Validation of phone number pattern in Angular's reactive forms

Question

Validation of phone number pattern in Angular's reactive forms

Currently, I am working on a reactive form that includes an input field for phone numbers. To ensure the format is consistent throughout, I have implemented a pipe that converts the input from 9999999999 to (999) 999-9999, along with using a regex pattern for validation.

HTML Code Snippet:

<input [value]="form.get('phone').value | phoneFormat" maxlength="14" formControlName="phone"/>

The "phoneFormat" pipe is responsible for transforming the input.

Component Setup:

this.form = this.formBuilder.group({
  phone: ['', [Validators.pattern(/((\(\d{3}\) ?)|(\d{3}-))?\d{3}-\d{4}/)]]
});

Challenges Faced:

When saving the form, there is a need to revert the phone value back to 9999999999.
During editing, the initial failure of pattern validation occurs because the phone number does not match the desired format.

I am seeking a more efficient approach to tackle these issues in this particular scenario.

angular typescript angular-reactive-forms

Answer 1

Answer №1

This validation method does not require the use of pipes for converting or transforming values. Instead, it utilizes the mask validation feature provided by RxWeb.

The mask validation in @rxweb/reactive-form-validators can meet your validation needs by validating input based on a specified regex format and storing the value in its original form (e.g., 9999999999).

export class UserComponent implements OnInit {
    userFormGroup: FormGroup

    constructor(
        private formBuilder: FormBuilder ) { }

    ngOnInit() {
        this.userFormGroup = this.formBuilder.group({
            phoneNumber:['', RxwebValidators.mask({mask:'(999)-999 9999' })], 
        });
    }

    onSubmit(){
      console.log(this.userFormGroup.value);
    }
}

<div>
  <form  [formGroup]="userFormGroup">
    <div class="form-group">
      <label>Phone Number</label>
      <input type="text" formControlName="phoneNumber" class="form-control"  />
     <small class="form-text text-danger" *ngIf="userFormGroup.controls.phoneNumber.errors">                     {{userFormGroup.controls.phoneNumber.errors.mask.message}}<br/></small>    
    </div>
    <button [disabled]="!userFormGroup.valid" class="btn btn-primary" (click)="onSubmit()">Submit</button>
  </form>
</div>

To implement this, you will need to import RxReactiveFormsModule in the main module and utilize RxWebValidators during formControl initialization.

Here is the link to a stackblitz example showcasing the above implementation : Open

Answer 2

This validation method does not require the use of pipes for converting or transforming values. Instead, it utilizes the mask validation feature provided by RxWeb.

The mask validation in @rxweb/reactive-form-validators can meet your validation needs by validating input based on a specified regex format and storing the value in its original form (e.g., 9999999999).

export class UserComponent implements OnInit {
    userFormGroup: FormGroup

    constructor(
        private formBuilder: FormBuilder ) { }

    ngOnInit() {
        this.userFormGroup = this.formBuilder.group({
            phoneNumber:['', RxwebValidators.mask({mask:'(999)-999 9999' })], 
        });
    }

    onSubmit(){
      console.log(this.userFormGroup.value);
    }
}

<div>
  <form  [formGroup]="userFormGroup">
    <div class="form-group">
      <label>Phone Number</label>
      <input type="text" formControlName="phoneNumber" class="form-control"  />
     <small class="form-text text-danger" *ngIf="userFormGroup.controls.phoneNumber.errors">                     {{userFormGroup.controls.phoneNumber.errors.mask.message}}<br/></small>    
    </div>
    <button [disabled]="!userFormGroup.valid" class="btn btn-primary" (click)="onSubmit()">Submit</button>
  </form>
</div>

To implement this, you will need to import RxReactiveFormsModule in the main module and utilize RxWebValidators during formControl initialization.

Here is the link to a stackblitz example showcasing the above implementation : Open

Answer 3

Answer №2

Why are you altering the form saving process?

Instead of changing the form value directly, consider retrieving the form value, assigning it to an object, and then transforming it as needed.

save() {
    let formValue = this.form.value;
    formValue.phoneNumber = formValue.phoneNumber.match(/(\d+)/);
    // carry on with the task
}

If there is a situation where you need to modify the form value (if applicable), start by normalizing the phone number to a valid format before updating the form value.

normalize(val) {
    let formValue = val;
    const phoneFormatPipe = new phoneFormat();
    formValue.phoneNumber = phoneFormatPipe.transform(formValue.phoneNumber);
    this.form.patchValue(formValue);
}

Answer 4

Why are you altering the form saving process?

Instead of changing the form value directly, consider retrieving the form value, assigning it to an object, and then transforming it as needed.

save() {
    let formValue = this.form.value;
    formValue.phoneNumber = formValue.phoneNumber.match(/(\d+)/);
    // carry on with the task
}

If there is a situation where you need to modify the form value (if applicable), start by normalizing the phone number to a valid format before updating the form value.

normalize(val) {
    let formValue = val;
    const phoneFormatPipe = new phoneFormat();
    formValue.phoneNumber = phoneFormatPipe.transform(formValue.phoneNumber);
    this.form.patchValue(formValue);
}

Validation of phone number pattern in Angular's reactive forms

Answer №1

Answer №2

Similar questions

Why injecting a service into a class in Angular may not be the best practice and what alternatives you should consider instead

Share your Angular Elements web component as an npm module

Will adding additional line breaks increase the overall length of the code?

Steps for generating a PDF using the content of an Angular view

Issue with button functionality in Angular 7 carousel slider

Module augmentations do not allow for exports or export assignments

Guide on transforming a Unix timestamp into either "2000-01-01" or "2000-05-24 20:00:00" format, or the opposite way, using Deno

What is the best way to loop through an HTMLCollection?

The Angular 7 CLI fails to implement the angular.json schematics options in an Ionic 4 project

Utilizing interfaces, unlocking keys, and allocating assignments

When attempting to specify the path in the angular.json file, Angular encounters difficulty accessing Bootstrap from the node_modules directory

After saving the document, the newly added autocomplete items do not appear in the autocomplete list

"Triggering the repetition of a single action through ngrx dispatch in

Error message: Unable to locate provider for @Attribute('sampleString')

ERROR: The request for URL /Angular2 resulted in an HTTP status of 404, indicating that the resource could

Safari encountering parsing date error

Connecting Angular forms to retrieve form data using email

Exploring the concept of class inheritance in Node.js using TypeScript

Dealing with Type Casting Problems Following the Migration to Angular 4

Tips for managing a list of strings with a maximum length: Automatically remove the first string from the list when a new one