node-wgxpath

Wicked Good XPath is a fast implementation of document.createExpression and document.evaluate (DOM3-XPath) in pure Javascript.

Version

x.y.z: x.y refers to the Wicked Good XPath revision when wgxpath.install.js was built; z refers to any improvements to this package.

I'm pretty lazy, so I don't build Wicked Good XPath myself. When the pre-compiled wgxpath.install.js is updated, I'll update this package.

Installation

Install with npm:

npm install wgxpath

Make sure things are working:

node node_modules/wgxpath/word_of_the_day.js

Example

This example scrapes the Merriam-Webster Word of the Day. This code can also be found in word_of_the_day.js. Be sure to install jsdom 3.x before running the example.

1$ npm install jsdom@"<4"

1var wgxpath = require('wgxpath');
2var jsdom = require('jsdom');
3
4var url = 'http://www.merriam-webster.com/word-of-the-day/';
5var expressionString = '//*[@id="content"]/div[3]/ul/li[1]/strong';
6
7jsdom.env({
8  html: url,
9  done: function(errors, window) {
10    wgxpath.install(window);
11    var expression = window.document.createExpression(expressionString);
12    var result = expression.evaluate(window.document,
13        wgxpath.XPathResultType.STRING_TYPE);
14    console.log('The Word of the Day is "' + result.stringValue + '."');
15  }
16});