角材料垂直步进器单一形式。重置()功能不正常

我一直在为我的一个网页开发一个步进元素,并试图实现 .reset() 使用材料设计文档将表单恢复为空白状态的功能( https://material.angular.io/components/stepper/overview )

下面是多表单组的例子,我可以看到,通过将您放回到第一步并清除表单,reset可以正确地工作。但是,在尝试使用单窗体结构时,我发现 stepper.reset() 返回到第一步,但不清除窗体。

我试着将重置按钮标记为 Type="button" 由于单个表单要求在“下一步”和“上一步”按钮上单击以防止表单提交,但没有看到任何更改。

我希望在单击重置时两个操作都发生,但是我不确定是否需要编写手动重置功能,或者我的代码中是否只存在错误。

对此,任何帮助都将不胜感激。谢谢!

创建.component.html

<form [formGroup]="formGroup" class="content-container" (ngSubmit)="onSubmit()">
  <h1>{{title}}</h1>
  <mat-vertical-stepper #stepper>
    <mat-step formGroupName="someFieldGroup" [stepControl]="someFieldGroup">
      <ng-template matStepLabel>Fill out Field</ng-template>
      <mat-form-field>
        <input matInput placeholder="Some Field" formControlName="someFieldCtrl" name="someFieldName" required>
        <mat-error>This field is required</mat-error>
      </mat-form-field>
      <div>
        <button type="button" mat-button matStepperNext>Next</button>
      </div>
    </mat-step>
    <mat-step formGroupName="anotherFieldGroup" [stepControl]="anotherFieldGroup">
      <ng-template matStepLabel>Fill out Field</ng-template>
      <mat-form-field>
        <input matInput placeholder="Another Field" formControlName="anotherFieldCtrl" name="anotherFieldName" required>
        <mat-error>This field is required</mat-error>
      </mat-form-field>
      <div>
        <button type="button" mat-button matStepperPrevious>Back</button>
        <button type="button" mat-button matStepperNext>Next</button>
      </div> 
    </mat-step>
    <mat-step formGroupName="dropdownFieldGroup" [stepControl]="dropdownFieldGroup">
      <ng-template matStepLabel>Select Option</ng-template>
      <mat-form-field>
        <mat-select placeholder="Select Option" disableOptionCentering formControlName="dropdownFieldCtrl" name="dropdownFieldName" required>
          <mat-option value="1">One</mat-option>
          <mat-option value="2">Two</mat-option>
          <mat-option value="3">Three</mat-option>
          <mat-option value="4">Four</mat-option>
        </mat-select>
        <mat-error>This field is required</mat-error>
      </mat-form-field>
      <div>
        <button type="button" mat-button matStepperPrevious>Back</button>
        <button type="button" mat-button matStepperNext>Next</button>
      </div>
    </mat-step>
    <mat-step>
      <ng-template matStepLabel>Done</ng-template>
      You are now done.
      <div>
        <button type="button" mat-button matStepperPrevious>Back</button>
        <button type="submit" mat-button>Done</button>
        <button mat-button (click)="stepper.reset()">Reset</button>
      </div>
    </mat-step>
  </mat-vertical-stepper>
</form>

创建.component.ts

import { Component, OnInit } from '@angular/core';
import { FormGroup, FormControl } from '@angular/forms';

//Type Imports
import { Service } from '../service';
import { Post } from './post';

@Component({
  selector: 'app-create',
  templateUrl: './create.component.html',
  styleUrls: ['./create.component.css']
})
export class CreateComponent implements OnInit {

  title = 'Create';

  formGroup: FormGroup;
  post: Post = {} as Post;

  constructor(private service: Service) { }

  ngOnInit() {
    this.formGroup = new FormGroup({
      someFieldGroup: new FormGroup({
        someFieldCtrl: new FormControl(null)
      }),
      anotherFieldGroup: new FormGroup({
        anotherFieldName: new FormControl(null)
      }),
      dropdownFieldGroup: new FormGroup({
        dropdownFieldCtrl: new FormControl(null)
      })
    });
  }

  onSubmit() {
    this.post.someField = this.formGroup.get('someFieldGroup').get('someFieldName').value;
    this.post.anotherField = this.formGroup.get('anotherFieldGroup').get('anotherFieldName').value;
    this.post.dropdownField = this.formGroup.get('dropdownFieldGroup').get('dropdownFieldName').value;

    this.service.create(JSON.stringify(this.post)).subscribe(data => { console.log(data) });
  }
}