Just show one question from randomized group, hide the others

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5 years 7 months ago #78698 by TMSWhite
TMSWhite replied the topic: Just show one question from randomized group, hide the others
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:



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...4-15.lss
File Size:101 KB
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The following user(s) said Thank You: mr2jswe

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5 years 7 months ago #78701 by mr2jswe
mr2jswe replied the topic: Just show one question from randomized group, hide the others
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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5 years 7 months ago #78720 by Mazi
Mazi replied the topic: Just show one question from randomized group, hide the others
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)survey-consulting.com'"

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5 years 7 months ago #78722 by mr2jswe
mr2jswe replied the topic: Just show one question from randomized group, hide the others
I have reported it to the Bugtracker just now. /J

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5 years 7 months ago #78747 by Mazi
Mazi replied the topic: Just show one question from randomized group, hide the others

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)survey-consulting.com'"

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5 years 7 months ago - 5 years 7 months ago #78759 by mr2jswe
mr2jswe replied the topic: Just show one question from randomized group, hide the others
Ah, ok here it is: Bugtracker .
Last Edit: 5 years 7 months ago by mr2jswe.

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5 years 7 months ago #78778 by Mazi
Mazi replied the topic: Just show one question from randomized group, hide the others
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)survey-consulting.com'"

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5 years 7 months ago #78805 by TMSWhite
TMSWhite replied the topic: Just show one question from randomized group, hide the others
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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5 years 7 months ago - 5 years 7 months ago #78824 by Mazi
Mazi replied the topic: Just show one question from randomized group, hide the others

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)survey-consulting.com'"
Last Edit: 5 years 7 months ago by Mazi.

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5 years 7 months ago #78826 by TMSWhite
TMSWhite replied the topic: Just show one question from randomized group, hide the others
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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5 years 7 months ago #78922 by tpartner
tpartner replied the topic: Just show one question from randomized group, hide the others
The firing of checkconditions() was always required for dynamic conditions on a page.

Tom, are you saying that if checkconditions() is not called, the value of an input field that was modified by JavaScript will not be detected when the form submits (the "Next" button is clicked) for use in conditions on subsequent pages?

Cheers,
Tony Partner
Solutions, code and workarounds presented in these forums are given without any warranty, implied or otherwise.

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5 years 7 months ago #78924 by TMSWhite
TMSWhite replied the topic: Just show one question from randomized group, hide the others
As long as the proper javascript variable has its value set, the value will be submitted when the user clicks "next". In the example below, the user set the $('#answerSGQA") variable, which is the widget that lets the user see the value, but it is the $('#javaSGQA') variable that is typically the one submitted. checkconditions() not only triggers the conditional logic, but also tends to populate the $('#javaSGQA') variable if passed the value from the $('#answerSGQA') value.

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5 years 7 months ago #78928 by tpartner
tpartner replied the topic: Just show one question from randomized group, hide the others
Hmm, I don't see any $('#javaSGQA') element for text inputs.

Regardless, in my opinion, if a visible form element (text input, radio, checkbox, ...) is modified by JavaScript it should be detected on submit as it was in the past.

There may be many people running surveys with custom scripts expecting this behaviour.

Cheers,
Tony Partner
Solutions, code and workarounds presented in these forums are given without any warranty, implied or otherwise.

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5 years 7 months ago #78949 by TMSWhite
TMSWhite replied the topic: Just show one question from randomized group, hide the others
Tony-

I just checked all of the question types. The name="SGQA" attribute is always associated with the visual input element (which is usually an id="answerSGQA" code). So, the example in this thread (which changes $('#answerSGQA')) WILL submit the value.

However, EM uses the hidden $('#javaSGQA') variable to process conditions. So, if people change an $('#answerSGQA') value but don't call checkconditions(), the downstream conditions processing won't happen.

So, people's JavaScript should continue to work as expected.

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3 years 9 months ago - 3 years 9 months ago #105323 by javimontano
javimontano replied the topic: Just show one question from randomized group, hide the others
Awesome solutions!

Now I'm wondering: Let's say, I want to recycle my questions?

Let's say I want to use a pool of questions 2 times, in two different groups of questions (Q1, and Q2), I have the same ask# questions in each group.

I want to get different ones each time, I think I would have to check that the random generation of numbers, so I don't use the same number in my ask1, and ask2 questions in my poll. Up to them, I was find, but I've tried many times with the if function, but I can't get the work done :(

Can any one help me? :)

Thanks in advance
Last Edit: 3 years 9 months ago by javimontano. Reason: Did not explain my issue well :(

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