org.chenillekit.tapestry.core.components
Class Kaptcha

java.lang.Object
  org.apache.tapestry5.corelib.base.AbstractField
      org.chenillekit.tapestry.core.components.Kaptcha

All Implemented Interfaces:

ClientElement, Field

public class Kaptcha
extends AbstractField

A Captcha is a type of challenge-response test used in computing to ensure that the response is not generated by a computer. The process usually involves one computer (a server) asking a user to complete a simple test which the computer is able to generate and grade. Because other computers are unable to solve the CAPTCHA, any user entering a correct solution is presumed to be human. Thus, it is sometimes described as a reverse Turing test, because it is administered by a machine and targeted to a human, in contrast to the standard Turing test that is typically administered by a human and targeted to a machine. A common type of CAPTCHA requires that the user type letters or digits from a distorted image that appears on the screen.

This component based on kaptcha library and produce following HTML code:

 <span id="kaptcha1" class="ck-kaptcha">
   <img id="kaptcha1_kaptcha" class="ck-kaptcha" src="..."/>
   <input id="kaptcha1_input" class="ck-kaptcha" type="text" name="kaptcha1"/>
 </span>
 

so you can change the design by cascading style sheets by the "ck-kaptcha" class.
To use this component, you need the chenillekit-image library in you classpath.

Version:

$Id: Kaptcha.java 725 2010-11-03 19:40:03Z homburgs $

Constructor Summary

Kaptcha()

Method Summary

StreamResponse	onKaptchaImage(String kaptchaValue)
protected void	processSubmission(String elementName) Method implemented by subclasses to actually do the work of processing the submission of the form.

Methods inherited from class org.apache.tapestry5.corelib.base.AbstractField

createDefaultParameterBinding, decorateInsideField, getClientId, getControlName, getLabel, isDisabled, isRequired, putPropertyNameIntoBeanValidationContext, removePropertyNameFromBeanValidationContext, setDecorator, setFormSupport

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Kaptcha

public Kaptcha()

Method Detail

onKaptchaImage

@OnEvent(value="kaptchaEvent")
public StreamResponse onKaptchaImage(String kaptchaValue)

processSubmission

protected void processSubmission(String elementName)

Method implemented by subclasses to actually do the work of processing the submission of the form. The element's elementName property will already have been set. This method is only invoked if the field is not disabled.

Specified by:

processSubmission in class AbstractField

Parameters:

elementName - the name of the element (used to find the correct parameter in the request)