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Using CAPTCHA - JavaScript disabled
Note: This form does not submit any data to anywhere. It is for demonstration purposes only.
This form uses server side scripting to check the Captcha device. There are no client side (JavaScript) checks - equivalent to using the form with JavaScript disabled.
Note that using an image has accessibility issues, unless an alternative (not used here) is provided for those users with images disabled (screen readers etc.)
See http://en.wikipedia.org/wiki/Captcha
for more information.
This example uses a single image to determine if the form-filler is human or machine. If the digits shown by the image are entered incorrectly, the message is not sent. In this demonstration, if the digits are wrong, an alert is given - but, in a "real" form, unlike here, no indication of failure should be given to the user.
