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:

<!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>                                     

Output:
Before Click on the button:

After Click on the button:

Example 2:

<!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>                                        

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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