Order of xforms-recalculate and xforms-revalidate events

I'm relatively new to Orbeon and XForms in general, and I'm stumped by a seemingly simple problem. I've created the following test form:

<xhtml:html                                                                                                                                                                                                            xmlns:xforms="http://www.w3.org/2002/xforms"                                                                                                                                                                       xmlns:xhtml="http://www.w3.org/1999/xhtml"                                                                                                                                                                    
    xmlns:xs="http://www.w3.org/2001/XMLSchema">                                                                                                                                                                  
    <xhtml:head>                                                                                                                                                                                                  
        <xhtml:title>Validation-Calculation-Order</xhtml:title>                                                                                                                                                    
        <xforms:model>                                                                                                                                                                                            
            <xforms:instance id="example" xmlns="">                                                                                                                                                                                <example>                                                                                                                                                                                                              <value1>10</value1>                                                                                                                                                                            
                    <value2>10</value2>                                                                                                                                                                                                <value3>100</value3>                                                                                                                                                                          
                </example>                                                                                                                                                                                        
            </xforms:instance>                                                                                                                                                                                    
            <xforms:bind nodeset="value1" type="xs:integer"/>                                                                                                                                                                  <xforms:bind nodeset="value2" type="xs:integer"/>                                                                                                                                                                  <xforms:bind nodeset="value3" type="xs:integer" calculate="../value1 * ../value2"/>                                                                                                                    
        </xforms:model>                                                                                                                                                                                            
    </xhtml:head>                                                                                                                                                                                                  
    <xhtml:body>                                                                                                                                                                                                  
        <xforms:input ref="value1"/>                                                                                                                                                                              
        <xforms:input ref="value2"/>                                                                                                                                                                              
        <xforms:output ref="value3"/>                                                                                                                                                                              
    </xhtml:body>                                                                                                                                                                                                  
</xhtml:html>

Basically, the idea is to recalculate value3 whenever the user changes value1 or value2. The problem is that, if the users enters a value that is not numeric, I get a 'Failure converting untyped value "a" to a number' after evaluation of the calculate bind. So the question is, how can I force revalidation to occur before recalculation without resorting to xforms:setvalue and the likes?

Cheers,

Darth


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Hi,

Perhaps the XPath 2.0 castable function, so that the calculation is not
attempted if the content is not valid.

   calculate="if ((../value1 castable as xs:integer) and (../value2  
castable as xs:integer))
      ../value1 * ../value2"

(hopefully this code works, if you grep for castable in the source  
examples, you will
see others known to work...)

http://www.w3.org/TR/xpath20/#id-castable

Cheers,
Hank

On Jun 26, 2008, at 7:45 AM, Robby Cornelissen wrote:
Hank Ratzesberger
NEES@UCSB
Institute for Crustal Studies,
University of California, Santa Barbara
805-893-8042







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Yes, that's the idea. A little annoying but I am not sure there is a  
better way to avoid conversion errors at the moment.

However I don't think we should propagate dynamic JS errors to the  
client the way we do now. We need to check this. The issue is that w/  
XForms/XPath 1.0, this can't really happen, but in XPath 2.0 more  
dynamic errors can happen. I entered an RFE to track this:

   http://tinyurl.com/6luw7s

Regarding forcing a revalidation, I am not sure this will help. What  
did you have in mind?

-Erik

On Jun 26, 2008, at 8:21 AM, Hank Ratzesberger wrote:
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I'll go with the castable check for now. Like I said, I'm pretty knew to XForms, so I'm not really sure what I had in mind. I've written a couple of form frameworks in Javascript in the past, and in those I checked data types and constraints before attempting calculations. In the Orbeon docs, I found something about an xxforms:computed-binds="revalidate" MIP which sounded pretty much like what I was looking for, but didn't do the trick.

Thanks for the effort and the great work, and I'll hope to be able to provide more substantial input when I get the hang of things.

Darth

On Thu, Jun 26, 2008 at 07:50:00PM -0700, Erik Bruchez wrote:


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Sorry to bump that message, but I'm encountering the same problem.

Even if I follow what Hank proposes, the error message appears

Here is what I try to do

<xforms:bind nodeset="instance('FORM.FP7CP.1.A3_1')/pers_cost"
                        calculate="
                                if((instance('FORM.FP7CP.1.A3_1')/pers_cost__rtd castable as xs:integer)
                                and (instance('FORM.FP7CP.1.A3_1')/pers_cost__demo castable as xs:integer)
                                and (instance('FORM.FP7CP.1.A3_1')/pers_cost__mng castable as xs:integer)
                                and (instance('FORM.FP7CP.1.A3_1')/pers_cost__oth castable as xs:integer))
                                then
                                        (instance('FORM.FP7CP.1.A3_1')/pers_cost__rtd+
                                        instance('FORM.FP7CP.1.A3_1')/pers_cost__demo+
                                        instance('FORM.FP7CP.1.A3_1')/pers_cost__mng+
                                        instance('FORM.FP7CP.1.A3_1')/pers_cost__oth)
                                        else()"
                                        />

If the field is empty or is not a numeric value, I catch the error message, which is a bit annoying.

Tried as well by adding an additional check on field length with same behaviour.

<xforms:bind nodeset="instance('FORM.FP7CP.1.A3_1')/pers_cost"
                        calculate="
                                if((instance('FORM.FP7CP.1.A3_1')/pers_cost__rtd castable as xs:integer and string-length(instance('FORM.FP7CP.1.A3_1')/pers_cost__rtd) > 0)
                                and (instance('FORM.FP7CP.1.A3_1')/pers_cost__demo castable as xs:integer)
                                and (instance('FORM.FP7CP.1.A3_1')/pers_cost__mng castable as xs:integer)
                                and (instance('FORM.FP7CP.1.A3_1')/pers_cost__oth castable as xs:integer))
                                then
                                        (instance('FORM.FP7CP.1.A3_1')/pers_cost__rtd+
                                        instance('FORM.FP7CP.1.A3_1')/pers_cost__demo+
                                        instance('FORM.FP7CP.1.A3_1')/pers_cost__mng+
                                        instance('FORM.FP7CP.1.A3_1')/pers_cost__oth)
                                        else()"
                                        />

Do you have any advice to prevent from displaying the error message ??

Thanks a lot for your help

Regards,
Stessy

Stessy,

The tests you are doing in that calculate expression  look good to me,
and I don't see why you would get an error there. Are you sure that
you are not getting this error for another calculate="..."? If not,
could you create a simple test case we can run the XForms sandbox to
reproduce this?

Alex

On Wed, Mar 24, 2010 at 7:53 AM, stessy <[hidden email]> wrote:

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Hi Alessandro,

Here is the file you can test.
The calculation check is done on the first line.

A3.1.xhtml

Regards,
Stessy

Stessy,

I can load the page fine (http://screencast.com/t/MTU4OTNlYm). What
should I do to reproduce the error you're seeing?

Alex

On Thu, Mar 25, 2010 at 12:40 AM, stessy <[hidden email]> wrote:

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Alessandro,

the problem occurs when I empty one of the fields on the first line.

Would it be possible not to display the error message and not perform the calculation when a field is emptied after the form is loaded??

That's what my check tries to do without success.


Thanks,
Stessy

Stessy,

I see. The problem is not with that expression computing
instance('FORM.FP7CP.1.A3_1')/pers_cost that has all the castable as
xs:integer. If you comment the other binds that follow, your example
will work fine, so I think you'll need to put some tests on those
expressions as well.

Alex

On Fri, Mar 26, 2010 at 12:17 AM, stessy <[hidden email]> wrote:

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Alex,

thanks for your help.

That was a noob question. I saw my problem. I had completely forgotten that some calculation were done vertically.

Regards,
Stessy