import {Component,Provider,forwardRef} from "@angular/core";
import {ControlValueAccessor,NG_VALUE_ACCESSOR} from "@angular/forms";

const noop = () => {};

const CUSTOM_INPUT_CONTROL_VALUE_ACCESSOR: any = {
  provide: NG_VALUE_ACCESSOR,useExisting: forwardRef(() => CustomInputComponent),multi: true
};

@Component({
  selector: 'custom-input',template: `

          <input class="form-control" 
                 [(ngModel)]="value" name="somename"
                 (blur)="onTouched()">

  `,providers: [CUSTOM_INPUT_CONTROL_VALUE_ACCESSOR]
})
export class CustomInputComponent implements ControlValueAccessor{

  //The internal data model
  private _value: any = '';

  //Placeholders for the callbacks
  private _onTouchedCallback: () => void = noop;

  private _onChangeCallback: (_:any) => void = noop;

  //get accessor
  get value(): any { return this._value; };

  //set accessor including call the onchange callback
  set value(v: any) {
    if (v !== this._value) {
      this._value = v;
      this._onChangeCallback(v);
    }
  }

  //Set touched on blur
  onTouched(){
    this._onTouchedCallback();
  }

  //From ControlValueAccessor interface
  writeValue(value: any) {
    this._value = value;
  }

  //From ControlValueAccessor interface
  registerOnChange(fn: any) {
    this._onChangeCallback = fn;
  }

  //From ControlValueAccessor interface
  registerOnTouched(fn: any) {
    this._onTouchedCallback = fn;
  }

}

我有这样的应用程序模块，

/**
 * Created by amare on 8/15/16.
 */
import { NgModule }                     from '@angular/core';
import { BrowserModule }                from '@angular/platform-browser';
import { ReactiveFormsModule,FormsModule }          from '@angular/forms';
import { AppComponent }                 from './app/app.component';
import {CustomInputComponent} from "./app/shared/custom.input.component";
import {RouterModule} from "@angular/router";
@NgModule({
  imports: [ BrowserModule,ReactiveFormsModule,FormsModule,RouterModule ],declarations: [ AppComponent,CustomInputComponent],bootstrap: [ AppComponent ]
})
export class AppModule {  
}

和主要

import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { AppModule }              from './app.module';

platformBrowserDynamic().bootstrapModule(AppModule);

并且我已经使用我的一个组件的自定义输入，如下所示，但是我获得了“没有指定名称属性的表单控件的值访问器”。

<custom-input name="firstName" [(ngModel)]="firstName"></custom-input>

而app.component看起来像这样

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

@Component({
  moduleId: module.id,selector: 'app-root',templateUrl: 'app.component.html',styleUrls: ['app.component.css']
})
export class AppComponent {
  title = 'app works!';

  firstName: string;
}