Re: [jira] Commented: (TAPESTRY-1276) IF component should include an optional 'negate' parameter

[Randy Leonard <oc...@mac.com>]

 > such as extending the property expression syntax to support an  
inversion operator
Agreed... I suspect this would have uses beyond the IF component.


On Feb 22, 2007, at 12:14 PM, Howard M. Lewis Ship (JIRA) wrote:

>
>     [ https://issues.apache.org/jira/browse/TAPESTRY-1276? 
> page=com.atlassian.jira.plugin.system.issuetabpanels:comment- 
> tabpanel#action_12475122 ]
>
> Howard M. Lewis Ship commented on TAPESTRY-1276:
> ------------------------------------------------
>
> It's more verbose for some things, but I quite often find I need  
> two ifs:  for the normal case, and one for the else case.  This  
> merges both cases together with a minimum of fuss.
>
> I'm not saying the negate parameter is bad (T4 has an equivalent  
> "invert" parameter), but there may be other options that are  
> better, such as extending the property expression syntax to support  
> an inversion operator, i.e.
>
> <t:comp type="if" test="! order.lineItems">
>  . . .
> </t:comp>
>
> Another option would be to create an Unless component:
>
> <t:comp type="unless" test="order.lineItems">
>  .  . .
> </t:comp>
>
> I find both of these preferable to a negate or invert parameter.
>
>> IF component should include an optional 'negate' parameter
>> ----------------------------------------------------------
>>
>>                 Key: TAPESTRY-1276
>>                 URL: https://issues.apache.org/jira/browse/ 
>> TAPESTRY-1276
>>             Project: Tapestry
>>          Issue Type: New Feature
>>          Components: Core
>>    Affects Versions: 5.0
>>         Environment: MacOS X 10.4.8, Eclipse 3.2.1
>>            Reporter: Randy Leonard
>>            Priority: Minor
>>             Fix For: 5.0
>>
>>
>> It would be useful for the 'If' component to take an optional  
>> 'negate' parameter, much like the WOCondition component in  
>> WebObjects.  This would allow the component content to be rendered  
>> if the associated condition is FALSE instead of TRUE, therefore  
>> eliminating the need to write an additional Java method to perform  
>> this negate operation.
>
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