Dear team,

we have a pool of 5000 images in resources folder. 
https://account.limesurvey.org/index.php?option=com_fss&view=image&fileid=42948&key=mWSff4U
and we would like to randomly show 2 unique pictures out of the 5000 pool of images to the respondent in one question :

https://account.limesurvey.org/index.php?option=com_fss&view=image&fileid=42949&key=mWSff4Y

Can you please help us by showing how can we do it ?
 

images below:

So, what to do?
You create two different random numbers from 1-5000. (rand1 and rand2).
There is an example here in the forum.

Hopefully you named your pictures like
"image1.jpg", "image2.jpg", ...) 

Then you can display your pictures by
<img src="upload/.../image{rand1}.jpg" ...>
<img src="upload/.../image{rand2}.jpg" ...>


If your pictures are named differently, you may use a hidden question of type "long text" as pool for the names (QPool).
Insert the names, each name with the same length (filled with blanks), let's say 20 characters.
Again create two random numbers.
Then you can extract the name of the first picture by a text function like
{trim(substr(QPool,(rand1-1)*20,20))}
and the second
{trim(substr(QPool,(rand2-1)*20,20))}


Joffm

> account.limesurvey.org/index.php?option=...id=42948&key=mWSff4U

account.limesurvey.org/customer-support

?

DEar Joffm,

Thank you so much for the idea. It is exactly what is needed!