Angular Material Vertical Stepper 单一形式 .reset() 无法正常运行

Question

我一直在为我的一个网页开发步进元素，并尝试实现 .reset() 功能，以便使用 Material 设计将表单恢复为空白状态文档 ( https://material.angular.io/components/stepper/overview )

按照多表单组示例，我可以看到 .reset 通过将您带回到第一步并清除表单来正常工作。但是，在尝试使用单一表单结构时，我发现 stepper.reset() 会将您带回到第一步，但不会清除表单。

我已经尝试将重置按钮标记为 Type="button"，因为单个表单要求在 Next 和 Back 按钮上使用该按钮以防止在单击按钮时提交表单，但没有看到任何变化。

我希望在单击重置时执行这两个操作，但我不确定我是否必须编写手动重置函数，或者我的代码中是否存在错误。

如有任何帮助，我们将不胜感激。谢谢!

create.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) });
  }
}

Answer 1

我也遇到了这个问题。在步进器上调用 reset 似乎只会让您回到第一步。如果您还对表单本身调用重置，则表单字段应该清除。

例子:

<form [formGroup]="formGroup" class="content-container" (ngSubmit)="onSubmit() 
#myFormGroup">
...
  <button mat-button (click)="myFormGroup.reset();stepper.reset()">Reset</button>
      </div>
    </mat-step>
  </mat-vertical-stepper>
</form>