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I've search thru the web about CRUD in PHP jquery Ajax using modal form and i can say all the snippets i find is not accurate and helpful so i decided to share my own snippets to you guys.
In this tutorial we will be using Codeigniter Datatables, Jquery, Bootstrap, Xampp for local webserver and a little bit of commonsense.
First of all download all the components to complete this project. I supposed you guys have the knowledge how to get this component and make it run. Follow the link on the above components and you will be alright.
I will not be discussing here how to install and set up codeigniter. You can follow this detailed User Guide from codeIgniter.
Lets Start Coding.

File Structure:
Now go to your Htdocs folder and make a folder called assets. Inside this folder we will make 2 new folder and name it js and css. Here we will paste the bootstrap jquery and datatables components.
assets/js folder
assets/css folder
Creating Database:
Open your localhost phpmyadmin and create a database named project.
Code Igniter Database Settings:
I'll make it a little simpler lest skip the migration on CodeIgniter. Let's create a table from your database name project.
Table name: products

Column
prod_id = int, auto increment, primary key
prod_name{type: varchar, constraint:100}
prod_cost {type: decimal, constraint:65,2}
prod_stocks {type: INT}
prod_type {type:varchar, constraint:150}
prod_date_add {type: datetime , default: currenttimestamp}
Model Project_model.php
Controller MycrudProject.php
HTML Views Folder
Jquery assets/js/project.js
For more details download the Project file on this link Comment down below your questions and i'll be happy to answer. Happy coding.