Angular2无法绑定到DIRECTIVE，因为它不是element的已知属性 [英] Angular2 Can't bind to DIRECTIVE since it isn't a known property of element

问题描述

我通过Angular CLI生成了新的@Directive，将其导入到我的app.module.ts

I generated new @Directive by Angular CLI, it was imported it to my app.module.ts

import { ContenteditableModelDirective } from './directives/contenteditable-model.directive';

import { ChatWindowComponent } from './chat-window/chat-window.component';

@NgModule({
  declarations: [
    AppComponent,
    ContenteditableModelDirective,
    ChatWindowComponent,
    ...
  ],
  imports: [
    ...
  ],
  ...
})

然后我尝试在我的组件(ChatWindowComponent)中使用

and I try to use in my component (ChatWindowComponent)

<p [appContenteditableModel] >
    Write message
</p>

即使inside指令中只有Angular CLI生成的代码:

even if within directive is only Angular CLI generated code:

 import { Directive } from '@angular/core';

 @Directive({
   selector: '[appContenteditableModel]'
 })
 export class ContenteditableModelDirective {

 constructor() { }

 }

我得到了错误:

zone.js:388未处理的承诺拒绝:模板解析错误: 无法绑定到"appContenteditableModel"，因为它不是"p"的已知属性.

zone.js:388 Unhandled Promise rejection: Template parse errors: Can't bind to 'appContenteditableModel' since it isn't a known property of 'p'.

我尝试了几乎所有可能的更改，都遵循了角度文档一切都应该起作用，但是没有.

I tried almost every possible changes, following this angular docs everything should work but it does not.

有帮助吗?

推荐答案

在将属性包装在方括号[]中时，您试图绑定到该属性.因此，您必须将其声明为@Input.

When wrapping a property in brackets [] you're trying to bind to it. So you have to declare it as an @Input.

import { Directive, Input } from '@angular/core';

@Directive({
 selector: '[appContenteditableModel]'
})
export class ContenteditableModelDirective {

  @Input()
  appContenteditableModel: string;

  constructor() { }

}

重要的是，成员(appContenteditableModel)需要被命名为DOM节点上的属性(在本例中为指令选择器).

The important part is, that the member (appContenteditableModel) needs to be named as the property on the DOM node (and, in this case, the directive selector).

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