使用ngControl导致的错误:没有ControlContainer的提供程序 [英] Using ngControl caused error: No provider for ControlContainer

问题描述

我正在尝试在我的应用程序中首次使用ngControl:

I'm trying to use ngControl for the first time in my app:

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

在我的组件中添加了以下内容:

Added the following in my component:

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

..

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

我得到这个错误:

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>

我想念什么?

推荐答案

我认为您忘记了将md-input组件包装在form标记中，否则ngControl无效:

I think that you forgot to wrap the md-input component in form tag, otherwise ngControl won't work:

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

此伪指令只能用作NgForm或NgFormModel的子代.

This directive can only be used as a child of NgForm or NgFormModel.

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