Convert data to Json in CodeIgniter with AJAX - php

Question

I am struggling to convert json code in CodeIgniter, i wanna make pagination.
I am using ajax and want to controle data convert to json and send it to view. I can someone explain me how to do that.
Code in controler, instead foreach part i am trying to make Json, and send it to view
function ajax(){
$rpp= $_POST['rpp'];
$last = $_POST['last'];
$pn = $_POST['pn'];
if($pn<1){
$pn=1;
}
elseif($pn>$last){
$pn =$last;
}
$l = ($pn - 1) * $rpp;
$this->db->limit($l, $rpp);
$row = $this->db->get('pages');
$dataString='';
foreach($row->result() as $r){
$id = $r->id;
$info = $r->info;
$dataString .= $id.'|'.$info.'||';
}
echo json_encode($dataString);
}
}
view part
function request_page(pn)
{
var rpp = <?php echo $rpp; ?>; // results per page
var last = <?php echo $last; ?>; // last page number
var results_box = document.getElementById("results_box");
var pagination_controls = document.getElementById("pagination_controls");
results_box.innerHTML = "loading results ...";
$.ajax({
type: "POST",
url: "<?php echo site_url('search/ajax')?>",
data: { 'rpp' : rpp , 'last' : last, 'pn' : pn},
dataType: "text",
success: function(msg){
// alert(msg)
;
var dataArray = msg.split("||");
var html_output = "";
for(i = 0; i < dataArray.length - 1; i++){
var itemArray = dataArray[i].split("|");
html_output += "ID: "+itemArray[0]+" - Testimonial from <b>"+itemArray[1]+"</b><hr>";
}
results_box.innerHTML = html_output;
}
});
var paginationCtrls = "";
if(last != 1){
if (pn > 1) {
paginationCtrls += '<button onclick="request_page('+(pn-1)+')"><</button>';
}
paginationCtrls += ' <b>Page '+pn+' of '+last+'</b> ';
if (pn != last) {
paginationCtrls += '<button onclick="request_page('+(pn+1)+')">></button>';
}
}
pagination_controls.innerHTML = paginationCtrls;
}

Answer 1

its easy
you should have a view to encode the data to json. Its just this:
<?php
$this->output->set_header('Content-Type: application/json; charset=utf-8');
echo json_encode($json);
In the controller you just have to load this view with an array as parameter (i think that stdClass is also valid):
$data['json'] = array("foo" => "bar", "bar" => "foo");
$this->load->view('your_json_view', $data);