Data check in database if already exist in codeigniter through ajax - php

Question

I want to check data in database through ajax in codeigniter how can get check name already exist through ajax
controller
public function insert(){
$user = array('Name' => $this->input->post('name'),
'Cnic' => $this->input->post('cnic'),
'Phone' => $this->input->post('phone'),
'Address' => $this->input->post('address'),
);
$this->load->model('suppliermodel');
if($this->suppliermodel->checkData($user['Name'])){
if ($this->session->userdata('user_id'))
$detail = 'Already exist';
$this->load->view('admin/includes/header');
$this->load->view('admin/includes/sidemenu');
$this->load->view('admin/add_supplier',['exist'=>$detail]);
$this->load->view('admin/includes/footer');
$this->load->view('admin/includes/add_supplier_footer');
}
else{
$this->suppliermodel->add($user);
}
}
model
public function checkData()
{
$name = $this->input->post('name');
$this->db->select('*');
$this->db->where('Name', $name);
$this->db->from('suppliers');
$query = $this->db->get();
if($query->num_rows() >0){
return $query->result();
}
else{
return $query->result();
return false;
}
}
what is ajax code and controller function

Answer 1

How about this?
Controller
public function insert(){
// set a rule that make the Name field is unique by 'set_rules'
$this->form_validation->set_rules('Name', 'Name Field', 'required|is_unique[suppliers.name]');
//$this->form_validation->set_rules('[Other Field]', '[Field Name to Display]', '[Restriction]');
// if the field cannot pass the rule
if ($this->form_validation->run() === FALSE) {
$errors = array();
foreach ($this->input->post() as $key => $value) {
// Add the error message for this field
$errors[$key] = strip_tags(form_error($key));
}
// Clear the empty fields (correct)
$response['errors'] = array_filter($errors);
$response['status'] = false;
}
else {
// otherwise, call the model
$result = $this->suppliermodel->add($user);
if ( $result ) {
$response['status'] = true;
}
}
echo json_encode($response);
}
JavaScript
$.ajax({
url: '//localhost/insert',
data: {
Name: $('input[name=Name]').val(),
Cnic: $('input[name=Cnic]').val(),
Phone: $('input[name=Phone]').val(),
Address: $('input[name=Address]').val()
},
dataType: 'JSON',
type: 'POST',
error: function(xhr) {
alert('request failed!');
},
success: function(response) {
var response = $.parseJSON(JSON.stringify(response));
if (response.status != true) {
$.each(response.errors, function(field, i) {
alert( field+ ' errors with ' + i)
});
}
else {
alert('success!');
}
}
});
Use is_unique[table.fieldToCompare] to make the field is always unique.
Wish it helps.
set_rules restrictions, see the Codeigniter User Guide Form validation
If fails, the controller would return a set of JSON, with field and error message. Then you can handle it in $.ajax's success.