在Angular 11中动态编译组件的推荐方法是什么? [英] What is the recommended way to dynamically compile component in Angular 11?
本文介绍了在Angular 11中动态编译组件的推荐方法是什么?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
在我们的应用中,我们使用以下指令来显示动态Angular组件:
In our app we have the following directive which is used in order to display dynamic Angular components:
import {Compiler, Component, Directive, Input, ModuleWithComponentFactories, NgModule, OnDestroy, ViewContainerRef} from '@angular/core';
import {Render} from './render';
@Directive({
selector: '[appRender]',
exportAs: 'appRender'
})
export class RenderDirective implements OnDestroy {
@Input()
public set model(model: Render) {
this.compile(model);
}
constructor(private readonly viewContainerRef: ViewContainerRef,
private readonly compiler: Compiler) {
}
private compile(model: Render) {
@Component({template: model.template})
class TemplateComponent {
}
@NgModule({
imports: model.imports,
declarations: [TemplateComponent]
})
class TemplateModule {
}
this.compiler.compileModuleAndAllComponentsAsync(TemplateModule).then((factories: ModuleWithComponentFactories<any>) => {
const factory = factories.componentFactories.find(component => component.componentType === TemplateComponent);
const componentRef = this.viewContainerRef.createComponent(factory);
Object.assign(componentRef.instance, model.instance);
componentRef.hostView.detectChanges();
});
}
ngOnDestroy(): void {
this.viewContainerRef.clear();
}
}
我们正在从8.2到11进行Angular更新.更新之后,我们面临以下错误:
We are in the middle of Angular update from 8.2 to 11. After the update we are facing the following error:
ERROR Error: Angular JIT compilation failed: '@angular/compiler' not loaded!
- JIT compilation is discouraged for production use-cases! Consider AOT mode instead.
- Did you bootstrap using '@angular/platform-browser-dynamic' or '@angular/platform-server'?
- Alternatively provide the compiler with 'import "@angular/compiler";' before bootstrapping.
at getCompilerFacade (core.js:4086)
at Function.get (core.js:26924)
at getNgModuleDef (core.js:1139)
at new NgModuleFactory$1 (core.js:25317)
at Compiler_compileModuleSync__POST_R3__ (core.js:28165)
at Compiler_compileModuleAndAllComponentsSync__POST_R3__ (core.js:28175)
at Compiler_compileModuleAndAllComponentsAsync__POST_R3__ [as compileModuleAndAllComponentsAsync] (core.js:28188)
at RenderDirective.compile (common.js:4560)
at RenderDirective.set model [as model] (common.js:4541)
at setInputsForProperty (core.js:10961)
我相信这与IVY编译器有关.问题是在Angular 11中获得相同结果的推荐方法是什么?
推荐答案
我设法通过以下方式解决了该问题:
I managed to fix that issue by:
- 在RenderModule中提供<code> JitCompilerFactory
@NgModule({
declarations: [RenderDirective],
exports: [RenderDirective],
providers: [{provide: COMPILER_OPTIONS, useValue: {useJit: true}, multi: true},
{provide: CompilerFactory, useClass: JitCompilerFactory, deps: [COMPILER_OPTIONS]},
{provide: Compiler, useFactory: createCompiler, deps: [CompilerFactory]}]
})
export class RenderModule {
}
- 用功能定义替换带注释的组件和模块:
// BEFORE
private compile(model: Render) {
@Component({template: model.template})
class TemplateComponent {
}
@NgModule({
imports: model.imports,
declarations: [TemplateComponent]
})
class TemplateModule {
}
this.compiler.compileModuleAndAllComponentsAsync(TemplateModule).then((factories: ModuleWithComponentFactories<any>) => {
const factory = factories.componentFactories.find(component => component.componentType === TemplateComponent);
const componentRef = this.viewContainerRef.createComponent(factory);
Object.assign(componentRef.instance, model.instance);
componentRef.hostView.detectChanges();
});
}
// AFTER
private compile(model: Render) {
const templateComponent = Component({template: model.template})(class {});
const templateModule = NgModule({
imports: model.imports,
declarations: [templateComponent]
})(class {});
this.compiler.compileModuleAndAllComponentsAsync(templateModule).then((factories: ModuleWithComponentFactories<any>) => {
const factory = factories.componentFactories.find(component => component.componentType === templateComponent);
const componentRef = this.viewContainerRef.createComponent(factory);
Object.assign(componentRef.instance, model.instance);
componentRef.hostView.detectChanges();
}).catch(err => console.error(err));
}
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