Hi,
I'm stuck with the following situation:
A list of forms is available to be filled in by users. These forms may be transformed to pdf at any time. Some information in a form depends on other information in the same form. For example: if the user has selected the value "yes I love candy" in field A then the field B "Favourite candy is Twix" is of importance too and should be printed on the pdf. When the user had selected "No, I don't like candy" field B should not be printed (however it could contain a value that should be disregarded). So on screen when filling in the form (and maybe changing it afterwards, the user can save the form to adapt it later) all fields are available, but on pdf a selection should be made.
As I'm talking about a bunch of forms, each with it's own dependencies among the fields, I was thinking about setting a depends-on attribute (something like a xsl test expression) wherever needed in the form. But how can I actually extract these tests and apply them. Eg. it would be fantastic if I an xslt stylesheet could extract the test and actually perform it (so I would have a xslt-compatible expression in my form, and this should be extracted and evaluated by xslt). It seems to me that there's no way to do this as xslt would have to do two steps ( Prove me wrong here;-):
eg: <xsl:if test="@depends-on"> checks on the attribute, but I need to evaluate the expression in that attribute. So step one: put in value of attribute, step two: evaluate that expression
(think of : <xsl:if test="[EMAIL PROTECTED]"> where {} is evaluated first)
I'm wondering if it's possible to write a transformer that can check these dependencies, and how to check that testexpression in @depends-on. It will be likely that it's a xpath expression, so can I write a domtransformer that does a xpath evaluation? More specifically: in that transformer, how/where can I access the whole document and evaluate an xpath expression? Maybe there's an example somewhere in cocoon? Would this slow everything down a lot because it's dom and not sax? Or are there better ways to do something alike?
Kind Regards, Jan
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