| org.w3c.dom.traversal.TreeWalker
| TreeWalker | | public interface TreeWalker (Code) | | TreeWalker objects are used to navigate a document tree or
subtree using the view of the document defined by their
whatToShow flags and filter (if any). Any function which
performs navigation using a TreeWalker will automatically
support any view defined by a TreeWalker.
Omitting nodes from the logical view of a subtree can result in a
structure that is substantially different from the same subtree in the
complete, unfiltered document. Nodes that are siblings in the
TreeWalker view may be children of different, widely
separated nodes in the original view. For instance, consider a
NodeFilter that skips all nodes except for Text nodes and
the root node of a document. In the logical view that results, all text
nodes will be siblings and appear as direct children of the root node, no
matter how deeply nested the structure of the original document.
See also the Document Object Model (DOM) Level 2 Traversal and Range Specification.
since:
DOM Level 2 |
| Method Summary | |
| public Node | firstChild()
Moves the TreeWalker to the first visible child of the
current node, and returns the new node. | | public Node | getCurrentNode()
The node at which the TreeWalker is currently positioned.
Alterations to the DOM tree may cause the current node to no longer
be accepted by the TreeWalker's associated filter. | | public boolean | getExpandEntityReferences()
The value of this flag determines whether the children of entity
reference nodes are visible to the TreeWalker. | | public NodeFilter | getFilter()
The filter used to screen nodes. | | public Node | getRoot()
The root node of the TreeWalker, as specified
when it was created. | | public int | getWhatToShow()
This attribute determines which node types are presented via the
TreeWalker. | | public Node | lastChild()
Moves the TreeWalker to the last visible child of the
current node, and returns the new node. | | public Node | nextNode()
Moves the TreeWalker to the next visible node in document
order relative to the current node, and returns the new node. | | public Node | nextSibling()
Moves the TreeWalker to the next sibling of the current
node, and returns the new node. | | public Node | parentNode()
Moves to and returns the closest visible ancestor node of the current
node. | | public Node | previousNode()
Moves the TreeWalker to the previous visible node in
document order relative to the current node, and returns the new
node. | | public Node | previousSibling()
Moves the TreeWalker to the previous sibling of the
current node, and returns the new node. | | public void | setCurrentNode(Node currentNode)
The node at which the TreeWalker is currently positioned.
Alterations to the DOM tree may cause the current node to no longer
be accepted by the TreeWalker's associated filter. |
| firstChild | | public Node firstChild()(Code) | | Moves the TreeWalker to the first visible child of the
current node, and returns the new node. If the current node has no
visible children, returns null, and retains the current
node.
The new node, or null if the current node has no visible children in the TreeWalker's logical view. |
| getCurrentNode | | public Node getCurrentNode()(Code) | | The node at which the TreeWalker is currently positioned.
Alterations to the DOM tree may cause the current node to no longer
be accepted by the TreeWalker's associated filter.
currentNode may also be explicitly set to any node,
whether or not it is within the subtree specified by the
root node or would be accepted by the filter and
whatToShow flags. Further traversal occurs relative to
currentNode even if it is not part of the current view,
by applying the filters in the requested direction; if no traversal
is possible, currentNode is not changed.
|
| getExpandEntityReferences | | public boolean getExpandEntityReferences()(Code) | | The value of this flag determines whether the children of entity
reference nodes are visible to the TreeWalker. If false,
these children and their descendants will be rejected. Note that
this rejection takes precedence over whatToShow and the
filter, if any.
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
TreeWalker. 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.
|
| getRoot | | public Node getRoot()(Code) | | The root node of the TreeWalker, as specified
when it was created.
|
| getWhatToShow | | public int getWhatToShow()(Code) | | This attribute determines which node types are presented via the
TreeWalker. The available set of constants is defined in
the NodeFilter 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.
|
| lastChild | | public Node lastChild()(Code) | | Moves the TreeWalker to the last visible child of the
current node, and returns the new node. If the current node has no
visible children, returns null, and retains the current
node.
The new node, or null if the current node has no children in the TreeWalker's logical view. |
| nextNode | | public Node nextNode()(Code) | | Moves the TreeWalker to the next visible node in document
order relative to the current node, and returns the new node. If the
current node has no next node, or if the search for nextNode attempts
to step upward from the TreeWalker's root
node, returns null, and retains the current node.
The new node, or null if the current node has no next node in the TreeWalker's logical view. |
| nextSibling | | public Node nextSibling()(Code) | | Moves the TreeWalker to the next sibling of the current
node, and returns the new node. If the current node has no visible
next sibling, returns null, and retains the current node.
The new node, or null if the current node has no next sibling. in the TreeWalker's logical view. |
| parentNode | | public Node parentNode()(Code) | | Moves to and returns the closest visible ancestor node of the current
node. If the search for parentNode attempts to step
upward from the TreeWalker's root node, or
if it fails to find a visible ancestor node, this method retains the
current position and returns null.
The new parent node, or null if the current node has no parent in the TreeWalker's logical view. |
| previousNode | | public Node previousNode()(Code) | | Moves the TreeWalker to the previous visible node in
document order relative to the current node, and returns the new
node. If the current node has no previous node, or if the search for
previousNode attempts to step upward from the
TreeWalker's root node, returns
null, and retains the current node.
The new node, or null if the current node has no previous node in the TreeWalker's logical view. |
| previousSibling | | public Node previousSibling()(Code) | | Moves the TreeWalker to the previous sibling of the
current node, and returns the new node. If the current node has no
visible previous sibling, returns null, and retains the
current node.
The new node, or null if the current node has no previous sibling. in the TreeWalker's logical view. |
| setCurrentNode | | public void setCurrentNode(Node currentNode) throws DOMException(Code) | | The node at which the TreeWalker is currently positioned.
Alterations to the DOM tree may cause the current node to no longer
be accepted by the TreeWalker's associated filter.
currentNode may also be explicitly set to any node,
whether or not it is within the subtree specified by the
root node or would be accepted by the filter and
whatToShow flags. Further traversal occurs relative to
currentNode even if it is not part of the current view,
by applying the filters in the requested direction; if no traversal
is possible, currentNode is not changed.
exception:
DOMException - NOT_SUPPORTED_ERR: Raised if an attempt is made to set currentNode to null. |
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