Skip to content

Answer:59 using injectionToken and runInInjectionContext #1269

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Closed
ronnain wants to merge 1 commit into from
Closed

Answer:59 using injectionToken and runInInjectionContext #1269

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
34 changes: 28 additions & 6 deletions apps/angular/59-content-projection-defer/src/app/page-2.ts
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,13 @@ import { httpResource } from '@angular/common/http';
import {
ChangeDetectionStrategy,
Component,
computed,
EnvironmentInjector,
inject,
InjectionToken,
ResourceStatus,
runInInjectionContext,
viewChild,
} from '@angular/core';
import { ExpandableCard } from './expandable-card';

Expand All @@ -13,19 +19,25 @@ interface Post {
userId: number;
}

const PostResources = new InjectionToken('Fetch Post resources', {
providedIn: 'root',
factory: () =>
httpResource<Post[]>('https://jsonplaceholder.typicode.com/posts'),
});

@Component({
selector: 'app-page-2',
template: `
page2
<app-expandable-card>
<div title>Load Post</div>
<div>
@if (postRessource.isLoading()) {
@if (postResource()?.isLoading()) {
Loading...
} @else if (postRessource.status() === ResourceStatus.Error) {
} @else if (postResource()?.status() === ResourceStatus.Error) {
Error...
} @else {
@for (post of postRessource.value(); track post.id) {
@for (post of postResource()?.value(); track post.id) {
<div>{{ post.title }}</div>
}
}
Expand All @@ -36,8 +48,18 @@ interface Post {
imports: [ExpandableCard],
})
export class Page2 {
public postRessource = httpResource<Post[]>(
'https://jsonplaceholder.typicode.com/posts',
);
private readonly environmentInjector = inject(EnvironmentInjector);

private expandableCard = viewChild(ExpandableCard);

protected postResource = computed(() => {
if (this.expandableCard()?.isExpanded()) {
return runInInjectionContext(this.environmentInjector, () => {
Copy link
Copy Markdown
Owner

@tomalaforge tomalaforge Apr 3, 2025

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

you should not use runInInjectionContext, this should always be avoided.

return inject(PostResources);
});
}
return undefined;
});

protected readonly ResourceStatus = ResourceStatus;
}