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Template Questions /

string length after trim in conditional


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14 Posts   3515 Views

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MarcelKlomp

Community Member, 5 Posts

29 December 2010 at 11:36pm

When using <% if SomeField %> conditional fields with only spaces in them are displayed as well. Is there a way to do something like if(trim(strlen($var))>0) in template conditionals?

I'm aware I could do this with a custom function in my php file but then I'd have to check all fields individually which seems rather elaborate.

My apologies in advance by the way if this is something documented or already previously answered.

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Willr

Forum Moderator, 5513 Posts

1 January 2011 at 6:20pm

Is there a way to do something like if(trim(strlen($var))>0) in template conditionals?

No, you will need a method in your controller to do this logic. You could have a function called StringExists($string) and then you have a reusable <% if StringExists(FieldName) %>

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MarcelKlomp

Community Member, 5 Posts

3 January 2011 at 1:37am

Thanks Willr, sweet and simple! Why didn't I think of that?

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spankmaster79

Community Member, 46 Posts

16 January 2011 at 6:44am

hi,

could you please tell me why this doesn't work for me? The field in the database is Varchar field. And my function looks like this:

/**
    * check if a string exists
    * @param unknown_type $varname
    */
   public function StringExists($string) {
      if(trim(strlen($string))>0) {
         return true;
      }
      return false;
   }

I don't even see the function getting called. In Page.ss I have:

<% if StringExists(URL) %>
<a href="$URL" class="ext" >$Titel</a>
<% end_if %>

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Pigeon

Community Member, 243 Posts

16 January 2011 at 1:25pm

You can't pass variables in the template, only literal strings. If you want to check it on a property of the current object, then your controller method should be like this:

public function StringExists() {
if(trim(strlen($this->URL))>0) {
return true;
}
return false;
}

As a side note, i'm slightly baffled as to why anyone would trim() and strlen() as strlen() will return an integer :S

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swaiba

Forum Moderator, 1808 Posts

16 January 2011 at 9:56pm

@Pigeon - to make sure if someone put a single space that the string is counted as blank?

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martimiz

Forum Moderator, 1132 Posts

17 January 2011 at 12:33am

:-)

if(strlen(trim($this->URL))>0) {...

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MarcelKlomp

Community Member, 5 Posts

17 January 2011 at 12:50am

@Pigeon yes, you're right of course. @swaiba answers the why, and @martimiz answers the how. My bad for putting it the wrong way around initially. Trust me however that in the actual code I have it in the right order.

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