angular - 通过单击按钮重置垫选择值

Question

我有一个 mat-select 下拉菜单，用于在 UI 上过滤数据。我使用 getTeam 函数将数据从子组件发送到父组件

垫选择

<mat-form-field>
  <mat-label>Select Team</mat-label>
  <mat-select (selectionChange)="getTeam($event)">
    <mat-option *ngFor="let team of teams" [value]="team.name">
      {{team.name}}
    </mat-option>
  </mat-select>
</mat-form-field>
<span class="material-icons" (click)="reset()">delete_sweep</span>

过滤逻辑 (.ts)getTeamQuery 接收发出的值并过滤 UI 数据。

  videos: Video[] = videos;
  filteredVideos: Video[] = videos;

    getTeamQuery(queryEmitted: string) {
    this.videos = this.filteredVideos.filter(video => {
      return video.team === queryEmitted;
    });
  }


  **Clearing the filter selection**

  reset() {
    this.videos = videos;
  }

如何通过单击 Material 图标重置垫选择的选择并返回到初始状态？初始状态，表示mat-select值是占位符的状态。

Answer 1

只需在循环之前添加一个普通的 mat-option，如下所示:

<mat-select (selectionChange)="getTeam($event)">
    <mat-option value="">Select a name...</mat-option>

    <mat-option *ngFor="let team of teams" [value]="team.name">
      {{team.name}}
    </mat-option>

  </mat-select>

编辑:根据您的评论，您可以在这种情况下使用 ngModel，如下所示:

html文件:

<mat-select (selectionChange)="getTeam($event)" [(ngModel)]="teamInitial">
  // your code...
</mat-select>

ts 文件:

export class YourComponent {
   teamInitial = '';

   // you code...

   reset() {
     this.teamInitial = '';
   }
}