Password Strength Meter For AngularJs

To create a password strength meter for AngularJS, you can follow these steps:

1. Create an AngularJS module and controller:

JavaScript

var app = angular.module('myApp', []);

app.controller('passwordStrengthCtrl', function($scope) {
  $scope.password = '';
  $scope.passwordStrength = '';
});

2. Create a function to calculate the password strength. You can use a regular expression to match the password against certain criteria such as length, complexity, and diversity.

JavaScript

function getPasswordStrength(password) {
  var strength = {
    value: '',
    color: ''
  };

  if (password.length < 8) {
    strength.value = 'Weak';
    strength.color = 'red';
  } else if (password.length < 12) {
    strength.value = 'Moderate';
    strength.color = 'orange';
  } else {
    strength.value = 'Strong';
    strength.color = 'green';
  }

  return strength;
}

3. Create an AngularJS watch function to update the password strength when the password value changes.

JavaScript

$scope.$watch('password', function() {
  $scope.passwordStrength = getPasswordStrength($scope.password);
});

4. Create an HTML template to display the password strength meter.

<div ng-app="myApp" ng-controller="passwordStrengthCtrl">
  <label for="password">Password:</label>
  <input type="password" id="password" ng-model="password">
  <div ng-style="{'background-color': passwordStrength.color}" class="password-strength">
    {{ passwordStrength.value }}
  </div>
</div>

In this example, we create a label and input element for the password field and bind the input value to the $scope.password variable using ng-model. We also create a div element to display the password strength meter and bind its style to the $scope.passwordStrength.color variable using ng-style. Finally, we display the password strength value inside the div element using {{ passwordStrength.value }}.

Note that this is just a basic example and you can customize the password strength calculation and display to fit your specific needs. You can also use additional criteria such as uppercase and lowercase letters, numbers, and special characters to calculate the password strength.

How to customize the password strength

To customize the password strength calculation and display, you can modify the getPasswordStrength() function from the previous example. Here are some ideas for customizing the password strength:

1. Add more criteria: You can add more criteria such as uppercase and lowercase letters, numbers, and special characters to the regular expression used in the getPasswordStrength() function. For example:

JavaScript

var lowercaseRegex = /^(?=.*[a-z])/;
var uppercaseRegex = /^(?=.*[A-Z])/;
var numberRegex = /^(?=.*\d)/;
var specialCharRegex = /^(?=.*[!@#$%^&*()_+\-=[\]{};':"\\|,.<>/?])/;

function getPasswordStrength(password) {
  var strength = {
    value: '',
    color: ''
  };

  if (password.length < 8 || !lowercaseRegex.test(password) || !uppercaseRegex.test(password) || !numberRegex.test(password) || !specialCharRegex.test(password)) {
    strength.value = 'Weak';
    strength.color = 'red';
  } else if (password.length < 12) {
    strength.value = 'Moderate';
    strength.color = 'orange';
  } else {
    strength.value = 'Strong';
    strength.color = 'green';
  }

  return strength;
}

In this example, we add four regular expressions to match lowercase and uppercase letters, numbers, and special characters. We then update the password strength calculation to check if the password meets all criteria.

2. Change the criteria weights: You can assign different weights to each criteria and calculate the password strength based on the total score. For example:

JavaScript

function getPasswordStrength(password) {
  var strength = {
    value: '',
    color: ''
  };
  
  var score = 0;
  if (password.length >= 8 && password.length < 12) {
    score += 1;
  } else if (password.length >= 12) {
    score += 2;
  }
  
  if (password.match(/[a-z]/)) {
    score += 1;
  }
  
  if (password.match(/[A-Z]/)) {
    score += 1;
  }
  
  if (password.match(/\d+/)) {
    score += 1;
  }
  
  if (password.match(/.[!,@,#,$,%,^,&,*,?,_,~,-,(,)]/)) {
    score += 1;
  }
  
  if (score < 2) {
    strength.value = 'Weak';
    strength.color = 'red';
  } else if (score < 4) {
    strength.value = 'Moderate';
    strength.color = 'orange';
  } else {
    strength.value = 'Strong';
    strength.color = 'green';
  }

  return strength;
}

In this example, we assign a score to each criteria such as password length, lowercase and uppercase letters, numbers, and special characters. We then calculate the total score and map it to the password strength level.

3. Customize the display: You can customize the password strength display using CSS. For example:

HTML

<div ng-style="{'background-color': passwordStrength.color}" class="password-strength">
  <div class="bar" ng-style="{'width': passwordStrength.score + '%'}"></div>
  <div class="text">{{ passwordStrength.value }}</div>
</div>

CSS

.password-strength {
  height: 10px;
  margin-bottom: 10px;
  position: relative;
}

.password-strength .bar {
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  background-color: #