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# DOMNodeIterator Class Reference

`DOMNodeIterators` are used to step through a set of nodes, e.g. More...

List of all members.

## Public Member Functions

Destructor
virtual | ~DOMNodeIterator ()
| Destructor.
Functions introduced in DOM Level 2
virtual DOMNode * | getRoot ()=0
| The `root` node of the `DOMNodeIterator`, as specified when it was created.
virtual unsigned long | getWhatToShow ()=0
| Return which node types are presented via the iterator.
virtual DOMNodeFilter * | getFilter ()=0
| The `DOMNodeFilter` used to screen nodes.
virtual bool | getExpandEntityReferences ()=0
| Return the expandEntityReferences flag.
virtual DOMNode * | nextNode ()=0
| Returns the next node in the set and advances the position of the `DOMNodeIterator` in the set.
virtual DOMNode * | previousNode ()=0
| Returns the previous node in the set and moves the position of the `DOMNodeIterator` backwards in the set.
virtual void | detach ()=0
| Detaches the `DOMNodeIterator` from the set which it iterated over, releasing any computational resources and placing the `DOMNodeIterator` in the INVALID state.
Non-standard Extension
virtual void | release ()=0
| Called to indicate that this NodeIterator is no longer in use and that the implementation may relinquish any resources associated with it.

## Protected Member Functions

Hidden constructors
| DOMNodeIterator ()
| DOMNodeIterator (const DOMNodeIterator &)

## Detailed Description

`DOMNodeIterators` are used to step through a set of nodes, e.g.

the set of nodes in a `DOMNodeList`, the document subtree governed by a particular `DOMNode`, the results of a query, or any other set of nodes. The set of nodes to be iterated is determined by the implementation of the `DOMNodeIterator`. DOM Level 2 specifies a single `DOMNodeIterator` implementation for document-order traversal of a document subtree. Instances of these `DOMNodeIterators` are created by calling `DOMDocumentTraversal``.createNodeIterator()`.

See also the Document Object Model (DOM) Level 2 Traversal and Range Specification.

Since:
  DOM Level 2

## Constructor & Destructor Documentation

DOMNodeIterator::DOMNodeIterator | ( |  | ) | `[protected]`

DOMNodeIterator::DOMNodeIterator | ( | const DOMNodeIterator & |  | ) | `[protected]`

virtual DOMNodeIterator::~DOMNodeIterator | ( |  | ) | `[virtual]`

Destructor.

## Member Function Documentation

virtual DOMNode* DOMNodeIterator::getRoot | ( |  | ) | `[pure virtual]`

The `root` node of the `DOMNodeIterator`, as specified when it was created.

Since:
  DOM Level 2

virtual unsigned long DOMNodeIterator::getWhatToShow | ( |  | ) | `[pure virtual]`

Return which node types are presented via the iterator.

This attribute determines which node types are presented via the `DOMNodeIterator`. The available set of constants is defined in the `DOMNodeFilter` interface. Nodes not accepted by `whatToShow` will be skipped, but their children may still be considered. Note that this skip takes precedence over the filter, if any.

Since:
  DOM Level 2

virtual DOMNodeFilter* DOMNodeIterator::getFilter | ( |  | ) | `[pure virtual]`

The `DOMNodeFilter` used to screen nodes.

Since:
  DOM Level 2

virtual bool DOMNodeIterator::getExpandEntityReferences | ( |  | ) | `[pure virtual]`

Return the expandEntityReferences flag.

The value of this flag determines whether the children of entity reference nodes are visible to the `DOMNodeIterator`. If false, these children and their descendants will be rejected. Note that this rejection takes precedence over `whatToShow` and the filter. Also note that this is currently the only situation where `DOMNodeIterators` may reject a complete subtree rather than skipping individual nodes.
To produce a view of the document that has entity references expanded and does not expose the entity reference node itself, use the `whatToShow` flags to hide the entity reference node and set `expandEntityReferences` to true when creating the `DOMNodeIterator`. To produce a view of the document that has entity reference nodes but no entity expansion, use the `whatToShow` flags to show the entity reference node and set `expandEntityReferences` to false.

Since:
  DOM Level 2

virtual DOMNode* DOMNodeIterator::nextNode | ( |  | ) | `[pure virtual]`

Returns the next node in the set and advances the position of the `DOMNodeIterator` in the set.

After a `DOMNodeIterator` is created, the first call to `nextNode()` returns the first node in the set.

Returns:
  The next `DOMNode` in the set being iterated over, or `null` if there are no more members in that set.

Exceptions:

  | DOMException | INVALID_STATE_ERR: Raised if this method is called after the `detach` method was invoked.

Since:
  DOM Level 2

virtual DOMNode* DOMNodeIterator::previousNode | ( |  | ) | `[pure virtual]`

Returns the previous node in the set and moves the position of the `DOMNodeIterator` backwards in the set.

Returns:
  The previous `DOMNode` in the set being iterated over, or `null` if there are no more members in that set.

Exceptions:

  | DOMException | INVALID_STATE_ERR: Raised if this method is called after the `detach` method was invoked.

Since:
  DOM Level 2

virtual void DOMNodeIterator::detach | ( |  | ) | `[pure virtual]`

Detaches the `DOMNodeIterator` from the set which it iterated over, releasing any computational resources and placing the `DOMNodeIterator` in the INVALID state.

After `detach` has been invoked, calls to `nextNode` or `previousNode` will raise the exception INVALID_STATE_ERR.

Since:
  DOM Level 2

virtual void DOMNodeIterator::release | ( |  | ) | `[pure virtual]`

Called to indicate that this NodeIterator is no longer in use and that the implementation may relinquish any resources associated with it.

(release() will call detach() where appropriate)

Access to a released object will lead to unexpected result.

The documentation for this class was generated from the following file:

- DOMNodeIterator.hpp

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