无法使 Angular Material 具有单一表单和子组件表单的步进器正常工作

Question

我正在尝试在我们的应用程序中实现 Angular Material 步进器功能。根据文档 here 我提出了以下解决方案：

civilliability-proposal-detail.component.html

<form [formGroup]="formGroup">
  <mat-horizontal-stepper labelPosition="bottom" formArrayName="formArray" #stepper>
    <mat-step formGroupName="0" [stepControl]="formArray?.get([0])" [editable]="true">
      <div>
        <ng-template matStepLabel>{{ 'proposals.details.civilLiability.stepper.details' | translate }}</ng-template>
        <app-civilliability-step1 [model]="model.details"></app-civilliability-step1>

        <button mat-button matStepperNext type="button">Next</button>
      </div>
    </mat-step>

    <mat-step formGroupName="1" [stepControl]="formArray?.get([1])" [editable]="true">
      <div>
        <ng-template matStepLabel>{{ 'proposals.details.civilLiability.stepper.antecedents' | translate }}</ng-template>
        <!-- <app-civilliability-step2 [model]="model.questionnaire"></app-civilliability-step2> -->

        <button mat-button matStepperPrevious type="button">Back</button>
        <button mat-button matStepperNext type="button">Next</button>
      </div>
    </mat-step>
  </mat-horizontal-stepper>
</form>

civilliability-proposal-detail.component.ts

get formArray(): AbstractControl | null {
  return this.formGroup.get('formArray');
}

constructor(private formBuilder: FormBuilder) {}

ngOnInit() {
  this.buildForms();
}

buildForms() {
  this.formGroup = this.formBuilder.group({
    formArray: this.formBuilder.array([this.buildDetailsForm(), this.buildQuestionnaireForm()])
  });
}

buildDetailsForm(): FormGroup {
  if (typeof this.model === 'undefined') {
    this.model = getEmptyCivilLiabilityRequest();
  }

  const formGroup = this.formBuilder.group({
    horses: new FormControl(this.model.details.horses, Validators.min(0)),
    properties: new FormControl(this.model.details.properties, Validators.min(0)),
    garages: new FormControl(this.model.details.garages, Validators.min(0)),
    ...
  });

  return formGroup;
}

buildQuestionnaireForm(): FormGroup {
  const formGroup = this.formBuilder.group({});

  return formGroup;
}

civilliability-step1.component.html

<form [formGroup]="formGroup">
  <section class="row">
    <section class="col-md-4 full-width-form">
      <mat-form-field>
        <mat-label>{{ 'proposals.details.civilLiability.horses' | translate }}</mat-label>
        <input type="number" matInput formControlName="horses" />
        <mat-error>{{ formGroup.controls['horses'].getError('server-error') }}</mat-error>
      </mat-form-field>
    </section>
    <section class="col-md-4 full-width-form">
      <mat-form-field>
        <mat-label>{{ 'proposals.details.civilLiability.terrainsWithTrees' | translate }}</mat-label>
        <input type="number" matInput formControlName="terrainsWithTrees" />
        <mat-error>{{ formGroup.controls['terrainsWithTrees'].getError('server-error') }}</mat-error>
      </mat-form-field>
    </section>
    <section class="col-md-4 full-width-form">
      <mat-form-field>
        <mat-label>{{ 'proposals.details.civilLiability.garages' | translate }}</mat-label>
        <input type="number" matInput formControlName="garages" />
        <mat-error>{{ formGroup.controls['garages'].getError('server-error') }}</mat-error>
      </mat-form-field>
    </section>
  </section>
</form>

基于此我得到了一堆错误，我认为这些错误与我在我的表单中使用子组件这一事实有关，但我不太确定如何解决这个问题。那么，有什么建议吗？

我也读过有人 not 在步进器中使用 formArrayName，但我似乎找不到这个例子了，所以无法测试是否可行。

Answer 1

我建议在每个单独的步骤组件中声明一个表单组，而不是使用表单数组。这是我的做法：

创建一个组件来保留步进器。
为每个步骤创建一个组件，并在步骤组件中对其进行初始化。
使用 public 组件变量或定义模型来保留用户输入。
然后您可以通过数据绑定访问父步进组件中每个步进组件的 public 成员。

Live demo

无法使 Angular Material 具有单一表单和子组件表单的步进器正常工作

Can't get Angular Material Stepper with single form and child component forms working

angular

angular-material-stepper