利用Angular7开发一个Radio组件的全过程

// 安装ng cli
npm install -g @angular/cli
// 新建工程
ng new ng-project
// 进入ng-project 创建一个lib
ng generate library radio

<div class="input-wrap" [class.hor]="horizontal">
  <div class="custom-radio" *ngFor="let item of data; let i=index">
    <input #input class="custom-input" [name]="name" id="{{'radio_'+name+i}}" type="radio"
    [value]="item.value" (click)="clickHandler(item.value)" [checked]="item.value === value" 
    [disabled]="disabled">
    <label class="custom-label" for="{{'radio_'+name+i}}">{{item.name}}</label>
  </div>
</div>

export class RadioGroupComponent implements ControlValueAccessor {

  /* radio 数组 */
  @Input()
  data: Radio[] = [];

  /* radio 类型  原生或者按钮类型*/
  @Input()
  type: string;

  /* name标识 */
  @Input()
  name: string = this.idSer.generate().replace(/-/g, '_');

  /* 水平排列 */
  @Input()
  horizontal: boolean;

  /* 禁用 */
  @Input()
  disabled: boolean;

  /* radio 值 */
  @Input() value: any;

  constructor(private idSer: IdService) {

  }

  clickHandler(val: any) {
    this.value = val;
    // 更改control的值
    this.controlChange(this.value);
    this.controlTouch(this.value);
  }


  writeValue(value: any): void {
    this.value = value;
  }

  registerOnChange(fn: Function): void {
    this.controlChange = fn
  }

  registerOnTouched(fn: Function): void {
    this.controlTouch = fn
  }

  private controlChange: Function = () => { }
  private controlTouch: Function = () => { }

}

@Component({
  selector: 'radiogroup',
  templateUrl: './radiogroup.component.html',
  providers: [{
    provide: NG_VALUE_ACCESSOR,
    useExisting: forwardRef(() => RadioGroupComponent),
    multi: true,
  }]
})