NodeIterator
The NodeIterator
interface represents an iterator to traverse nodes of a DOM subtree in document order.
Syntax
A NodeIterator
can be created using the Document.createNodeIterator()
method, as follows:
const nodeIterator = document.createNodeIterator(root, whatToShow, filter);
Instance properties
This interface doesn't inherit any property.
NodeIterator.root
Read only-
Returns a
Node
representing the root node, as specified when theNodeIterator
was created. NodeIterator.whatToShow
Read only-
Returns an
unsigned long
bitmask that describes the types ofNode
to be matched. Non-matching nodes are skipped, but relevant child nodes may be included.The possible bitmask values are constants from the
NodeFilter
interface:Constant Numerical value Description NodeFilter.SHOW_ALL
4294967295
(that is the max value ofunsigned long
)Shows all nodes. NodeFilter.SHOW_ATTRIBUTE
Deprecated2
Shows attribute Attr
nodes. This is meaningful only when creating aNodeIterator
with anAttr
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
Deprecated8
Shows CDATASection
nodes.NodeFilter.SHOW_COMMENT
128
Shows Comment
nodes.NodeFilter.SHOW_DOCUMENT
256
Shows Document
nodes.NodeFilter.SHOW_DOCUMENT_FRAGMENT
1024
Shows DocumentFragment
nodes.NodeFilter.SHOW_DOCUMENT_TYPE
512
Shows DocumentType
nodes.NodeFilter.SHOW_ELEMENT
1
Shows Element
nodes.NodeFilter.SHOW_ENTITY
Deprecated32
Legacy, no longer used. NodeFilter.SHOW_ENTITY_REFERENCE
Deprecated16
Legacy, no longer used. NodeFilter.SHOW_NOTATION
Deprecated2048
Legacy, no longer used. NodeFilter.SHOW_PROCESSING_INSTRUCTION
64
Shows ProcessingInstruction
nodes.NodeFilter.SHOW_TEXT
4
Shows Text
nodes. NodeIterator.filter
Read only-
Returns a
NodeFilter
used to select the relevant nodes. NodeIterator.referenceNode
Read only Experimental-
Returns the
Node
to which the iterator is anchored. NodeIterator.pointerBeforeReferenceNode
Read only-
Returns a boolean indicating whether or not the
NodeIterator
is anchored before theNodeIterator.referenceNode
. Iffalse
, it indicates that the iterator is anchored after the reference node.
Instance methods
This interface doesn't inherit any method.
NodeIterator.detach()
Deprecated-
This is a legacy method, and no longer has any effect. Previously it served to mark a
NodeIterator
as disposed, so it could be reclaimed by garbage collection. NodeIterator.previousNode()
-
Returns the previous
Node
in the document, ornull
if there are none. NodeIterator.nextNode()
-
Returns the next
Node
in the document, ornull
if there are none.
Specifications
Specification |
---|
DOM Standard # interface-nodeiterator |
Browser compatibility
BCD tables only load in the browser
See also
- The creator method:
Document.createNodeIterator()
. - Related interface:
TreeWalker