Simpler and Cleaner Validation Error Messages for Angular Components

ngx-valdemort gives you simpler and cleaner error messages to validate your Angular components.

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Angular Library That Helps You Show Message Error | ng-error-messages

How to make use of it:

1. If you have ever written forms like the following:

<form [formGroup]="form" (ngSubmit)="submit()" #f="ngForm">
  <input formControlName="email" type="email" />
  <div class="invalid-feedback" *ngIf="form.get('email').invalid && (f.submitted || form.get('email').touched)">
    <div *ngIf="form.get('email').hasError('required')">The email is required</div>
    <div *ngIf="form.get('email').hasError('email')">The email must be a valid email address</div>
  </div>

  <input formControlName="age" type="number" />
  <div class="invalid-feedback" *ngIf="form.get('age').invalid && (f.submitted || form.get('age').touched)">
    <div *ngIf="form.get('age').hasError('required')">The age is required</div>
    <div *ngIf="form.get('age').hasError('min')">You must be at least {{ form.get('age').getError('min').min }} years old</div>
  </div>

  <button (click)="submit()">Submit</button>
</form>

2. ngx-valdemort allows writing the above form in a simpler and cleaner way using the ValidationErrors component:

<form [formGroup]="form" (ngSubmit)="submit()">
  <input formControlName="email" type="email" />
  <val-errors controlName="email">
    <ng-template valError="required">The email is required</ng-template>
    <ng-template valError="email">The email must be a valid email address</ng-template>
  </val-errors>

  <input formControlName="age" type="number" />
  <val-errors controlName="age">
    <ng-template valError="required">The age is required</ng-template>
    <ng-template valError="max" let-error="error">You must be at least {{ error.min }} years old</ng-template>
  </val-errors>

  <button>Submit</button>
</form>

3. Even better, you can define the default error messages once, use them everywhere, and still override them when needed:

<form [formGroup]="form" (ngSubmit)="submit()">
  <input formControlName="email" type="email" />
  <val-errors controlName="email" label="The email"></val-errors>

  <input formControlName="age" type="number" />
  <val-errors controlName="age" label="The age">
    <ng-template valError="max" let-error="error">You must be at least {{ error.min }} years old</ng-template>
  </val-errors>

  <button>Submit</button>
</form>

Angular Validation Error Messages, ngx-valdemort Plugin/Github, angular display error message from backend, angular error message display


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