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Randomising MaxDiff (ie. best/worse case) scenarios

lemonlimebitters
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10 years 4 months ago #136102 by lemonlimebitters

Randomising MaxDiff (ie. best/worse case) scenarios was created by lemonlimebitters

Hi,
Has anyone anyone done any randomisation on the MaxDiff question type ?

Limesurvey (2.0) randomisation does this to the wrong scale since the MaxDiff uses Array by column.

lemonlimebitters

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tpartner
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10 years 4 months ago - 10 years 4 months ago #136151 by tpartner

Replied by tpartner on topic Randomising MaxDiff (ie. best/worse case) scenarios

Here is a version of the maxDiff function updated for 2.0x. Changes to behaviour are:
- Random positioning of left/right columns
- Disabling opposite radio in a selected row (instead of pop-up alert)

Code:

<script type="text/javascript" charset="utf-8">		
	$(document).ready(function(){
	
		maxDiff({QID});

		function maxDiff(qID) {
			
			// Random number between 1 and 2
			// Math.floor(Math.random() * (max - min + 1)) + min;
			var randomNum = Math.floor(Math.random() * ((2-1)+1) + 1);

			// Move the cells around
			$('#question'+qID+' table.subquestions-list col:eq('+randomNum+')').prependTo('colgroup.col-responses');
			$('#question'+qID+' table.subquestions-list thead tr:eq(0) th:eq('+(randomNum-1)+')').prependTo('#question'+qID+' table.question thead tr:eq(0)');
			$('#question'+qID+' table.subquestions-list tbody tr').each(function(i){
				$('td.answer-item:eq('+(randomNum-1)+')', this).prependTo(this);
			});

			// Style stuff
			$('#question'+qID+' table.subquestions-list col.odd').css({ 'background-color':'transparent' });
			$('#question'+qID+' table.subquestions-list tbody th').css({ 'text-align':'center' });
			$('#question'+qID+' table.subquestions-list tbody tr:even td, #question'+qID+' table.question tbody tr:even th').css({ 'background-color':'#F1F1F1' });
			$('#question'+qID+' table.subquestions-list tbody tr:odd td, #question'+qID+' table.question tbody tr:odd th').css({ 'background-color':'#FCFCFC' });

			// Prevent clicking twice in the same row
			$('#question'+qID+' input.radio').on('click', function () {

				$('#question'+qID+' input.radio').prop('disabled', false);
				$('#question'+qID+' input.radio:checked').each(function(i) {
					var thisRow = $(this).closest('tr');
					$('input.radio', thisRow).not(this).prop('disabled', true);
				});
			});
		}
	});	
</script>

Sample survey attached:

File Attachment:

File Name: limesurvey...8666.lss
File Size:16.76 KB

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

Last edit: 10 years 4 months ago by tpartner.

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lemonlimebitters
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10 years 4 months ago #136292 by lemonlimebitters

Replied by lemonlimebitters on topic Randomising MaxDiff (ie. best/worse case) scenarios

Thanks tpartner, I was hoping to randomise the other scale (ie. Product price, colour options, etc, in reference to your example image)
Is that possible?
Thanks for modifying to remove the pop-up

lemonlimebitters

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tpartner
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10 years 4 months ago #136402 by tpartner

Replied by tpartner on topic Randomising MaxDiff (ie. best/worse case) scenarios

Oh, I see, the question randomization setting affect the answers, not the sub-questions as I thought. I'm traveling today but should have a workaround tomorrow.

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

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tpartner
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10 years 4 months ago #136473 by tpartner

Replied by tpartner on topic Randomising MaxDiff (ie. best/worse case) scenarios

Try this for randomized rows:

Code:

<script type="text/javascript" charset="utf-8">		
	$(document).ready(function(){
	
		// Call the maxDiff() function
		// Set the second parameter to true for randomized rows 
		maxDiff({QID}, true);
	});

	function maxDiff(qID, randomize) {
		
		// Random number between 1 and 2
		// Math.floor(Math.random() * (max - min + 1)) + min;
		var randomNum = Math.floor(Math.random() * ((2-1)+1) + 1);

		// Move the columns
		$('#question'+qID+' table.subquestions-list col:eq(1)').prependTo('colgroup.col-responses');
		$('#question'+qID+' table.subquestions-list thead tr:eq(0) th:eq(0)').prependTo('#question'+qID+' table.question thead tr:eq(0)');
		$('#question'+qID+' table.subquestions-list tbody tr').each(function(i){
			$('td.answer-item:eq(0)', this).prependTo(this);
		});
		$('#question'+qID+' table.subquestions-list tbody tr').each(function(i){
			$('td.answer-item:eq(0)', this).prependTo(this);
		});
		
		// Random rows
		if(randomize) {
			var rowsArr = [];
			$('#question'+qID+' table.subquestions-list tbody tr').each(function(i){
				$(this).attr('data-index', i);
				rowsArr.push(i);
			});
			shuffleArray(rowsArr);
			$(rowsArr).each(function(i){
				$('#question'+qID+' table.subquestions-list tbody').append($('#question'+qID+' tr[data-index="'+this+'"]'));
			});
		}

		// Style stuff
		$('#question'+qID+' table.subquestions-list col.odd').css({ 'background-color':'transparent' });
		$('#question'+qID+' table.subquestions-list tbody th').css({ 'text-align':'center' });
		$('#question'+qID+' table.subquestions-list tbody tr:even td, #question'+qID+' table.question tbody tr:even th').css({ 'background-color':'#F1F1F1' });
		$('#question'+qID+' table.subquestions-list tbody tr:odd td, #question'+qID+' table.question tbody tr:odd th').css({ 'background-color':'#FCFCFC' });

		// Prevent clicking twice in the same row
		$('#question'+qID+' input.radio').on('click', function () {

			$('#question'+qID+' input.radio').prop('disabled', false);
			$('#question'+qID+' input.radio:checked').each(function(i) {
				var thisRow = $(this).closest('tr');
				$('input.radio', thisRow).not(this).prop('disabled', true);
			});
		});
	}
	
	function shuffleArray(array) {
		for (var i = array.length - 1; i > 0; i--) {
			var j = Math.floor(Math.random() * (i + 1));
			var temp = array[i];
			array[i] = array[j];
			array[j] = temp;
		}
		return array;
	}
</script>