Thanks for the quick replay, my updated 'ognless' if condition now reads
. . .
<t:if test="payoutTransfers">
<t:actionlink
t:id="exportButton">${message:EXPORT}</t:actionlink>
</t:if>
/Brian. :-)
Howard Lewis Ship wrote:
> The not operator (!) coerces the value to a boolean; nil is false, as
> is any kind of empty collection. Thus
> <t:if test="! payoutTransfers"> ... </t:if> should work.
>
> On Mon, Oct 5, 2009 at 8:39 AM, Brian Long <bl...@annadaletech.com> wrote:
>
>> Hi all,
>>
>> just a quick question, looking at the property expressions guide @
>> http://tapestry.apache.org/tapestry5/guide/propexp.html it looks like I
>> should be able to evaluate whether a property has a null value (handy
>> for if conditions) without having to use ognl,
>>
>> e.g. instead of
>>
>> <t:if test="ognl:(payoutTransfers != null)">
>> <t:actionlink
>> t:id="exportButton">${message:EXPORT}</t:actionlink>
>> </t:if>
>>
>> I should be able to use the property expression directly, there's a null
>> keyword and an notOpt !, but what is the proper synthax?
>>
>> Regards, Brian.
>>
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