Get trial (Loop & Merge sample) number

[Becky]

Hi forum,

Can anyone tell me how to access the current trial number (i.e. sample number from the Loop & Merge table)? I’m trying to display a break screen that is conditional on the trial number. I looked through the QRTE source code found

currentLoops = '${lm://CurrentLoopNumber}'

so I tried using

return '${lm://CurrentLoopNumber}' === 20

within the break screen conditional function, but that didn’t work.

Thanks!
Becky

[Erwin Haasnoot]

Hi Becky,

You’re close! But there’s a slight issue.
return '${lm://CurrentLoopNumber}' === 20

Evaluates, in Qualtrics, on CurrentLoopNumber 20 to:

return '20' === 20

Now, see for yourself. Open the developer console and then type in: ’20’ === 20. You’ll notice that it evaluates to “false”.

This is because === strictly type checks, next to value. ’20’ is a string, 20 is a number, these don’t match, so it’s false.

Fixing it simple. Simply wrap the 20 in quotes, so that it becomes a string: ’20’

return '${lm://CurrentLoopNumber}' === '20'

Hopefully you’ll be able to figure it out from here!

Best regards,

Erwin

• This reply was modified 9 years ago by Erwin Haasnoot.

[Becky]

Hi Erwin,

Thanks very much for explaining this! I’ve changed the right side of the equation to a string, and it works perfectly now.

Thanks also for the link to the developer console. I wasn’t aware of this tool, and I’m sure it will be useful for debugging things like this in the future.

Best regards,
Becky

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