In my opinion you logic will is flawed because you can still enter a lower language level now than when you started.
Having said that, placing this script in the source of the first question will meet your requirements.
Code:
<script type="text/javascript" charset="utf-8">
$(document).on('ready pjax:scriptcomplete',function(){
// Identify the questions
var q1ID = {QID};
var q1 = $('#question'+q1ID);
var q2ID = $(q1).nextAll('.array-flexible-row:eq(0)').attr('id').replace(/question/, '');
var q2 = $('#question'+q2ID);
var q3ID = $(q1).nextAll('.array-flexible-row:eq(1)').attr('id').replace(/question/, '');
var q3 = $('#question'+q3ID);
var arrays = $(q1).add(q2).add(q3);
// Assign column-specific classes
$('table.subquestion-list tr', arrays).each(function(i) {
$('> *:gt(0)', this).each(function(i){
$(this).addClass('column-'+(i+1));
});
});
// Default answers in Q1
$('table.subquestion-list tr.answers-list', q1).each(function(i) {
if($('input[type="radio"]:checked', this).length == 0) {
$('input[type="radio"]:first', this).trigger('click');
}
});
// Listener on the Q1 radios
$('input[type="radio"]', q1).on('click', function(i) {
handleRadios(this);
});
$('input[type="radio"]', q2).on('click', function(i) {
handleRadios(this);
});
function handleRadios(el) {
var thisQID = $(el).closest('.array-flexible-row').attr('id').replace(/question/, '');
var nextQID = $(el).closest('.array-flexible-row').nextAll('.array-flexible-row:eq(0)').attr('id').replace(/question/, '');
var thisSQCode = $(el).attr('name').split('X'+thisQID)[1];
var thisQCode = $(el).val();
var nextCol1Radio = $('tr[id$="X'+nextQID+thisSQCode+'"] .column-1 input[type="radio"]');
var nextThisRadio = $('tr[id$="X'+nextQID+thisSQCode+'"] input[type="radio"][value="'+thisQCode+'"]');
if(!$(el).closest('td').hasClass('column-1')) {
// Disable column-1 in the next question
$(nextCol1Radio).prop('checked', false).prop('disabled', true);
// Trigger the corresponding radio in the next question
$(nextThisRadio).trigger('click');
}
else {
// Enable column-1 in the next question
$(nextCol1Radio).prop('disabled', false);
}
}
});
</script>
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