Answers for "jquery data attribute on select option"

jquery get option data attribute

$(this).find(':selected').data('id');

jquery select by data attribute

$('div[data-key=value]');

select onchange jquery get the selected option data attribute

$('#country').on('change', function(){
    let id = $(this).find(':selected').data('id');
    console.log(id);
  });

jquery get data attribute of selected option

$(this).find(':selected').data('id')