HTML | DOM setNamedItem() Method

The setNamedItem() method is used to add a particular node to an attribute node using its name. These attribute nodes are collectively called as namedNodeMap. It can be accessed through a name. If a node is already present in the document, it will replace it and return the updated value. The setNamedItem() method requires a node as a parameter.

Syntax:

namedNodeMap.setNamedItem( node )

Parameter Value: This method contains single parameter node which is mandatory. This parameter is the node value which need to add or replace in namedNodeMap collection.



Example 1:

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<!DOCTYPE html> 
<html
    <head
        <title>
            DOM setNamedItem() Method
        </title>
          
        <style>
            .gfg {
                color:green;
                font-size: 40px;
            }
        </style>
    </head>
      
    <body>
        <h1 class="geeks1">GeeksforGeeks</h1>
        <h2 class="geeks2">DOM setNamedItem() Method</h2>
          
        <button onclick = "setNameItem()">
            Set Node
        </button>
          
        <script>
            function setNameItem() {
                  
                // It is used to fetch the text
                // present in class geeks1
                var one = 
                    document.getElementsByClassName("geeks1")[0]; 
                  
                // New class (geek) is created
                var geek = document.createAttribute("class"); 
                  
                // Passing value of gfg class into geek class
                geek.value = "gfg";                                 
                  
                // Updating the CSS property of geeks1
                // class to gfg class
                one.attributes.setNamedItem(geek);                     
            }
        </script>
    </body>
</html>                                    

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Output:
Before Click on the button:

After Click on the button:

Example 2:

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<!DOCTYPE html> 
<html
    <head
        <title>
            DOM setNamedItem() Method
        </title>
          
        <!-- Set CSS property to the element -->
        <style>
            .gfg {
                color:green;
                font-size: 40px;
            }
            .gfg1 {
                color:green;
                font-size: 40px;
            }
        </style>
    </head>
      
    <body style = "text-align:center">
          
        <h1>GeeksforGeeks</h1>
        <h2>DOM setNamedItem() Method</h2>
        <h3>Welcome to GeeksforGeeks</h3>
          
        <button onclick = "setNameItem()">
            Set Node
        </button>
          
        <script>
            function setNameItem() {
                  
                var one = 
                    document.getElementsByTagName("H1")[0]; 
                var geek = 
                    document.createAttribute("class"); 
                geek.value = "gfg";                             
                one.attributes.setNamedItem(geek);             
          
                var two = 
                    document.getElementsByTagName("H3")[0];
                var geek1 = 
                    document.createAttribute("class");
                geek1.value = "gfg1";
                two.attributes.setNamedItem(geek1); 
            }
        </script>
    </body>
</html>                                       

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Output:
Before Click on the button:

After Click on the button:

Supported Browsers: The browser supported by DOM setNamedItem() Method are listed below:

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


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