I have a standalone component which I want to use in a non-standalone component without making this component standalone as well. Is this possible? I tried various way but always get errors.
I have this component
import { ChangeDetectionStrategy, Component } from '@angular/core';
@Component({
selector: 'app-three-d-viewer',
standalone: true,
templateUrl: './three-d-viewer.component.html',
styleUrls: ['./three-d-viewer.component.css'],
changeDetection: ChangeDetectionStrategy.OnPush,
})
export class ThreeDViewerComponent {
}
I want to use is it my app.component
which is a non-standalone component.
import { Component } from '@angular/core';
@Component({
selector: 'app-root',
templateUrl: './app.component.html',
styleUrls: ['./app.component.css'],
})
export class AppComponent {
}
I want to use it here
<div class="layout">
<app-three-d-viewer></app-three-d-viewer>
</div>
and this is my app.module
import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { HttpClientModule } from '@angular/common/http';
@NgModule({
declarations: [
AppComponent,
],
imports: [
BrowserModule,
HttpClientModule,
],
providers: [],
bootstrap: [AppComponent]
})
export class AppModule { }
I get this error
Error: src/app/app.component.html:2:3 - error NG8001: 'app-three-d-viewer' is not a known element:
1. If 'app-three-d-viewer' is an Angular component, then verify that it is part of this module.
2. If 'app-three-d-viewer' is a Web Component then add 'CUSTOM_ELEMENTS_SCHEMA' to the '@NgModule.schemas' of this component to suppress this message.
2 <app-three-d-viewer></app-three-d-viewer>
~~~~~~~~~~~~~~~~~~~~
src/app/app.component.ts:6:16
6 templateUrl: './app.component.html',
~~~~~~~~~~~~~~~~~~~~~~
Error occurs in the template of component AppComponent.
What I tried is:
import the standalone component in ThreeDViewerComponent
the non-standalone component AppComponent
with imports: [ThreeDViewerComponent]
but get the error Error: src/app/app.component.ts:8:12 - error NG2010: 'imports' is only valid on a component that is standalone.
Using a shared.module
import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';
import { ThreeDViewerComponent } from './path/to/three-d-viewer.component';
@NgModule({
declarations: [ThreeDViewerComponent],
imports: [CommonModule],
exports: [ThreeDViewerComponent]
})
export class SharedModule {}
and import it in AppModule
but I get this error:
Error: src/app/app.module.ts:14:5 - error NG6002: This import contains errors, which may affect components that depend on this NgModule.
14 SharedModule
~~~~~~~~~~~~
Error: src/app/shared.module.ts:6:18 - error NG6008: Component ThreeDViewerComponent is standalone, and cannot be declared in an NgModule. Did you mean to import it instead?
6 declarations: [ThreeDViewerComponent],
~~~~~~~~~~~~~~~~~~~~~
Error: src/app/shared.module.ts:8:13 - error NG6004: Can't be exported from this NgModule, as it must be imported first
8 exports: [ThreeDViewerComponent]
~~~~~~~~~~~~~~~~~~~~~
× Failed to compile.
What can I do?
The standalone component cannot be declared (Declarations Array) when it's standalone, so it needs to be imported (Imports Array) on a module, either the top level one, which can be used by all the component on the declarations array.
import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { HttpClientModule } from '@angular/common/http';
import { ThreeDViewerComponent } from './path/to/three-d-viewer.component';
@NgModule({
declarations: [
AppComponent,
],
imports: [
BrowserModule,
HttpClientModule,
ThreeDViewerComponent, // <- changed here!
],
providers: [],
bootstrap: [AppComponent]
})
export class AppModule { }
Or you can import it to the shared module, only thing is that, you must export it also, for it to be visible in all the component that import the SharedModule
.
import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';
import { ThreeDViewerComponent } from './path/to/three-d-viewer.component';
@NgModule({
declarations: [],
imports: [CommonModule, ThreeDViewerComponent], // <- changed here!
exports: [ThreeDViewerComponent]
})
export class SharedModule {}
You got the error for imports
array because, on the component that is standalone only does imports
array exists, in a non standalone component, there is no imports array in the component decorator object.