Laravel 5.5 send data to view without reloading page - php

Question

In my view I have some data that I can use $data in this $data are several other arrays with a key. Now my goal is to when a user selects something from a dropdown I want to update this $data array without doing a redirect.
I am aware I need to use AJAX and my AJAX call works fine I am just a tad confused on what I am supposed to do in my controller method I need to do something like this but without refreshing the page but this would remove all my other data that is already in the $data array from before
This is my method:
/**
* Fetches a company
*
* #param $companyId
*/
public function fetchCompany($companyId)
{
$company = Company::where('id', $companyId)->first();
$data['company'] = $company;
return view('this should be the same view that I did my ajax call from', ['data' => $data]);
}
So I want to add this $company to the already existing $data array that I am using in my view.

Answer 1

Answering from what I have understand so far.
public function fetchCompany($companyId)
{
$company = Company::where('id', $companyId)->first();
return response()->json($company);
}
then you need to call ajax like this
<script>
$(document).ready(function(){
$("whatever your dropdown id").change(function(){
$.ajax({
url:'yoururl',
type: 'whatever datatype',
dataType:'json',
success: function(data){
var x;
for(x in data){
$("#div1").append(data[x]);
}
}
});
});
});
</script>