Leverage prefetch triggers as hooks to load custom data

[Kumirei]

Which @angular/* package(s) are relevant/related to the feature request?

core

Description

Some components need to fetch data before they can be rendered. Currently we are initializing these calls in the OnInit hook; it would be nice if instead deferrable views with prefetch triggers could be leveraged to dynamically load necessary data ahead of rendering.

Proposed solution

I propose an OnPrefetch hook that components and directives can implement which is called when the component or directive has been pre-fetched in a deferred view. This hook would be called before OnInit.

Alternatives considered

Alternatively a callback could be supplied to the prefetch trigger, which can be used to pre-load the data into a global store.

[pkozlowski-opensource]

Thnx for the suggestion but we are going to pass on this one. The main reason is that we don't think linking data fetching to the defer views. A given component can be used both inside a deferred view and outside of it - it would be very surprising if a component works in one scenario but not in another.

We do some projects planned to look into data fetching more holistically, though.

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