Re: Handling null values

Friday, August 15, 2008, 3:42:05 PM, Daniel Dekany wrote:

> Friday, August 15, 2008, 2:23:17 PM, koevet wrote:
>
>> Hello, I have just started using Freemarker.
>>
>> I have a basic problem. How do I set the template to handle null values of
>> an int field of a pojo as String and display no values? 
>> Currently my template looks like:
>>
>> Event: "${event.eventSource!""}","${event.eventType!""}
>>
>> eventType is a int field of a pojo. If the field is null, Freemarker
>> displays 0 (default for int). I would like to change the behavior to display
>> an empty String. And no, I can't change the type to Integer.
>
> The ${event.eventSource!""} expression clearly tells FreeMarker that
> the default value is an empty string, not 0. Also, FreeMarker nowhere
> uses 0 as default for numbers. So, I guess, the interpretation of the
> missing value as 0 happens on some other level.

Oh, sorry, I have just realized what did you talk about... There is no
built-in stuff for that, but you could add a #function or
TemplateMethodModelEx for this, like:

  <#function hide0 x>
    <#if x == 0>
      <#return "">
    <#else>
      <#return x>
    </#if>
  </#function>

Sot then you can write:

  ${hide0(event.eventSource)}

-- 
Best regards,
 Daniel Dekany


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