php+ajax实现无刷新的新闻留言系统_php技巧-PHP Tutorial-php.cn

Home

Backend Development

PHP Tutorial

php+ajax实现无刷新的新闻留言系统_php技巧

WBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWB

May 16, 2016 pm 08:05 PM

php

本文介绍了一款无刷新的新闻留言系统，最简明易懂的一个ajax无刷新留言系统，源码中省略了接受数据验证的过程，大家可根据自己的需求进行扩展，下面进入主题。

核心源码：

1.配置文件:config.php,代码如下：

<&#63;php 
 //数据库配置信息(用户名,密码，数据库名，表前缀等) 
 $cfg_dbhost = "localhost"; 
 $cfg_dbuser = "root"; 
 $cfg_dbpwd = "root"; 
 $cfg_dbname = "ajaxdemo1"; 
 $cfg_dbprefix = ""; 
 $link = mysql_connect($cfg_dbhost,$cfg_dbuser,$cfg_dbpwd); 
 mysql_select_db($cfg_dbname); 
 mysql_query("set names utf8"); 
&#63;>

2.处理请求:deal.php,代码如下：

<&#63;php 
 header("Content-type:text/html;charset=utf-8"); 
 include "config.php"; 
 //post接收数据,只是演示效果,这里就省去验证了 
 $name = $_POST['name']; 
 $content = $_POST['content']; 
 $sql = "insert into test (name,content) values ('{$name}','{$content}');"; 
 $res = mysql_query($sql,$link); 
 if($res){ 
 echo '{"name": "'.$name.'","content": "'.$content.'","status": "1"}'; 
 } 
&#63;>

3.首页代码:index.php,代码如下：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml"> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 
<title>无刷新</title> 
<link href="css/css.css" type="text/css" rel="stylesheet" /> 
<style type="text/css"> 
body{color:#555;font-size:14px;padding:0;margin:0;} 
#form { background:#dedede; padding:10px 20px; width:300px;} 
#show{ background:#f6f6f6;padding:10px 20px; width:300px;} 
#show p{ margin:6px; font-size:13px; line-height:22px; border-bottom:1px dashed #cdcdcd;} 
</style> 
<script type="text/javascript" src="jquery-1.7.2.min.js"></script> 
<script type="text/javascript"> 
$(function(){ 
 $("#sub").click(function(){ 
 //只是说明原理,然后这里省去了验证文本框内容的步骤，直接发送ajax请求 
 $.post("deal.php",{name : $("#name").val(), content : $("#content").val()}, function(data){ 
  if(data.status){ 
   var str = "<p><strong>"+data.name+"</strong> 发表了："+data.content+"</p>"; 
   $("#show").prepend(str); //在前面追加 
  }else{ 
   alert("评论失败"); 
  } 
  }, 'json'); 
 });   
}); 
</script> 
</head> 
<body> 
<div id="form"> 
 <form action="deal.php" method="get" id="suggest_form"> 
 用户名：<input type="text" name="name" id="name" /><br/> 
 内  容：<textarea name="content" id="content"></textarea>   
 <input type="button" value="发布" id="sub" /> 
 </form> 
</div> 
<div id="show"> 
<&#63;php 
 include "config.php"; 
 $sql = "select * from test;"; 
 $res = mysql_query($sql,$link); 
 while($row=mysql_fetch_array($res)){ 
 echo "<p><strong>".$row['name']."</strong> 发表了：".$row['content']."</p>"; 
 } 
&#63;> 
</div> 
</body> 
</html>

数据库文件,代码如下:

DROP TABLE IF EXISTS `test`; 
CREATE TABLE `test` ( 
 `id` int(10) unsigned NOT NULL AUTO_INCREMENT, 
 `name` varchar(64) NOT NULL, 
 `content` text NOT NULL, 
 PRIMARY KEY (`id`) 
) ENGINE=MyISAM DEFAULT CHARSET=utf8;

以上就是为大家分享的php+ajax实现无刷新的新闻留言系统，希望对大家的学习有所帮助。

Statement

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

How does PHP type hinting work, including scalar types, return types, union types, and nullable types?Apr 17, 2025 am 12:25 AM

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.

How does PHP handle object cloning (clone keyword) and the __clone magic method?Apr 17, 2025 am 12:24 AM

In PHP, use the clone keyword to create a copy of the object and customize the cloning behavior through the \_\_clone magic method. 1. Use the clone keyword to make a shallow copy, cloning the object's properties but not the object's properties. 2. The \_\_clone method can deeply copy nested objects to avoid shallow copying problems. 3. Pay attention to avoid circular references and performance problems in cloning, and optimize cloning operations to improve efficiency.

PHP vs. Python: Use Cases and ApplicationsApr 17, 2025 am 12:23 AM

PHP is suitable for web development and content management systems, and Python is suitable for data science, machine learning and automation scripts. 1.PHP performs well in building fast and scalable websites and applications and is commonly used in CMS such as WordPress. 2. Python has performed outstandingly in the fields of data science and machine learning, with rich libraries such as NumPy and TensorFlow.

Describe different HTTP caching headers (e.g., Cache-Control, ETag, Last-Modified).Apr 17, 2025 am 12:22 AM

Key players in HTTP cache headers include Cache-Control, ETag, and Last-Modified. 1.Cache-Control is used to control caching policies. Example: Cache-Control:max-age=3600,public. 2. ETag verifies resource changes through unique identifiers, example: ETag: "686897696a7c876b7e". 3.Last-Modified indicates the resource's last modification time, example: Last-Modified:Wed,21Oct201507:28:00GMT.

Explain secure password hashing in PHP (e.g., password_hash, password_verify). Why not use MD5 or SHA1?Apr 17, 2025 am 12:06 AM

In PHP, password_hash and password_verify functions should be used to implement secure password hashing, and MD5 or SHA1 should not be used. 1) password_hash generates a hash containing salt values to enhance security. 2) Password_verify verify password and ensure security by comparing hash values. 3) MD5 and SHA1 are vulnerable and lack salt values, and are not suitable for modern password security.

PHP: An Introduction to the Server-Side Scripting LanguageApr 16, 2025 am 12:18 AM

PHP is a server-side scripting language used for dynamic web development and server-side applications. 1.PHP is an interpreted language that does not require compilation and is suitable for rapid development. 2. PHP code is embedded in HTML, making it easy to develop web pages. 3. PHP processes server-side logic, generates HTML output, and supports user interaction and data processing. 4. PHP can interact with the database, process form submission, and execute server-side tasks.

PHP and the Web: Exploring its Long-Term ImpactApr 16, 2025 am 12:17 AM

PHP has shaped the network over the past few decades and will continue to play an important role in web development. 1) PHP originated in 1994 and has become the first choice for developers due to its ease of use and seamless integration with MySQL. 2) Its core functions include generating dynamic content and integrating with the database, allowing the website to be updated in real time and displayed in personalized manner. 3) The wide application and ecosystem of PHP have driven its long-term impact, but it also faces version updates and security challenges. 4) Performance improvements in recent years, such as the release of PHP7, enable it to compete with modern languages. 5) In the future, PHP needs to deal with new challenges such as containerization and microservices, but its flexibility and active community make it adaptable.

Why Use PHP? Advantages and Benefits ExplainedApr 16, 2025 am 12:16 AM

The core benefits of PHP include ease of learning, strong web development support, rich libraries and frameworks, high performance and scalability, cross-platform compatibility, and cost-effectiveness. 1) Easy to learn and use, suitable for beginners; 2) Good integration with web servers and supports multiple databases; 3) Have powerful frameworks such as Laravel; 4) High performance can be achieved through optimization; 5) Support multiple operating systems; 6) Open source to reduce development costs.

See all articles