JAVASCRIPT

reset a select option jquery

$('#baba').prop('selectedIndex',0);

reset select form jquery

 $('select').each( function() {
        $(this).val( $(this).find("option[selected]").val() );
    });

reset select option jquery

$('ClassOrIDName').prop('selectedIndex',0); 
// this works perfectly. just put this in any action and your 1st option should be 'select one item' type

reset select2 jquery | clear select2 option value

$("ClassOrIDName").trigger("change");