HTML | DOM setAttributeNode() Method

The setAttributeNode() method in HTML DOM is used to add the specified attribute node to an element. If the specified attribute is already present, then this method replaces it.

Syntax:

element.setAttributeNode(name)

Parameter: Onll one parameter is accepted name.Where name is the attribute node to be added. It is the required field.

Return Value: This method returns an attribute object which represents the replaced attribute node otherwise it returns null.

Example:

<!DOCTYPE html> 
<html> 
  
<head> 
    <title> 
      HTML DOM setAttributeNode Method 
    </title> 
    <style> 
        .gfg { 
            color: green; 
        } 
    </style> 
</head> 
  
<body style="text-align: center;"> 
    <h1 style="color:green;"> 
       GeeksforGeeks 
    </h1> 
  
    <h2> 
       DOM setAttributeNode Method 
    </h2> 
  
    <p id="p"> 
        A computer science portal for geeks. 
    </p> 
  
    <button onclick="Geeks()"> 
        Click Here! 
    </button> 
  
    <script> 
        function Geeks() { 
            //Get the paragraph to add attribute.  
            var doc = document.getElementById("p"); 
  
            //Creating a class attribute. 
            var attr = document.createAttribute("class"); 
  
            //Setting the value of class attribute. 
            attr.value = "gfg"; 
  
            //Adding class attribute to paragraph.  
            doc.setAttributeNode(attr); 
        } 
    </script> 
</body> 
  
</html> 

Output:

Before click on the button:
setAttributeNode

After click on the button:
setAttributeNode

Supported Browsers: The browser supported by setAttributeNode() method are listed below:

Google Chrome
Internet Explorer
Firefox
Opera
Safari

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