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xpath

DOM 3 Xpath implemention and helper for node.js.

DOM 3 XPath 1.0 implemention and helper for JavaScript, with node.js support.

Originally written by Cameron McCormack (blog).

Additional contributions from
Yaron Naveh (blog)
goto100
Thomas Weinert
Jimmy Rishe
and others

Install with npm:

npm install xpath

xpath is xml engine agnostic but I recommend to use xmldom:

npm install xmldom
var xpath = require('xpath')
  , dom = require('xmldom').DOMParser
 
var xml = "<book><title>Harry Potter</title></book>"
var doc = new dom().parseFromString(xml)
var nodes = xpath.select("//title", doc)
 
console.log(nodes[0].localName + "" + nodes[0].firstChild.data)
console.log("node: " + nodes[0].toString())

title: Harry Potter
Node: <title>Harry Potter</title>
var xml = "<book><title>Harry Potter</title></book>"
var doc = new dom().parseFromString(xml)
var title = xpath.select("//title/text()", doc).toString()
 
console.log(title)

Harry Potter
var xml = "<book><title xmlns='myns'>Harry Potter</title></book>"
var doc = new dom().parseFromString(xml)
var node = xpath.select("//*[local-name(.)='title' and namespace-uri(.)='myns']", doc)[0]
 
console.log(node.namespaceURI)

myns
var xml = "<book xmlns:bookml='http://example.com/book'><bookml:title>Harry Potter</bookml:title></book>"
var select = xpath.useNamespaces({"bookml": "http://example.com/book"});
 
console.log(select('//bookml:title/text()', doc)[0].nodeValue);

Harry Potter
var xml = "<book xmlns='http://example.com/book'><title>Harry Potter</title></book>"
var select = xpath.useNamespaces({"bookml": "http://example.com/book"});
 
console.log(select('//bookml:title/text()', doc)[0].nodeValue);

Harry Potter
var xml = "<book author='J. K. Rowling'><title>Harry Potter</title></book>"
var doc = new dom().parseFromString(xml)
var author = xpath.select1("/book/@author", doc).value
 
console.log(author)

J. K. Rowling