This method returns element's id attribute if it exists, or sets and returns a unique, auto-generated id.
element.identify();
<html> <head> <title>Prototype examples</title> <script type="text/javascript" src="/javascript/prototype.js"> </script> <script> function showResult(){ var str = $('apple').identify(); alert("Apple's ID: " + str ); var str = $('apple').next().identify() alert("Orange's ID: " + str ); } </script> </head> <body> <p>Click the button to see the result.</p> <ul> <li id="apple">apple</li> <li>orange</li> </ul> <br /> <input type="button" value="Click" onclick="showResult();"/> </body> </html>
To understand it in better way you can Try it yourself.
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