public interface ElementTraversal
ElementTraversal
interface is a set of read-only attributes
which allow an author to easily navigate between elements in a document.
In conforming implementations of Element Traversal, all objects that
implement Element
must also implement the
ElementTraversal
interface. Four of the methods,
getFirstElementChild()
, getLastElementChild()
,
getPreviousElementSibling()
, and getNextElementSibling()
,
each return a live reference to another element with the defined
relationship to the current element, if the related element exists. The
fifth method, getChildElementCount()
, exposes the number of child
elements of an element, for preprocessing before navigation.
See also the Element Traversal Specification.
Modifier and Type | Method and Description |
---|---|
int |
getChildElementCount()
Returns the current number of element nodes that are children of this
element.
|
Element |
getFirstElementChild()
Returns the first child element node of this element.
|
Element |
getLastElementChild()
Returns the last child element node of this element.
|
Element |
getNextElementSibling()
Returns the next sibling element node of this element.
|
Element |
getPreviousElementSibling()
Returns the previous sibling element node of this element.
|
Element getFirstElementChild()
null
if this element has no child elements.Element getLastElementChild()
null
if this element has no child elements.Element getPreviousElementSibling()
null
if this element has no element sibling nodes that
come before this one in the document tree.Element getNextElementSibling()
null
if this element has no element sibling nodes that
come after this one in the document tree.int getChildElementCount()
0
if this element has no child nodes that are of
nodeType
1
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