I've been working on implementing Custom Dynamic Forms in Angular 2, and I successfully added functionalities like Delete and Cancel to the existing Save feature.
After making all the necessary changes in Plunker, I encountered errors when trying to replicate the implementation on my local system.
You can view the working code on Plunker: http://plnkr.co/edit/SL949g1hQQrnRUr1XXqt?p=preview
Here are the error messages I received: https://i.sstatic.net/kwAro.png
The HTML code where the error occurs is:
<div>
<form [formGroup]="form">
<div *ngFor="let question of questions" class="form-row">
<label [attr.for]="question.key">{{question.label}}</label>
<div [ngSwitch]="question.controlType">
<input *ngSwitchCase="'textbox'" [formControlName]="question.key"
[id]="question.key" [type]="question.type" [(ngModel)]="question.value">
<select [id]="question.key" [(ngModel)]="question.value" *ngSwitchCase="'dropdown'" [formControlName]="question.key" >
<option *ngFor="let opt of question.options" [ngValue]="opt.key" >{{opt.value}}</option>
</select>
<input *ngSwitchCase="'checkbox'" [(ngModel)]="question.value"
[id]="question.key" [type]="question.type" (change)="question.value = ck.checked" #ck [ngModelOptions]="{standalone: true}">
</div>
<div class="errorMessage" *ngIf="!form.controls[question.key].valid">{{question.label}} is required</div>
</div>
<div class="form-row">
<button type="submit" [disabled]="!form.valid" (click)="onSubmit()">Save</button>
<button type="button" class="btn btn-default" (click)="cancel()">Cancel</button>
<button type="button" class="btn btn-default" (click)="clear()">Clear</button>
</div>
</form>
<div *ngIf="payLoad" class="form-row">
<strong>Saved the following values</strong><br>{{payLoad}}
</div>
</div>