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Life-time learner's blog
If you want to have prevent spam in your website, you probably need to use captcha.
A CAPTCHA ( /ˈkæp.tʃə/) is a type of challenge-response test used in computing as an attempt to ensure that the response is generated by a human being. The process usually involves a computer asking a user to complete a simple test which the computer is able to grade. (Wikipedia)
You can see the examples of captchas on the pictures. Captcha is intended to protect the web site from spam, and it helps to avoid “unwanted” registrations, block robots. But it can also deter some “proper” users. As for me, I hate recognizing captchas!
What we need is a simple and user-friendly mechanism to detect robot. Fortunately there are plenty of different solutions for captchas on the internet!
Take a look at QapTcha – a simple, easy-to-use and intuitive captcha system. It needs human action instead of to read a hard text and it is a very lightweight jQuery plugin.
All you need is to drag the button from one side to another, and that makes it perfect for mobile devices.
Here I will show you an example of how we can embed this captcha into JSF web-application.