Getting data by ajax in Codeigniter - ajax

Question

I am adding record to database by ajax in CI , so i was trying to return the id of the new record but it's not working , the record has been added but no id is returned .(in ajax code am trying to alert the new record id but it's alerting undefined)
Below is the ajax code:
$.ajax({
type:'post',
url: baseURL+"admin/Products/add_product",
data:postData,
success:function(data){
alert(data[0].id);
$('#register_form')[0].reset();
} });
This is the controller,
notice that am returning id from create_product method and put it in get_by_id method, and then return result
if($id=$this->Products_model->create_product($data)){
$result = $this->Products_model->get_product_by_id($id);
return $result;
}
This is my model methods
public function create_product($data){
$query = $this->db->insert('products',$data);
if($query){
$id = $this->db->insert_id();
return $id;
}else{
return false;
}
}
//////////get_by_id_method
public function get_product_by_id($id){
$this->db->where($id,'id');
$query = $this->db->get('products');
if($query){
return $query->result();
}
}

Answer 1

Hope this will help You :
Your ajax should be like this :
$.ajax({
type:'post',
url: baseURL + "admin/Products/add_product",
data:postData,
success:function(data)
{
var response = JSON.parse(data);
alert(response.id);
$('#register_form')[0].reset();
}
});
Your controller should be like this :
$id = $this->Products_model->create_product($data);
if($id)
{
$result = $this->Products_model->get_product_by_id($id);
echo json_encode($result);
exit;
}
Your model method get_product_by_id should be like this :
public function get_product_by_id($id)
{
$this->db->where($id,'id');
$query = $this->db->get('products');
if($query->num_rows() > 0)
{
return $query->row();
}
}

Answer 2

You may need to echo a JSON with a proper Content-type in your Controller:
$result = [];
$id = $this->Products_model->create_product($data);
if ($id) {
$result = $this->Products_model->get_product_by_id($id);
}
header("Content-type: application/json");
echo json_encode($result);
So that the response can be an empty object or the query result.