相关疑难解决方法(0)

我收到此错误 - "模板解析错误:NgControl没有提供者"

 The error comes from this line of code

 --> <select (ngModel)="currencies" (ngModelChange)="showPurchase($event)" class="annka-center" name="curencies">
       <option *ngFor="let money of currencies; let i = index" (ngValue)="money" (click)="showPurchase(money)"> {{money.Currency}} </option>
 </select>

上面的代码工作顺利,直到我将ReactiveFormsModule添加到我的应用程序.

我在这里尝试了解决方案

错误:没有NgControl Angular AOT的提供者

但这对我没有用.我正在使用Angular 4.

我正在尝试在我的应用中第一次使用ngControl:

<md-input placeholder="Amount" value="0" ngControl="ammount" required></md-input>

在我的组件中添加了以下内容:

import { FORM_PROVIDERS,FORM_DIRECTIVES } from '@angular/common';

..

directives: [MD_INPUT_DIRECTIVES,
    FORM_DIRECTIVES,
    ],
    providers: [FORM_PROVIDERS],

我收到此错误:

browser_adapter.ts:78 EXCEPTION: Error: Uncaught (in promise): Template parse errors:
No provider for ControlContainer ("

[ERROR ->]<md-input placeholder="Amount" value="0" ngControl="ammount" required></md-input>

我错过了什么？

ng test 显示以下错误，但它在现实中按预期工作。

Error: Template parse errors:
    No provider for NgControl ("
      <div class="form-group">
        <label class="control-label">Location</label>
        [ERROR ->]<select class="selectpicker" *ngIf="locations" data-style="btn btn-primary btn-round" title="Select A"): VehicleFormComponent@27:4
    No provider for NgControl ("  <div class="form-group label-floating">
        <label class="control-label">Is Available</label>
        [ERROR ->]<md-slide-toggle [(ngModel)]="isAvailable" color="primary" [ngModelOptions]="{standalone: true}">
       "): VehicleFormComponent@41:4 in src/test.ts (line 25739)
    Expected undefined to be truthy.

我认为这主要是因为添加[ngModelOptions]="{standalone: true}"了自定义标签。