This method tests whether element is empty (i.e. contains only whitespace).
element.empty;
<html> <head> <title>Prototype examples</title> <script type="text/javascript" src="/javascript/prototype.js"> </script> <script> function showResult(){ if($('wallet').empty() ){ alert( "Wallet is empty " ); } if($('cart').empty() ){ alert( "Cart is full" ); } } </script> </head> <body> <p>Click the button to see the result.</p> <div id="wallet"> </div> <div id="cart">full!</div> <br /> <input type="button" value="showResult" onclick="showResult();"/> </body> </html>
In this example:
$('wallet').empty(); // -> true $('cart').empty(); // -> false
To understand it in better way you can Try it yourself.
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