Angular – How to Handle Password Confirmation Logic

Password Confirmation Logic in Angular Form

This blog represents code samples and related concepts on how to handle password confirmation logic in an Angular app (Angular 2/Angular 4). Note that the code samples make use of template-driven forms and uses [(ngModel)] for two-way data bindings.

Following are key aspects discussed in this blog:

  • Template code for handling password confirmation logic
  • Component code for handling password confirmation logic
  • Signup model code

In this blog, it is considered that password confirmation logic is a key part of signup form. Thus, a model name Signup is used. However, the logic can also be used in update password form.

Following screenshot represents password confirmation UI related with the code given in this blog:

Password Confirmation Logic in Angular Form

Figure 1. Password Confirmation Logic in Angular Form

Template Code for handling Password Confirmation Logic

<div class="form-group">
  <label for="password"><strong>Password</strong></label>
  <input type="password" class="form-control" id="password" [(ngModel)]="signup.password" name="password" (blur)="confirmPassword()" required placeholder="Password" #pswd="ngModel"/>
</div>


<div [hidden]="pswd.valid || pswd.pristine" class="alert alert-danger">Password is required</div>


<div class="form-group">
  <label for="cnfpassword"><strong>Confirm password</strong></label>
  <input type="password" class="form-control" id="cnfpassword" [(ngModel)]="passwordConfirmationTxt" required (blur)="confirmPassword()" name="passwordConfirmationTxt"/>
</div>


<div [hidden]="!passwordConfirmationFailed" class="alert alert-danger">Password did not match</div>

Pay attention to some of the following in above code:

  • Usage of (blur) event handler to invoke the method, confirmPassword
  • Usage of template reference variable #pswd for tracking changes to required field, password
  • Usage of passwordConfirmationFailed property to display the message “Password did not match” based on the whether its value is true or flag. Note the usage of [hidden]

Component Code for handling Password Confirmation Logic

export class SignupComponent {
  passwordConfirmationFailed = false;
  passwordConfirmationTxt = '';

  signup = new Signup('', '', '', '');

  confirmPassword() {
    if (this.signup.password === this.passwordConfirmationTxt) {
      this.passwordConfirmationFailed = false;
    } else {
      this.passwordConfirmationFailed = true;
    }
  }
}

Signup Model Code

export class Signup {

  constructor (
    public email: string,
    public name: string,
    public password: string,
    public country: string,
  ) {  }

}

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Ajitesh Kumar
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Ajitesh Kumar

I have been recently working in the area of Data analytics including Data Science and Machine Learning / Deep Learning. I am also passionate about different technologies including programming languages such as Java/JEE, Javascript, Python, R, Julia, etc, and technologies such as Blockchain, mobile computing, cloud-native technologies, application security, cloud computing platforms, big data, etc. For latest updates and blogs, follow us on Twitter. I would love to connect with you on Linkedin. Check out my latest book titled as First Principles Thinking: Building winning products using first principles thinking
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