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Upgrade Guide

Marionette 3 introduces a number of breaking changes. This upgrade guide will go through the major changes and describe how to change your application to accommodate them.

Where possible, we will document how to make the changes in Marionette 2.4.5 so that your applications can continue to work and to ease the burden of upgrading to Marionette 3.

Views

The most noticeable change to Marionette 3 is the consolidation of ItemView and LayoutView into View. In addition, CompositeView has been removed and its functionality merged into CollectionView and View.

Removing LayoutView and ItemView

Using separate View LayoutView and ItemView was complicating the API for Marionette needlessly. The new View replaces all of this and sets a clear recommendation for building layout trees.

Upgrading for Marionette 2.4.5

For updating in Marionette 2.4.5, it is recommended you change all instances of ItemView to LayoutView.

Upgrading to Marionette 3

Change all instances of LayoutView and ItemView to View. Any views that previously extended View with a custom render should work relatively unchanged.

Removing CompositeView

The CompositeView was deprecated in favor of using View and CollectionView. The CompositeView will be completely removed in Marionette 4.

See CollectionView for detail on upgrading to Marionette 3. This technique works in both Marionette 2.4.5 and Marionette 3.

Child event handlers

The childEvents attribute was renamed to childViewEvents.

Child event bubbling above one level is now removed in most instances and deprecated pending removal everywhere else. This can no longer be relied upon. To pass events further up the chain, you must explicitly using childViewTriggers to convert the event from the child into an event on the parent. These can be chained all the way up to the level you require them to be.

Bubbled child events no longer pass the childView implicitly and only pass the arguments passed as part of triggerMethod. This means that the arguments passed to onEvent and onChildviewEvent are now identical.

In Marionette 2, childEvents where bound on every event. In Marionette 3, childViewEvents are bound once and cached. This means that you cannot add new events after the view has been created.

View triggers

The view triggers attribute no longer passes an options attribute to event handlers, instead passing the view instance that triggered the event.

Events

A number of lifecycle events were changed or removed from Marionette 3. Information on which ones were removed, changed, or added will be found here with recommendations on how to update your code.

show and before:show

The show events were removed completely as they were redundant and were being used incorrectly to show child regions. The show event was fired after the view had been attached, meaning the DOM was being constantly updated, leading to deteriorated performance.

Upgrading for Marionette 2.4.5

Replace all instances of onShow, on('show'), onBeforeShow and on('before:show') to use the render and before:render events. This is the recommendation for Marionette 3 and ensures the DOM tree is built in-memory before modifying the DOM.

Upgrading to Marionette 3

Replace all instances of show and before:show with render and before:render. If you want the view to be visible in the DOM, then listen to the dom:refresh event.

Templates

The biggest change to templates is renaming templateHelpers to templateContext - the aim is to be more in-line with terminology from other frameworks.

Upgrading to Marionette 3

Simply replace all instances of templateHelpers with templateContext

Regions

There are a number of changes to how regions behave - the biggest change being the removal of the ability to access regions as attributes

Removing view.region

The view.<region_name> syntax has been removed in favor of view.getRegion(), view.getChildView() and view.showChildView().

Upgrading for Marionette 2.4.5 and 3

Change all references to view.region to view.getRegion('region'). For example, in Mn 2.4 and below:

var AnotherView = require('./anotherview');

var MyView = Mn.LayoutView.extend({
  regions: {
    myregion: '.regionname'
  },

  onRender: function() {
    this.myregion.show(new AnotherView());
  }
});

This does not work in Mn 3 - instead do:

var AnotherView = require('./anotherview');

/* In Mn 2.4 we can just use LayoutView */
var MyView = Mn.View.extend({
  regions: {
    myregion: '.regionname'
  },

  onRender: function() {
    this.showChildView('myregion', new AnotherView());
  }
});

See the documentation for views to learn more about how to manage regions in Marionette 3.

Modules

Marionette Modules have been completely removed in favor of using the more standard JavaScript module loaders e.g. Webpack or Browserify. See the installation documentation for a list of potential options.

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