Ajax, jQuery, JSON and REST API for CodeIgniter Web Application

This coursework assignment involves extending a PHP CodeIgniter application to include user accounts, posting, commenting, and voting features. The assignment requires the use of Ajax/JQuery, REST/API, and JSON technologies to implement logging in and voting features. Specifically, when a user votes (upvote or downvote), the client-side page should use Ajax to send the vote to a REST API on the server and get back the new vote result. Similarly, the user should be able to login via a form in the home page that uses Ajax and a REST API to update the page with the result of logging-in (displaying the user's username and inserting a link to their profile page).

It’s a php CodeIgniter and the first part completed. I only need
to get help on the ajax, jquery, json and REST api to work in
this assignment. All the information and steps are written
Below.
To install the code follow these instructions.
1. Download a zip file and extract if needed.
2. UNZIP the file.
3. Edit the config/database.php file to match localhost if needed
connection details.
4. Edit the config/config.php file to set the base_url value.
5. Use an FTP program to copy it into a directory in your directory on
the server
6. Set up your database tables on the database server. Copy the
contents of create.sql. Then open PHPMyAdmin database account.
Click on the 'SQL' tab and paste the SQL code into the SQL editor.
Run the code to set up the tables.
7. Now check that the application runs by typing a URL or localhost.
8. If you have any questions or problem, then contact me by email at
[e-mail]

Coursework Description
Introduction
For this coursework, you will extend the web application included in the file attached.
For this coursework, you need to extend the web application to include the following features:
1. User accounts – users should be able to register to create an account, consisting of a
username and password, and should be able to login. They should also be able to see a
profile page, which shows their posts and comments, and a user score, based on the
upvoting/downvoting of their posts and comments.
2. Posting, commenting and voting is only be allowed for logged-in users. If a user has not
logged in, they should not be able to post, comment or vote. However, they can read posts.
Point 1, 2 should use the following technologies:
1. Ajax/jQuery
2. REST/API
3. JSON
These technologies listed above should be used in the implementation of the following features:
1. Logging in
2. Voting
For example, when the user votes (upvote or downvote), the client-side page should use Ajax to send
the vote to a REST API on the server and get back the new vote result. Similarly, the user should be
able to login via a form in the home page that uses Ajax and a REST API to update the page with the
result of logging-in (displaying the user’s username and insert a link to their profile page).
1. Use of Backbone.js in the implementation of the Logging-in and Voting features