Challenge 03 - Password Generator

Purpose

This is "Challenge 03" of the University of Adelaide Coding Bootcamp. The task is to create a random password generator using Javascript. The password is generated based on user's input:

• Password length (min 8 to max 128 char)
• Character types -- Uppercase, Lowercase, Numbers and Special Characters

Technologies used

• HTML5 and Javascript
• Uses arrays and the Math.random() function

URL of the application

https://shiham-jamaldeen.github.io/Challenge03/

Preview of the application

Instructions to use the application

1. Enter the URL to your browser window: https://shiham-jamaldeen.github.io/Challenge03/
2. Select the Generate Password button.
3. Enter the length of the desired password.

   Note: The system accepts no more than 8 characters minimum and a maximum of 128 characters.

4. Enter what type of characters to include in the password.

   Note: Your password may contain a combination of Uppercase, Lowercase, Numbers and Special Characters.
   
   The following input is required:

   • Include Uppercase characters in the password? (OK = Yes or Cancel = No)
   • Include Lowercase characters in the password? (OK = Yes or Cancel = No)
   • Include Numbers in the password? (OK = Yes or Cancel = No)
   • Include Special characters in the password? (OK = Yes or Cancel = No)

5. The password is generated (based on the password requirements in 4) and displayed in the text box.

Algorithm

The function generatePassword() has the following logic:

1. User enters the desired password length
   • Check the password length is between 8 to 128 characters
   • If not, display ERROR MESSAGE and request user to re-enter password length
2. User enters the required type of characters -- Uppercase char, Lowercase char, Numbers AND/OR Special char in the password.
   • Check if at least one type of character is present.
   • If not present, display ERROR MESSAGE and request user to re-enter the desired type of character -- Uppercase char, Lowercase char, Numbers AND/OR Special char
3. Check the required character type
4. Build a userChoiceArray for each character type, selected by the user
5. Obtain a random number from the Random Number Generator function
6. Use the random number as the "index"
7. Retrieve "elements" from the userChoiceArray, with the index generated in step 6
8. Print the element (of the userChoiceArray) to a variable (Note This will be the password generated)
9. Repeat steps 5 to 8 until the desired password length is achieved