DHTML and CSS CAPTCHA
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This class can be used to implement CAPTCHA validation using colored boxes that the user must click which are validated using AJAX requests.
It renders a grid of boxes on which only one box is colored differently to indicate the user must click it.
The class sends an AJAX request to the server passing the coordinates of the user clicks until a given number of clicks correctly point to the colored boxes.
It renders a grid of boxes on which only one box is colored differently to indicate the user must click it.
The class sends an AJAX request to the server passing the coordinates of the user clicks until a given number of clicks correctly point to the colored boxes.
| Classes of Alexander Selifonov | > | DHTML and CSS CAPTCHA | > | Download .zip .tar.gz | > |  Support forum (7) |
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Validation | Validation algorithms | View top rated classes |
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Security | Security protection and attack detection | View top rated classes |
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AJAX | Interact with the Web server without page reloading | View top rated classes |
| Innovation Award | ||
 March 2008 Number 2 Prize: One downloadable copy of PhpED Professional |
CAPTCHA is the name of an approach used to distinguish site accesses performed by real humans from robot script accesses. Usually the pages show fuzzy pictures with letters that the user needs to guess. However there are smart anti-CAPTCHA robots that can also guess what is written in CAPTCHA picture. This package provides an alternative CAPTCHA solution that consists in using colored boxes that the user must click in order to have access to the protected site resources. Since this is a new approach, it is harder to break by people that employ common anti-CAPTCHA scripts. Manuel Lemos |
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| Trackback links | ||
| Link | Description |
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| Ca(p)tch(a) me | Captchas sind eine feine Sache... |
| Applications that use this class | ||
| Link | Description |
|---|---|
| guest book | Historical Reconstruction workshop Sd-Recons |
| kvn.baikal.ru | Russian Humor contest community |
If you know an application of this package, send a message to the author to add a link here.| Files |
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| File | Role | Description |
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| as_snipercaptcha.php |
Class | Main class file |
| as_snipercaptcha_j.php |
Class | jQuery version of a main class |
  as_snipercaptcha.en.htm |
Doc. | Documentation (English) |
| as_snipercaptcha.ru.htm |
Doc. | Documentation (Russian) |
| cap_progress.png |
Icon | image for showing progress bar |
| as_jsfunclib.js |
Data | javascript function set needed by class |
| captchasight.png |
Icon | image for marking table cells |
| captcha_init.gif |
Icon | image used for "init" link |
| captcha_styles.css |
Data | styles for drawing CAPTCHA block |
| empty.gif |
Icon | empty (transparent pixel) image |
| sample.php |
Example | using class sample |
| Download all files: as_snipercaptcha.tar.gz as_snipercaptcha.zip |
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