Passing a value from Controller to jQuery CodeIgniter - php

Question

Straight to the case.
This is some functions from my model (Student Model):
public function get_exam_data($exam_id){
$this->db->select('exam_id, exam_name, duration');
$this->db->from('exams');
$this->db->where('exam_id', $exam_id);
$result = $this->db->get();
$exam = array();
$examrow = $result->row();
$exam['id'] = $examrow->exam_id;
$exam['name'] = $examrow->exam_name;
$exam['duration'] = $examrow->duration;
return $result;
}
public function start_exam($exam_id, $student_id)
{
$this->db->select('*');
$this->db->from('exam_record');
$exam_newstatus = array(
'student_id' => $student_id,
'exam_id' => $exam_id);
$this->db->set('start_time', 'NOW()', FALSE);
$this->db->insert('exam_record', $exam_newstatus);
//$examrecord_id is autoincrement in mysql exam_record table
$examrecord_id = $this->db->insert_id();
return $examrecord_id;
}
This is a function from the Student Controller:
public function get_student_exam_data()
{
$exam_id = $this->input->post('examId');
$examdata = $this->student_model->get_exam_data($exam_id);
$session = get_session_details();
if (isset($session->studentdetails) && !empty($session->studentdetails))
{
$loggeduser = (object)$session->studentdetails;
$examrecord_id = $this->student_model->start_exam($exam_id, $loggeduser->student_id);
}
echo json_encode($examdata);
}
This is how I access the $examdata value via Ajax:
jQuery(function()
{
$.ajax({
type : "POST",
url : "../get_exam_data/",
async : false,
data : {"examId": EXAM_ID },
success: function(response)
{
var data = $.parseJSON(response);
examId = data.id;
examName = data.name;
examDuration = data.duration;
}
});
}
I want to be able to pass $examrecord_id from the Student Controller to use it on my jQuery file, just like the $examdata.
I tried to use json_encode() twice on the Controller. Didn't work.
How do I pass $examrecord_id from the Controller to the jQuery file?
Can someone enlighten me, please? Thank you.

Answer 1

Add another index for your $examrecord_id
if (isset($session->studentdetails) && !empty($session->studentdetails))
{
$loggeduser = (object)$session->studentdetails;
$examrecord_id = $this->student_model->start_exam($exam_id, $loggeduser->student_id);
}
echo json_encode(array(
'examdata' => $examdata,
'examrecord_id' => (!empty($examrecord_id)?$examrecord_id:0)
));
Note the shorthand if condition to check if $examrecord_id is empty
Add a dataType option with 'json' as it's value. Then you can access the data
dataType : 'json',
success: function(response)
{
var data = response.examdata;
alert(response.examrecord_id); // your examrecord_id
examId = data.id;
examName = data.name;
examDuration = data.duration;
}