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本章演示一些基于 XML, HTML, XML DOM 和 JavaScript 构建的小型 XML 应用程序。
在本应用程序中,我们将使用 "cd_catalog.xml" 文件。
<?xml version="1.0" encoding="utf-8"?> <CATALOG> <CD> <TITLE>Empire Burlesque</TITLE> <ARTIST>Bob Dylan</ARTIST> <COUNTRY>USA</COUNTRY> <COMPANY>Columbia</COMPANY> <PRICE>10.90</PRICE> <YEAR>1985</YEAR> </CD> <CD> <TITLE>Unchain my heart</TITLE> <ARTIST>Joe Cocker</ARTIST> <COUNTRY>USA</COUNTRY> <COMPANY>EMI</COMPANY> <PRICE>8.20</PRICE> <YEAR>1987</YEAR> </CD> </CATALOG>
下面的实例从第一个 CD 元素中获取 XML 数据,然后在 id="showCD" 的 HTML 元素中显示数据。displayCD() 函数在页面加载时调用:
x=xmlDoc.getElementsByTagName("CD"); i=0; function displayCD() { artist=(x[i].getElementsByTagName("ARTIST")[0].childNodes[0].nodeValue); title=(x[i].getElementsByTagName("TITLE")[0].childNodes[0].nodeValue); year=(x[i].getElementsByTagName("YEAR")[0].childNodes[0].nodeValue); txt="Artist: " + artist + "<br />Title: " + title + "<br />Year: "+ year; document.getElementById("showCD").innerHTML=txt; } Artist: Bob Dylan Title: Empire Burlesque Year: 1985
为了向上面的实例添加导航(功能),需要创建 next() 和 previous() 两个函数:
function next() { // display the next CD, unless you are on the last CD if (i<x.length-1) { i++; displayCD(); } } function previous() { // displays the previous CD, unless you are on the first CD if (i>0) { i--; displayCD(); } }
最后的实例展示如何在用户点击某个 CD 项目时显示专辑信息:
<!DOCTYPE html> <html> <head> <script> if (window.XMLHttpRequest) {// code for IE7+, Firefox, Chrome, Opera, Safari xmlhttp=new XMLHttpRequest(); } else {// code for IE6, IE5 xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); } xmlhttp.open("GET","cd_catalog.xml",false); xmlhttp.send(); xmlDoc=xmlhttp.responseXML; x=xmlDoc.getElementsByTagName("CD"); function displayCDInfo(i) { artist=(x[i].getElementsByTagName("ARTIST")[0].childNodes[0].nodeValue); title=(x[i].getElementsByTagName("TITLE")[0].childNodes[0].nodeValue); year=(x[i].getElementsByTagName("YEAR")[0].childNodes[0].nodeValue); country=(x[i].getElementsByTagName("COUNTRY")[0].childNodes[0].nodeValue); company=(x[i].getElementsByTagName("COMPANY")[0].childNodes[0].nodeValue); price=(x[i].getElementsByTagName("PRICE")[0].childNodes[0].nodeValue); txt="Artist: "+artist+"<br>Title: "+title+"<br>Year: "+year+"<br>Country: "+country+"<br>Company: "+company+"<br>Price: "+price ; document.getElementById("showCD").innerHTML=txt; } </script> </head> <body> <div id='showCD'>Click on a CD to display album information.</div><br> <script> document.write("<table border='1'>"); for (var i=0;i<x.length;i++) { document.write("<tr onclick='displayCDInfo(" + i + ")'>"); document.write("<td>"); document.write(x[i].getElementsByTagName("ARTIST")[0].childNodes[0].nodeValue); document.write("</td><td>"); document.write(x[i].getElementsByTagName("TITLE")[0].childNodes[0].nodeValue); document.write("</td></tr>"); } document.write("</table>"); </script> </body> </html>
Bob Dylan | Empire Burlesque |
Bonnie Tyler | Hide your heart |
Dolly Parton | Greatest Hits |
Gary Moore | Still got the blues |
Eros Ramazzotti | Eros |
Bee Gees | One night only |
Dr.Hook | Sylvias Mother |
Rod Stewart | Maggie May |
Andrea Bocelli | Romanza |
Percy Sledge | When a man loves a woman |
Savage Rose | Black angel |
Many | 1999 Grammy Nominees |
Kenny Rogers | For the good times |
Will Smith | Big Willie style |
Van Morrison | Tupelo Honey |
Jorn Hoel | Soulsville |
Cat Stevens | The very best of |
Sam Brown | Stop |
T'Pau | Bridge of Spies |
Tina Turner | Private Dancer |
Kim Larsen | Midt om natten |
Luciano Pavarotti | Pavarotti Gala Concert |
Otis Redding | The dock of the bay |
Simply Red | Picture book |
The Communards | Red |
Joe Cocker | Unchain my heart |
如需了解更多关于使用 JavaScript 和 XML DOM 的信息,请访问我们的 XML DOM 教程。