PHP和AJAX的RSS阅读器
PHP和AJAX的RSS阅读器,RSS阅读器是用来读取RSS信息,允许快速的RSS浏览新闻和更新.
AJAX的RSS阅读器:在AJAX以下例子,我们将展示一个RSS阅读器的内容从RSS是载入网页无需刷新.
在HTML表单:这是HTML网页,它包含一个简单的HTML表格,并链接到一个JavaScript:
<html> <head> <script type="text/javascript" src="getrss.js"></script> </head> <body><form> Select an RSS-Feed: <select onchange="showRSS(this.value)"> <option value="Google">Google News</option> <option value="MSNBC">MSNBC News</option> </select> </form><p><div id="rssOutput"> <b>RSS Feed will be listed here.</b></div></p> </body> </html>
例如解释-的H TML表单正如你可以看到,HTML网页上面载有一个简单的HTML表单的下拉框,作品的形式像这样,事件触发时,用户选择一个选项在下拉框中当事件触发的功能要求showRSS ()被处决,下面的形式是一个
var xmlHttp
function showRSS(str) {
xmlHttp = GetXmlHttpObject()
if (xmlHttp == null) {
alert("Browser does not support HTTP Request")
return
}
var url = "getrss.php"
url = url + "?q=" + str
url = url + "&sid=" + Math.random()
xmlHttp.onreadystatechange = stateChanged
xmlHttp.open("GET", url, true)
xmlHttp.send(null)
}
function stateChanged() {
if (xmlHttp.readyState == 4 || xmlHttp.readyState == "complete") {
document.getElementById("rssOutput")
.innerHTML = xmlHttp.responseText
}
}
function GetXmlHttpObject() {
var xmlHttp = null;
try {
// Firefox, Opera 8.0+, Safari
xmlHttp = new XMLHttpRequest();
} catch (e) {
// Internet Explorer
try {
xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
} catch (e) {
xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
}
}
return xmlHttp;
}例如解释 该stateChanged ()和GetXmlHttpObject职能是一样的PHP的AJAX推荐的篇章,该showRSS ()函数每一次的选择是选择在输入外地执行这一职能如下:界定了网址（档）传送给服务器 添加一个参数（ Q ）的网址与选定的选项从下拉框中 添加一个随机数字,以防止服务器使用快取档案,吁请GetXmlHttpObject函数创建一个XMLHTTP物件,并讲述了对象执行的功能要求时stateChanged变化是触发 开幕XMLHTTP物件与特定网址,发送一个HTTP请求到服务器,PHP页面网页服务器要求的JavaScript代码是一个PHP文件名为"getrss.php" :
<?php
//get the q parameter from URL
$q = $_GET["q"];
//find out which feed was selected
if ($q == "Google") {
$xml = ("http://news.phprm.com/news?ned=us&topic=h&output=rss");
} elseif ($q == "MSNBC") {
$xml = ("http://rss.msnbc.msn.com/id/3032091/device/rss/rss.xml");
}
$xmlDoc = new DOMDocument();
$xmlDoc->load($xml);
//get elements from "<channel>"
$channel = $xmlDoc->getElementsByTagName('channel')->item(0);
$channel_title = $channel->getElementsByTagName('title')->item(0)->childNodes->item(0)->nodeValue;
$channel_link = $channel->getElementsByTagName('link')->item(0)->childNodes->item(0)->nodeValue;
$channel_desc = $channel->getElementsByTagName('description')->item(0)->childNodes->item(0)->nodeValue;
//output elements from "<channel>"
echo ("<p><a href='" . $channel_link . "'>" . $channel_title . "</a>");
echo ("<br />");
echo ($channel_desc . "</p>");
//get and output "<item>" elements
$x = $xmlDoc->getElementsByTagName('item');
for ($i = 0; $i <= 2; $i++) {
$item_title = $x->item($i)->getElementsByTagName('title')->item(0)->childNodes->item(0)->nodeValue;
$item_link = $x->item($i)->getElementsByTagName('link')->item(0)->childNodes->item(0)->nodeValue;
$item_desc = $x->item($i)->getElementsByTagName('description')->item(0)->childNodes->item(0)->nodeValue;
echo ("<p><a href='" . $item_link . "'>" . $item_title . "</a>");
echo ("<br />");
echo ($item_desc . "</p>");
}
?>本文地址：
转载随意，但请附上文章地址:-)
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
1664
14
1423
52
1318
25
1268
29
1248
24
Explain JSON Web Tokens (JWT) and their use case in PHP APIs.
Apr 05, 2025 am 12:04 AM
JWT is an open standard based on JSON, used to securely transmit information between parties, mainly for identity authentication and information exchange. 1. JWT consists of three parts: Header, Payload and Signature. 2. The working principle of JWT includes three steps: generating JWT, verifying JWT and parsing Payload. 3. When using JWT for authentication in PHP, JWT can be generated and verified, and user role and permission information can be included in advanced usage. 4. Common errors include signature verification failure, token expiration, and payload oversized. Debugging skills include using debugging tools and logging. 5. Performance optimization and best practices include using appropriate signature algorithms, setting validity periods reasonably,
PHP Program to Count Vowels in a String
Feb 07, 2025 pm 12:12 PM
A string is a sequence of characters, including letters, numbers, and symbols. This tutorial will learn how to calculate the number of vowels in a given string in PHP using different methods. The vowels in English are a, e, i, o, u, and they can be uppercase or lowercase. What is a vowel? Vowels are alphabetic characters that represent a specific pronunciation. There are five vowels in English, including uppercase and lowercase: a, e, i, o, u Example 1 Input: String = "Tutorialspoint" Output: 6 explain The vowels in the string "Tutorialspoint" are u, o, i, a, o, i. There are 6 yuan in total
Explain late static binding in PHP (static::).
Apr 03, 2025 am 12:04 AM
Static binding (static::) implements late static binding (LSB) in PHP, allowing calling classes to be referenced in static contexts rather than defining classes. 1) The parsing process is performed at runtime, 2) Look up the call class in the inheritance relationship, 3) It may bring performance overhead.
What are PHP magic methods (__construct, __destruct, __call, __get, __set, etc.) and provide use cases?
Apr 03, 2025 am 12:03 AM
What are the magic methods of PHP? PHP's magic methods include: 1.\_\_construct, used to initialize objects; 2.\_\_destruct, used to clean up resources; 3.\_\_call, handle non-existent method calls; 4.\_\_get, implement dynamic attribute access; 5.\_\_set, implement dynamic attribute settings. These methods are automatically called in certain situations, improving code flexibility and efficiency.
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 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.
PHP: A Key Language for Web Development
Apr 13, 2025 am 12:08 AM
PHP is a scripting language widely used on the server side, especially suitable for web development. 1.PHP can embed HTML, process HTTP requests and responses, and supports a variety of databases. 2.PHP is used to generate dynamic web content, process form data, access databases, etc., with strong community support and open source resources. 3. PHP is an interpreted language, and the execution process includes lexical analysis, grammatical analysis, compilation and execution. 4.PHP can be combined with MySQL for advanced applications such as user registration systems. 5. When debugging PHP, you can use functions such as error_reporting() and var_dump(). 6. Optimize PHP code to use caching mechanisms, optimize database queries and use built-in functions. 7
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.
