If Condition... expressions.

Permanently deleted user

17 Augusti 2017 00:01

Can someone elaborate for me what type of conditions work or what they expect... I am missing something simple.

 

For example:

$value1.result = "Hello world"

What is the simple way to test for non-null, or non-empty...

I assumed JS so i tried:

 

=$value1.result

 

False

 

and then negated that...

=!$value1.result

 

False

 

and then negated that...

=!!$value1.result

 

True

 

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  Ryan Cooney

  17 Augusti 2017 00:35

  $value1.result = "Hello world" // Evaluates to undefined // This is actually assigning a value to $value1.result. The If activity is expecting a Boolean value so it treats undefined as false.   $value1.result == "Hello world" // Evaluates to true or false // Use double equals to test for equality. This is what you will want in most cases   $value1.result // Evaluates to the string value of result // The If activity is expecting a Boolean value so it treats it as false   !$value1.result // Evaluates to false // In JavaScript !(some string value) evaluates to false   !!$value1.result // Evaluates to true // This is just negating the previous expression !(!$value1.result) is the same as !false which is true

  --Ryan

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  Permanently deleted user

  17 Augusti 2017 14:21

  So I want to test that $value1.result is not empty and null, how would you achieve that? the double-negative?

   

  the screenshot is valid for the UI, but it either isn't converted into a 'true/false condition' or maybe evaluates to false for a different reason?

  

   

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  Permanently deleted user

  17 Augusti 2017 14:29

  sorry re-read your first response and you do note it evaluates to false because its a string...

   

  I saw the link in the IF activity help to : https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Boolean

   

  I tried: =Boolean($value1.result) as per the links suggestion, but that didn't seem to do anything ... likely 'custom java' problem.

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  Ryan Cooney

  17 Augusti 2017 16:07

  To check if a string value is not empty and not null you want to use:

  !!$value1.result

   

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