How to use JQuery selectors in Node.js

问题:

I'm trying to extract email info from HTML files in my hard drive.

If I load the file in firefox and run jQuerify bookmarklet I can use successfully the following selector/function

window.jQuery("a.iEmail").each(function(el) {
  console.log(window.jQuery(this).attr('href'))
});

But using this in Node.js is not working

var document = require("jsdom").jsdom(),
  script = document.createElement("script"),
  fs = require('fs');

fs.readFile('file_1.html', 'utf-8', function(err, data){
  if (err) {
    throw err;
  }

  // This output the document
  //console.log(data)

  var window = document.createWindow(data);

  script.src = 'http://code.jquery.com/jquery-1.4.2.js';
  script.onload = function() {
    console.log(window.jQuery.fn.jquery);
    // outputs: 1.4.2
    //console.log(window.jQuery);

    /*
     * This line works if i load the local file in firefox and execute
     * the jQuerify bookmarlet
     */
    window.jQuery("a.iEmail").each(function(el) {
      console.log(window.jQuery(this).attr('href'))
    });
  };
  document.head.appendChild(script);
});

回答1:

I now know what the problem is.

The html data, must be passed in the document creation call, so the code look like this:

var jsdom = require("jsdom"),
    fs = require('fs');

fs.readFile('file_1.html', 'utf-8', function(err, data){
  if (err) {
    throw err;
  }

  // This output the document
  //console.log(data)

  // HTML data should be in document creation call
  var document = jsdom.jsdom(data); // data is the html content
  var script = document.createElement("script");

  // HTML data SHOULD NOT be in window creation call
  var window = document.createWindow();

  script.src = 'http://code.jquery.com/jquery-1.4.2.js';
  script.onload = function() {
    console.log(window.jQuery.fn.jquery);
    // outputs: 1.4.2
    //console.log(window.jQuery);

    /*
     * This line works if i load the local file in firefox and execute
     * the jQuerify bookmarlet
     */
    window.jQuery("a.iEmail").each(function(el) {
      console.log(window.jQuery(this).attr('href'))
    });
  };
  document.head.appendChild(script);
});

回答2:

It's tough to use jquery with node.js but it's possible. Here's an implementation with jsdom:

var jsdom = require('jsdom').jsdom,
    sys = require('sys'),
    window = jsdom().createWindow();

jsdom.jQueryify(window, '/path/to/jquery.js', function (window, jquery) {
  window.jQuery('body').append("<div class='testing'>Hello World</div>");
  sys.puts(window.jQuery(".testing").text()); // outputs Hello World
});

For more info see:

http://blog.nodejitsu.com/jsdom-jquery-in-5-lines-on-nodejs

or:

Can I use jQuery with Node.js?

回答3:

Using Cheerio

Cheerio is a server implementation of core jQuery that is perfect for using selectors.

You can easily use the each function:

$('a.iEmail').each(function (i, elem) {
  console.log($(this).attr('href'));
});

Full example:

var fs = require('fs');
var cheerio = require('cheerio');

fs.readFile('file_1.html', 'utf-8', function (err, data) {
  if (err) {
    throw err;
  }

  var $ = cheerio.load(data);

  $('a.iEmail').each(function (i, elem) {
    console.log($(this).attr('href'));
  });
});

回答4:

jsdom supports jQuery with "official" way.

jsdom.env(string, [scripts], [config], callback);

Simple code:

var jsdom = require("jsdom"),
fs = require('fs');

fs.readFile('file_1.html', 'utf-8', function (err, data) {
    if (err) {
        throw err;
    }
    jsdom.env(data, ["http://code.jquery.com/jquery.js"], function (errors, window) {
        var $ = window.$;
        $("a.iEmail").each(function() {
            console.log(this.href)
        });
    })

}

https://github.com/tmpvar/jsdom#easymode