Class-toggle-depend-on-attr.js

// Class toggle for all btn
$('button.btn').on('click', function(){
  var ele = ($(this).attr("data-ele-target").length) ? $(this).attr("data-ele-target") : null ;
  var class_name = ($(this).attr("data-ele-toggle").length) ? $(this).attr("data-ele-toggle") : null ;
  (ele &&  class_name) ? $(ele).toggleClass(class_name) : null;
});