- Prototype Tutorial
- Prototype - Home
- Prototype - Short Overview
- Prototype - Useful Features
- 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 - cleanWhitespace() Method
This method removes all of element's text nodes, which contain only whitespace and returns element.
Element.cleanWhitespace removes whitespace-only text nodes. This can be very useful when using standard methods like nextSibling, previousSibling, firstChild or lastChild to walk the DOM.
Syntax
element.cleanWhitespace();
Return Value
An HTML element
Example
Consider the following example −
<html> <head> <title>Prototype examples</title> <script type = "text/javascript" src = "/javascript/prototype.js"></script> <script> function showElements() { var element = $('apples'); alert(element.firstChild.innerHTML); } </script> </head> <body> <ul id = "apples"> <li>Mutsu</li> <li>McIntosh</li> <li>Ida Red</li> </ul> <br /> <input type = "button" value = "showElements" onclick = "showElements();"/> </body> </html>
That doesn't seem to work to well. Why is that ? ul#apples's first child is actually a text node containing only whitespace that sits between <ul id = "apples"> and <li>Mutsu</li>.
Output
Now, let's use cleanWhitespace function and see the result −
<html> <head> <title>Prototype examples</title> <script type = "text/javascript" src = "/javascript/prototype.js"></script> <script> function showElements() { var element = $('apples'); element.cleanWhitespace(); alert(element.firstChild.innerHTML); } </script> </head> <body> <ul id = "apples"> <li>Mutsu</li> <li>McIntosh</li> <li>Ida Red</li> </ul> <br /> <input type = "button" value = "showElements" onclick = "showElements();"/> </body> </html>
Output
prototype_element_object.htm
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