在线性 mat-h​​orizo​​ntal-stepper 中使用单独的组件

Question

在 Angular 中，是否可以有一个线性步进器，其中各个步骤是单独的组件？例如：

<mat-horizontal-stepper [linear]="isLinear">
    <mat-step [stepControl]="firstFormGroup" label="Some Form">
        <first-component></first-component>
    </mat-step>
    <mat-step [stepControl]="secondFormGroup" label="Another Form">
        <second-component></second-component>
    </mat-step>
    <mat-step [stepControl]="thirdFormGroup" label="Review">
        <third-component></third-component>
    </mat-step>
</mat-horizontal-stepper>

当我尝试这个时，我在点击matStepperNext按钮时收到以下错误：

TypeError: Cannot read property 'invalid' of undefined.

Answer 1

这是对我有用的解决方案。

<mat-horizontal-stepper [linear]="true" #stepper>
  <mat-step [stepControl]="selectAdvType">
    <ng-template matStepLabel>
      <div class="text-center">
        <mat-icon>queue_play_next</mat-icon><br /><span>Select Adv Type</span>
      </div>
    </ng-template>
    <app-advertisement-type></app-advertisement-type>
  </mat-step>
  <mat-step [stepControl]="selectAdvType">
    <ng-template matStepLabel>
      <div class="text-center">
        <mat-icon>directions_car</mat-icon><br /><span>Select Car</span>
      </div>
    </ng-template>
    <app-select-car-adv></app-select-car-adv>
  </mat-step>
  <mat-step>
    <ng-template matStepLabel>
      <div class="text-center">
        <mat-icon>description</mat-icon><br /><span>Select Features</span>
      </div>
    </ng-template>
    <div>
      <button mat-button matStepperPrevious>Back</button>
      <button mat-button (click)="stepper.reset()">Reset</button>
    </div>
  </mat-step>
</mat-horizontal-stepper>

父 Ts 文件

@Component({
  selector: 'app-customer.create.advertisement',
  templateUrl: './customer.create.advertisement.component.html',
  styleUrls: ['./customer.create.advertisement.component.scss']
})
export class CustomerCreateAdvertisementComponent implements OnInit {
  isLinear = false;
  selectAdvType: FormGroup;
  constructor(private _formBuilder: FormBuilder) { }
  ngOnInit() {
    this.selectAdvType = this._formBuilder.group({
      firstCtrl: ['', Validators.required]
    });
  }
}

子组件

<form [formGroup]="firstFormGroup">
    <ng-template matStepLabel>Fill out your name</ng-template>
    <mat-form-field>
        <input matInput placeholder="Last name, First name" formControlName="firstCtrl" required>
    </mat-form-field>
    <div>
        <button mat-button matStepperNext>Next</button>
    </div>
</form>


@Component({
  selector: 'app-advertisement-type',
  templateUrl: './advertisement-type.component.html',
  styleUrls: ['./advertisement-type.component.scss']
})
export class AdvertisementTypeComponent implements OnInit {
  firstFormGroup: FormGroup;
  constructor(private _formBuilder: FormBuilder) { }

  ngOnInit() {
    this.firstFormGroup = this._formBuilder.group({
      firstCtrl: ['', Validators.required]
    });
  }

}

Answer 2

您可以使用子表单来解决它。几个月前，我实际上在 Angular-UP 会议上发表了关于它的演讲：https : //www.youtube.com/watch?v=sb7tgsNF2Jk

思路，一般来说，就是在子组件中创建表单，使用DI注入controlContainer，并将本地表单设置为controlContainer表单。

子组件：

 @Component({
  selector: 'app-company-info',
  templateUrl: './company-info.component.html',
  styleUrls: ['./company-info.component.scss'],
  viewProviders: [{ provide: ControlContainer, useExisting: FormGroupDirective }]
})
export class CompanyInfoComponent implements OnInit {

  form: FormGroup;
  constructor(
    private ctrlContainer: FormGroupDirective,
    private fb: FormBuilder) { }

  ngOnInit() {

    this.form = this.ctrlContainer.form;

    this.form.addControl('company',
      this.fb.group({
        'companyName': this.fb.control(null, [Validators.required]),
        'numOfEmployees': this.fb.control(null, [Validators.required])});

  }

}

父组件（html）：

<mat-horizontal-stepper [linear]="isLinear" #stepper>
  <mat-step [stepControl]="companyInfo">
    <ng-template matStepLabel>Fill out your name</ng-template>

    <form [formGroup]="companyInfo">
      <app-company-info></app-company-info>
    </form>

    <div>
      <button mat-button matStepperNext>Next</button>
    </div>
  </mat-step>
</mat-horizontal-stepper>

父组件（ts）：

export class WizardComponent implements OnInit {

  isLinear = true;
  companyInfo: FormGroup;

  constructor(private _formBuilder: FormBuilder) {

  }

  ngOnInit() {

    this.companyInfo = this._formBuilder.group({
    });

  }

}

Answer 3

改进@eliran-eliassy 答案和@christian-steinmeyer 问题。

父组件.ts

  export class ParentComponent implements OnInit {

  isLinear = true;
  companyInfo: FormGroup;

  constructor(private _formBuilder: FormBuilder) {

  }

  ngOnInit() {

    this.companyInfo = this._formBuilder.group({
    });

  }

}

父组件.html

<mat-horizontal-stepper [linear]="isLinear" #stepper>
    <mat-step [stepControl]="companyInfo">
        <form [formGroup]="companyInfo">
            <ng-template matStepLabel>Fill out your name</ng-template>
            <app-company-info></app-company-info>
        </form>
        <div>
            <button mat-button matStepperNext>Next</button>
        </div>
    </mat-step>
</mat-horizontal-stepper>

Child.Component.ts -> 这是子表单

export class ChildComponent implements OnInit {
  form: FormGroup;
  subForm: FormGroup;
  constructor(
    private ctrlContainer: FormGroupDirective,
    private fb: FormBuilder
  ) {}

  ngOnInit() {
    this.subForm = this.fb.group({
      companyName: [null, [Validators.required]],
      numOfEmployees: [null, [Validators.required]]
    });
    
    this.form = this.ctrlContainer.form;
    this.form.addControl("company", this.subForm);
  }
}

Child.Component.html

<div [formGroup]="subForm">
    <mat-form-field appearance="outline">
        <input matInput placeholder="Your Company Name" formControlName="companyName">
  </mat-form-field>
</div>

在stackblitz上查看此解决方案