cheerio-htmlparser2
v1.0.3
Published
Tiny, fast, and elegant implementation of core jQuery designed specifically for the server
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31
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renzholyReadme
const cheerio = require('cheerio-htmlparser2');
const $ = cheerio.load('<h2 class="title">Hello world</h2>');
$('h2.title').text('Hello there!');
$('h2').addClass('welcome');
$.html();
//=> <html><head></head><body><h2 class="title welcome">Hello there!</h2></body></html>Installation
npm install cheerio-htmlparser2
Features
❤ Familiar syntax: Cheerio implements a subset of core jQuery. Cheerio removes all the DOM inconsistencies and browser cruft from the jQuery library, revealing its truly gorgeous API.
ϟ Blazingly fast: Cheerio works with a very simple, consistent DOM model. As a result parsing, manipulating, and rendering are incredibly efficient. Preliminary end-to-end benchmarks suggest that cheerio is about 8x faster than JSDOM.
❁ Incredibly flexible: Cheerio wraps around htmlparser2. Cheerio can parse nearly any HTML or XML document.
Cheerio is not a web browser
Cheerio parses markup and provides an API for traversing/manipulating the resulting data structure. It does not interpret the result as a web browser does. Specifically, it does not produce a visual rendering, apply CSS, load external resources, or execute JavaScript. If your use case requires any of this functionality, you should consider projects like PhantomJS or JSDom.
API
Markup example we'll be using:
<ul id="fruits">
<li class="apple">Apple</li>
<li class="orange">Orange</li>
<li class="pear">Pear</li>
</ul>This is the HTML markup we will be using in all of the API examples.
Loading
First you need to load in the HTML. This step in jQuery is implicit, since jQuery operates on the one, baked-in DOM. With Cheerio, we need to pass in the HTML document.
This is the preferred method:
const cheerio = require('cheerio-htmlparser2');
const $ = cheerio.load('<ul id="fruits">...</ul>');Optionally, you can also load in the HTML by passing the string as the context:
const $ = require('cheerio-htmlparser2');
$('ul', '<ul id="fruits">...</ul>');Or as the root:
const $ = require('cheerio-htmlparser2');
$('li', 'ul', '<ul id="fruits">...</ul>');If you need to modify parsing options for XML input, you may pass an extra
object to .load():
const $ = cheerio.load('<ul id="fruits">...</ul>', {
xml: {
normalizeWhitespace: true
}
});The options in the xml object are taken directly from htmlparser2, therefore any options that can be used in htmlparser2 are valid in cheerio as well. The default options are:
{
withDomLvl1: true,
normalizeWhitespace: false,
xmlMode: true,
decodeEntities: true
}For a full list of options and their effects, see this and htmlparser2's options.
Selectors
Cheerio's selector implementation is nearly identical to jQuery's, so the API is very similar.
$( selector, [context], [root] )
selector searches within the context scope which searches within the root scope. selector and context can be a string expression, DOM Element, array of DOM elements, or cheerio object. root is typically the HTML document string.
This selector method is the starting point for traversing and manipulating the document. Like jQuery, it's the primary method for selecting elements in the document, but unlike jQuery it's built on top of the CSSSelect library, which implements most of the Sizzle selectors.
$('.apple', '#fruits').text();
//=> Apple
$('ul .pear').attr('class');
//=> pear
$('li[class=orange]').html();
//=> OrangeXML Namespaces
You can select with XML Namespaces but due to the CSS specification, the colon (:) needs to be escaped for the selector to be valid.
$('[xml\\:id="main"');Rendering
When you're ready to render the document, you can call the html method on the "root" selection:
$.root().html();
//=> <html>
// <head></head>
// <body>
// <ul id="fruits">
// <li class="apple">Apple</li>
// <li class="orange">Orange</li>
// <li class="pear">Pear</li>
// </ul>
// </body>
// </html>If you want to render the outerHTML of a selection, you can use the html utility functon:
cheerio.html($('.pear'));
//=> <li class="pear">Pear</li>By default, html will leave some tags open. Sometimes you may instead want to render a valid XML document. For example, you might parse the following XML snippet:
const $ = cheerio.load('<media:thumbnail url="http://www.foo.com/keyframe.jpg" width="75" height="50" time="12:05:01.123"/>');... and later want to render to XML. To do this, you can use the 'xml' utility function:
$.xml();
//=> <media:thumbnail url="http://www.foo.com/keyframe.jpg" width="75" height="50" time="12:05:01.123"/>You may also render the text content of a Cheerio object using the text static method:
const $ = cheerio.load('This is <em>content</em>.');
cheerio.text($('body'));
//=> This is content.Plugins
Once you have loaded a document, you may extend the prototype or the equivalent fn property with custom plugin methods:
const $ = cheerio.load('<html><body>Hello, <b>world</b>!</body></html>');
$.prototype.logHtml = function() {
console.log(this.html());
};
$('body').logHtml(); // logs "Hello, <b>world</b>!" to the consoleThe "DOM Node" object
Cheerio collections are made up of objects that bear some resemblence to browser-based DOM nodes. You can expect them to define the following properties:
tagNameparentNodepreviousSiblingnextSiblingnodeValuefirstChildchildNodeslastChild
Screencasts
http://vimeo.com/31950192
This video tutorial is a follow-up to Nettut's "How to Scrape Web Pages with Node.js and jQuery", using cheerio instead of JSDOM + jQuery. This video shows how easy it is to use cheerio and how much faster cheerio is than JSDOM + jQuery.
Contributors
These are some of the contributors that have made cheerio possible:
project : cheerio
repo age : 2 years, 6 months
active : 285 days
commits : 762
files : 36
authors :
293 Matt Mueller 38.5%
133 Matthew Mueller 17.5%
92 Mike Pennisi 12.1%
54 David Chambers 7.1%
30 kpdecker 3.9%
19 Felix Böhm 2.5%
17 fb55 2.2%
15 Siddharth Mahendraker 2.0%
11 Adam Bretz 1.4%
8 Nazar Leush 1.0%
7 ironchefpython 0.9%
6 Jarno Leppänen 0.8%
5 Ben Sheldon 0.7%
5 Jos Shepherd 0.7%
5 Ryan Schmukler 0.7%
5 Steven Vachon 0.7%
4 Maciej Adwent 0.5%
4 Amir Abu Shareb 0.5%
3 [email protected] 0.4%
3 Andi Neck 0.4%
2 steve 0.3%
2 alexbardas 0.3%
2 finspin 0.3%
2 Ali Farhadi 0.3%
2 Chris Khoo 0.3%
2 Rob Ashton 0.3%
2 Thomas Heymann 0.3%
2 Jaro Spisak 0.3%
2 Dan Dascalescu 0.3%
2 Torstein Thune 0.3%
2 Wayne Larsen 0.3%
1 Timm Preetz 0.1%
1 Xavi 0.1%
1 Alex Shaindlin 0.1%
1 mattym 0.1%
1 Felix Böhm 0.1%
1 Farid Neshat 0.1%
1 Dmitry Mazuro 0.1%
1 Jeremy Hubble 0.1%
1 nevermind 0.1%
1 Manuel Alabor 0.1%
1 Matt Liegey 0.1%
1 Chris O'Hara 0.1%
1 Michael Holroyd 0.1%
1 Michiel De Mey 0.1%
1 Ben Atkin 0.1%
1 Rich Trott 0.1%
1 Rob "Hurricane" Ashton 0.1%
1 Robin Gloster 0.1%
1 Simon Boudrias 0.1%
1 Sindre Sorhus 0.1%
1 xiaohwan 0.1%Cheerio in the real world
Are you using cheerio in production? Add it to the wiki!
Testing
To run the test suite, download the repository, then within the cheerio directory, run:
make setup
make testThis will download the development packages and run the test suite.
Special Thanks
This library stands on the shoulders of some incredible developers. A special thanks to:
• @FB55 for node-htmlparser2 & CSSSelect:
Felix has a knack for writing speedy parsing engines. He completely re-wrote both @tautologistic's node-htmlparser and @harry's node-soupselect from the ground up, making both of them much faster and more flexible. Cheerio would not be possible without his foundational work
• @jQuery team for jQuery: The core API is the best of its class and despite dealing with all the browser inconsistencies the code base is extremely clean and easy to follow. Much of cheerio's implementation and documentation is from jQuery. Thanks guys.
• @visionmedia: The style, the structure, the open-source"-ness" of this library comes from studying TJ's style and using many of his libraries. This dude consistently pumps out high-quality libraries and has always been more than willing to help or answer questions. You rock TJ.
License
MIT