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The TreeWalkerviewView is an interactive UI sample that displays the DOM tree. It show the progress of the tree traversal by moving the selection within the DOM tree. Buttons act as a control panel, allowing the user to interactively traverse the tree, remove nodes, add nodes, and view the results immediately in the tree.

The TreeWalkerviewView uses an example filter, NameNodeFilter, that can be controlled from the UI and a DOMTreeFull class that displays the full DOM tree with all the nodes.

The controls are called through to to the corresponding TreeWalker function. If you are familiar with the DOM Level 2 Traversal specification, these controls are fairly easy to understand.

Document Order Traversal Group
  • Next - calls the next() functions and selects the next in the tree.
  • Previous - calls the previous() function a and selects the previous node in the DOM tree.

Walk Group

Parent, Previous Sibling, Next Sibling, First Child, Last Child - call the corresponding function in TreeWalker and show the result as a selected Node.

Selected Node Group
  • current - set the current node to the selected node.
  • remove - remove the selected node and update the tree. You must press a button to see next or previous node selection.
  • add - add a text node. You must press a button to see next or previous node selection.

Filter Settings Group
  • createNodeTreeWalker - calls the factory method to create a new TreeWalker with the corresponding whatToShow and NodenameFilter settings. The selected node becomes the TreeWalker root.
  • whatToShow - you can singly or multiply select these values by pressing the control key and the TreeWalker is constrained to these types.
  • NodeNameFilter - an empty string is converted to null and given to the NodeNameFilter example filter class provided.
    • An empty string (null) matches ALL nodes.
    • A non-empty string is forced to match node names.

Running TreeWalker
java dom.traversal.TreeWalkerView <fileName>

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