This method turns Adds a CSS class to element.
element.addClassName(className);
<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>
To understand it in better way you can Try it yourself.
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