velocity-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Nathan Bubna <nbu...@gmail.com>
Subject Re: Best way to handle optional attributes in 1.6.2
Date Mon, 15 Jun 2009 22:38:10 GMT
Your original VTL amounted to #if ( null != "" ) when there was no
attribute value.   The fact that this evaluated as false was a bug,
since null doesn't equal the empty string.  Several little, obscure
comparison bugs like this were fixed prior to 1.6.2.  I don't recall,
though, under which commit/JIRA Issue this fix was registered in the
changelog.

On Mon, Jun 15, 2009 at 3:19 PM, sebb<sebbaz@gmail.com> wrote:
> Thanks for the suggestions which work fine.
>
> There seems to have been a change in behaviour since version 1.5.1,
> but I could not find it in the release notes. Can anyone confirm this?
>
> On 14/06/2009, Nathan Bubna <nbubna@gmail.com> wrote:
>> That should be:
>>
>>  #if( "$!items.getAttributeValue('required')" != "" )
>>
>>  Or just $!items.getAttributeValue('required') if you don't mind
>>  showing empty strings.
>>
>>  Or if you really want to clean up the look:
>>
>>  public class AltTool {
>>   public Object empty(Object val, Object alt) {
>>     return (val == null || val.toString().length() == 0) ? alt : val;
>>   }
>>  }
>>  context.put("alt", new AltTool());
>>
>>  $alt.empty($item.getAttributeValue('required'), 'No')
>>
>>
>>  On Sat, Jun 13, 2009 at 5:39 AM, Jude
>>  Robinson<dotcode+velocity@gmail.com> wrote:
>>  >> Is there a better way to handle optional attributes?
>>  >
>>  > "!$items.getAttributeValue('required')" != ""
>>  >
>>  > ---------------------------------------------------------------------
>>  > To unsubscribe, e-mail: user-unsubscribe@velocity.apache.org
>>  > For additional commands, e-mail: user-help@velocity.apache.org
>>  >
>>  >
>>
>>  ---------------------------------------------------------------------
>>  To unsubscribe, e-mail: user-unsubscribe@velocity.apache.org
>>  For additional commands, e-mail: user-help@velocity.apache.org
>>
>>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: user-unsubscribe@velocity.apache.org
> For additional commands, e-mail: user-help@velocity.apache.org
>
>

---------------------------------------------------------------------
To unsubscribe, e-mail: user-unsubscribe@velocity.apache.org
For additional commands, e-mail: user-help@velocity.apache.org


Mime
View raw message