使用CodeIgniter进行Ajax查询？

Question

I am currently developing a website and was using strictly PHP, after a few hours of development I am noticing I really need to perform AJAX queries. However I am using CI and slightly confused on how I call Ajax queries - especially to a controllers method. I am looking to post data using the query,I have found the following using Jquery:

$.ajax({
  type: "POST",
  url: url,
  data: data,
  success: success,
  dataType: dataType
});

but if I had a controller called main and method called postBack() - how would I pass postback() the data?

Could anyone point me in the right direction it would be much appreciated - apologies if this is extremely simple to say I am a newbie is an understatement.

Answer 1

Here is a Codeingiter/Jquery function pair that I wrote not long ago:

Javascript:

var BASE_URL = <?php echo base_url(); ?>
var stuff = "";

 $('div.get_this').each(function(){
    if(stuff ){
        stuff = stuff + '-';
    }
    stuff = stuff + $(this).html();
});

$.ajax({
  type: "POST",
  url: BASE_URL+"gate",
  data: {'data':stuff},
  success: function(data){
    ...
  });
});

Codeigniter Controller:

class Gate extends CI_Controller {

    public function index(){

        if(isset($_POST['data'])){

            $data = explode('-', $_POST['data']);