permapp/node_modules/node-html-parser

Fast HTML Parser

Fast HTML Parser is a very fast HTML parser. Which will generate a simplified DOM tree, with basic element query support.

Per the design, it intends to parse massive HTML files in lowest price, thus the performance is the top priority. For this reason, some malformatted HTML may not be able to parse correctly, but most usual errors are covered (eg. HTML4 style no closing <li>, <td> etc).

Install

npm install --save node-html-parser

Performance

Faster than htmlparser2!

node-html-parser:1.94548 ms/file ± 2.15709
libxmljs        :5.28893 ms/file ± 3.69863
htmlparser      :24.9625 ms/file ± 168.380
htmlparser2     :3.34011 ms/file ± 4.76959
parse5          :13.9589 ms/file ± 9.84068
high5           :6.98078 ms/file ± 4.47575

Tested with htmlparser-benchmark.

Usage

import { parse } from 'node-html-parser';

const root = parse('<ul id="list"><li>Hello World</li></ul>');

console.log(root.firstChild.structure);
// ul#list
//   li
//     #text

console.log(root.querySelector('#list'));
// { tagName: 'ul',
//   rawAttrs: 'id="list"',
//   childNodes:
//    [ { tagName: 'li',
//        rawAttrs: '',
//        childNodes: [Object],
//        classNames: [] } ],
//   id: 'list',
//   classNames: [] }
console.log(root.toString());
// <ul id="list"><li>Hello World</li></ul>
root.set_content('<li>Hello World</li>');
root.toString();	// <li>Hello World</li>

var HTMLParser = require('node-html-parser');

var root = HTMLParser.parse('<ul id="list"><li>Hello World</li></ul>');

HTMLElement Methods

parse(data[, options])

Parse given data, and return root of the generated DOM.

• data, data to parse

• options, parse options

  {
    lowerCaseTagName: false,  // convert tag name to lower case (hurt performance heavily)
    script: false,            // retrieve content in <script> (hurt performance slightly)
    style: false,             // retrieve content in <style> (hurt performance slightly)
    pre: false,               // retrieve content in <pre> (hurt performance slightly)
    comment: false            // retrieve comments (hurt performance slightly)
  }
  

HTMLElement#trimRight()

Trim element from right (in block) after seeing pattern in a TextNode.

HTMLElement#removeWhitespace()

Remove whitespaces in this sub tree.

HTMLElement#querySelectorAll(selector)

Query CSS selector to find matching nodes.

Note: only tagName, #id, .class selectors supported. And not behave the same as standard querySelectorAll() as it will stop searching sub tree after find a match.

HTMLElement#querySelector(selector)

Query CSS Selector to find matching node.

HTMLElement#appendChild(node)

Append a child node to childNodes

HTMLElement#insertAdjacentHTML(where, html)

parses the specified text as HTML and inserts the resulting nodes into the DOM tree at a specified position.

HTMLElement#setAttribute(key: string, value: string)

Set value to key attribute.

HTMLElement#removeAttribute(key: string)

Remove key attribute.

HTMLElement#getAttribute(key: string)

Get key attribute.

HTMLElement#exchangeChild(oldNode: Node, newNode: Node)

Exchanges given child with new child.

HTMLElement#removeChild(node: Node)

Remove child node.

HTMLElement#toString()

Same as outerHTML

HTMLElement#set_content(content: string | Node | Node[])

Set content. Notice: Do not set content of the root node.

HTMLElement Properties

HTMLElement#text

Get unescaped text value of current node and its children. Like innerText. (slow for the first time)

HTMLElement#rawText

Get escpaed (as-it) text value of current node and its children. May have & in it. (fast)

HTMLElement#structuredText

Get structured Text

HTMLElement#structure

Get DOM structure

HTMLElement#firstChild

Get first child node

HTMLElement#lastChild

Get last child node

HTMLElement#innerHTML

Get innerHTML.

HTMLElement#outerHTML

Get outerHTML.