How can you display a single error message using Reactive Forms?

In Angular 7, I have implemented a Reactive Form with an input field named email. This input field is configured with two validators as shown below:

email: ['', [Validators.email, Validators.pattern('^[\\w._]+@company(.com|.go|.jet)')]],

Each validator has an associated error message in the template:

<label for="email" class="error-msg" *ngIf="authForm.get('email').hasError('email')  && hideFocus">Your email is invalid</label>
<label for="email" class="error-msg" *ngIf="authForm.get('email').hasError('pattern')  && hideFocus">Only emails ending with .com .go and .jet are allowed</label>

Currently, when the user inputs text into the field, both error messages are displayed simultaneously.

Is there a way to show only one error message at a time? Can this be achieved?

javascriptangulartypescriptangular-reactive-formsangular7

Answer №1

In the event that both errors are produced (due to the input not meeting either of the validation criteria), one option is to utilize an ngIf-else switch to showcase the preferred error message first. You can see a demonstration of this concept here.

Answer №2

To tackle this issue, it's beneficial to incorporate a logical operator. By verifying if one error is invalid while another is valid, you can simplify the process. Although the theory may seem daunting, an example is provided below:

<label for="email" class="error-msg" *ngIf="authForm.get('email').hasError('email')  && hideFocus">Your email is invalid</label>
<label for="email" class="error-msg" *ngIf="!authForm.get('email').hasError('email') && authForm.get('email').hasError('pattern')  && hideFocus">Only emails ending with .com .go and .jet are allowed</label>

If you are unfamiliar with reactive forms, make sure to carefully follow the provided syntax, as I am using ngForm. The fundamental concept behind this approach is to display one error at a time by checking for the validity of one error alongside the invalidity of another.

Your efforts in providing an edit with the correct syntax would be greatly valued.

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