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JavaScript & XML

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Jan 24.2007

I have a XML like this

[code]
<?xml version=”1.0″ encoding=”UTF-8″?>
<family>
<parent pos=”1″>
<name></name>
<birth></birth>
<death></death>
<fwife>
<name></name>
<birth></birth>
<death></death>
</fwife>
<sons>
<parent pos=”11″>
<name></name>
<birth></birth>
<death></death>
<fwife>
<name></name>
<birth></birth>
<death></death>
</fwife>
<sons>
…
</sons>
</parent>
</sons>
</parent>
</family>
[/code]

Someone could tell me a way to get a parent node based on the pos attribute with JavaScript, please?

I know that I can use the getAttribute and loop, but is there a more efficient way? This xml can become a very large file.
Cheers ?

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JavaScript

4 Comments(s) ↴

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@Orc_ScorcherJan 24.2007 — You can use XPath for tasks like this. An example to find the parent with pos="11" (assumes 'xml' is a reference to your XML document): var xpathExpr = "//parent[@pos = '11']"
try {
// Try DOM XPath first.
var node = xml.evaluate(xpathExpr, xml, null, XPathResult.FIRST_ORDERED_NODE_TYPE,
null).singleNodeValue
}
catch (e) {
try {
// Try IE's selectSingleNode method.
node = xml.selectSingleNode(xpathExpr)
}
catch (e) {
// Didn't work either, implement some fallback action here.
}
}
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@cyberowlauthorJan 25.2007 — Works like a charm Orc Scorcher. Thanks a lot. Don't want to annoy you but could you point me some site where this function is detailed?

I like to know exactly how it works. Have been looking around for it but didn't find a single reference in google.
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@cyberowlauthorJan 25.2007 — Hum, is there a similar string to get multiple nodes? I would like to retrieve all the wives that someone had. I put a property husband in the fwife tag.
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@Orc_ScorcherJan 25.2007 — [url=http://msdn2.microsoft.com/en-us/library/ms754523.aspx]Description of selectNodes[/url], has a link to selectSingleNode.

[url=http://www.w3.org/TR/DOM-Level-3-XPath/xpath.html#XPathEvaluator]Description of evaluate[/url] and the rest of the XPath DOM.

For XPath itself there are tons of tutorials on the net, pick one you like but make sure it describes XPath 1.0, not 2.0.
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