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[英]Angular is not running change detection through ChangeDetectorRef
[英]Angular - change detection in dynamically loaded module/component without using `ChangeDetectorRef`
我用編譯器的compileModuleAsync
編譯了一個 Angular 模塊(動態加載模塊),並希望將模塊的一個組件插入到視圖中。
我試圖將組件插入到ViewContainer
中,但該組件不會自動檢測到更改。 每次更新組件的屬性時,我都應該調用changeDetectorRef.detectChanges
。
有沒有辦法在不使用changeDetectorRef
的情況下實現這一點?
Angular 版本為10.0.4
。
我加載組件的示例代碼:
我加載另一個組件的組件:
<ng-template #dynamic></ng-template>
@ViewChild('dynamic', { read: ViewContainerRef })
dynamic: ViewContainerRef;
constructor(
private compiler: Compiler,
private injector: Injector
) {}
async ngAfterViewInit() {
// Load a module dynamically
const exampleModule = await import('../example/example.module').then(m => m.ExampleModule);
const moduleFactory = await this.compiler.compileModuleAsync(exampleModule);
const moduleRef = moduleFactory.create(this.injector);
const componentFactory = moduleRef.instance.resolveComponent();
const ref = container.createComponent(componentFactory, null, moduleRef.injector);
}
示例模塊:
@NgModule({
declarations: [
ExampleComponent
],
imports: [...]
})
export class ExampleModule {
constructor(private componentFactoryResolver: ComponentFactoryResolver) { }
public resolveComponent(): ComponentFactory<ExampleComponent> {
return this.componentFactoryResolver.resolveComponentFactory(ExampleComponent);
}
}
調用detectChanges
的示例:
示例組件
<button (click)="toggle()">Show/Hide</button>
<span *ngIf="show">Show</span>
public toggle() {
this.show = !this.show;
this.cdr.detectChanges(); // <- I want to not use this.
}
我使用此服務來創建組件集輸入:
@Directive({
selector: '[formField]'
})
export class FormFieldDirective implements Field, OnChanges, OnInit, AfterViewInit {
@Input() config: FieldConfig;
@Input() lang: string;
@Input() group: FormGroup;
@Input('class') classList: string = 'col-12';
component: ComponentRef<Field>;
constructor(
private resolver: ComponentFactoryResolver,
private container: ViewContainerRef,
private renderer: Renderer2
) { }
ngOnChanges() {
if (this.component) {
this.component.instance.config = this.config;
this.component.instance.group = this.group;
}
}
ngOnInit() {
if (!components[this.config.type]) {
const supportedTypes = Object.keys(components).join(', ');
throw new Error(
`Trying to use an unsupported type (${this.config.type}).
Supported types: ${supportedTypes}`
);
}
const component = this.resolver.resolveComponentFactory<Field>(components[this.config.type]);
this.component = this.container.createComponent(component);
this.renderer.addClass(this.component.location.nativeElement, this.config.widthClass ? this.config.widthClass : 'col-12');
this.component.instance.config = this.config;
this.component.instance.group = this.group;
this.component.instance.lang = this.lang;
if (this.config.type === ModelType.group) {
this.component.instance.innerForm = this.group.get(this.config.name) as FormGroup;
}
}
ngAfterViewInit() {
this.config.label += 'cica';
}
}
用法:
<div [ngClass]="formClass" [formGroup]="form">
<ng-container *ngFor="let field of config;" formField [config]="field" [lang]="lang" [group]="form"> </ng-container>
<ng-content></ng-content>
</div>
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