Store checkbox value in database

Question

I need your help... I have a custom checkbox, where the user clicks and is "ON" or "OFF" and this value must be saved in the database and must remain checked or unchecked indicated by the funitionnary because through this the admin will know whether the employee is ON (at work or not) or OFF. Turns out it does nothing, does nothing in the database and shows nothing in the browser console.

Follow the HTML code

<form id="checkboxs_data" method="POST" accept-charset="utf-8" >
    <input type="checkbox" style="display: none;" id="checkboxs">
    <input type="hidden" name="checkbox_offon" id="checkbox_offon" value="Off"  />
    <input type="hidden" name="nome_offon" value="<?php echo $row_func['nome'];?>" />
    <input type="hidden" name="id_offon" value="<?php echo $row_func['id'];?>" />


<button type="submit" name="actionhCeckbox" id="actionCheckbox" class="btn btn-primary">
    <span class="glyphicon glyphicon-floppy-saved"></span> 
</button></form>

Input is received by jQuery:

<script>
        $(document).ready(function() {
            $('#checkboxs').checkboxpicker({
                onLabel: 'On',
                offLabel: 'Off'
            });

            $('#checkboxs').change(function(){
                if($(this).is(':checked'))
                  {
                   $('#checkbox_offon').val('Off');
                  }
                else
                  {
                   $('#checkbox_offon').val('On');
                  }
            });

            $('#checkboxs_data').on('submit', function(e){

                e.preventDefault();
                var form_data = jQuery(this).serialize();


                jQuery.ajax({
                    url:"checkboxs.php",
                    method:"POST",
                    data:form_data,
                    success:function(html){
                        $('#checkboxs_data')[0].reset();
                        $('#checkboxs').checkboxpicker('On');
                       setTimeout(function(){ window.location.href = ""; }, 1000); 
                    }
                });
             });


        });
    </script>

And then in turn PHP receives the form and writes to the database

<?php 
   $panel_atual = "funcionario";  $data = date("d-m-Y H:s");

$id_offon = $_POST["id_offon"]; 
$nome_offon = $_POST["nome_offon"];
$checkbox_offon = $_POST["checkbox_offon"];

$connect = "UPDATE funcionarios SET offon = '$checkbox_offon' ,  data = 
'$data' WHERE id = '$id_offon'";
$query = mysqli_query($conexao, $connect) ;

if($query)
{
  echo "<script laguange='javascript'> window.alert('done');</script>";
}else{echo "<script laguange='javascript'> window.alert('error'); 
 </script>";}

?>

This is the checkbox button with bootstrap: