Difference between the value "0" and an "empty space" in a TEB

You already got a link to one of my popular blogs. The problem is that Captivate doesn't allow to define the nature of the variable (string, number) but the empty variable works for both. To Captivate a text, an empty string "" and 0 are the same if you use an Expression with operators. 

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Big thanks for your answers !...

After a night of thinking (strange that I dream of Captivate ???...), I finally find an option to resolve this issue :

=> I put a "?" as a default text in my TEB, and instead of asking my learners to fullfil the blank TEB, I ask them to replace the "?" with their answer...

(But I had to "allow all" in the options of the TEB and not only "numbers"...)

I tried also this :

I create a "v_null" variable which is empty... And in my advanced action I use two conditions :

=> TEB is equal to "0"

=> TEB is different than "v_null"

(So I can let the TEB options as "numbers"...)

But this still doesn't work... as Captivate considers that "0" is equal to "v_null" an returns an incorrect answer ???...

Edit1 : In fact, I just read that the problem is not a Captivate one but a JavaScript one... JavaScript considers 0 as null...

Edit2 : Lieve has written a new blog about null : http://blog.lilybiri.com/where-is-null-in-cp2017

😉

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Hello Le Dirlo,

read the article by Lieve, where is null.

https://blog.lilybiri.com/where-is-null

Keep in mind the following definitions:

Underfined - a variable is declared but not initialised

Null - a primitive value that represents null, empty, or non-existent reference

Zero - is a number

Luis

Hi Le_Dirlo___

You could check with javascript the String property length of the string entered into the TEB. I haven't used TEBs in Captivate so far, hence I'm not sure, how the entered string is captured as a quiz/System variable in CP. Let's just call it TEBstring. If you execute javascript i.e. on a Submit button, then it could go like this:

if (TEBstring.length > 0) {
//check if TEBstring is correct
} else {
//TEBstring is in any case wrong
}

This way if nothing has been entered, the TEBstring.length should be 0 and would be filtered out.

More...

Klaus