【发布时间】:2011-11-09 10:29:42
【问题描述】:
我在 javascript 中遇到一些 XML 问题,如何只选择具有某些属性值的标签?
w3 schools 中的以下示例使用此 xml file:
<?xml version="1.0" encoding="ISO-8859-1"?>
<bookstore>
<book category="COOKING">
<title lang="en">Everyday Italian</title>
<author>Giada De Laurentiis</author>
<year>2005</year>
<price>30.00</price>
</book>
<book category="CHILDREN">
<title lang="en">Harry Potter</title>
<author>J K. Rowling</author>
<year>2005</year>
<price>29.99</price>
</book>
<book category="WEB">
<title lang="en">XQuery Kick Start</title>
<author>James McGovern</author>
<author>Per Bothner</author>
<author>Kurt Cagle</author>
<author>James Linn</author>
<author>Vaidyanathan Nagarajan</author>
<year>2003</year>
<price>49.99</price>
</book>
<book category="WEB">
<title lang="en">Learning XML</title>
<author>Erik T. Ray</author>
<year>2003</year>
<price>39.95</price>
</book>
</bookstore>
然后以下脚本获取价格标签中的所有文本并将其打印在新行上。
<html>
<body>
<script type="text/javascript">
function loadXMLDoc(dname){
if (window.XMLHttpRequest){
xhttp=new XMLHttpRequest();
}
else{
xhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xhttp.open("GET",dname,false);
xhttp.send("");
return xhttp.responseXML;
}
//getting the xml into a var to parse
xml=loadXMLDoc("books.xml");
//the path in question
path="/bookstore/book/price/text()" ////how can i change this to only select the prices of the books where the category="COOKING" ?
// code for IE
if (window.ActiveXObject){
var nodes=xml.selectNodes(path);
for (i=0;i<nodes.length;i++)
{
document.write(nodes[i].nodeValue);
document.write("<br />");
}
}
// code for Mozilla, Firefox, Opera, etc.
else if (document.implementation && document.implementation.createDocument){
var nodes=xml.evaluate(path, xml, null, XPathResult.ANY_TYPE,null);
var result=nodes.iterateNext();
while (result)
{
document.write(result.nodeValue + "<br />");
result=nodes.iterateNext();
}
}
</script>
</body>
</html>
是否可以更改路径,以便脚本仅打印价格标签的文本,其中父标签“book”的类别属性为“COOKING”(我在当前路径的脚本中添加了注释是我认为我需要改变,但我不知道如何)?
我真的被卡住了,似乎不知道如何获得它。任何帮助都会很棒:)
【问题讨论】:
标签: xml