AJAX call to CodeIgniter controller with parameter - php

Question

I know how AJAX call to CodeIgniter is working.
Edit for suggested answer
I tried redirection as a possible solution to my problem. I am not asking it as question. I am having problem passing parameter through URL and reusing view containing ajax post call. Also I am not aware how to post single value state_id which is already part of new_admission form.
I am loading city names for state_id of branch dynamically on $(document).ready()
When I call load_city() from admission() it works perfect.
XHR for load_city goes like:
localhost/project_folder/controller/load_city
But when I try edit_admission($studentId) it loads admission_view recursively inside <div id="city"></div>.
XHR for load_city goes like:
localhost/project_folder/controller/edit_admission/load_city
Here load_city is considered as parameter and edit_admission() is called recursively.
Controller:
public function load_city()
{
//load cities to $data from model
$this->load->view('city_view', $data);
}
public function admission()
{
//load init data for admission view from model
$this->load->view('admission_view', $data);
}
public function edit_admission($studentId)
{
//load init data for admission view from model
$this->load->view('admission_view', $data);
}
AJAX code:
function get_city() {
var parameters = {}; //instantiate the array
parameters['state_id'] = state_id;
$('#divcity').load('load_city', parameters, function (data) {
$('#city').combobox();
//code
});
};
load_city view:
<?php
echo '<select class="'.'form-control chzn-select col-lg-8 required'.'" id="'.'city'.'" name="'.'city'.'">';
echo '<option></option>';
foreach ($init_city['city_names'] as $row)
{
echo '<option value="'.$row->city_id.'">' .$row->city_name.'</option>';
}
echo '</select>';
?>
admission_view:
<div class="form-group">
<label class="control-label col-lg-4">City</label>
<div class="col-lg-8" id="divcity" name="divcity"></div>
</div>
I tried
public function edit_admission($studentId)
{
if(intval($studentId) > 0){
//load init data for admission view from model
$this->load->view('admission_view', $data);
} else if($studentId == 'load_city'){
//not passing post data to load_city()
redirect('branch/load_city');
}
}
Above code is not passing post data to load_city().
Also, I tried adding bellow code in routes.php
$route['edit_admission/load_city'] = 'load_city';
I did not get any success in both cases.