A simple plugin that allows you to display a message on the next route transition, similiar to Rails' flash[:notice]. This is useful for displaying one time notices on later pages.

You should include ember-flash-message.js on your page. Since the plugin depends on Ember.js you will have to include Ember first. Now any of your route's will have access to flashMessage('message'), which will set the message.

Any template that you want to display the message should contain the following. It makes the most sense to put this in your application template to have the message be available on all pages.

{{#flashMessage}}
  <div {{bind-attr class="message.type"}}>
    {{message.text}}
  </div>
{{/flashMessage}}

Any route can call this.flashMessage(message) to set the message. The message will be displayed after the next transition. After the router transitions for a second time the message will be destroyed.

Ember.LoginRoute = Ember.Route.extend({
  actions: {
    login: function() {
      // login user ...
      this.flashMessage('Welcome back!', 'success');
      this.transitionTo('index');
    }
  }
});

There may be some instances where you want to display the message right away and not wait for the route to transition. You can use the now() function to update the message.

Ember.ProfileRoute = Ember.Route.extend({
  actions: {
    save: function(profile) {
      var router = this;

      profile.save().then(function() {
        router.flashMessage('Your profile has been updated!').now();
      });
    }
  }
});

While you could easily remove flash messages yourself, the main FlashMessageController contains a convinence action named dismissFlashMessage that will remove the current message. To use this action, you just need to add a link (or any other element) that triggers it.

{{#flashMessage}}
  <div {{bind-attr class=':flash-message message.type'}}>
    {{message.text}}
    <a href='#' class='dismiss' {{action 'dismissFlashMessage'}}>x</a>
  </div>
{{/flashMessage}}

The flash message can be set from the controller by adding a needs dependency for the flashMessage controller. See the example below.

App.PostController = Ember.ObjectController.extend({
  needs: ['flashMessage'],

  actions: {
    save: function() {
      var flashMessage = this.get('controllers.flashMessage');

      this.get('model').save()
        .then(function() {
          flashMessage.set('message', 'Blog post saved!');
        });
    }
  }
});

Please note that whenever you set the flash message from a control it will be displayed instantly.

This plugin is built with rake pipeline, which requires Ruby. To get started:

bundle install
bundle exec rackup

Edit code and visit http://localhost:9292 to run tests.