exdate.toGMTString()) 
}

Copy after login

3. index.php page:

<&#63;php
$num = $_GET['num'];
$aindex = $_GET['aindex'];
$con = mysql_connect("localhost","root","");

if (!$con){
 die('Could not connect: ' . mysql_error());
}

mysql_select_db("goodplus", $con);

$sql0s = "SELECT * FROM `good` where `id` = ".$aindex;
$sql0 = mysql_query($sql0s);

if($_GET['flag'] == 0){
 while($row = mysql_fetch_array($sql0)){
 echo $row['value'];
 }
}else if($_GET['flag'] == 1){
 $sql="UPDATE `goodplus`.`good` SET `value` = '".$num."' WHERE `good`.`id` = ".$aindex;
 
 if (!mysql_query($sql,$con)){
 die('Error: ' . mysql_error());
 }
 echo $num;
}
mysql_close($con)
&#63;>

Copy after login

4. The final index.html page is as follows:





无标题文档




<span>0</span>
<button onclick="goodplus(1);">good+1</button>

<span>0</span>
<button onclick="goodplus(2);">good+1</button>

<span>0</span>
<button onclick="goodplus(3);">good+1</button>

<span>0</span>
<button onclick="goodplus(4);">good+1</button>





Copy after login

I hope this article will be helpful to everyone’s PHP programming design.

www.bkjia.comtruehttp: //www.bkjia.com/PHPjc/950898.htmlTechArticlephp+mysql combined with Ajax to achieve a complete example of the like function, mysqlajax This article describes the implementation of php+mysql combined with Ajax Like function method. Share it with everyone for your reference. The details are as follows:...
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

PHP and Python: Comparing Two Popular Programming Languages PHP and Python: Comparing Two Popular Programming Languages Apr 14, 2025 am 12:13 AM

PHP and Python each have their own advantages, and choose according to project requirements. 1.PHP is suitable for web development, especially for rapid development and maintenance of websites. 2. Python is suitable for data science, machine learning and artificial intelligence, with concise syntax and suitable for beginners.

PHP's Purpose: Building Dynamic Websites PHP's Purpose: Building Dynamic Websites Apr 15, 2025 am 12:18 AM

PHP is used to build dynamic websites, and its core functions include: 1. Generate dynamic content and generate web pages in real time by connecting with the database; 2. Process user interaction and form submissions, verify inputs and respond to operations; 3. Manage sessions and user authentication to provide a personalized experience; 4. Optimize performance and follow best practices to improve website efficiency and security.

The Enduring Relevance of PHP: Is It Still Alive? The Enduring Relevance of PHP: Is It Still Alive? Apr 14, 2025 am 12:12 AM

PHP is still dynamic and still occupies an important position in the field of modern programming. 1) PHP's simplicity and powerful community support make it widely used in web development; 2) Its flexibility and stability make it outstanding in handling web forms, database operations and file processing; 3) PHP is constantly evolving and optimizing, suitable for beginners and experienced developers.

PHP in Action: Real-World Examples and Applications PHP in Action: Real-World Examples and Applications Apr 14, 2025 am 12:19 AM

PHP is widely used in e-commerce, content management systems and API development. 1) E-commerce: used for shopping cart function and payment processing. 2) Content management system: used for dynamic content generation and user management. 3) API development: used for RESTful API development and API security. Through performance optimization and best practices, the efficiency and maintainability of PHP applications are improved.

How to connect to the database of apache How to connect to the database of apache Apr 13, 2025 pm 01:03 PM

Apache connects to a database requires the following steps: Install the database driver. Configure the web.xml file to create a connection pool. Create a JDBC data source and specify the connection settings. Use the JDBC API to access the database from Java code, including getting connections, creating statements, binding parameters, executing queries or updates, and processing results.

PHP and Python: Code Examples and Comparison PHP and Python: Code Examples and Comparison Apr 15, 2025 am 12:07 AM

PHP and Python have their own advantages and disadvantages, and the choice depends on project needs and personal preferences. 1.PHP is suitable for rapid development and maintenance of large-scale web applications. 2. Python dominates the field of data science and machine learning.

PHP and Python: Different Paradigms Explained PHP and Python: Different Paradigms Explained Apr 18, 2025 am 12:26 AM

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP: Handling Databases and Server-Side Logic PHP: Handling Databases and Server-Side Logic Apr 15, 2025 am 12:15 AM

PHP uses MySQLi and PDO extensions to interact in database operations and server-side logic processing, and processes server-side logic through functions such as session management. 1) Use MySQLi or PDO to connect to the database and execute SQL queries. 2) Handle HTTP requests and user status through session management and other functions. 3) Use transactions to ensure the atomicity of database operations. 4) Prevent SQL injection, use exception handling and closing connections for debugging. 5) Optimize performance through indexing and cache, write highly readable code and perform error handling.

See all articles