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Conditionnal dropdown lists

La_civette
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8 years 4 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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tpartner
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8 years 4 months ago - 8 years 4 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 &amp;&amp; q2Dropdown.val() != 0) {
        alertText = 'If Q1 is 1 then Q2 has to be 0';
        moveAllowed = false;
      }
      if(q2Dropdown.val() == 1 &amp;&amp; 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: 8 years 4 months ago by tpartner.

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La_civette
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8 years 4 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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La_civette
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8 years 4 months ago - 8 years 4 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' &amp;&amp; q2Dropdown.val() != '0') {
            $("#answer247846X2X30").val('0');
    }
  });
    $("#answer247846X2X30").change(function() {
        if(q2Dropdown.val() == '1' &amp;&amp; q1Dropdown.val() != '0') {
            $("#answer247846X2X29").val('0');
    }
  });
});
</script>

Thank you,

Last edit: 8 years 4 months ago by La_civette.

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