Ways to stop multiple error messages from appearing on the Angular HTML

Greetings! Below is a code snippet from my Angular HTML file wherein I am attempting to implement an if-elseif(condition) elseif(condition) logic using ngIf and ng-container.

The goal is to display only one error message even if multiple conditions are met, instead of showing multiple error messages. However, for some reason, the current implementation is not working as expected.

For instance, when both 

formGroup.hasError('invalidPasswordStrength')
and 
formGroup.hasError('blacklistedPassword')
return true, two error messages are displayed simultaneously, which is undesired.

What I want is that when both conditions are true, only the error message related to 

formGroup.hasError('invalidPasswordStrength')
should be displayed.

I have experimented with different approaches such as:

*ngIf="formGroup.hasError('passwordConfirmation') && !(formGroup.hasError('invalidPasswordStrength') || formGroup.hasError('blacklistedPassword'))
.

While this solution works, it is not considered clean or optimal.

<ng-container *ngIf="formGroup.hasError('passwordConfirmation'); else second">
          <alert type="danger" dismissable="false">
            {{ 'VALIDATION.ERRORS.MATCHING_PASSWORDS' | translate }}
          </alert>
        </ng-container>

        <ng-container #second *ngIf="formGroup.hasError('invalidPasswordStrength'); else third">
          <alert type="danger" dismissable="false">
            {{ 'VALIDATION.ERRORS.PASSWORD_STRENGTH_INVALID' | translate }}
          </alert>
        </ng-container>

        <ng-container #third *ngIf="formGroup.hasError('blacklistedPassword'); else fourth">
          <alert type="danger" dismissable="false">
            {{ 'VALIDATION.ERRORS.PASSWORD_NOT_PERMITTED' | translate }}
          </alert>
        </ng-container>

        <ng-container #fourth *ngIf="formGroup.hasError('passwordMatchingUserDetails')">
          <alert type="danger" dismissable="false" >
            {{ 'VALIDATION.ERRORS.PASSWORD_MATCHING_USER_DETAILS' | translate }}
          </alert>
        </ng-container>
angulartypescriptangularjs-scopeangular-directive

Answer №1

Opt for an alternative approach by eliminating ngcontainers.

Consider using rather than the current method implemented here.

                      <div
                        *ngIf="aaaServerForm.get('proxy_passphrase').invalid && (aaaServerForm.get('proxy_passphrase').dirty || aaaServerForm.get('proxy_passphrase').touched)">

                        <div class="text-danger pull-left" *ngIf="aaaServerForm.get('proxy_passphrase').errors['required']">Passphrase is required.
                        </div>
                        <div class="text-danger pull-left" *ngIf="aaaServerForm.get('proxy_passphrase').errors.minlength && !aaaServerForm.get('proxy_passphrase').errors.spaceatstart && !aaaServerForm.get('proxy_passphrase').errors.spaceatend && !aaaServerForm.get('proxy_passphrase').errors.specialatstart && !aaaServerForm.get('proxy_passphrase').errors.specialatend && !aaaServerForm.get('proxy_passphrase').errors.twospace">
                          Minimum 8 character
                        </div>
                        <div class="text-danger pull-left" *ngIf="aaaServerForm.get('proxy_passphrase').errors.maxlength">
                          Maximum 64 character allowed
                        </div>
                        <div class="text-danger pull-left" *ngIf="aaaServerForm.get('proxy_passphrase').errors.spaceatstart && !aaaServerForm.get('proxy_passphrase').errors.spaceatend">
                          Should not start with a space!
                        </div>
                        <div class="text-danger pull-left" *ngIf="aaaServerForm.get('proxy_passphrase').errors.spaceatend && !aaaServerForm.get('proxy_passphrase').errors.spaceatstart">
                          Should not end with a space!
                        </div>
                        <div class="text-danger pull-left" *ngIf="aaaServerForm.get('proxy_passphrase').errors.spaceatend && aaaServerForm.get('proxy_passphrase').errors.spaceatstart">
                          Should not start & end with a space!
                        </div>
                        <div class="text-danger pull-left" *ngIf="aaaServerForm.get('proxy_passphrase').errors.noTwoSpaces && !aaaServerForm.get('proxy_passphrase').errors.spaceatstart && !aaaServerForm.get('proxy_passphrase').errors.spaceatend">
                          Consecutive spaces not allowed
                        </div>
                      </div>
                    </div>

Answer №2

It might be more efficient to centralize the logic in the validator function. Instead of having multiple validators for each error, you can consolidate them into one and prioritize the order of errors. Here's a pseudocode example:

constructor(private fb: FormBuilder) {
  this.myForm = this.fb.group({
    name: ['']
  }, { validator: this.myValidator});
}

myValidator(form: FormGroup) {
  // Start by clearing all existing errors
  if (form) {
    form.setErrors(null);
    if ('some conditions here') {
      return { 'err1': true }
    }
    if ('some conditions here') {
      return { 'err2': true }
    }
    if ('some conditions here') {
      return { 'err3': true }
    }
    return null;
  }
  return null;
}

The updated approach ensures that only one error is returned at a time, simplifying error handling.

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