NodeHtmlParser

A forgiving HTML/XML/RSS parser written in JS for both the browser and NodeJS (yes, despite the name it works just fine in any modern browser). The parser can handle streams (chunked data) and supports custom handlers for writing custom DOMs/output.

Installing

npm install @nojaja/htmlparser

migration

 ### v1.7.6 -> v2.1

• DefaultHandler -> HtmlBuilder

• result field

  • attribs -> attributes
  • attribs:'data' -> attributes.data:'data'
  • script.type='sctipt' -> script.type='tag'

ex.

  script tag
        attribs: {
            language: 'javascript'
         },
         
          type: 'script'
   ->
        attributes: {
            language: [{
              data: 'javascript',
              type: 'text'
            }]
         },
         type: 'tag'       

Running Tests

Run tests under node:

node runtests.js

Run tests in browser:

View runtests.html in any browser

Usage In Node

var htmlparser = require("htmlparser");
var rawHtml = "Xyz <script language= javascript>var foo = '<<bar>>';< /  script><!--<!-- Waah! -- -->";
var handler = new htmlparser.HtmlBuilder(function (error, dom) {
	if (error)
		[...do something for errors...]
	else
		[...parsing done, do something...]
});
var parser = new htmlparser.Parser(handler);
parser.parseComplete(rawHtml);
sys.puts(sys.inspect(handler.dom, false, null));

Usage In Browser

var handler = new Tautologistics.NodeHtmlParser.HtmlBuilder(function (error, dom) {
	if (error)
		[...do something for errors...]
	else
		[...parsing done, do something...]
});
var parser = new Tautologistics.NodeHtmlParser.Parser(handler);
parser.parseComplete(document.body.innerHTML);
alert(JSON.stringify(handler.dom, null, 2));

Example output

[ { raw: 'Xyz ', data: 'Xyz ', type: 'text' }
  , { raw: 'script language= javascript'
  , data: 'script language= javascript'
  , type: 'tag'
  , name: 'script'
  , attributes: { language: [{
              data: 'javascript',
              type: 'text'
              }]
	    }
  , children: 
     [ { raw: 'var foo = \'<bar>\';<'
       , data: 'var foo = \'<bar>\';<'
       , type: 'text'
       }
     ]
  }
, { raw: '<!-- Waah! -- '
  , data: '<!-- Waah! -- '
  , type: 'comment'
  }
]

Example output

normal tag

<div></div>

[{'type': 'tag','name': 'div'}]

text

Xyz 

[{type: 'text',data: 'Xyz '}]

script tag

<script language= javascript>var foo = '<<bar>>';</ script> 

[{
  type: 'tag',
  name: 'script',
  attributes: {
    language: [{
      data: 'javascript',
      type: 'text'
    }]
  },
  children: [{
    data: 'var foo = \'<<bar>>\';',
    type: 'text'
  }],
}]

Tag in tag

<div><div>hoge</div></div>

[{
  'type': 'tag',
  'name': 'div',
  'children': [{
    'type': 'tag',
    'name': 'div',
    'children': [{
      'type': 'text',
      'data': 'hoge'
    }]
  }]
}]

comment tag

<!-- Waah! --> 

[{data: ' Waah! ',type: 'comment'}]

img tag

<img src='hoge'>

[{
  'type': 'tag',
  'name': 'img',
  attributes: {
    src: [{
      data: 'hoge',
      type: 'text'
    }]
  }
}]

not container

<div />

[{'type': 'tag', 'name': 'div'}]

Example output v2.1

normal tag

<div></div>

[{'type': 'tag','name': 'div',
  'parentNode': parent object,
  getElementById: function(id,recurse),
  getElementsByTagName: function(id,recurse,limit),
  getElementsByTagType: function(type,recurse,limit),
  getElements: function(options, recurse, limit),
  removeChild: function(element),
  createElement: function(type),
  appendChild: function(element),
  getAttribute: function(name),
  cloneElement: function(parentNode),
}]

mustache script tag

{{#if true}}<div>{{hoge}}</div>{{/if}}

[{
  'type': 'script',
  'langName': 'mustache',
  'name': 'if',
  'data': 'true',
  'children': [{
    'type': 'tag',
    'name': 'div',
    'children': [{
      'type': 'script',
      'langName': 'mustache',
      'data': 'hoge'
    }]
  }]
}]

singleMustache script tag

{#if true}<div>{hoge}</div>{/if}

[{
  'type': 'script',
  'langName': 'singleMustache',
  'name': 'if',
  'data': 'true',
  'children': [{
    'type': 'tag',
    'name': 'div',
    'children': [{
      'type': 'script',
      'langName': 'singleMustache',
      'data': 'hoge'
    }]
  }]
}]

Streaming To Parser

while (...) {
	...
	parser.parseChunk(chunk);
}
parser.done();	

Streaming To Parser in Node

fs.createReadStream('./path_to_file.html').pipe(parser);

Parsing RSS/Atom Feeds

new htmlparser.RssHandler(function (error, dom) {
	...
});

DefaultHandler Options

Usage

var handler = new htmlparser.HtmlBuilder(
	  function (error) { ... }
	, { verbose: false, ignoreWhitespace: true }
	);

Option: ignoreWhitespace

Indicates whether the DOM should exclude text nodes that consists solely of whitespace. The default value is "false".

Example: true

The following HTML:

<font>
	<br>this is the text
<font>

becomes:

[ { raw: 'font'
  , data: 'font'
  , type: 'tag'
  , name: 'font'
  , children: 
     [ { raw: 'br', data: 'br', type: 'tag', name: 'br' }
     , { raw: 'this is the text\n'
       , data: 'this is the text\n'
       , type: 'text'
       }
     , { raw: 'font', data: 'font', type: 'tag', name: 'font' }
     ]
  }
]

Example: false

The following HTML:

<font>
	<br>this is the text
<font>

becomes:

[ { raw: 'font'
  , data: 'font'
  , type: 'tag'
  , name: 'font'
  , children: 
     [ { raw: '\n\t', data: '\n\t', type: 'text' }
     , { raw: 'br', data: 'br', type: 'tag', name: 'br' }
     , { raw: 'this is the text\n'
       , data: 'this is the text\n'
       , type: 'text'
       }
     , { raw: 'font', data: 'font', type: 'tag', name: 'font' }
     ]
  }
]

Option: verbose

Indicates whether to include extra information on each node in the DOM. This information consists of the "raw" attribute (original, unparsed text found between "<" and ">") and the "data" attribute on "tag", "script", and "comment" nodes. The default value is "true".

Example: true

The following HTML:

<a href="test.html">xxx</a>

becomes:

[ { raw: 'a href="test.html"'
  , data: 'a href="test.html"'
  , type: 'tag'
  , name: 'a'
  , attribs: { href: 'test.html' }
  , children: [ { raw: 'xxx', data: 'xxx', type: 'text' } ]
  }
]

Example: false

The following HTML:

<a href="test.html">xxx</a>

becomes:

[ { type: 'tag'
  , name: 'a'
  , attribs: { href: 'test.html' }
  , children: [ { data: 'xxx', type: 'text' } ]
  }
]

Option: enforceEmptyTags

Indicates whether the DOM should prevent children on tags marked as empty in the HTML spec. Typically this should be set to "true" HTML parsing and "false" for XML parsing. The default value is "true".

Example: true

The following HTML:

<link>text</link>

becomes:

[ { raw: 'link', data: 'link', type: 'tag', name: 'link' }
, { raw: 'text', data: 'text', type: 'text' }
]

Example: false

The following HTML:

<link>text</link>

becomes:

[ { raw: 'link'
  , data: 'link'
  , type: 'tag'
  , name: 'link'
  , children: [ { raw: 'text', data: 'text', type: 'text' } ]
  }
]

DomUtils

TBD (see utils_example.js for now)

getElementById

var id = htmlparser.DomUtils.getElementById("x", dom);

getElementsByTagName

var name = htmlparser.DomUtils.getElementsByTagName("a", dom);

getElements

var clazz = htmlparser.DomUtils.getElements({class: "y" }, dom);

var multiclass = htmlparser.DomUtils.getElements({
          class: function(value) {
            console.log(value);
            return (value && value.indexOf("h") > -1);
          }
        }, dom);

getElementsByTagType

var nested = htmlparser.DomUtils.getElements({
          tag_name: "d",
          id: "z",
          class: "w"
        }, dom);

DomUtils v2.1

getElementById

var id = dom.getElementById("x");

getElementsByTagName

var name = dom.getElementsByTagName("a");

getElements

var clazz = dom.getElements({class: "y"});

getElementsByTagType

var nested = dom.getElements({ tag_name: "d", id: "z", class: "w" });

Related Projects

Loo king for CSS selectors to search the DOM? Try Node-SoupSelect, a port of SoupSelect to NodeJS: http://github.com/harryf/node-soupselect

There's also a port of hpricot to NodeJS that uses HtmlParser for HTML parsing: http://github.com/silentrob/Apricot