RSS reader for PHP and AJAX
RSS reader is used to read RSS information
Allows quick RSS viewing of news and updates
Ajax rss reader
In the following example of AJAX, we will show that the content of an RSS reader does not need to be refreshed when loading a webpage from RSS.
In the HTML form
This is an HTML webpage. It contains a simple HTML table and links to a JavaScript:
<Html><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>For example, the explanation-h tml form
As you can see, the HTML webpage contains a simple HTML form drop-down box.
The format of the work is as follows:
When an event is triggered, select an option in the drop-down list.
When the event-triggered function requires showRSS () to be executed.
The following form is a <div> so-called "rssOutput ". This is the showRSS () function returned as a placeholder. Reprinted please indicate from http://www.111cn.net/wy/yw.html
JavaScript
JavaScript code is stored in "getrss. js" and related HTML files:Var xmlHttpFunction 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 ;}For example
The stateChanged () and GetXmlHttpObject functions the same as the php ajax recommendation chapter.
This showRSS () function
Each selection is to perform this function in the input field as follows:
Defines the URL (file) transmitted to the server
Add the URL of a parameter (Q) and the selected options from the drop-down list
Add a random number to prevent the server from using cached files
Call the GetXmlHttpObject function to create an XMLHTTP object. The stateChanged change is triggered when it describes the functional requirements of the object.
The XMLHTTP object and specific website are opened.
Send an HTTP request to the server
PHP page
The JavaScript code required by the web server is a php file named "getrss. php ":<? Php // get the q parameter from URL $ q =$ _ GET ["q"];// Find out which feed was selectedif ($ q = "Google") {$ xml = ("http://news.google.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>") ;}?> Reprinted please indicate from http://www.111cn.net/wy/yw.html
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