如何在codeigniter中将内容从ajax发布到控制器？

Question

I could not post my data to controller. I am using codeigniter framework. I need to perform autocomplete action with database. I could not send the typed or selected data from view to controller through ajax. Here is my ajax function:

var i=$('table tr').length;

$(".addmore").on('click',function(){
    count=$('table tr').length;

    var data="<tr><td><input type='checkbox' class='case'/></td><td><span id='snum"+i+"'>"+count+".</span></td>";
    data +="<td><input class='form-control' type='text' id='countryname_"+i+"' name='countryname[]'/></td> <td><input class='form-control' type='text' id='country_no_"+i+"' name='country_no[]'/></td><td><input class='form-control' type='text' id='phone_code_"+i+"' name='phone_code[]'/></td><td><input class='form-control' type='text' id='country_code_"+i+"' name='country_code[]'/></td></tr>";
    $('table').append(data);
    row = i ;
    $('#countryname_'+i).autocomplete({
    source: function( request, response ) {
        $.ajax({
            url : "<?php echo base_url(); ?>admin/billing/get_country",
            dataType: "json",
            method: 'post',
            data: {
               name_startsWith: request.term,
               type: 'country_table',
               row_num : row
            },
             success: function( data ) {
                 response( $.map( data, function( item ) {
                    var code = item.split("|");
                    return {
                        label: code[0],
                        value: code[0],
                        data : item
                    }
                }));
            }
        });
    },
    autoFocus: true,            
    minLength: 0,
    select: function( event, ui ) {
        var names = ui.item.data.split("|");
        id_arr = $(this).attr('id');
        id = id_arr.split("_");                 
        $('#country_no_'+id[1]).val(names[1]);
        $('#phone_code_'+id[1]).val(names[2]);
        $('#country_code_'+id[1]).val(names[3]);
    }               
  });

Answer 1

Change This

url : "<?php echo base_url(); ?>admin/billing/get_country",

To this,

 url     :   '<?php echo site_url('admin/billing/get_country');?>',