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HTML DOM createNodeIterator() Method
  • Last Updated : 23 Jul, 2020

The createNodeIterator() Method is used to create a node iterator and hence using that node iterator we can iterate over nodes.

Syntax:

const nodeIterator = document.createNodeIterator(root[, whatToShow[, filter]]);

Parameters:

  • root: The root node from which to begin the Node Iterator’s traversal.
  • whatToShow(Optional): This is an optional argument representing a bitmask created by combining the constant properties of NodeFilter. The following are the possible values of unsigned constant.
ConstantReturn ValueConstant Description
NodeFilter.SHOW_ALL

1



Shows all nodes.
NodeFilter.SHOW_COMMENT

128

Shows Comment nodes.
NodeFilter.SHOW_DOCUMENT

256

Shows Document nodes.
NodeFilter.SHOW_DOCUMENT_FRAGMENT

1024

Shows DocumentFragment nodes.
NodeFilter.SHOW_DOCUMENT_TYPE

512

Shows DocumentType nodes.
NodeFilter.SHOW_ELEMENT

1

Shows Element nodes.
NodeFilter.SHOW_PROCESSING_INSTRUCTION

64

Shows ProcessingInstruction nodes.
NodeFilter.SHOW_TEXT

4

Shows Text nodes.
  • filter(Optional): An object implementing the NodeFilter interface. Exp, NodeFilter.FILTER_ACCEPT.

Return Value: This method returns a node iterator.



Example: In this example, we will create a node iterator using this method and will iterate using the nextNode() method.




<!DOCTYPE HTML> 
<html>  
<head>
    <meta charset="UTF-8">
    <title>HTML | DOM createNodeIterator() Method
    </title>
</head>   
  
<body style="text-align:center;">
    <h1 style="color:green;">  
     GeeksforGeeks
    </h1
    <p
HTML | DOM createNodeIterator() Method
    </p>
  
    <button onclick = "Geeks()">
    Click Here
    </button>
    <p id="a"></p>
    <script
        var a = document.getElementById("a");
        function Geeks(){
           const nodeIterator = document.createNodeIterator(
                document.body,
                NodeFilter.SHOW_ELEMENT
                )
           console.log(nodeIterator)
             
            let nextNode=nodeIterator.nextNode();
            nextNode=nodeIterator.nextNode();
            a.innerHTML =
'Next Node content is : '+nextNode.textContent;
            console.log(nextNode);
}
</script>
</body>
</html>

Output:

Before Clicking Button:

After Clicking Button:

In the console: in Console, the node iterator and the next node can be seen.

Supported Browsers:

  • Google Chrome
  • Edge
  • Firefox
  • Safari
  • Opera
  • Internet Explorer
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