How to show network error in DATATABLE Ajax Call

Hi Everyone,

My server side script works fine, however when the server or network is down, i would like to show error message.

I am aware in my javascript, there is an issue with date field, where it not converting empty values, convert empty column to something meaningful but now it just showing Null.

ie., success or error

Here is my ajax call code?

`$(document).ready(function(){
            $('#empTable').DataTable({
                'processing': true,
                'serverSide': true,
                'serverMethod': 'post',
                'ajax': {
                    'url':'ajaxfile.php'
                },
                cache: false,
                'columns': [
                    { data: 'emp_no' },
                    { data: 'first_name' },
                    { data: 'last_name' },
                    { data: 'gender' },
                    { data: 'hire_date',
                    "render": function (data) {
        var dateObj = new Date(data);
        var month = ('0' + (dateObj.getMonth() + 1)).slice(-2);
        var date = ('0' + dateObj.getDate()).slice(-2);
        var year = dateObj.getFullYear();
        //var shortDate = year + '/' + month + '/' + date;
        return (date + '/' + month + '/' + year);
    } 


    },
                ],
                rowReorder: {
            dataSrc: 'id'
            }



            });
        });`

Any help is highly appreciated.