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Conditionnal dropdown lists

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9 years 8 months ago #146942 by La_civette
Conditionnal dropdown lists was created by La_civette
Hi folks,

Using LS for a while but always pushing it further according my needs. I really love the toolset.

I came to a double issue recently. I search the forum without finding any sure clue.

1. Is it possible to have a drop down list modified on the fly according a previous YES/No question in same group ?
If yes, options are 0,1,2,3,4,5,6,7,8,9
If no, options are 0,1

2. Is it possible to have 2 dropdown lists conditioned by each other list in same group
If Q1 is 1 then Q2 has to be 0
If Q2 is 1 then Q1 has to be 0

I believe solution is at javascript level but am not sure.

Thank you beforehand,
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9 years 8 months ago - 9 years 8 months ago #146949 by tpartner
Replied by tpartner on topic Conditionnal dropdown lists
1) The simplest solution is to have 2 versions of the drop-down question. Show the appropriate question via relevance based on the Yes/No question.


2) There is no question validation equation for drop-downs so you'll have to write your own validation in JavaScript. Something like this in the source of one of the questions:

Code:
<script type="text/javascript" charset="utf-8"> $(document).ready(function() { var q1Dropdown = $('select[id$="X{Q1.qid}"]'); var q2Dropdown = $('select[id$="X{Q2.qid}"]'); $('#movenextbtn, #movesubmitbtn').click(function(e) { var alertText; var moveAllowed = true; if(q1Dropdown.val() == 1 && q2Dropdown.val() != 0) { alertText = 'If Q1 is 1 then Q2 has to be 0'; moveAllowed = false; } if(q2Dropdown.val() == 1 && q1Dropdown.val() != 0) { alertText = 'If Q2 is 1 then Q1 has to be 0'; moveAllowed = false; } if(moveAllowed == false) { e.preventDefault(); alert(alertText); return false; } }); }); </script>
Cheers,
Tony Partner
Solutions, code and workarounds presented in these forums are given without any warranty, implied or otherwise.
Last edit: 9 years 8 months ago by tpartner.
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9 years 8 months ago #146988 by La_civette
Replied by La_civette on topic Conditionnal dropdown lists
Indeed, forking the conditional flow is an easy way to get to the goal. Nevertheless it becomes problematic for a further question in group depending on EM calculation. If "hidden" question are not on the page it cannot calculate. Anyway I "workarounded" this as first scenario is a calculation and second one is always equal 0. I thus consider that empty string equals 0.

For the javascript I'll test this when I have a little time. In my case it would be a nice to have and not a must.

Thank you
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9 years 8 months ago - 9 years 8 months ago #147089 by La_civette
Replied by La_civette on topic Conditionnal dropdown lists
For info this successfully works for me :
Code:
<script type="text/javascript" charset="utf-8"> $(document).ready(function() { var q1Dropdown = $('#answer247846X2X29'); var q2Dropdown = $('#answer247846X2X30'); $("#answer247846X2X29").change(function() { if(q1Dropdown.val() == '1' && q2Dropdown.val() != '0') { $("#answer247846X2X30").val('0'); } }); $("#answer247846X2X30").change(function() { if(q2Dropdown.val() == '1' && q1Dropdown.val() != '0') { $("#answer247846X2X29").val('0'); } }); }); </script>

Thank you,
Last edit: 9 years 8 months ago by La_civette.
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