gistfile1.js

$("#some_checkbox").click(function() {
  var checkbox = $(this)
  checkbox.attr("disabled", true)

  $.ajax($("form").attr("action"), {
    type: "POST",
    data: $("form").serialize(),

    success: function() {
      alert("User updated")
    },

    error: function() {
      alert("Oops, something didn't work!")
    },

    complete: function() {
      checkbox.attr("disabled", false)
    }
  })
})