gistfile1.js

Backbone.Router.extend({
    routes:{
      '*filter': 'setFilter'
    },

    setFilter: function( param ) {
      // Set the current filter to be used
      window.app.TodoFilter = param.trim() || '';

      // Trigger a collection filter event, causing hiding/unhiding
      // of Todo view items
      window.app.Todos.trigger('filter');
    }
  });

  app.TodoRouter = new Workspace();