Codeigniter 4 CRUD Operation With Ajax Example

In this article, We will inform you how to perform crud operation with ajax in CodeIgniter 4(Codeigniter 4 CRUD Operation With Ajax Example).

CRUD stands for create, read, update, and delete. if you create a user-friendly website at that time need to crud operation.

if you want to create CRUD operation with ajax in CodeIgniter 4, then the first configuration of the database and connect the MySQL database then after creating CRUD operation with ajax in Codeigniter 4.

in our post through, We will go how to connect CodeIgniter 4 to MySQL and perform the CRUD operation.

if you want to create CRUD operation in CodeIgniter 4, so you can follow the below steps.
Overview
Step 1: Download Codeigniter
Step 2: Basic Configurations
Step 3: Create a Database in table
Step 4: Connect to Database
Step 5: Create Controller and Model
Step 6: Create Views Files
Step 7: Run The Application

Step 1: Download Codeigniter
If you want to download or install CodeIgniter 4 then you can below Url.
How To Install Codeigniter 4 Using Manual, Composer, Git

Step 2: Basic Configurations
If you want to Basic Configurations in your project then you can below Url.
Codeigniter 4 Removing Index.Php From Url

Step 3: Create a Database in table
In this step, We will create the database and table.

CREATE TABLE IF NOT EXISTS `students` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `first_name` varchar(64) NOT NULL,
  `last_name` varchar(64) NOT NULL,
  `address` text NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB  DEFAULT CHARSET=latin1 AUTO_INCREMENT=15 ;

CREATE TABLE IF NOT EXISTS `students` (

`id` int(11) NOT NULL AUTO_INCREMENT,

`first_name` varchar(64) NOT NULL,

`last_name` varchar(64) NOT NULL,

`address` text NOT NULL,

PRIMARY KEY (`id`)

) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=15 ;

Step 4: Connect to Database
Go to the “app/Config/Database.php” folder and open database.php file some changes in this file like hostname, database username, database password, and database name.

	public $default = [
		'DSN'      => '',
		'hostname' => 'localhost',
		'username' => 'root',
		'password' => '',
		'database' => 'codeigniter4_crud',
		'DBDriver' => 'MySQLi',
		'DBPrefix' => '',
		'pConnect' => false,
		'DBDebug'  => (ENVIRONMENT !== 'production'),
		'cacheOn'  => false,
		'cacheDir' => '',
		'charset'  => 'utf8',
		'DBCollat' => 'utf8_general_ci',
		'swapPre'  => '',
		'encrypt'  => false,
		'compress' => false,
		'strictOn' => false,
		'failover' => [],
		'port'     => 3306,
	];

public $default = [

'DSN' => '',

'hostname' => 'localhost',

'username' => 'root',

'password' => '',

'database' => 'codeigniter4_crud',

'DBDriver' => 'MySQLi',

'DBPrefix' => '',

'pConnect' => false,

'DBDebug' => (ENVIRONMENT !== 'production'),

'cacheOn' => false,

'cacheDir' => '',

'charset' => 'utf8',

'DBCollat' => 'utf8_general_ci',

'swapPre' => '',

'encrypt' => false,

'compress' => false,

'strictOn' => false,

'failover' => [],

'port' => 3306,

];

Step 5: Create Controller and Model
In this step, we will a create “Student.php” controller and “StudentModel.php” model.
app/Controllers/Student.php

<?php namespace App\Controllers;
 
use CodeIgniter\Controller;
use App\Models\StudentModel;
 
class Student extends Controller
{
 
    public function index()
    {    
        $model = new StudentModel();
 
        $data['students_detail'] = $model->orderBy('id', 'DESC')->findAll();
        
        return view('list', $data);
    }    

 
    public function store()
    {  
        helper(['form', 'url']);
         
        $model = new StudentModel();
		
        $data = [
            'first_name' => $this->request->getVar('txtFirstName'),
            'last_name'  => $this->request->getVar('txtLastName'),
            'address'  => $this->request->getVar('txtAddress'),
            ];
        $save = $model->insert_data($data);
		if($save != false)
		{
			$data = $model->where('id', $save)->first();
			echo json_encode(array("status" => true , 'data' => $data));
		}
		else{
			echo json_encode(array("status" => false , 'data' => $data));
		}
    }
 
    public function edit($id = null)
    {
      
     $model = new StudentModel();
	
     $data = $model->where('id', $id)->first();
	 
    if($data){
			echo json_encode(array("status" => true , 'data' => $data));
		}else{
			echo json_encode(array("status" => false));
		}
    }
 
    public function update()
    {  
 
		helper(['form', 'url']);
		 
		$model = new StudentModel();

		$id = $this->request->getVar('hdnStudentId');

		 $data = [
			'first_name' => $this->request->getVar('txtFirstName'),
			'last_name'  => $this->request->getVar('txtLastName'),
			'address'  => $this->request->getVar('txtAddress'),
			];

		$update = $model->update($id,$data);
		if($update != false)
		{
			$data = $model->where('id', $id)->first();
			echo json_encode(array("status" => true , 'data' => $data));
		}
		else{
			echo json_encode(array("status" => false , 'data' => $data));
		}
    }
 
    public function delete($id = null){
		$model = new StudentModel();
		$delete = $model->where('id', $id)->delete();
		if($delete)
		{
		   echo json_encode(array("status" => true));
		}else{
		   echo json_encode(array("status" => false));
		}
    }
}

?>

<?php namespace App\Controllers;

use CodeIgniter\Controller;

use App\Models\StudentModel;

class Student extends Controller

{

public function index()

{

$model = new StudentModel();

$data['students_detail'] = $model->orderBy('id', 'DESC')->findAll();

return view('list', $data);

}

public function store()

{

helper(['form', 'url']);

$model = new StudentModel();

$data = [

'first_name' => $this->request->getVar('txtFirstName'),

'last_name' => $this->request->getVar('txtLastName'),

'address' => $this->request->getVar('txtAddress'),

];

$save = $model->insert_data($data);

if($save != false)

{

$data = $model->where('id', $save)->first();

echo json_encode(array("status" => true , 'data' => $data));

}

else{

echo json_encode(array("status" => false , 'data' => $data));

}

public function edit($id = null)

{

$model = new StudentModel();

$data = $model->where('id', $id)->first();

if($data){

echo json_encode(array("status" => true , 'data' => $data));

}else{

echo json_encode(array("status" => false));

}

public function update()

{

helper(['form', 'url']);

$model = new StudentModel();

$id = $this->request->getVar('hdnStudentId');

$data = [

'first_name' => $this->request->getVar('txtFirstName'),

'last_name' => $this->request->getVar('txtLastName'),

'address' => $this->request->getVar('txtAddress'),

];

$update = $model->update($id,$data);

if($update != false)

{

$data = $model->where('id', $id)->first();

echo json_encode(array("status" => true , 'data' => $data));

}

else{

echo json_encode(array("status" => false , 'data' => $data));

}

public function delete($id = null){

$model = new StudentModel();

$delete = $model->where('id', $id)->delete();

if($delete)

{

echo json_encode(array("status" => true));

}else{

echo json_encode(array("status" => false));

}

app/Models/StudentModel.php

<?php namespace App\Models;
use CodeIgniter\Database\ConnectionInterface;
use CodeIgniter\Model;
 
class StudentModel extends Model
{
    protected $table = 'Students';
 
    protected $allowedFields = ['first_name','last_name','address'];
	
	public function __construct() {
        parent::__construct();
        //$this->load->database();
        $db = \Config\Database::connect();
        $builder = $db->table('Students');
    }
	
	public function insert_data($data) {
		if($this->db->table($this->table)->insert($data))
        {
            return $this->db->insertID();
        }
        else
        {
            return false;
        }
    }
}
?>

<?php namespace App\Models;

use CodeIgniter\Database\ConnectionInterface;

use CodeIgniter\Model;

class StudentModel extends Model

{

protected $table = 'Students';

protected $allowedFields = ['first_name','last_name','address'];

public function __construct() {

parent::__construct();

//$this->load->database();

$db = \Config\Database::connect();

$builder = $db->table('Students');

}

public function insert_data($data) {

if($this->db->table($this->table)->insert($data))

{

return $this->db->insertID();

}

else

{

return false;

}

Step 6: Create Views Files
Finally, we will create the list.php, add.php, and edit.php in the app/views directory.
app/views/list.php

<!DOCTYPE html>
<html lang="en">
<head>
    <title>Codeigniter 4 CRUD Operation With Ajax Example</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.0/css/bootstrap.min.css">
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.0/js/bootstrap.min.js"></script>
	<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-validate/1.19.0/jquery.validate.js"></script>
</head>
<body>
<div class="container">
    <div class="row">
        <div class="col-lg-11">
            <h2>Codeigniter 4 Ajax CRUD Example</h2>
        </div>
        <div class="col-lg-1">
            <a class="btn btn-success" href="#" data-toggle="modal" data-target="#addModal">Add</a>
        </div>
    </div>

    <table class="table table-bordered" id="studentTable">
		<thead>
			<tr>
				<th>id</th>
				<th>First Name</th>
				<th>Last Name</th>
				<th>Address</th>
				<th width="280px">Action</th>
			</tr>
		</thead>	
		<tbody>
       <?php
		foreach($students_detail as $row){
		?>
		<tr id="<?php echo $row['id']; ?>">
			<td><?php echo $row['id']; ?></td>
			<td><?php echo $row['first_name']; ?></td>
			<td><?php echo $row['last_name']; ?></td>
			<td><?php echo $row['address']; ?></td>
			<td>
			<a data-id="<?php echo $row['id']; ?>" class="btn btn-primary btnEdit">Edit</a>
			<a data-id="<?php echo $row['id']; ?>" class="btn btn-danger btnDelete">Delete</a>
			</td>
		</tr>
	<?php
}
?>
	</tbody>
</table>
		<!-- Add Student Modal -->
		<div id="addModal" class="modal fade" role="dialog">
		  <div class="modal-dialog">
		 
			<!-- User Student content-->
			<div class="modal-content">
			  <div class="modal-header">
				<button type="button" class="close" data-dismiss="modal">&times;</button>
				<h4 class="modal-title">Add New Student</h4>
			  </div>
			  <div class="modal-body">
				<form id="addStudent" name="addStudent" action="<?php echo site_url('student/store');?>" method="post">
					<div class="form-group">
						<label for="txtFirstName">First Name:</label>
						<input type="text" class="form-control" id="txtFirstName" placeholder="Enter First Name" name="txtFirstName">
					</div>
					<div class="form-group">
						<label for="txtLastName">Last Name:</label>
						<input type="text" class="form-control" id="txtLastName" placeholder="Enter Last Name" name="txtLastName">
					</div>
					<div class="form-group">
						<label for="txtAddress">Address:</label>
						<textarea class="form-control" id="txtAddress" name="txtAddress" rows="10" placeholder="Enter Address"></textarea>
					</div>
					<button type="submit" class="btn btn-primary">Submit</button>
				</form>
			  </div>
			  <div class="modal-footer">
				<button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
			  </div>
			</div>
		  </div>
		</div>	
		<!-- Update User Modal -->
		<div id="updateModal" class="modal fade" role="dialog">
		  <div class="modal-dialog">
		 
			<!-- User Modal content-->
			<div class="modal-content">
			  <div class="modal-header">
				<button type="button" class="close" data-dismiss="modal">&times;</button>
				<h4 class="modal-title">Update Student</h4>
			  </div>
			  <div class="modal-body">
				<form id="updateStudent" name="updateStudent" action="<?php echo site_url('student/update');?>" method="post">
					<input type="hidden" name="hdnStudentId" id="hdnStudentId"/>
					<div class="form-group">
						<label for="txtFirstName">First Name:</label>
						<input type="text" class="form-control" id="txtFirstName" placeholder="Enter First Name" name="txtFirstName">
					</div>
					<div class="form-group">
						<label for="txtLastName">Last Name:</label>
						<input type="text" class="form-control" id="txtLastName" placeholder="Enter Last Name" name="txtLastName">
					</div>
					<div class="form-group">
						<label for="txtAddress">Address:</label>
						<textarea class="form-control" id="txtAddress" name="txtAddress" rows="10" placeholder="Enter Address"></textarea>
					</div>
					<button type="submit" class="btn btn-primary">Submit</button>
				</form>
			  </div>
			  <div class="modal-footer">
				<button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
			  </div>
			</div>
		  </div>
		</div>	 
		<script>
		  $(document).ready(function () {
			//Add the Student  
			$("#addStudent").validate({
				 rules: {
						txtFirstName: "required",
						txtLastName: "required",
						txtAddress: "required"
					},
					messages: {
					},
<div style="clear:both; margin-top:0em; margin-bottom:1em;"><a href="https://xpertphp.com/how-to-use-hooks-in-codeigniter/" target="_blank" rel="nofollow" class="u920f42ad22c9b0c26d963dddb92e1616"><style>.u920f42ad22c9b0c26d963dddb92e1616{padding:0;margin:0;padding-top:1em!important;padding-bottom:1em!important;width:100%;display:block;font-weight:700;background-color:#eaeaea;border:0!important;border-left:4px solid #34495E!important;box-shadow:0 1px 2px rgba(0,0,0,.17);-moz-box-shadow:0 1px 2px rgba(0,0,0,.17);-o-box-shadow:0 1px 2px rgba(0,0,0,.17);-webkit-box-shadow:0 1px 2px rgba(0,0,0,.17);text-decoration:none}.u920f42ad22c9b0c26d963dddb92e1616:active,.u920f42ad22c9b0c26d963dddb92e1616:hover{opacity:1;transition:opacity 250ms;webkit-transition:opacity 250ms;text-decoration:none}.u920f42ad22c9b0c26d963dddb92e1616{transition:background-color 250ms;webkit-transition:background-color 250ms;opacity:1.11;transition:opacity 250ms;webkit-transition:opacity 250ms}.u920f42ad22c9b0c26d963dddb92e1616 .ctaText{font-weight:700;color:#464646;text-decoration:none;font-size:16px}.u920f42ad22c9b0c26d963dddb92e1616 .postTitle{color:#000;text-decoration:underline!important;font-size:16px}.u920f42ad22c9b0c26d963dddb92e1616:hover .postTitle{text-decoration:underline!important}</style><div style="padding-left:1em; padding-right:1em;"><span class="ctaText">See also</span>  <span class="postTitle">How to use Hooks in Codeigniter</span></div></a></div>		 
				 submitHandler: function(form) {
				  var form_action = $("#addStudent").attr("action");
				  $.ajax({
					  data: $('#addStudent').serialize(),
					  url: form_action,
					  type: "POST",
					  dataType: 'json',
					  success: function (res) {
						  var student = '<tr id="'+res.data.id+'">';
						  student += '<td>' + res.data.id + '</td>';
						  student += '<td>' + res.data.first_name + '</td>';
						  student += '<td>' + res.data.last_name + '</td>';
						  student += '<td>' + res.data.address + '</td>';
						  student += '<td><a data-id="' + res.data.id + '" class="btn btn-primary btnEdit">Edit</a>&nbsp;&nbsp;<a data-id="' + res.data.id + '" class="btn btn-danger btnDelete">Delete</a></td>';
						  student += '</tr>';            
						  $('#studentTable tbody').prepend(student);
						  $('#addStudent')[0].reset();
						  $('#addModal').modal('hide');
					  },
					  error: function (data) {
					  }
				  });
				}
			});
		  
		 
			//When click edit Student
			$('body').on('click', '.btnEdit', function () {
			  var student_id = $(this).attr('data-id');
			   $.ajax({
					  url: 'student/edit/'+student_id,
					  type: "GET",
					  dataType: 'json',
					  success: function (res) {
						  $('#updateModal').modal('show');
						  $('#updateStudent #hdnStudentId').val(res.data.id); 
						  $('#updateStudent #txtFirstName').val(res.data.first_name);
						  $('#updateStudent #txtLastName').val(res.data.last_name);
						  $('#updateStudent #txtAddress').val(res.data.address);
					  },
					  error: function (data) {
					  }
				});
		   });
			// Update the Student
			$("#updateStudent").validate({
				 rules: {
						txtFirstName: "required",
						txtLastName: "required",
						txtAddress: "required"
					},
					messages: {
					},
				 submitHandler: function(form) {
				  var form_action = $("#updateStudent").attr("action");
				  $.ajax({
					  data: $('#updateStudent').serialize(),
					  url: form_action,
					  type: "POST",
					  dataType: 'json',
					  success: function (res) {
						  var student = '<td>' + res.data.id + '</td>';
						  student += '<td>' + res.data.first_name + '</td>';
						  student += '<td>' + res.data.last_name + '</td>';
						  student += '<td>' + res.data.address + '</td>';
						  student += '<td><a data-id="' + res.data.id + '" class="btn btn-primary btnEdit">Edit</a>&nbsp;&nbsp;<a data-id="' + res.data.id + '" class="btn btn-danger btnDelete">Delete</a></td>';
						  $('#studentTable tbody #'+ res.data.id).html(student);
						  $('#updateStudent')[0].reset();
						  $('#updateModal').modal('hide');
					  },
					  error: function (data) {
					  }
				  });
				}
			});		
				
		   //delete student
			$('body').on('click', '.btnDelete', function () {
			  var student_id = $(this).attr('data-id');
			  $.get('student/delete/'+student_id, function (data) {
				  $('#studentTable tbody #'+ student_id).remove();
			  })
		   });	
			
		});	  
	</script>
</div>
</body>
</html>

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<!DOCTYPE html>

<head>

<title>Codeigniter 4 CRUD Operation With Ajax Example</title>

</head>

<body>

<h2>Codeigniter 4 Ajax CRUD Example</h2>

</div>

</div>

<thead>

<tr>

<th>First Name</th>

<th>Address</th>

<th width="280px">Action</th>

</tr>

</thead>

<tbody>

<?php

foreach($students_detail as $row){

<td>

<a data-id="<?php echo $row['id']; ?>" class="btn btn-primary btnEdit">Edit</a>

<a data-id="<?php echo $row['id']; ?>" class="btn btn-danger btnDelete">Delete</a>

</td>

</tr>

<?php

}

</tbody>

</table>

<h4 class="modal-title">Add New Student</h4>

</div>

<form id="addStudent" name="addStudent" action="<?php echo site_url('student/store');?>" method="post">

<label for="txtFirstName">First Name:</label>

</div>

</div>

<label for="txtAddress">Address:</label>

</div>

<button type="submit" class="btn btn-primary">Submit</button>

</form>

</div>

<button type="button" class="btn btn-default" data-dismiss="modal">Close</button>

</div>

<h4 class="modal-title">Update Student</h4>

</div>

<form id="updateStudent" name="updateStudent" action="<?php echo site_url('student/update');?>" method="post">

<label for="txtFirstName">First Name:</label>

</div>

</div>

<label for="txtAddress">Address:</label>

</div>

<button type="submit" class="btn btn-primary">Submit</button>

</form>

</div>

<button type="button" class="btn btn-default" data-dismiss="modal">Close</button>

</div>

$(document).ready(function () {

//Add the Student

$("#addStudent").validate({

rules: {

txtFirstName: "required",

txtLastName: "required",

txtAddress: "required"

messages: {

submitHandler: function(form) {

var form_action = $("#addStudent").attr("action");

$.ajax({

data: $('#addStudent').serialize(),

url: form_action,

type: "POST",

dataType: 'json',

success: function (res) {

var student = '<tr id="'+res.data.id+'">';

student += '<td>' + res.data.id + '</td>';

student += '<td>' + res.data.first_name + '</td>';

student += '<td>' + res.data.last_name + '</td>';

student += '<td>' + res.data.address + '</td>';

student += '<td><a data-id="' + res.data.id + '" class="btn btn-primary btnEdit">Edit</a>  <a data-id="' + res.data.id + '" class="btn btn-danger btnDelete">Delete</a></td>';

student += '</tr>';

$('#studentTable tbody').prepend(student);

$('#addStudent')[0].reset();

$('#addModal').modal('hide');

error: function (data) {

}

});

}

});

//When click edit Student

$('body').on('click', '.btnEdit', function () {

var student_id = $(this).attr('data-id');

$.ajax({

url: 'student/edit/'+student_id,

type: "GET",

dataType: 'json',

success: function (res) {

$('#updateModal').modal('show');

$('#updateStudent #hdnStudentId').val(res.data.id);

$('#updateStudent #txtFirstName').val(res.data.first_name);

$('#updateStudent #txtLastName').val(res.data.last_name);

$('#updateStudent #txtAddress').val(res.data.address);

error: function (data) {

}

});

// Update the Student

$("#updateStudent").validate({

rules: {

txtFirstName: "required",

txtLastName: "required",

txtAddress: "required"

messages: {

submitHandler: function(form) {

var form_action = $("#updateStudent").attr("action");

$.ajax({

data: $('#updateStudent').serialize(),

url: form_action,

type: "POST",

dataType: 'json',

success: function (res) {

var student = '<td>' + res.data.id + '</td>';

student += '<td>' + res.data.first_name + '</td>';

student += '<td>' + res.data.last_name + '</td>';

student += '<td>' + res.data.address + '</td>';

student += '<td><a data-id="' + res.data.id + '" class="btn btn-primary btnEdit">Edit</a>  <a data-id="' + res.data.id + '" class="btn btn-danger btnDelete">Delete</a></td>';

$('#studentTable tbody #'+ res.data.id).html(student);

$('#updateStudent')[0].reset();

$('#updateModal').modal('hide');

error: function (data) {

}

});

}

});

//delete student

$('body').on('click', '.btnDelete', function () {

var student_id = $(this).attr('data-id');

$.get('student/delete/'+student_id, function (data) {

$('#studentTable tbody #'+ student_id).remove();

})

});

</script>

</div>

</body>

</html>

Step 7: Run The Application
Now we will run our example using the below Url in the browser.

http://localhost/codeigniter4_ajax_crud/student

1	http://localhost/codeigniter4_ajax_crud/student

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