@xmldom/xmldom

Since version 0.7.0 this package is published to npm as @xmldom/xmldom and no longer as xmldom, because we are no longer able to publish xmldom.
For better readability in the docs, we will continue to talk about this library as "xmldom".

xmldom is a javascript ponyfill to provide the following APIs that are present in modern browsers to other runtimes:

• convert an XML string into a DOM tree

  new DOMParser().parseFromString(xml, mimeType) => Document

• create, access and modify a DOM tree

  new DOMImplementation().createDocument(...) => Document

• serialize a DOM tree back into an XML string

  new XMLSerializer().serializeToString(node) => string

The target runtimes xmldom supports are currently Node >= v14.6 (and very likely any other ES5 compatible runtime).

When deciding how to fix bugs or implement features, xmldom tries to stay as close as possible to the various related specifications/standards.
As indicated by the version starting with 0., this implementation is not feature complete and some implemented features differ from what the specifications describe.
Issues and PRs for such differences are always welcome, even when they only provide a failing test case.

This project was forked from it's original source in 2019, more details about that transition can be found in the CHANGELOG.

Usage

Install:

npm install @xmldom/xmldom

Example:

In NodeJS

const { DOMParser, XMLSerializer } = require('@xmldom/xmldom')

const source = `<xml xmlns="a">
	<child>test</child>
	<child/>
</xml>`

const doc = new DOMParser().parseFromString(source, 'text/xml')

const serialized = new XMLSerializer().serializeToString(doc)

Note: in Typescript ~~and ES6~~ (see #316) you can use the import approach, as follows:

import { DOMParser } from '@xmldom/xmldom'

API Reference

• DOMParser:

  parseFromString(xmlsource, mimeType)

  • options extension by xmldom (not DOM standard!!)

  // the options argument can be used to modify behavior
  // for more details check the documentation on the code or type definition  
  new DOMParser(options)

• XMLSerializer

  serializeToString(node)

DOM level2 method and attribute:

• Node

  readonly class properties (aka NodeType),
  these can be accessed from any Node instance node:
  if (node.nodeType === node.ELEMENT_NODE) {...

  1. ELEMENT_NODE (1)
  2. ATTRIBUTE_NODE (2)
  3. TEXT_NODE (3)
  4. CDATA_SECTION_NODE (4)
  5. ENTITY_REFERENCE_NODE (5)
  6. ENTITY_NODE (6)
  7. PROCESSING_INSTRUCTION_NODE (7)
  8. COMMENT_NODE (8)
  9. DOCUMENT_NODE (9)
  10. DOCUMENT_TYPE_NODE (10)
  11. DOCUMENT_FRAGMENT_NODE (11)
  12. NOTATION_NODE (12)

  attribute:

  • nodeValue | prefix | textContent

  readonly attribute:

  • nodeName | nodeType | parentNode | parentElement | childNodes | firstChild | lastChild | previousSibling | nextSibling | attributes | ownerDocument | namespaceURI | localName | isConnected | baseURI

  method:

  • insertBefore(newChild, refChild)
  • replaceChild(newChild, oldChild)
  • removeChild(oldChild)
  • appendChild(newChild)
  • hasChildNodes()
  • cloneNode(deep)
  • normalize()
  • contains(otherNode)
  • getRootNode()
  • isEqualNode(otherNode)
  • isSameNode(otherNode)
  • isSupported(feature, version)
  • hasAttributes()

• DOMException

  extends the Error type thrown as part of DOM API.

  readonly class properties:

  • INDEX_SIZE_ERR (1)
  • DOMSTRING_SIZE_ERR (2)
  • HIERARCHY_REQUEST_ERR (3)
  • WRONG_DOCUMENT_ERR (4)
  • INVALID_CHARACTER_ERR (5)
  • NO_DATA_ALLOWED_ERR (6)
  • NO_MODIFICATION_ALLOWED_ERR (7)
  • NOT_FOUND_ERR (8)
  • NOT_SUPPORTED_ERR (9)
  • INUSE_ATTRIBUTE_ERR (10)
  • INVALID_STATE_ERR (11)
  • SYNTAX_ERR (12)
  • INVALID_MODIFICATION_ERR (13)
  • NAMESPACE_ERR (14)
  • INVALID_ACCESS_ERR (15)

  attributes:

  • code with a value matching one of the above constants.

• DOMImplementation

  method:

  • hasFeature(feature, version) (deprecated)
  • createDocumentType(qualifiedName, publicId, systemId)
  • createDocument(namespaceURI, qualifiedName, doctype)

• Document : Node

  readonly attribute:

  • doctype | implementation | documentElement

  method:

  • createElement(tagName)
  • createDocumentFragment()
  • createTextNode(data)
  • createComment(data)
  • createCDATASection(data)
  • createProcessingInstruction(target, data)
  • createAttribute(name)
  • createEntityReference(name)
  • getElementsByTagName(tagname)
  • importNode(importedNode, deep)
  • createElementNS(namespaceURI, qualifiedName)
  • createAttributeNS(namespaceURI, qualifiedName)
  • getElementsByTagNameNS(namespaceURI, localName)
  • getElementById(elementId)

• DocumentFragment : Node

• Element : Node

  readonly attribute:

  • tagName

  method:

  • getAttribute(name)
  • setAttribute(name, value)
  • removeAttribute(name)
  • getAttributeNode(name)
  • setAttributeNode(newAttr)
  • removeAttributeNode(oldAttr)
  • getElementsByTagName(name)
  • getAttributeNS(namespaceURI, localName)
  • setAttributeNS(namespaceURI, qualifiedName, value)
  • removeAttributeNS(namespaceURI, localName)
  • getAttributeNodeNS(namespaceURI, localName)
  • setAttributeNodeNS(newAttr)
  • getElementsByTagNameNS(namespaceURI, localName)
  • hasAttribute(name)
  • hasAttributeNS(namespaceURI, localName)

• Attr : Node

  attribute:

  • value

  readonly attribute:

  • name | specified | ownerElement

• NodeList

  readonly attribute:

  • length

  method:

  • item(index)

• NamedNodeMap

  readonly attribute:

  • length

  method:

  • getNamedItem(name)
  • setNamedItem(arg)
  • removeNamedItem(name)
  • item(index)
  • getNamedItemNS(namespaceURI, localName)
  • setNamedItemNS(arg)
  • removeNamedItemNS(namespaceURI, localName)

• CharacterData : Node

  method:

  • substringData(offset, count)
  • appendData(arg)
  • insertData(offset, arg)
  • deleteData(offset, count)
  • replaceData(offset, count, arg)

• Text : CharacterData

  method:

  • splitText(offset)

• CDATASection

• Comment : CharacterData

• DocumentType

  readonly attribute:

  • name | entities | notations | publicId | systemId | internalSubset

• Notation : Node

  readonly attribute:

  • publicId | systemId

• Entity : Node

  readonly attribute:

  • publicId | systemId | notationName

• EntityReference : Node

• ProcessingInstruction : Node

  attribute:

  • data readonly attribute:
  • target

DOM level 3 support:

• Node

  attribute:

  • textContent

  method:

  • isDefaultNamespace(namespaceURI)
  • lookupNamespaceURI(prefix)

DOM extension by xmldom

• [Node] Source position extension;

  attribute:

  • lineNumber //number starting from 1
  • columnNumber //number starting from 1

Specs

The implementation is based on several specifications:

DOM Parsing and Serialization

From the W3C DOM Parsing and Serialization (WD 2016) xmldom provides an implementation for the interfaces:

• DOMParser
• XMLSerializer

Note that there are some known deviations between this implementation and the W3 specifications.

Note: The latest version of this spec has the status "Editors Draft", since it is under active development. One major change is that the definition of the DOMParser interface has been moved to the HTML spec

DOM

The original author claims that xmldom implements [DOM Level 2] in a "fully compatible" way and some parts of [DOM Level 3], but there are not enough tests to prove this. Both Specifications are now superseded by the [DOM Level 4 aka Living standard] wich has a much broader scope than xmldom. In the past, there have been multiple (even breaking) changes to align xmldom with the living standard, so if you find a difference that is not documented, any contribution to resolve the difference is very welcome (even just reporting it as an issue).

xmldom implements the following interfaces:

• Attr
• CDATASection
• CharacterData
• Comment
• Document
• DocumentFragment
• DocumentType
• DOMException
• DOMImplementation
• Element
• Entity
• EntityReference
• LiveNodeList
• NamedNodeMap
• Node
• NodeList
• Notation
• ProcessingInstruction
• Text

more details are available in the (incomplete) API Reference section.

HTML

xmldom does not have any goal of supporting the full spec, but it has some capability to parse, report and serialize things differently when it is told to parse HTML (by passing the HTML namespace).

SAX, XML, XMLNS

xmldom has an own SAX parser implementation to do the actual parsing, which implements some interfaces in alignment with the Java interfaces SAX defines:

• XMLReader
• DOMHandler

There is an idea/proposal to make it possible to replace it with something else in https://github.com/xmldom/xmldom/issues/55