Tips for ensuring the angular FormArray is properly validated within mat-step by utilizing [stepControl] for every mat-step

When using Angular Material stepper, we can easily bind form controls with form groups like

[stepControl]="myFormGroup"
. But how do we bind a FormArray inside a formGroup?

Constructor

constructor(private _fb: FormBuilder){}

FormArray inside FormGroup

 this.myFormGroup = this._fb.group({
      skills: this._fb.array([this.init()])
    }

This is the init function to create a new formGroup

 init(){
    return this._fb.group({
      skill1: ['', Validators.required],
      skill2: ['', Validators.required],
      skill3: ['', Validators.required],
      skill4: ['', Validators.required],
    })
 }

This is my code for mat-step

<mat-stepper linear #stepper>
  <mat-step [stepControl]="myFormGroup" [editable]="isEditable">
    <form [formGroup]="myFormGroup">
      <ng-template matStepLabel>Fill out your name</ng-template>

     // Form Fields Goes here

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

Now the issue is how can I set [stepControl] to my FormArray which is skills? If the skills are not valid, it should prevent moving to the next step.

Answer №1

I discovered a helpful resolution.

Develop a new function within the component.ts script

fetch myFormGroupItems() {
    return this.myFormGroup.get('skills') as FormArray
    }

Implement this method in your mat-step as shown below

[stepControl]="myFormGroupItems"

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