Using separate components in a linear mat-horizontal-stepper

user_2530111 0
Viewed 15071

In Angular, is it possible to have a linear stepper where the individual steps are separate components? For example:

<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>

When I try this, I receive the following error upon hitting the matStepperNext button:

TypeError: Cannot read property 'invalid' of undefined.

angular-material-stepper angular-material2 angular-material angular
4 Answers

You can use sub-forms to resolve it. I actually gave a talk a few months ago in Angular-UP conference about it: https://www.youtube.com/watch?v=sb7tgsNF2Jk

The idea, in general, is to create the form in the child component, inject the controlContainer using DI and setting the local form to be the controlContainer form.

Child Component:

 @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])});

  }

}

Parent Component (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>

Parent Component (ts):

export class WizardComponent implements OnInit {

  isLinear = true;
  companyInfo: FormGroup;

  constructor(private _formBuilder: FormBuilder) {

  }

  ngOnInit() {

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

  }

}
user_54856750

Here is the solution that work for me.

<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>

Parent Ts file

@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]
    });
  }
}

Child component

<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]
    });
  }

}
user_11624090

Improving on @eliran-eliassy answer and @christian-steinmeyer question.

Parent.Component.ts

  export class ParentComponent implements OnInit {

  isLinear = true;
  companyInfo: FormGroup;

  constructor(private _formBuilder: FormBuilder) {

  }

  ngOnInit() {

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

  }

}

Parent.Component.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 -> this is the sub-form

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>

See this solution on stackblitz

user_57651880

Ok, I think I see a few issues:

<mat-horizontal-stepper [linear]="isLinear">
  <mat-step [stepControl]="foodFormGroup">
    <food-selection></food-selection>
  </mat-step>
  <mat-step [stepControl]="pieFormGroup">
    <pie-selection></pie-selection>
  </mat-step>
</mat-horizontal-stepper>

foodFormGroup and pieFormGroup need to be defined in your tough-choice.component.ts file (Which, btw is misspelled in your example code)

Here's an example (from the docs) of how this might look:

import {Component} from '@angular/core';
import {FormBuilder, FormGroup, Validators} from '@angular/forms';

/**
 * @title Stepper overview
 */
@Component({
  selector: 'stepper-overview-example',
  templateUrl: 'stepper-overview-example.html',
  styleUrls: ['stepper-overview-example.css']
})
export class StepperOverviewExample {
  isLinear = false;
  firstFormGroup: FormGroup;
  secondFormGroup: FormGroup;

  constructor(private _formBuilder: FormBuilder) { }

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

Also, I don't see a module.ts file in your example. That's where you would want to import your @angular/material modules, not in the component files.

I'd suggest just giving the Angular Material documentation a once-over. https://material.angular.io/components/stepper/overview

user_35819320
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