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Hi, I need to prepare forms for conference where people will provide personal contat info and HAVE to submit information 
which workshop will choose. It means that during some time period between 9 a.m. and 11 a.m. thay have to go to 1 of 5 rooms
workshop 1 (room 1)
workshop 2 (room 2)
workshop 3 (room 3)
workshop 4 (room 4)
workshop 5 (room 5)
so it can be shown as single choice questions list (dropdown or radio). But i have to limit number of person in each room up to 25 person.
So it means that after 50 persons will sign up and for expample in room 2 will be already 25 persons who choose that workshop that form have to limit this option and for 51 person will see only as active choice
workshop 1 (room 1)
workshop 2 (room 2)
workshop 3 (room 3)
workshop 4 (room 4) - full (no more join)
workshop 5 (room 5)

i have no idea  how to setup that condition?
Any idea ? 


Your LimeSurvey version: LimeSurvey Cloud   Version 5.6.4

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This "condition" does not exist. At least not out of the box.

You can use quota to limit the number of respondents per answer, but this will still allow to choose the room that is already full, but respondents will be then "screened out".

In LS 5 there is the option to check previous responses, so you can check how many respondents have already chosen a specific room and then could use relevance equations to hide this question. However, single choice questions don't have relevance equations, so you would have do some workaround via a hidden multiple choice question and then use an array filter.

Limesurvey is a survey tool and not made for reservations, at least not out of the box.

As @holch,
since version 5.x. there is a plugin "statFunctions" implemented. 
Read the manual about it
[url] www.limesurvey.org/manual/StatFunctions [/url]

Now the easiest implementation of your idea is to use a multiple question with Max. answers set to "1"
With these subquestions
 
(you see the equation to show the available places, up to you to adapt it to your needs)
and these subquestion relevance equations
 

you get this
 
You see, workshop 2 was already chosen 3 times and is not displayed anymore.
Otherwise you may show it, but as not selectable, by changing the "array filter type".

This - using a multiple question - avoids the workaround with an equation that presets a hidden multiple question which is used as array filter of the single question.
Anyway, this procedure is explained many times here in the forum.
This afternoon I will send an example - if the file upload works.

Joffm




 

As promised, the sample survey.

Both options - multiple question and single question.
And two options to display. Up to you do refine this
 

Joffm