Ensuring a component stays active while navigating in Angular 2

Currently, I have a javascript application that heavily relies on jquery. It's not the most visually appealing, difficult to maintain, and definitely in need of a framework upgrade. That's why I'm in the process of migrating it to be compatible with Angular 2.

In my new Angular 2 setup, I have created two routes:

Route A: Features a component with a WebGL canvas Route B: Displays different data using another component

The challenge arises when the initialization of the webgl component takes longer than expected based on the user's device.

After navigating from Route A to Route B, and then back to Route A, Angular 2 keeps recreating and re-initializing the WebGL component... Ideally, I would like to reuse the existing component to prevent this unnecessary duplication.

Back in the jquery days, I could simply hide and show the canvas as needed.

My query is quite similar to this one:

Angular 2 keep route alive even when not navigated to it

However, the proposed solution of using CanReuse doesn't seem to work for me. This issue was highlighted here:

routerCanReuse and routerOnReuse is not called when route changes

As these methods are specifically meant for handling transitions between components of the same type.

Answer №1

One way to ensure a component stays active during routing is by customizing the RouteReuseStrategy.
I found this informative post on the topic: Angular 2 Component Reuse Strategy

Answer №2

Unfortunately, the current capabilities of Angular 2 do not allow for this functionality to be achieved out of the box. However, it is possible to create a custom RouterOutlet that can save and restore Components during routing.


For those using the Beta release of Angular 2:

A recent discussion on the angular github presented a potential solution which can be found in this workaround.

To implement this workaround, you need to replace the standard

<router-outlet></router-outlet>
with
<persistent-router-outlet></persistent-router-outlet>
in your root component. Additionally, ensure you import PersistentRouterOutlet and add it to the directives list.

This code snippet from the workaround serves as a backup reference:

(insert modified code here)

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