Prototype - addClassName() Method

This method Adds a CSS class to element.

Syntax

element.addClassName(className);

Return Value

An HTML element in which CSS class is added.

Example

<html>
   <head>
      <title>Prototype examples</title>
      <script type="text/javascript" src = "/javascript/prototype.js"></script>
      
      <script>
         function addClass() {
            node = $("firstDiv");
            node.addClassName("title");
         }
      </script>
   </head>

   <style type = "text/css">
      .title {
         color:#36C;
         font-size:20px;
      }
   </style>
   
   <body>
      <div id = "firstDiv">
         <p>This is first paragraph</p> 
      </div>
      <br />
      
      <input type = "button" value = "Add Class" onclick = "addClass();"/>
   </body>
</html>

Output

prototype_element_object.htm