md-datepicker没有使用焦点

Question

<md-input-container *ngIf="type==='date'">
  <input mdInput [mdDatepicker]="picker" (focusout)="hideEdit() [value]="value" placeholder="Choose a date">
  <button mdSuffix [mdDatepickerToggle]="picker"></button>
  <md-datepicker #picker ></md-datepicker>
</md-input-container>

我正在尝试标记到datepicker单元格，并在日历关闭后尝试关注。