Angular5 extracts the instance code of radio list of public components

import { Component, OnInit, Input, Output, EventEmitter } from '@angular/core';
import { RadioItem } from '../../model/radio';
import { NgModel } from '@angular/forms';
@Component({
  selector: 'app-radio-list',
  templateUrl: './',
  styleUrls: ['./']
})
export class RadioListComponent implements OnInit {
  @Input() list: RadioItem[];
  @Input() name: string;
  @Input() colNum: number = 6;
  @Input("selectModel") model: string;
  @Output("selectChange") onChange: EventEmitter<any> = new EventEmitter<any>();
  constructor() { }
  ngOnInit() {
  }
  changeSelected() {
    let data = { value: , name:  };
    (data);
  }
}

<div *ngIf="list" class="form-row">
  <div class="col-{{colNum}} mb-2" *ngFor="let item of list">
    <div class="form-check abc-radio abc-radio-primary">
      <input class="form-check-input" type="radio" [value]="" [(ngModel)]="model" (change)="changeSelected()" name="{{name}}" >
      <label class="form-check-label" for="{{name}}_{{}}">
        {{}}
      </label>
    </div>
  </div>
</div>

import { RadioListComponent } from '../components/radio-list/';
export const routes = [
  { path: '', component: xxxComponent, pathMatch: 'full' }
];
@NgModule({
  imports: [...],
  declarations: [...
    , RadioListComponent
    , ...],
  providers: []
})
export class xxxModule {
  static routes = routes;
}

 <app-radio-list [list]="sourceArr"
         [name]="'selectedSource'"
         [colNum]="12"
        [(selectModel)]="selectedSource"
        (selectChange)="selectChange($event)">
 </app-radio-list>

 selectChange(model: any) {
   this[] = ;
 }