If you know how to send jQuery AJAX request in Core PHP then it is simpler for you to do it in CodeIgniter.
In CodeIgniter, you can use the controller and model to handle AJAX call instead of creating a separate file. Make AJAX call either from the view or external script file.
In this tutorial, I am creating a simple example to demonstrate the AJAX calling in CodeIgniter 3.
The autocomplete functionality shows the suggestion list according to the entered value. You can choose a suggestion from the list. With jQuery UI you can easily add autocomplete widget to the input element. You can use your mouse or keyboard arrow keys to navigate the suggestion list. The widget has various options for customization.
You can set the suggestion source value while initializing the widget. This means it will search for values within the given source value whenever the user types any character. Alternatively, you can make it dynamic with AJAX.
In this tutorial, I show how you can add jQuery UI autocomplete on the textbox and select single or multiple values from the suggestion list.
All logical operation and database handling done in the Models like insert, update or fetch records.
Codeigniter has predefined Database methods to perform database request.
In the demonstration, with View show the HTML form and when the user submits the forms then call the Model method to insert record from the controller.
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