gistfile1.js

var ModalView = Backbone.View.extend({
  el: '#modal',

  events: {
    'click a.close': 'onClose',
    'click a.submit': 'onSubmit',
    'shown': 'onShown'
  },

  onClose: function() {
    this.hide();
    this.$el.removeData('modal');
  },

  onSubmit: function() {
    this.$el.find('form').submit();
  },

  ajaxify: function() {
    var this_ = this;
    this.$el.find('form').ajaxify({
      complete: function(form, xhr, status) {

        var status = xhr.status / 100;

        switch(status) {
          case 2:
          $('#modal').modal('hide');
          window.location = '';
          break;

          case 4:
          $('#modal .modal-body').html(xhr.responseText);
          this_.onShown();
          break;
        }
      }
    });
  },

  onShown: function() {
    this.ajaxify();
  },

  show: function(title, remote) {
    this.$el.find('#modal-title').text(title);
    this.$el.modal({'remote': remote});
  },

  hide: function() {
    this.$el.modal('hide');
  }
});