我的代码环境是 Angular 9，当我设置响应式表单时，我遇到了这个错误：
错误 NG8002：无法绑定到“formGroup”，因为它不是“form”的已知属性。
我在 Google 和 StackOverflow 进行了一些研究，但在使用 Angular 9 时找不到相同的问题，但是，根据其他帖子的建议，我将 ReactiveFormsModule 导入 app.module.ts、routing.module.ts 和 recipe-编辑.component.spec.ts 文件。但是，错误不断弹出。我附上我的代码，有人可以给我建议吗？
app.module.ts
import { RecipeService } from './recipes/recipe.service';
import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { FormsModule, ReactiveFormsModule} from '@angular/forms';
import { RoutingModule } from './routing.module';
import { ShoppingListService } from './shopping-list/shopping-list.service';
import { AppComponent } from './app.component';
import { RecipesComponent } from './recipes/recipes.component';
import { RecipeListComponent } from './recipes/recipe-list/recipe-list.component';
import { RecipeItemComponent } from './recipes/recipe-list/recipe-item/recipe-item.component';
import { RecipeDetailComponent } from './recipes/recipe-detail/recipe-detail.component';
import { HeaderComponent } from './header/header.component';
import { ShoppingListComponent } from './shopping-list/shopping-list.component';
import { ShoppingEditComponent } from './shopping-list/shopping-edit/shopping-edit.component';
import { DropdownDirective } from './shared/dropdown.directive';
@NgModule({
declarations: [
AppComponent,
RecipesComponent,
RecipeListComponent,
RecipeItemComponent,
RecipeDetailComponent,
HeaderComponent,
ShoppingListComponent,
ShoppingEditComponent,
DropdownDirective
],
imports: [
BrowserModule,
FormsModule,
ReactiveFormsModule,
RoutingModule
],
providers: [ShoppingListService, RecipeService],
bootstrap: [AppComponent]
})
export class AppModule { }
路由.module.ts
import { FormsModule, ReactiveFormsModule } from '@angular/forms';
import { RecipeStartComponent } from './recipes/recipe-start/recipe-start.component';
import { RecipeDetailComponent } from './recipes/recipe-detail/recipe-detail.component';
import { NgModule } from '@angular/core';
import { Routes, RouterModule } from '@angular/router';
import { ShoppingListComponent } from './shopping-list/shopping-list.component';
import { RecipesComponent } from './recipes/recipes.component';
import { RecipeEditComponent } from './recipes/recipe-edit/recipe-edit.component';
const routes: Routes = [
{path: '', redirectTo: '/recipes', pathMatch: 'full'},
{path: 'recipes', component: RecipesComponent, children: [
{path: '', component: RecipeStartComponent},
{path: 'new', component: RecipeEditComponent},
{path: ':id', component: RecipeDetailComponent},
{path: ':id/edit', component: RecipeEditComponent}
]},
{path: 'shopping-list', component: ShoppingListComponent}
];
@NgModule({
imports: [RouterModule.forRoot(routes), FormsModule, ReactiveFormsModule],
exports: [RouterModule]
})
export class RoutingModule {}
配方-edit.component.ts
import { Component, OnInit } from '@angular/core';
import { ActivatedRoute, Params } from '@angular/router';
import { FormGroup, FormControl } from '@angular/forms';
import { RecipeService } from './../recipe.service';
@Component({
selector: 'app-recipe-edit',
templateUrl: './recipe-edit.component.html',
styleUrls: ['./recipe-edit.component.css']
})
export class RecipeEditComponent implements OnInit {
id: number;
editMode = false;
recipeForm: FormGroup;
constructor(private route: ActivatedRoute, private recipeService: RecipeService) { }
ngOnInit() {
this.route.params
.subscribe(
(paras: Params) => {
this.id = +paras.id;
this.editMode = paras.id != null;
this.initForm();
}
);
}
private initForm() {
let name = '';
let imagePath = '';
let description = '';
if (this.editMode) {
const editRecipe = this.recipeService.getRecipe(this.id);
name = editRecipe.name;
imagePath = editRecipe.imagePath;
description = editRecipe.desc;
}
this.recipeForm = new FormGroup({
name: new FormControl(name),
imagePath: new FormControl(imagePath),
description: new FormControl(description)
});
}
onSubmit() {
console.log(this.recipeForm);
}
}
配方-edit.component.html
<div class="row">
<div class="col-xs-12">
<form (ngSubmit) = "onSubmit()" [formGroup] = "recipeForm" >
<div class="row">
<div class="col-xs-12">
<button class="btn btn-success" type = "submit"> Save </button>
<button class="btn btn-danger" type = "button"> Cancel </button>
</div>
</div>
<div class="row">
<div class="col-xs-12">
<div class="form-group">
<label for="name"> Recipe Name</label>
<input
type = "text"
id = "name"
formControlName="name"
class="form-control">
</div>
</div>
</div>
<div class="row">
<div class="col-xs-12">
<div class="form-group">
<label for="imagePath"> Image URL </label>
<input
type = "text"
id = "imagePath"
formControlName="imagePath"
class="form-control">
</div>
</div>
</div>
<div class="row">
<div class="col-xs-12">
<img src="" class="img-reponsive">
</div>
</div>
<div class="row">
<div class="col-xs-12">
<div class="form-group">
<label for="description"> Description </label>
<textarea
type = "text"
id = "description"
formControlName="description"
class="form-control"
rows = "6"></textarea>
</div>
</div>
</div>
<div class="row">
<div class="col-xs-12">
<div class="row">
<div class="col-xs-8">
<input
type = "text"
class = "form-control">
</div>
<div class="col-xs-2">
<input
type = "number"
class = "form-control">
</div>
<div class="col-xs-2">
<button class="btn btn-danger" type = "button"> X </button>
</div>
</div>
</div>
</div>
</form>
</div>
</div>
配方-edit.component.spec.ts
import { async, ComponentFixture, TestBed } from '@angular/core/testing';
import { RecipeEditComponent } from './recipe-edit.component';
import { ReactiveFormsModule, FormsModule } from '@angular/forms';
describe('RecipeEditComponent', () => {
let component: RecipeEditComponent;
let fixture: ComponentFixture<RecipeEditComponent>;
beforeEach(async(() => {
TestBed.configureTestingModule({
declarations: [ RecipeEditComponent ],
imports: [ReactiveFormsModule, FormsModule]
})
.compileComponents();
}));
beforeEach(() => {
fixture = TestBed.createComponent(RecipeEditComponent);
component = fixture.componentInstance;
fixture.detectChanges();
});
it('should create', () => {
expect(component).toBeTruthy();
});
});