Disable AJAX in the question theme options and add a script like this to the source of the question:
Code:
<script type="text/javascript" charset="utf-8">
$(document).on('ready pjax:scriptcomplete',function(){
// Identify this question
var thisQuestion = $('#question{QID}');
$('input:text', thisQuestion).on('slideEnabled',function(){
var thisItem = $(this).closest('li');
var thisSlider = $('.slider', thisItem);
var answerInput = $('input:text.form-control', thisItem).not('[id$="slid"]');
// Hide the tooltip if no value for the slider
if($(answerInput).val() == '') {
$('.tooltip', thisSlider).hide();
}
// Listener on slider
$(this).on('slide slideStop', function(event) {
$('.tooltip', thisSlider).show();
});
});
});
</script>