- Prototype Tutorial
- Prototype - Home
- Prototype - Short Overview
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- Prototype - Utility Methods
- Prototype - Element Object
- Prototype - Number Processing
- Prototype - Strings Processing
- Prototype - Array Processing
- Prototype - Hash processing
- Prototype - Basic Object
- Prototype - Templating
- Prototype - Enumerating
- Prototype - Event Handling
- Prototype - Form Management
- Prototype - JSON Support
- Prototype - AJAX Support
- Prototype - Expressing Ranges
- Prototype - Periodical Execution
- Prototype Useful Resources
- Prototype - Quick Guide
- Prototype - Useful Resources
- Prototype - Discussion
Prototype - empty() Method
This method tests whether element is empty (i.e., contains only whitespace).
Syntax
element.empty;
Return Value
If it finds that element is an empty one, then it returns true, otherwise false.
Example
<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
Output
prototype_element_object.htm
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