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从 Angular Material Design Stepper 获取步骤索引

[英]Get step index from Angular Material Design Stepper

I am trying to get the selected step in an component that is using Angular Material Design stepper.我正在尝试在使用 Angular Material Design 步进器的组件中获取选定的步骤。

The thing is that I am trying to get it by using selectedIndex property, but now is always getting "1" when I try to get it问题是我试图通过使用 selectedIndex 属性来获取它,但是现在当我尝试获取它时总是得到“1”

        <button mat-button mat-flat-button color="primary"
                (click)="onSave(stepper)">
          SAVE
        </button>
onSave(stepper: MatStepper)
  {
    debugger;
    let workflowStepName = this.declarationWorkflowHelper.getWorkflowName(stepper.selectedIndex);

    this.screenSave.next(workflowStepName);
  }

I expect the selected index of the stepper, but I am always retrieving "1"我期望步进器的选定索引,但我总是检索“1”

Try to set explicitly stepControl to your matStep .尝试将stepControl显式stepControl为您的matStep Eg firstFormGroup , secondFormGroup :例如firstFormGroupsecondFormGroup

<mat-step [stepControl]="firstFormGroup">
    <form [formGroup]="firstFormGroup">
      <!-- The code is omitted for the brevity -->
      <div>
        <button mat-button matStepperNext>Next</button>
      </div>
    </form>
  </mat-step>
  <mat-step [stepControl]="secondFormGroup">
    <form [formGroup]="secondFormGroup">
      <!-- The code is omitted for the brevity --> 
     <div>
        <button mat-button matStepperPrevious>Back</button>
        <button mat-button matStepperNext>Next</button>
      </div>
    </form>
  </mat-step>

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