Cannot insert ajax data into database codeigniter - ajax

Question

I want to insert some ajax post data into database. But when I'm clicking submit, no data is being inserted.
view(header.php)
$(function(){
$(".submit").click(function(){
transaction_student_id=$(".student_id").val();
transaction_particular_name=$(".particular_name").val();
transaction_id=$(".transaction_id").val();
jQuery.ajax({
type: "POST",
url: "<?php echo base_url().'user/add_transaction'; ?>",
dataType: 'json',
data: {transaction_student_id: transaction_student_id,transaction_particular_name:transaction_particular_name,transaction_id:transaction_id},
success: function(data) {
}
});
});
});
Controller (User.php)
public function add_transaction()
{
$columns_and_fields = array('transaction_id','transaction_particular_name','transaction_student_id');
foreach ($columns_and_fields as $key)
$data[$key]=$this->input->post($key);
$query=$this->Mdl_data->insert_transaction($data);
if($query)
redirect('User','refresh');
}
Model (Mdl_data.php)
public function insert_transaction($data=array())
{
$tablename='transaction';
$query=$this->db->insert($tablename,$data);
return $query;
}

Answer 1

First of all, declare the variable in JavaScript with keyword var
var transaction_student_id=$(".student_id").val();
Before starting the Ajax use console.log() to know if the variables have data or not
The second thing is you are not getting the data with right way in the controller
Try like this
public function add_transaction()
{
$columns_and_fields = array('transaction_id' = $this->input->post('transaction_id'),
'transaction_particular_name' => $this->input->post('transaction_particular_name'),
'transaction_student_id' => $this->input->post('transaction_student_id'));
$query=$this->Mdl_data->insert_transaction($columns_and_fields);
if($query){
redirect('User','refresh');
}
}
Don't use the extra line of code without any reason
public function insert_transaction($data = array())
{
return $this->db->insert('transaction', $data);
}

Answer 2

Try debugging your code first.
Do you get all the data in controller? Try to dump POST values var_dump($_POST) in controller if ajax is successfully sending the data.
From there, you can see if the data in successfully sent from the front end.
jQuery.ajax({
type: "POST",
url: "<?php echo base_url(); ?>user/add_transaction",
dataType: 'json',
data: {
transaction_student_id: transaction_student_id,
transaction_particular_name: transaction_particular_name,
transaction_id: transaction_id
},
success: function( data ) {
console.log( data );
},
error: function( xhr, status ) {
/** Open developer tools and go to the Console tab */
console.log( xhr );
}
});

Answer 3

change it
$(function(){
$(".submit").click(function(){
transaction_student_id=$(".student_id").val();
transaction_particular_name=$(".particular_name").val();
transaction_id=$(".transaction_id").val();
jQuery.ajax({
type: "POST",
url: "<?php echo base_url().'user/add_transaction'; ?>",
dataType: 'json',
data: {transaction_student_id: transaction_student_id,transaction_particular_name:transaction_particular_name,transaction_id:transaction_id},
success: function(data) {
alert(data + ' id added' );
window.location.reload(); // force to reload page
}
});
});
});
at controller
public function add_transaction()
{ // use it only for ajax call or create another one
$columns_and_fields = array();
// 'transaction_id','transaction_particular_name','transaction_student_id'
foreach ($_POST as $key)
{
array_push($columns_and_fields , array(
'transaction_student_id' => $key['transaction_student_id'],
'transaction_particular_name'=>$key['transaction_particular_name'],
'transaction_id'=>$key['transaction_id']
)
);
}
$this->Mdl_data->insert_transaction_array($columns_and_fields);
}
and at model create new method
public function insert_transaction_array($data=array())
{
$tablename='transaction';
$this->db->insert_batch($tablename,$data);
}