在 mat-radio-group 上添加名称后，角材料 mat-radio-button 默认检查不起作用

Question

在具有角度材料 5.2.5 的 Angular 5 应用程序中，使用此代码时，默认选中的单选按钮正在工作，但控制台中出现错误

代码 ：

<mat-radio-group [(ngModel)]="collection">
  <mat-radio-button class="collectionRadioButton" 
   *ngFor="let coll of collections" 
   [value]="coll.endPoint" 
   [checked]="coll.isDefault" 
   (change)="clearResults()">
  {{coll.label}}
  </mat-radio-button>
</mat-radio-group>

Chrome 控制台中的错误：

ERROR Error: If ngModel is used within a form tag, either the name attribute must be set or the form control must be defined as 'standalone' in ngModelOptions.

Example 1: <input [(ngModel)]="person.firstName" name="first">   
Example 2: <input [(ngModel)]="person.firstName" [ngModelOptions]="{standalone: true}">
at Function.TemplateDrivenErrors.missingNameException (forms.js:5891)
at NgModel._checkName (forms.js:6244)
at NgModel._checkForErrors (forms.js:6217)
at NgModel.ngOnChanges (forms.js:6099)
at checkAndUpdateDirectiveInline (core.js:12407)
at checkAndUpdateNodeInline (core.js:13935)
at checkAndUpdateNode (core.js:13878)
at debugCheckAndUpdateNode (core.js:14771)
at debugCheckDirectivesFn (core.js:14712)

但是当向 mat-radio-group 添加名称时

<mat-radio-group [(ngModel)]="collection" [name]="'aList'">

然后单选按钮列表仍然正确生成，但默认检查不再有效......

Answer 1

您将需要 [(ngModel)] 附近的 name="your_name"，然后检查的属性将不起作用，但您可以这样做。

<form>  
 <mat-radio-group [(ngModel)]="radioOptions" name="radioButtons">
    <mat-radio-button [value]="'TEST1'">TEST1</mat-radio-button>
    <mat-radio-button [value]="'TEST2'">TEST2</mat-radio-button>
</mat-radio-group> </form>

  import { FormsModule } from '@angular/forms';
  export class ConfigurazioneComponent implements OnInit {
     radioOptions: string = 'TEST1'; 
  }