$(".block").removeClass("not-allowed");
    $(".list").removeClass("no-click");

$('.list').on('click', function() {
  $(this).addClass('no-click');
});

$('.block').on('click', function() {
  $(this).addClass('not-allowed');
});

$(document).on("click", '.removebtn', function(e) {
  var tgt = $(e.target);
  var idx = tgt.index();
  $('.block').eq(idx).removeClass('not-allowed').find('.list').removeClass('no-click');
  tgt.closest('.row').remove();
});

$(document).on.....

$(document).delegate('.class_off_button', 'click', function (){
    //what you want to do
});