Guide to organizing a program for adding items to a list using Backbone.Marionette

One thing that continues to confuse me about Marionette is how to structure it efficiently.

Let's consider a simple interface for displaying a list of comments and adding a new comment. I am currently structuring this using a CommentApp as shown below.

I have a couple of questions:

Is this the correct way to structure such an application? I tried following the BBCloneMail Example App where possible, but it doesn't illustrate creating new items in a collection.

Why does the layout.listRegion return undefined when calling .show() on it? Is there a definitive approach to handling triggering and binding to 'layout:rendered' events with nested layouts?

App.module "CommentApp", (CommentApp, App, B, M, $, _) ->
          // code snippet here
      

The 'comment_layout' template simply serves as a basic container template:

<h2>Comments</h2>
        <section id="comment_list_region"></section>
        <section id="new_comment_region"></section>
    

I use JST to render it by overriding the rendering function like so:

# Override the marionette renderer to make it use JST.
        Backbone.Marionette.Renderer.render = (template, data) ->
           // code snippet here
    

Answer №1

Organization

The structure of your app closely aligns with how I would typically set it up, but there are a few areas where I believe adjustments could be beneficial.

One suggestion is to avoid using an initializer for establishing the event binding for "layout:rendered". A more streamlined approach could look like this:

App.vent.bind "layout:rendered", -> CommentApp.showComments(comments)

In this scenario, embedding the event binding within the initializer may not offer substantial benefits.

Design

Why does the layout.listRegion return undefined when attempting to execute .show() on it?

I am uncertain about this issue. However, one aspect that seems peculiar is this section of code:

App.layout.mainRegion.show(layout)

Could this possibly have been meant as App.mainRegion.show(layout)?

Regions within a layout get instantiated upon invoking the layout's render function. Displaying a layout within a region triggers the layout's render method, and observing the show event of the layout to exhibit content in its regions typically functions smoothly. Personally, I follow this practice regularly.

Lately, I've encountered multiple reports of issues resembling this, suggesting the existence of a potential bug that has yet to be pinpointed.

What exactly does the template comment_template correspond to? Is it a precompiled template located elsewhere? Have you customized how templates are rendered? If so, could you provide the code responsible for this process?

If you were to execute console.dir(layout) within the layout's "show" event handler, what output do you receive? Are the region objects visible? And what additional information is present on that object?

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