JSDoc: Home

Time 2020-12-26 16:04:45

Web Name: JSDoc: Home

WebSite: http://cheerio.js.org

ID:146856

Keywords:

JSDoc,Home,

Description:

cheerioFast, flexible & lean implementation of core jQuery designed specifically for the server. 中文文档 (Chinese Readme)const cheerio = require('cheerio');const $ = cheerio.load(' h2 >Hello world /h2>');$('h2.title').text('Hello there!');$('h2').addClass('welcome');$.html();//=> html> head> /head> body> h2 >Hello there! /h2> /body> /html>We are currently working on the 1.0.0 release of cheerio on the main branch. The source code for the last published version, 0.22.0, can be found here.Installationnpm install cheerioFeatures❤ 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.❁ Incredibly flexible:Cheerio wraps around parse5 parser and can optionally use @FB55's forgiving htmlparser2. Cheerio can parse nearly any HTML or XML document.Cheerio is not a web browserCheerio 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 Puppeteer or JSDom.Markup example we'll be using: ul id= fruits > li >Apple /li> li >Orange /li> li >Pear /li> /ul>This is the HTML markup we will be using in all of the API examples.LoadingFirst 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');const $ = cheerio.load(' ul id= fruits >... /ul>');$.html();//=> html> head> /head> body> ul id= fruits >... /ul> /body> /html>Similar to web browser contexts, load will introduce html , head , and body elements if they are not already present. You can set load's third argument to false to disable this.const $ = cheerio.load(' ul id= fruits >... /ul>', null, false);$.html();//=> ' ul id= fruits >... /ul>'Optionally, you can also load in the HTML by passing the string as the context:const $ = require('cheerio');$('ul', ' ul id= fruits >... /ul>');Or as the root:const $ = require('cheerio');$('li', 'ul', ' ul id= fruits >... /ul>');If you need to modify parsing options for XML input, you may pass an extraobject 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. When xml is set, the default options are:{ xmlMode: true, decodeEntities: true, // Decode HTML entities. withStartIndices: false, // Add a `startIndex` property to nodes. withEndIndices: false, // Add an `endIndex` property to nodes.For a full list of options and their effects, see this andhtmlparser2's options.Some users may wish to parse markup with the htmlparser2 library, andtraverse/manipulate the resulting structure with Cheerio. This may be the casefor those upgrading from pre-1.0 releases of Cheerio (which relied onhtmlparser2), for those dealing with invalid markup (because htmlparser2 ismore forgiving), or for those operating in performance-critical situations(because htmlparser2 may be faster in some cases). Note that more forgiving means htmlparser2 has error-correcting mechanisms that aren't always a matchfor the standards observed by web browsers. This behavior may be useful whenparsing non-HTML content.To support these cases, load also accepts a htmlparser2-compatible datastructure as its first argument. Users may install htmlparser2, use it toparse input, and pass the result to load:// Usage as of htmlparser2 version 3:const htmlparser2 = require('htmlparser2');const dom = htmlparser2.parseDOM(document, options);const $ = cheerio.load(dom);SelectorsCheerio'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[ ').html();//=> OrangeXML NamespacesYou can select with XML Namespaces but due to the CSS specification, the colon (:) needs to be escaped for the selector to be valid.$('[xml\\:id= main ');RenderingWhen you're ready to render the document, you can call the html method on the root selection:$.root().html();//=> html>// head> /head>// body>// ul id= fruits >// li >Apple /li>// li >Orange /li>// li >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 >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.PluginsOnce 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 objectCheerio collections are made up of objects that bear some resemblance to browser-based DOM nodes. You can expect them to define the following properties:tagNameparentNodepreviousSiblingnextSiblingnodeValuefirstChildchildNodeslastChildScreencastshttp://vimeo.com/31950192This 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.Cheerio in the real worldAre you using cheerio in production? Add it to the wiki!TestingTo run the test suite, download the repository, then within the cheerio directory, run:make setupmake testThis will download the development packages and run the test suite.SponsorsDoes your company use Cheerio in production? Please consider sponsoring this project. Your help will allow maintainers to dedicate more time and resources to its development and support.BackersBecome a backer to show your support for Cheerio and help us maintain and improve this open source project.Special ThanksThis 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.LicenseMIT Documentation generated by JSDoc 3.6.6 on Fri Dec 25 2020 20:36:55 GMT+0000 (Coordinated Universal Time)

TAGS:JSDoc Home 

<<< Thank you for your visit >>>

Hot Websites