Guide on Validating Several Email Addresses in a React Form using Angular 4

Question

Guide on Validating Several Email Addresses in a React Form using Angular 4

I need to input 50 email addresses with the same domain name (gmail.com).

Currently, I am using a Reactive form but the code I have implemented is not working as expected.

https://stackblitz.com/edit/angular-wfwfow

If anyone could assist me with this, I would greatly appreciate it.

emailPattern = "[a-zA-Z0-9_.+-,;]+@(?:(?:[a-zA-Z0-9-]+\.,;)?[a-zA-Z]+\.,;)?(gmail)\.com";

 ngOnInit() {
        this.accountingForm = this.fb.group({
            'day' : [null, Validators.required], 
            'email': ['',
                Validators.compose([
                    Validators.required,Validators.pattern(this.emailPattern),this.commaSepEmail
                ])
            ]
        });
    }
    commaSepEmail = (control: AbstractControl): { [key: string]: any } | null => {
        console.log("This is value:" + control.value);
        if (!_.isEmpty(control.value)){
            var emails= control.value.split(',');
            const forbidden = emails.some((email:any) => Validators.email(new FormControl(email)));
        console.log(forbidden);
        return forbidden ? { 'email': { value: control.value.trim() } } : null;
        }
    };

<form [formGroup]="accountingForm" (ngSubmit)="generateSOR(accountingForm.value)">
    <input formControlName="email" [pattern]="emailPattern" placeholder="Email Address">
    <button type="submit" mat-raised-button class="mat-primary" [disabled]="!accountingForm.valid">Generate</button>
    </form>

angular typescript

Answer 1

Answer №1

This script is designed to validate a comma-separated list of email addresses without any spaces in between. The presence of a trailing comma is acceptable. For instance:

<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="73191c1633161e121a1f5d101c">[email protected]</a>,<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="9cf6f5fafae5dcfff3f7f9b2ecf9fdef">[email protected]</a>

. This is equivalent to

<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="a7cdc8c2e7c2cac6cecb89c4c8">[email protected]</a>,<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="ef8586898996af8c80848ac19f8a8e9c">[email protected]</a>,

. Note that the final comma does not affect the validation. Additionally, there should be no spaces present.

 sendEmailForm: FormGroup;

  emailList: string [];

  ngOnInit(): void {
    this.emailList = [];
    const toAddress = new FormControl('', [
      Validators.required,
      Validators.pattern(/^([\w+-.%]+@[\w-.]+\.[A-Za-z]{2,4},?)+$/)
    ]);

    this.sendEmailForm = new FormGroup({
      toAddress: toAddress
    });
  }
  extractEmailList(e){
    this.emailList = [];
    if(this.sendEmailForm.valid) {     
      let emails = e.split(',');
      emails.forEach(email => {
        if(email && email.length > 0) {
          this.emailList.push(email);
        }
      });
    }
    console.log(this.emailList);
  }

In the view, you can implement validations as shown below.

<form [formGroup]="sendEmailForm" (ngSubmit)="onSubmit($event)">
    <div class="form-group required">
      <span class="label label-primary">Email(s):</span>
      <input
      (ngModelChange)="extractEmailList($event)"
        type="text"
        [formControl]="sendEmailForm.controls['toAddress']"            
        value=""
        maxlength="150"
        name="toAddress"
        class="form-control"
      />
    </div>
    <small
    *ngIf="sendEmailForm.controls['toAddress'].hasError('required') && sendEmailForm.controls['toAddress'].touched"
    class="form-error-msg">
    Valid email is required to send an invitation.
  </small>
    <small
    *ngIf="sendEmailForm.controls['toAddress'].hasError('pattern') && sendEmailForm.controls['toAddress'].touched"
    class="form-error-msg">
    Please enter comma separated list of valid email addresses without spaces in between. No comma is required after last email.
  </small>
      <button type="submit" [disabled]="!sendEmailForm.valid" class="btn btn-primary btn-simple" >Invite</button>
      <small class="form-error-msg">{{emailList.length}} email(s) will be sent.</small>
  </form>

In your onSubmit() method, you can retrieve values from the emailList directly, eliminating the need to fetch them from the form.

Answer 2

This script is designed to validate a comma-separated list of email addresses without any spaces in between. The presence of a trailing comma is acceptable. For instance:

<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="73191c1633161e121a1f5d101c">[email protected]</a>,<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="9cf6f5fafae5dcfff3f7f9b2ecf9fdef">[email protected]</a>

. This is equivalent to

<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="a7cdc8c2e7c2cac6cecb89c4c8">[email protected]</a>,<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="ef8586898996af8c80848ac19f8a8e9c">[email protected]</a>,

. Note that the final comma does not affect the validation. Additionally, there should be no spaces present.

 sendEmailForm: FormGroup;

  emailList: string [];

  ngOnInit(): void {
    this.emailList = [];
    const toAddress = new FormControl('', [
      Validators.required,
      Validators.pattern(/^([\w+-.%]+@[\w-.]+\.[A-Za-z]{2,4},?)+$/)
    ]);

    this.sendEmailForm = new FormGroup({
      toAddress: toAddress
    });
  }
  extractEmailList(e){
    this.emailList = [];
    if(this.sendEmailForm.valid) {     
      let emails = e.split(',');
      emails.forEach(email => {
        if(email && email.length > 0) {
          this.emailList.push(email);
        }
      });
    }
    console.log(this.emailList);
  }

In the view, you can implement validations as shown below.

<form [formGroup]="sendEmailForm" (ngSubmit)="onSubmit($event)">
    <div class="form-group required">
      <span class="label label-primary">Email(s):</span>
      <input
      (ngModelChange)="extractEmailList($event)"
        type="text"
        [formControl]="sendEmailForm.controls['toAddress']"            
        value=""
        maxlength="150"
        name="toAddress"
        class="form-control"
      />
    </div>
    <small
    *ngIf="sendEmailForm.controls['toAddress'].hasError('required') && sendEmailForm.controls['toAddress'].touched"
    class="form-error-msg">
    Valid email is required to send an invitation.
  </small>
    <small
    *ngIf="sendEmailForm.controls['toAddress'].hasError('pattern') && sendEmailForm.controls['toAddress'].touched"
    class="form-error-msg">
    Please enter comma separated list of valid email addresses without spaces in between. No comma is required after last email.
  </small>
      <button type="submit" [disabled]="!sendEmailForm.valid" class="btn btn-primary btn-simple" >Invite</button>
      <small class="form-error-msg">{{emailList.length}} email(s) will be sent.</small>
  </form>

In your onSubmit() method, you can retrieve values from the emailList directly, eliminating the need to fetch them from the form.

Answer 3

Answer №2

After analyzing the problem with the disabled button, I have identified a potential solution. Instead of utilizing a string format for the emailPattern, consider switching to regex format.

Modify your code from:

emailPattern = "[a-zA-Z0-9_.+-,;]+@(?:(?:[a-zA-Z0-9-]+\.,;)?[a-zA-Z]+\.,;)?(gmail)\.com";

To:

emailPattern = /[a-zA-Z0-9_.+-,;]+@(?:(?:[a-zA-Z0-9-]+\.,;)?[a-zA-Z]+\.,;)?(gmail)\.com/;

This adjustment should rectify the issue. You may need to refine the regex pattern further to align with your specific requirements, but it will address the button's disabled status.

In my experience, using regex expressions over strings whenever feasible is preferred as they tend to be more readable and efficient.

Answer 4

After analyzing the problem with the disabled button, I have identified a potential solution. Instead of utilizing a string format for the emailPattern, consider switching to regex format.

Modify your code from:

emailPattern = "[a-zA-Z0-9_.+-,;]+@(?:(?:[a-zA-Z0-9-]+\.,;)?[a-zA-Z]+\.,;)?(gmail)\.com";

To:

emailPattern = /[a-zA-Z0-9_.+-,;]+@(?:(?:[a-zA-Z0-9-]+\.,;)?[a-zA-Z]+\.,;)?(gmail)\.com/;

This adjustment should rectify the issue. You may need to refine the regex pattern further to align with your specific requirements, but it will address the button's disabled status.

In my experience, using regex expressions over strings whenever feasible is preferred as they tend to be more readable and efficient.

Answer 5

Answer №3

All the email validation logic is contained within the emailValidator function, which handles individual email validation as well as enforcing a maximum number of emails. To integrate this into a form, add the following code to the initialization:

recipients: [null, [multipleEmailValidator(20)]],

Implementation example:

import { AbstractControl, ValidatorFn } from '@angular/forms';

export function multipleEmailValidator(max: number): ValidatorFn {
  return (control: AbstractControl): { [key: string]: any } | null => {
    let emails = control.value ? control.value.split(',') : [];
    const emailPattern = /^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,4}$/;
    const invalidEmails = emails.filter(email => !emailPattern.test(email.trim()));
    if (invalidEmails.length) {
      return invalidEmails.length ? { 'invalidEmail': { value: invalidEmails } } : null;
    } else {
      emails = emails.filter(email => email.trim());
      return emails.length > max ? { 'maxEmails': { value: emails.length } } : null;
    }
  };
}

Answer 6

All the email validation logic is contained within the emailValidator function, which handles individual email validation as well as enforcing a maximum number of emails. To integrate this into a form, add the following code to the initialization:

recipients: [null, [multipleEmailValidator(20)]],

Implementation example:

import { AbstractControl, ValidatorFn } from '@angular/forms';

export function multipleEmailValidator(max: number): ValidatorFn {
  return (control: AbstractControl): { [key: string]: any } | null => {
    let emails = control.value ? control.value.split(',') : [];
    const emailPattern = /^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,4}$/;
    const invalidEmails = emails.filter(email => !emailPattern.test(email.trim()));
    if (invalidEmails.length) {
      return invalidEmails.length ? { 'invalidEmail': { value: invalidEmails } } : null;
    } else {
      emails = emails.filter(email => email.trim());
      return emails.length > max ? { 'maxEmails': { value: emails.length } } : null;
    }
  };
}

Guide on Validating Several Email Addresses in a React Form using Angular 4

Answer №1

Answer №2

Answer №3

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