Nancy's Secrets

nancys_secrets.js

//----------------------------//
// GLOBAL CONSTANTS
//----------------------------//
var UPPERS = ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'];
var LOWERS = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'];
var NUMS = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9'];
var SPECIALS = ['!', '#', '$', '%', '&', '(', ')', '*', '+', '-', '.', '/', ':', ';', '<', '=', '>', '?', '@'];

var OPTIONS = [
  {
    prompt: 'Do you want lowercase letters in your password?',
    set: LOWERS
  },
  {
    prompt: 'Do you want upper case letters in your password?',
    set: UPPERS
  },
  {
    prompt: 'Do you want numbers in your password?',
    set: NUMS
  },
  {
    prompt: 'Do you want special characters in your password?',
    set: SPECIALS
  }
];

//----------------------------//
// METHODS
//----------------------------//
function getLengthOfPassword() {
  var length = prompt('Your password must be a number between 8 and 128.');

  length = parseInt(length, 10);
  // EXTRA CREDIT: Validate to make sure only numbers are entered. Use regex?

  if (!length) return; // NOTE: return so not stuck in recursive loop.

  if (length < 8 || length > 128) {
    alert("Your password must be between 8 and 128");
    length = getLengthOfPassword();
  }

  return length;
}

function getCharacterSet() {
  var characterSet = [];

  for (var i = 0; i < OPTIONS.length; i++) {
    var confirmation = confirm(OPTIONS[i].prompt);

    if (confirmation) { characterSet = characterSet.concat(OPTIONS[i].set); }
  }

  // NOTE: This causes an endless loop if user never selects one.
  if (characterSet.length === 0) {
    alert('You must choose at least one.');
    getCharacterSet();
  }

  return characterSet;
}

function getPassword(length, characterSet) {
  var password = '';
  var setLength = characterSet.length;

  for (var i = 0; i < length; i++) {
    var index = Math.floor(Math.random() * setLength);

    password += characterSet[index];
  }

  return password;
}

function writePassword(password) {
  document.querySelector('#password').value = password;
}

function generatePassword() {
  var length = getLengthOfPassword();
  if (!length) return;

  var characterSet = getCharacterSet();
  var password = getPassword(length, characterSet);
  writePassword(password);
}

//----------------------------//
// EVENT LISTENERS
//----------------------------//
document.querySelector('#generate').addEventListener('click', generatePassword);