Re: Handling missing node values with NodeModel

I recommend reading this:

  http://freemarker.org/docs/xgui_imperative_learn.html

It answers this question among others. Anyway, you could do it like
this:

  ${.vars["com.acme.Travel"].checkIn[0]!}

The relevant change I did here is the adding of [0]; the others are
just aesthetical. You see, the result of the XPath query exists even
if it's an empty node list, so what you want to know if it has a 1st
element.


Tuesday, June 21, 2011, 3:26:15 PM, Tom Fennelly wrote:

> Hi.
>
> I'm using a NodeModel and was wondering how missing nodes can be
> handled?  I'm looking for the equivalent of the
> unsafe_expr!default_expr notation
> (http://freemarker.sourceforge.net/docs/dgui_template_exp.html#dgui_template_exp_missing),
> but something that works for NodeModels (the default did not work for me).
>
> BTW.. the template's in question use the .vars syntax in the
> expressions.  So, when I do the following I get an exception -
> ${.vars["com.acme.Travel"]["checkIn"]!""}.  The exception is...
>     Expecting a string, date or number here, Expression
> .vars["com.acme.Travel"]["checkIn"]!"" is instead a freemarker.ext.dom.NodeListModel
>     The problematic instruction:
>     ----------
>     ==> ${.vars["com.acme.Travel"]["checkIn"]!""} [on line 3,
> column 19 in free-marker-template]
>     ----------
>
>     Java backtrace for programmers:
>     ----------
>     freemarker.core.NonStringException: Error on line 3, column 21 in free-marker-template
>
> Thanks in advance.
>
> T.
-- 
Best regards,
 Daniel Dekany


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