Doing live search in codeigniter via ajax , mongodb - ajax

Question

This is my ajax code which fetches all data from data and display in the table, but when I input an alphabet in search-box, it again fetches complete data inside the table
<script>
$(document).ready(function(){
load_data();
function load_data(query)
{
var xhttp = new XMLHttpRequest();
xhttp.open("GET", "<?php echo base_url() ?>Appconfig/get_masteradmin_data?query="+query,true);
xhttp.onload= function()
{
if (xhttp.status >=200 && xhttp.status <400)
{
var data= JSON.parse(xhttp.responseText);
var html = '';
var i;
for(i=0; i<data.length; i++){
html +='<tr>'+
'<td>'+data[i].full_name+'</td>'+
'<td>'+data[i].username+'</td>'+
'<td>'+data[i].designation+'</td>'+
'<td>'+data[i].department+'</td>'+
'<td>'+data[i].official_mobile_no+'</td>'+
'<td>'+data[i].official_email_id+'</td>'+
'<td>'+data[i].select_user_type+'</td>'+
'<td>'+data[i].permission+'</td>'+
'</tr>';
}
showdata.insertAdjacentHTML('beforeend',html);
}
else
{
console.log("Try again after some time");
}
};
xhttp.send();
}
$('#search').keyup(function(){
var search = $(this).val();
//console.log(search);
if(search != '')
{
load_data(search);
}
else
{
load_data();
}
});
});
</script>
This is my model for fetching data from my mongodb collection.
public function get_masteradmin_data($query)
{
$mongo = new \MongoDB\Driver\Manager('mongodb://localhost:27017');
$query= '';
//$filter = ['full_name' => 'www'];
$regex = new MongoDB\BSON\Regex ($query);
$filter = ['full_name'=>$regex,];
$options =[
'projection' => [
'_id' => 0,
'full_name' => 1,
'username' => 1,
'designation'=> 1,
'department'=> 1,
'official_mobile_no'=> 1,
'official_email_id'=> 1,
'select_user_type'=> 1,
'permission'=> 1,
],
'sort' => [
'_id' => -1
],
];
$query = new MongoDB\Driver\Query($filter, $options);
//$readPreference = new MongoDB\Driver\ReadPreference(MongoDB\Driver\ReadPreference::RP_PRIMARY);
$result = $mongo->executeQuery('justrack_db.master_admin', $query);
$res = array();
foreach($result as $r)
{
$res[] = $r;
}
return json_encode($res,true);
//return $res;
}
This is my controller for displaying data. I am not sure, but I think there is some issue in my controller, as I tried to echo $query but it shows nothing. I am not able to understand how to fix this.
public function get_masteradmin_data()
{
$query = '';
$this->load->model('AppconfigModel');
$this->master_admin();
if($this->input->post('query'))
{
$query = $this->input->post('query');
}
$result= $this->AppconfigModel->get_masteradmin_data($query);
echo ($result);
}