TreeWalker

The TreeWalker.currentNode property represents the Node which the TreeWalker is currently pointing at.

The TreeWalker.filter read-only property returns the NodeFilter associated with the TreeWalker.

The TreeWalker.root read-only property returns the root Node that the TreeWalker traverses.

The TreeWalker.whatToShow read-only property returns a bitmask that indicates the types of nodes to show. Non-matching nodes are skipped, but their children may be included, if relevant.

The TreeWalker.firstChild() method moves the current Node to the first visible child of the current node, and returns the found child. If no such child exists, it returns null and the current node is not changed.

The TreeWalker.lastChild() method moves the current Node to the last visible child of the current node, and returns the found child. If no such child exists, it returns null and the current node is not changed.

The TreeWalker.nextNode() method moves the current Node to the next visible node in the document order, and returns the found node. If no such node exists, it returns null and the current node is not changed.

The TreeWalker.nextSibling() method moves the current Node to its next sibling, if any, and returns the found sibling. If there is no such node, it returns null and the current node is not changed.

The TreeWalker.parentNode() method moves the current Node to the first visible ancestor node in the document order, and returns the found node. If no such node exists, or if it is above the TreeWalker's root node, it returns null and the current node is not changed.

The TreeWalker.previousNode() method moves the current Node to the previous visible node in the document order, and returns the found node. If no such node exists, or if it is before that the root node defined at the object construction, it returns null and the current node is not changed.

The TreeWalker.previousSibling() method moves the current Node to its previous sibling, if any, and returns the found sibling. If there is no such node, it returns null and the current node is not changed.