Dependent dropdown values not updating to mysql - php

Question

In the below there are 2 dropdown course code and subject code .In my update part when i select course code it should populate corresponding subject code from course subject table and update to mysql. My problem is i got the dependent dropdown subject code but it is not updating the value to mysql.
Note:course code and subject code are from course subject table. course code is updating but subject code is not updating.
Controller:student_model
function subject_list()
{
$data = array();
$exam_name = $this->input->post('exam_name');
$course_name = $this->input->post('course_name');
if($query = $this->student_model->get_subject_records($exam_name,$course_name))
{
$data['all_coursesubject_records'] = $query;
}
$this->load->view('code_view', $data);
}
function manage_student()
{
$data['title']="Manage Student";
//query model to get data results for form
$data=array();
if($query=$this->student_model->get_student_records()){
$data['records']=$query;
}
$editstudent = $this->input->post('editstudent');
if( $this->input->post('editstudent') != false ){
foreach($editstudent as $row_id)
{
$this->form_validation->set_rules("register_number_" . $row_id, "register_number", "required|min_length[2]");
}
}
if ($this->form_validation->run() == FALSE){
$data["message"]="";
//$this->load->view("master_data/view_master_data_header",$data);
//$this->load->view("master_data/view_master_data_nav");
$this->load->view("student_detail_view",$data);
//$this->load->view("master_data/view_master_data_footer");
} else {
// single update - working
if( $this->input->post('editstudent') != false )
{
foreach ($editstudent as $row_id)
{
$data = array(
'register_number' => $this->input->post('register_number_'.$row_id),
'name' => $this->input->post('name_'.$row_id),
'course_code' => $this->input->post('course_code_id'.$row_id),
'subject_code' => $this->input->post('subject_code_id'.$row_id),
);
$this->student_model->update_student_records( $row_id, $data );
redirect('student_site','refresh');
}
$this->session->set_flashdata('dbaction', 'Selected Records have been updated successfully');
}
}
}
model :student_model
function get_subject_records($exam_name,$course_name)
{
//echo "exam_name inside get_subject_records".$exam_name;
//$this->db->select('course_code,subject_code');
//$this->db->where('exam_name',$exam_name);
$this->db->where('course_code',$course_name);
$query = $this->db->get('coursesubject');
return $query->result();
}
function get_subject_code_records()
{
$this->db->distinct();
$this->db->select('subject_code');
$query = $this->db->get('coursesubject');
return $query->result();
}
function update_student_records($row_id, $data)
{
$this->db->where('id',$row_id);
$this->db->update('student_table',$data);
}
view:subject_detail_view
<?php
$attributes=array(
'name'=>'updatecustomer',
'id'=>'updatecustomer'
);
echo form_open('student_site/manage_student',$attributes);
?>
<div id="validation_failed">
<?php
echo validation_errors();
?>
<?php $data = array();
if(isset($course_records)){
foreach ($course_records as $row)
{
$data[$row->course_code] = $row->course_code;
} }
?>
<div id="Processy ">
<table class="display table table-bordered table-striped" id='studenttable'>
<thead>
<tr font style='font-size:13px'>
<th> </th>
<th> </th>
<th>Course Code</th>
<th>Subject Code</th>
</tr></thead>
<?php if(isset($records)) : foreach($records as $row) : ?>
<tr >
<td >
<input type=checkbox name="editstudent[]" id="editstudent[]" value="<?php echo $row->id ?>">
</td>
<td >
//drop down course code
<?php
$js = 'class="dropdown_class" id="course_code_id'.$row->id.'" onChange=" get_subjectdetails112('.$row->id.')" ';
$js_name = 'course_code_id'.$row->id;
echo form_dropdown($js_name, $data, $row->course_code, $js);
?>
<input type="hidden" name="index" id="index" value="<?php echo $row->id; ?>"/>
</td>
<td>
<div id="subject_code_id<?php echo $row->id; ?>" ></div>
<input type="hidden" name="subject_code_id" id="subject_code_id" value="subject_code_id<?php echo $row->id; ?>"/>
</td></tr>
<?php endforeach; ?>
</table>
</div>
<input type="hidden" name="exam_name" id="exam_name" value="<?php echo $row->exam_name; ?>" />
<?php else : ?>
<?php endif; ?>
view: student_update
<script type="text/javascript" charset="utf-8">
function get_subjectdetails112(index) {
alert ("enter firstMAIN");
//var index = jQuery('#index').val();
//alert("index"+index);
var course_name = jQuery('#course_code_id'+index).val();
alert("course_name"+course_name);
//var exam_name = jQuery('#course_name_id>option:selected').text();
var exam_name = jQuery('#exam_name_id').val();
var subject_code = jQuery('#subject_code_id'+index).val();
alert(subject_code);
//var partsArray = exam_name.split('.');
//alert("ssubject_code"+ssubject_code);
//alert("course_name"+course_name);
//alert("exam_name"+exam_name);
jQuery.ajax({
data: 'exam_name='+exam_name+'&course_name=' + course_name,
type: 'POST',
url: 'student_site/subject_list ',
success: function(data){
//alert("inside change");
console.log(data);
//alert ("data"+data);
//for(var j = course_name; j < ssubject_code; j++)
//{
jQuery('#subject_code_id'+index).empty().append(data);
//}
}
});
}
</script>
view:code_view
<?php
if(isset($all_coursesubject_records)){
$subject_data = array();
foreach ($all_coursesubject_records as $row)
{
$subject_data[$row->subject_code] = $row->subject_code;
}
}
echo form_dropdown('subject_code_id', $subject_data,'class="dropdown_class" id="subject_code_id"');
?>

Answer 1

On your student_model (controller) file, try removing the comma here: 'subject_code' => $this->input->post('subject_code_id'.$row_id),
Change to:
$data = array('register_number' => $this->input->post('register_number_'.$row_id),
'name' => $this->input->post('name_'.$row_id),
'course_code' => $this->input->post('course_code_id'.$row_id),
'subject_code' => $this->input->post('subject_code_id'.$row_id));
Not sure though if that will have an effect.