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From "Christofer Dutz" <>
Subject AW: How does the captcha valid. in forms work?
Date Mon, 07 Aug 2006 11:45:07 GMT
Hi Marco


As far as I understand it, the widget generates a string with the expected
value and gives this an id.

This is stored in the session. When rendering the widget to html an image
with the name capcha-{id}.jpg is requested. Cocoon now takes this id to
generate the image for that particular id containing the information in the
session. All the Validator has to do now is to compare the value entered
with the one stored in the session.


Hope I’m correct.




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Von: [] Im Auftrag von
Gesendet: Montag, 7. August 2006 10:54
Betreff: How does the captcha valid. in forms work?


I know how to put in in the form and make it work, but what I do not
understand is how it works, especially whats in the sitemap

you put like that in your form:
<fd:captcha id="captcha" required="true" length="5"> 
       <fd:datatype base="string"/>

<map:match pattern="captcha-*.jpg"> 
      <map:generate type="jx" src="documents/xml/captcha-image.xml">
        <map:parameter name="capt" value="{session-attr:captcha-{1}}"/>
      <map:serialize type="svg2jpeg"/>

does it mean this: <fd:captcha id="captcha" required="true" length="5">
calls that: <map:match pattern="captcha-*.jpg"> 
and what about this entry: value="{session-attr:captcha-{1}}" ??

A description of the whole process would be great....
Thank you

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