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TOPIC: Just show one question from randomized group, hide the others

Re: Just show one question from randomized group, hide the others 2 years 3 months ago #78698

  • TMSWhite
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Your question was that the initial solution didn't seem to be saving the data properly to the database. My best guess is that rand() is being called more than once (e.g. when data is finalized, or when wanting to print the answers), so the set of relevant questions changes and you end up with missing data.

The solution is to ensure that the randomization is only called once. The logic for Group0 looks like this:

randq3.jpg


Note that the if() function first checks whether ask1 has already been set, and if so, uses that value. If the value hasn't been set, then it uses a random value to set the value of ask1.

Here is the replacement survey (although I removed the final summary report - you can confirm you have the proper data by activating the survey and checking that the print answers screen shows the proper values).

File Attachment:

File Name: limesurvey_survey_55164_2012-04-15.lss
File Size: 101 KB
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The following user(s) said Thank You: mr2jswe

Re: Just show one question from randomized group, hide the others 2 years 3 months ago #78701

  • mr2jswe
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Thank you, I have run your survey, reproduced it to my needs, and it works flawlessly all the way into the back-end database tables. Ive checked and double-checked.

It is now a coherent solution.

Again, thanks for your time and effort. I hope this will be of use to others as well. Cheers.

Johnny
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Re: Just show one question from randomized group, hide the others 2 years 3 months ago #78720

  • Mazi
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Thanks for your solution and its documentation, Tom.

Johnny, please open a ticket at the bugtracker for the issues you noticed using my solution. It is weird that the result is not stored, this sounds like a bug.

Best regards/Beste Grüße,
Dr. Marcel Minke
(Limesurvey Head of Support)
Need Help? We offer professional Limesurvey support
Contact: marcel.minke(at)limesurvey.org'"
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Re: Just show one question from randomized group, hide the others 2 years 3 months ago #78722

  • mr2jswe
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I have reported it to the Bugtracker just now. /J
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Re: Just show one question from randomized group, hide the others 2 years 3 months ago #78747

  • Mazi
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mr2jswe wrote:
I have reported it to the Bugtracker just now. /J
Link?

Best regards/Beste Grüße,
Dr. Marcel Minke
(Limesurvey Head of Support)
Need Help? We offer professional Limesurvey support
Contact: marcel.minke(at)limesurvey.org'"
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Re: Just show one question from randomized group, hide the others 2 years 3 months ago #78759

  • mr2jswe
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Ah, ok here it is: Bugtracker.
Last Edit: 2 years 3 months ago by mr2jswe.
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Re: Just show one question from randomized group, hide the others 2 years 3 months ago #78778

  • Mazi
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Thanks, we'll look into it and might ask some further questions at the bug ticket.

Best regards/Beste Grüße,
Dr. Marcel Minke
(Limesurvey Head of Support)
Need Help? We offer professional Limesurvey support
Contact: marcel.minke(at)limesurvey.org'"
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Re: Just show one question from randomized group, hide the others 2 years 3 months ago #78805

  • TMSWhite
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This isn't a bug in LS, but perhaps highlights a need to clarify how best to use custom JavaScript with Expression Manager.

Your custom JavaScript should have been:
<script type="text/javascript">
<!--
$(document).ready(function() 
{
// Find a random number between 1 and 4
var randNumber = Math.floor(Math.random()*3 + 1);
$('input#answer12739X218X3728').val(randNumber);
checkconditions(randNumber,'12739X218X3728','text');
})
//-->
</script>

Checkconditions() must be called in order for EM to process the new value you set for the variable (e.g. to ensure that the new value is stored within the hidden variables that are submitted, and call the relevance equations to change which questions are visible).

So, the documentation for this workaround needs to be updated for 1.92+. It isn't adequate to just call:
$('#questionQQ').hide();
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Re: Just show one question from randomized group, hide the others 2 years 3 months ago #78824

  • Mazi
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TMSWhite wrote:
It isn't adequate to just call:
$('#questionQQ').hide();
Tom, that might lead to lots of problems because to my knowledge, lots of users are using
$('#questionQQ').hide();
...at their customized Javascript. Will all these calls not work properly?

Best regards/Beste Grüße,
Dr. Marcel Minke
(Limesurvey Head of Support)
Need Help? We offer professional Limesurvey support
Contact: marcel.minke(at)limesurvey.org'"
Last Edit: 2 years 3 months ago by Mazi.
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Re: Just show one question from randomized group, hide the others 2 years 3 months ago #78826

  • TMSWhite
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Mazi-

Yes, that might be a problem for users, depending upon what they are trying to do.

EM processes conditions/relevance based upon new 'relevanceG'+$gid, 'relevance'+$qid, and 'relevance'+$SGQA values, rather than trying to infer whether a question is relevant from whether or not it is hidden.

There are plenty of cases where users want to hide values without making them irrelevant (e.g. if they are passing parameters in via the command line), so question visibility and relevance are distinct attributes.

If the user doesn't care whether data is collected from a hidden question, then calling $('#questionQQ').hide() is fine. However, hiding a variable via $('#questionQQ').hide() will not cause any cascading conditional logic to execute.

Of course, users could customize their template.js to add a jQuery.live() function to call checkconditions() whenever they issue a $('#questionQQ').hide() event, but that may be overkill, since EM-itself calls $('#questionQQ').hide() when a question is irrelevant, so I'm not sure what would happen if you tried to add a jQuery.live() event.

Perhaps Tony or Denis could propose simple ways to support users in this situation.
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