Array filter between Scale 1 and Scale 2 in Dual Matrix - by: tpartner

<script type="text/javascript" charset="utf-8">
	$(document).on('ready pjax:scriptcomplete',function(){
 
		// Identify this question
		var thisQuestion = $('#question{QID}');
 
		// Identify the "exclusive" answer(s) in scale one
		// Multiple answers separated by commas are possible
		var exclusiveValues = ['A4','A5'];
 
		// Hide the "N/A" option in scale 2
		// Set this to false if you want that option always visible
		var hideNA = true;
 
		// Identify the "N/A" value in scale 2
		var naValue = $('select[id$="_1"]:eq(0) option:last', thisQuestion).attr('value');
 
		// A function to handle the drop-down behaviour
		function handleSelects(thisSelect) {
			var selectVal = $(thisSelect).val();
			var thisRow = $(thisSelect).closest('tr');
			var exclusive = false;
			$.each(exclusiveValues, function(i, val) {
				if(selectVal == val) {
					exclusive = true;
				}
			});
			if(exclusive == true) {
				if(hideNA == true) {
					$('select[id$="_1"] option[value="'+naValue+'"]', thisRow).toggleOption(true);
				}				
				$('select[id$="_1"]', thisRow).val(naValue).prop('disabled', true);
			}
			else {
				$('select[id$="_1"]', thisRow).prop('disabled', false);
				if(hideNA == true) {
					$('select[id$="_1"] option[value="'+naValue+'"]', thisRow).toggleOption(false);
				}				
			}
		}
 
		// Listener on the drop-downs
		$('select[id$="_0"]', thisQuestion).on('change', function(e) {
			handleSelects($(this));
		});
 
		// Initial states
		$('select[id$="_0"]', thisQuestion).each(function(i) {
			handleSelects($(this));
		});
 
		// On submit
		$('#ls-button-submit').on('click', function(e) {
			$('select[id$="_1"]', thisQuestion).prop('disabled', false);
		});
	});
 
	$.fn.toggleOption = function(show) {
		jQuery(this).toggle(show);
		if(show) {
			if( jQuery(this).parent('span.toggleOption').length)
				jQuery(this).unwrap();
		} else {
			if(jQuery(this).parent('span.toggleOption' ).length == 0)
				jQuery(this).wrap( '<span class="toggleOption" style="display: none;" />');
		}
	};
</script>