custom.js

myCustomConfirmBox = function(message, callback) {
  var options;
  options = [
    {
      'label': 'Yes, Definitely',
      'class': 'btn-danger',
      'callback': function() {
        if (typeof callback === 'function') {
          return callback();
        }
      }
    }, {
      'label': 'Opss! No',
      'class': 'btn-success'
    }
  ];
  return bootbox.dialog(message, options);
};

$.rails.allowAction = function(element) {
  var answer, callback, message;
  message = element.data("confirm");
  if (!message) {
    return true;
  }
  answer = false;
  callback = void 0;
  if ($.rails.fire(element, "confirm")) {
    myCustomConfirmBox(message, function() {
      var oldAllowAction;
      callback = $.rails.fire(element, "confirm:complete", [answer]);
      if (callback) {
        oldAllowAction = $.rails.allowAction;
        $.rails.allowAction = function() {
          return true;
        };
        element.trigger("click");
        return $.rails.allowAction = oldAllowAction;
      }
    });
  }
  return false;
};

custom.js.coffee

  window.myCustomConfirmBox = (message, callback) ->
    options = [
      {
      'label': 'Yes, Definitely'
      'class': 'btn-danger'
      'callback': ->
        if typeof callback == 'function'
          callback()
      }
      {
      'label': 'Opss! No'
      'class': 'btn-success'
      }

    ]

    bootbox.dialog message, options

  $.rails.allowAction = (element) ->
    message = element.data("confirm")
    return true  unless message

    answer = false
    callback = undefined

    if $.rails.fire(element, "confirm")
      myCustomConfirmBox message, ->
        callback = $.rails.fire(element, "confirm:complete", [answer])
        if callback
          oldAllowAction = $.rails.allowAction
          $.rails.allowAction = ->
            true

          element.trigger "click"
          $.rails.allowAction = oldAllowAction

    false