Document.createNodeIterator()
Returns a new NodeIterator
object.
Syntax
JavaScript
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var nodeIterator = document.createNodeIterator(root, whatToShow, filter);
Values
root
- The root node at which to begin the
NodeIterator
's traversal. whatToShow
Optional- Is an optional
unsigned long
representing a bitmask created by combining the constant properties ofNodeFilter
. It is a convenient way of filtering for certain types of node. It defaults to0xFFFFFFFF
representing theSHOW_ALL
constant.Constant Numerical value Description NodeFilter.SHOW_ALL
-1
(that is the max value ofunsigned long
)Shows all nodes. NodeFilter.SHOW_ATTRIBUTE
2
Shows attribute Attr
nodes. This is meaningful only when creating aTreeWalker
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
8
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
32
Shows Entity
nodes. This is meaningful only when creating aTreeWalker
with anEntity
node as its root; in this case, it means that theEntity
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
Shows EntityReference
nodes.NodeFilter.SHOW_NOTATION
2048
Shows Notation
nodes. This is meaningful only when creating aTreeWalker
with aNotation
node as its root; in this case, it means that theNotation
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
Shows ProcessingInstruction
nodes.NodeFilter.SHOW_TEXT
4
Shows Text
nodes. filter
Optional- An object implementing the
NodeFilter
interface; itsacceptNode()
method will be called for each node in the subtree based at root which is accepted as included by the whatToShow flag to determine whether or not to include it in the list of iterable nodes (a simple callback function may also be used instead). The method should return one ofNodeFilter.FILTER_ACCEPT
,NodeFilter.FILTER_REJECT
, orNodeFilter.FILTER_SKIP
. See the Example.
Note: Prior to Gecko 12.0 (Firefox 12.0 / Thunderbird 12.0 / SeaMonkey 2.9), this method accepted an optional fourth parameter (
entityReferenceExpansion
) that is not part of the DOM4 specification, and has therefore been removed. This parameter indicated whether or not the children of entity reference nodes were visible to the iterator. Since such nodes were never created in browsers, this paramater had no effect.Example
JavaScript
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var nodeIterator = document.createNodeIterator( document.body, NodeFilter.SHOW_ELEMENT, function(node) { return node.nodeName.toLowerCase() === 'p' ? NodeFilter.FILTER_ACCEPT : NodeFilter.FILTER_REJECT; } ); var pars = []; var currentNode; while (currentNode = nodeIterator.nextNode()) { pars.push(currentNode); }
Browser Compatibility
Supported in FF 3.5+, Chrome 1+, Opera 9+, Safari 3+, IE9+
See Also
Specifications
DOM Level 2 Traversal: NodeIterator
License
© 2016 Mozilla Contributors
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-us/docs/web/api/document/createnodeiterator