flash_js_example.js

$.ajax({
  // ...
}).fail(function(response){
  window.Flash(response.message, 'error', $('.some-class-container'))
})


// ..helpers/flash_helpers.js
window.Flash = function (message, type, $container) {
  $container = ($container == null) ? $('.container-fluid.container-page') : $container

  var html =
    '<div class="alert alert-flash alert-' + type + '">' +
      '<button class="close" data-dismiss="alert" type="button">×</button>' +
      '<div id="flash_alert">' +
        '<i class="icon-thumbs-down"></i>' +
        message +
      '</div>' +
    '</div>'

  return $container.prepend(html);
}