В процессе перевода.

Объект TreeWalker представляет узлы поддерева документа и позицию внутри них.

TreeWalker может быть создан с использованием метода Document.createTreeWalker()

Свойства

Этот интерфейс не наследует никакого свойства.

TreeWalker.root Только для чтения
Возвращает Node представляющий корневой узел, как указано когда TreeWalker был создан.
TreeWalker.whatToShow Только для чтения
Returns an unsigned long being a bitmask made of constants describing the types of Node that must be presented. Non-matching nodes are skipped, but their children may be included, if relevant. The possible values are:
Constant Numerical value Description
NodeFilter.SHOW_ALL -1 (that is the max value of unsigned long) Показывает все узлы.
NodeFilter.SHOW_ATTRIBUTE 2 Shows attribute Attr nodes. This is meaningful only when creating a TreeWalker with an Attr node as its root. In this case, it means that the attribute node will appear in the first position of the iteration or traversal. Since attributes are never children of other nodes, they do not appear when traversing over the document tree.
NodeFilter.SHOW_CDATA_SECTION 8 Показывает CDATASection узлы.
NodeFilter.SHOW_COMMENT 128 Показывает Comment узлы.
NodeFilter.SHOW_DOCUMENT 256 Показывает Document узлы.
NodeFilter.SHOW_DOCUMENT_FRAGMENT 1024 Показывает DocumentFragment узлы.
NodeFilter.SHOW_DOCUMENT_TYPE 512 Показывает DocumentType узлы.
NodeFilter.SHOW_ELEMENT 1 Показывает Element узлы.
NodeFilter.SHOW_ENTITY 32 Показывает Entity узлы. This is meaningful only when creating a TreeWalker with an Entity node as its root; in this case, it means that the Entity node will appear in the first position of the traversal. Since entities are not part of the document tree, they do not appear when traversing over the document tree.
NodeFilter.SHOW_ENTITY_REFERENCE 16 Показывает EntityReference узлы.
NodeFilter.SHOW_NOTATION 2048 Показывает Notation nodes. This is meaningful only when creating a TreeWalker with a Notation node as its root; in this case, it means that the Notation node will appear in the first position of the traversal. Since entities are not part of the document tree, they do not appear when traversing over the document tree.
NodeFilter.SHOW_PROCESSING_INSTRUCTION 64 Показывает ProcessingInstruction узлы.
NodeFilter.SHOW_TEXT 4 Shows Text узлы.
TreeWalker.filter Только для чтения
Возвращает NodeFilter используемый для выбора соответствующих узлов.
TreeWalker.expandEntityReferences Только для чтения
Is a Boolean indicating, when discarding an EntityReference its whole sub-tree must be discarded at the same time.
TreeWalker.currentNode
Is the Node on which the TreeWalker is currently pointing at.

Методы

Этот интерфейс не наследует никакого метода.

Обратите внимание, что TreeWalker рассматривает только видимые узлы DOM.

TreeWalker.parentNode()
Moves the current Node to the first visible ancestor node in the document order, and returns the found node. It also moves the current node to this one. If no such node exists, or if it is before that the root node defined at the object construction, returns null and the current node is not changed.
TreeWalker.firstChild()
Moves the current Node to the first visible child of the current node, and returns the found child. It also moves the current node to this child. If no such child exists, returns null and the current node is not changed.
TreeWalker.lastChild()
Moves the current Node to the last visible child of the current node, and returns the found child. It also moves the current node to this child. If no such child exists, null is returned and the current node is not changed.
TreeWalker.previousSibling()
Moves the current Node to its previous sibling, if any, and returns the found sibling. If there is no such node, return null and the current node is not changed.
TreeWalker.nextSibling()
Moves the current Node to its next sibling, if any, and returns the found sibling. If there is no such node, null is returned and the current node is not changed.
TreeWalker.previousNode()
Moves the current Node to the previous visible node in the document order, and returns the found node. It also moves the current node to this one. If no such node exists, or if it is before that the root node defined at the object construction, returns null and the current node is not changed.
TreeWalker.nextNode()
Moves the current Node to the next visible node in the document order, and returns the found node. It also moves the current node to this one. If no such node exists, returns null and the current node is not changed.

Спецификации

Спецификация Статус Коометарий
DOM
Определение 'TreeWalker' в этой спецификации.
Живой стандарт Удалено свойство expandEntityReferences.
Document Object Model (DOM) Level 2 Traversal and Range Specification
Определение 'TreeWalker' в этой спецификации.
Устаревшая Начальное определение.

Совместимость с браузером

ВозможностьChromeEdgeFirefoxInternet ExplorerOperaSafari
Базовая поддержка1 Да4993
currentNode1 Да4993
expandEntityReferences1 Да4 — 21993
filter1 Да4993
root1 Да4993
whatToShow1 Да4993
firstChild1 Да4993
lastChild1 Да4993
nextNode1 Да4993
nextSibling1 Да4993
parentNode1 Да4993
previousNode1 Да4993
previousSibling1 Да4993
ВозможностьAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Базовая поддержка3 Да Да493 ?
currentNode3 Да Да493 ?
expandEntityReferences3 Да Да4 — 2193 ?
filter3 Да Да493 ?
root3 Да Да493 ?
whatToShow3 Да Да493 ?
firstChild3 Да Да493 ?
lastChild3 Да Да493 ?
nextNode3 Да Да493 ?
nextSibling3 Да Да493 ?
parentNode3 Да Да493 ?
previousNode3 Да Да493 ?
previousSibling3 Да Да493 ?

Смотрите также

Метки документа и участники

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