educoder/app/views/admins/laboratories/update.js.erb

var index = $(".laboratory-item-<%= @laboratory.id %>").children(":first").html();
$(".laboratory-item-<%= @laboratory.id %>").html("<%= j render partial: "admins/laboratories/shared/laboratory_item",locals: {laboratory: @laboratory, index: 1} %>");
$(".laboratory-item-<%= @laboratory.id %>").children(":first").html(index);