Using Captcha component in XForms page

Vincent Bonamy wrote

Alessandro Vernet wrote:
> On Mon, Oct 5, 2009 at 4:24 PM, TirupatiReddy <manyamtirupati@yahoo.com> wrote:
>  
>>   We are using orbeon forms 3.7.1 developer release for our web
>> application.  We decided to use captcha component in our Registration Form.
>> But as for as I know Orbeon forms does not have the support for captcha
>> component i.e. it's not implemented in orbeon forms.
>>
>> So please can you guys give me some directions how I should do that?
>>    
>
> I would do this with an XBL component. In fact I was considering to do
> it at some point, but the weather must have been too sunny that
> particular day :). XBL is not super-complicated but you have to get
> into it. I recommend you start by having a look at the "Guide to Using
> and Writing XBL Components"
> (http://wiki.orbeon.com/forms/doc/developer-guide/xbl-components-guide).
> Then you can look at the source of some of the components that come
> with Orbeon Forms. You'll find those in:
> http://github.com/orbeon/orbeon-forms/tree/master/src/resources-packaged/xbl/orbeon/.
> And of course, let us know if you have any question.
>
> Alex
>  

Hi,

Below an example of a "Math Captcha" in XForms
(it would be nice if it could be embedded in a XBL component in Orbeon
Forms):


In the model :

  <xforms:instance id="captcha">
    <instance xmlns="">
      <value1/>
      <value2/>
      <sum/>
    </instance>
  </xforms:instance>

  <xforms:action ev:event="xforms-ready">
    <xforms:setvalue ref="instance('captcha')/value1"
value="xs:integer(random()*20)"/>
    <xforms:setvalue ref="instance('captcha')/value2"
value="xs:integer(random()*20)"/>
   </xforms:action>

      <xforms:bind nodeset="instance('captcha')/sum"
type="xs:positiveInteger" constraint="number(.) and
number(instance('captcha')/value1)+number(instance('captcha')/value2)=number(.)"/>



Next in the body :

      <xforms:group ref="xxforms:instance('captcha')">

    <fieldset>

      <legend>Math Captcha</legend>
     
      <div class="ori-category-help">Afin déviter des soumissions
automatisées et intensives réalisées par des robots malveillants, nous
vous demandons de bien vouloir répondre à cette simple question
mathématique avant de valider le formulaire.</div>

      <xforms:output ref="value1"/> + <xforms:output ref="value2"/>
      =
      <xforms:input ref="sum" incremental="true">
        <xforms:label class="hidden">Math Captcha</xforms:label>
        <xforms:alert>ne correspond pas à la somme attendue</xforms:alert>
      </xforms:input>

    </fieldset>

      </xforms:group>


Vincent.




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