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currentNode property (TreeWalker)

Browser support:

9

Sets or retrieves a reference to the node where the pointer of the TreeWalker is currently positioned.

Note: The TreeWalker object and its currentNode property are supported in Internet Explorer from version 9.

With the currentNode property you can set the current position of TreeWalker to a particular node.

Syntax:

object.currentNode;

You can find the related objects in the Supported by objects section below.

This property is read/write.

Possible values:

Reference to the node where the TreeWalker is positioned.

Default: this property has no default value.

Example HTML code 1:

This example illustrates the use of the currentNode property:

<head>
    <script type="text/javascript">
        function ElementChecker (node) {
            if (node.tagName.toLowerCase () == 'button') {
                return NodeFilter.FILTER_ACCEPT;
            }
            return NodeFilter.FILTER_SKIP;
        }

        function FindFirstButton () {
            if (document.createTreeWalker) {
                walker = document.createTreeWalker (document.body, NodeFilter.SHOW_ELEMENT, ElementChecker, false);

                    // get the first matching node
                var button = walker.firstChild ();              
                alert ("The label of the first button element:\n" + button.textContent);

                    // repeat the searching
                walker.currentNode = document.body;
                button = walker.firstChild ();              
                alert ("The label of the first button element:\n" + button.textContent);
            }
            else {
                alert ("Your browser does not support the createTreeWalker method!");
            }
        }
    </script>
</head>
<body>
    <button onclick="FindFirstButton ()">Find the first button tag with the TreeWalker object</button>
</body>