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Reduce Spam using CAPTCHA

Using CAPTCHA techniques to stop spam


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. The validation checks that the text box near the image contains the digits depicted in the image.

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 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. In a "real" form, unlike here, server side scripting would present a random image - either produced on the fly or selected from a (large) number of images.


Note:  This form does not submit any data to anywhere. It is for demonstration purposes only.

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