RE: How best to do a once only calculation?

Adam,

What you're after is much like a 'default' value, which XForms doesn't
support, but can be emulated like this:

  <xforms:bind
   nodeset="Date_begun"
   id="Date_begun"
   type="xsd:dateTime"
   calculate="if(string(text()) = '', now(), text())"
  />

To use this 'default' technique more generally, so that your form users can
also edit the value, make sure that the readonly MIP is disabled:

  <xforms:bind
   nodeset="how-many-pizzas"
   calculate="if(string(text()) = '', 1, text())"
   readonly="false()"
  />

Regards,

Mark


Mark Birbeck
CEO
x-port.net Ltd.

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> -----Original Message-----
> From: www-forms-request@w3.org 
> [mailto:www-forms-request@w3.org] On Behalf Of Flinton Adam
> Sent: 06 June 2006 16:09
> To: www-forms@w3.org
> Subject: How best to do a once only calculation?
> 
> 
> We have a need to put in a date generated when you construct 
> the form as such I have looked at
> 
> <xforms:bind nodeset="Date_begun" id="Date_begun" type="xsd:dateTime"
> calculate="now()" />
> 
> However rather obviously it will do this everytime I open 
> this element/form.
> 
> We have an element which can carry a value which we are using 
> to denote if something is new (i.e. should have the date 
> now() generated) or already existing i.e. it should be left as is.
> 
> 
> Any ideas?
> 
> TIA
> 
> 
> Adam
> 
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Received on Tuesday, 6 June 2006 15:56:29 UTC