angular 2错误:Can't resolve for FormGroup的所有参数

angular 2 error: Can't resolve all parameters for FormGroup

本文关键字：FormGroup for resolve 参数 错误 Can angular      更新时间：2023-09-26

我遵循thoughttram的教程FormBuilder http://blog.thoughtram.io/angular/2016/06/22/model-driven-forms-in-angular-2.html我复制了代码并更改了一些变量名称。我使用的是Angular 2.1.2、Typescript 2.0.8和Angular Material2(来自Google)。Atom Typescript说任何页面上都没有错误。尽管如此，我还是在加载时出现错误，并且页面没有使用这段新代码加载。

zone.js:388 Unhandled Promise rejection: Can't resolve all parameters for FormGroup: (?, ?, ?). ; Zone: <root> ; Task: Promise.then ; Value: Error: Can't resolve all parameters for FormGroup: (?, ?, ?).(…) Error: Can't resolve all parameters for FormGroup: (?, ?, ?).
at CompileMetadataResolver.getDependenciesMetadata (http://localhost:3000/node_modules/@angular/compiler/bundles/compiler.umd.js:14598:21)
at CompileMetadataResolver.getTypeMetadata (http://localhost:3000/node_modules/@angular/compiler/bundles/compiler.umd.js:14499:28)
at eval (http://localhost:3000/node_modules/@angular/compiler/bundles/compiler.umd.js:14642:43)
at Array.forEach (native)
at CompileMetadataResolver.getProvidersMetadata (http://localhost:3000/node_modules/@angular/compiler/bundles/compiler.umd.js:14622:21)
at CompileMetadataResolver.getDirectiveMetadata (http://localhost:3000/node_modules/@angular/compiler/bundles/compiler.umd.js:14262:36)
at eval (http://localhost:3000/node_modules/@angular/compiler/bundles/compiler.umd.js:14367:51)
at Array.forEach (native)
at CompileMetadataResolver.getNgModuleMetadata (http://localhost:3000/node_modules/@angular/compiler/bundles/compiler.umd.js:14361:51)
at RuntimeCompiler._compileComponents (http://localhost:3000/node_modules/@angular/compiler/bundles/compiler.umd.js:17063:49)consoleError @ zone.js:388_loop_1 @ zone.js:417drainMicroTaskQueue @ zone.js:421ZoneTask.invoke @ zone.js:339
2016-11-10 16:01:40.394 zone.js:390 Error: Uncaught (in promise): Error: Can't resolve all parameters for FormGroup: (?, ?, ?).(…)consoleError @ zone.js:390_loop_1 @ zone.js:417drainMicroTaskQueue @ zone.js:421ZoneTask.invoke @ zone.js:339

HTML示例 for apartment4Rent.component.html

<form [formGroup]="registerApartment4RentForm" (submit)="onSubmit($event)">
  <md-input id="country" name="country" class="required" aria-labelledby="country" formControlName="country"
i18n-placeholder="select country placeholder" placeholder="Country" type="text"  size="30" maxlength="30">
  </md-input>

加上4，州，城市，街道和邮政编码相同

AppComponent with constructor from the tutorial - in the app folder

import { Component, OnInit } from '@angular/core';
import { FormBuilder, FormGroup } from '@angular/forms';
import { ReactiveFormsModule } from '@angular/forms';
@Component({
    moduleId: module.id,
    selector: 'residence-app',
    templateUrl: "components/navigation/headerFooter.html",
    styleUrls: [ "components/navigation/styleHeaderFooter.css" ],
    providers: [
      FormBuilder,
      FormGroup
    ]
})
export class AppComponent implements OnInit {
    registerApartment4RentForm: FormGroup;
    constructor(private formBuilder: FormBuilder) {}
    ngOnInit() {
      this.registerApartment4RentForm = this.formBuilder.group({
        country: '',
        stateProvince: '',
        address: this.formBuilder.group({
          streetAddress: '',
          zipCode: '',
          city: ''
        })
      });
    }
}

templateUrl中的headerFooter.html有一些用于页眉和页脚的html和

            <div>
                <router-outlet></router-outlet>
            </div>

在我尝试这个响应式表单代码之前，在其中加载和显示公寓4rent .component.html。目录结构是app/components/input/apartment4Rent.component(s)

响应式表单需要做哪些改变?

你把Angular响应式表单模块作为导入添加到你的模块了吗?看起来它缺少由该模块注册的服务。

(我在打电话，很抱歉简短的回答)

编辑

我的意思是:

import { NgModule } from '@angular/core';
import { BrowserModule } from '@anglar/platform-browser';
import { ReactiveFormsModule } from '@angular/forms';
@NgModule({
  imports: [BrowserModule, ReactiveFormsModule],
  declarations: [AppComponent],
  bootstrap: [AppComponent]
})
export class AppModule {}

注意ReactiveFormsModule

的导入

出现此错误的另一个原因是您导入了两次formgroup。我在我的应用程序模块中删除了它，现在它为我工作，希望它能帮助别人。

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