500 Internal Server Error in Ajax call (Laravel) - php

Question

I am trying to get dependant select items using ajax call. After selecting 'class' it should show the related 'groups'. But, I am getting 500 internal server error on my console. Would someone help me please to get the expected result?
admission-form.blade.php -
<form action="{{ route('admin.students.admission') }}" method="POST" enctype="multipart/form-data">
{{ csrf_field() }}
<div class="row">
<div class="col-sm-6">
<div class="form-group {{ $errors->has('first_admission_class') ? 'has-error' : '' }}">
<select class="form-control" name="first_admission_class" id="first_admission_class">
<option value="">Select Class</option>
#foreach($classes as $class)
<option value="{{ $class->id }}" {{ (old("first_admission_class") == $class->id ? "selected":"") }}>{{ $class->class_name }}</option>
#endforeach
</select>
</div>
</div>
<div class="col-sm-6">
<div class="form-group {{ $errors->has('first_admission_class_group') ? 'has-error' : '' }}">
<select class="form-control" name="first_admission_class_group">
</select>
</div>
</div>
</div>
</form>
Script for Ajax call:
<script>
$('#first_admission_class').on('change', function(e){
console.log(e);
var class_id = e.target.value;
$.get('http://localhost/school/public/admin/ajax-group/' + class_id, function(data){
console.log(data);
});
});
</script>
web.php -
Route::group(['prefix' => 'admin', 'as' => 'admin.', 'middleware' => 'auth:admin'], function () {
Route::get('ajax-group/{id}', function(){
$class_id = Input::get('class_id');
$groups = AvailableclassGroup::where('availableclass_id', '=', $class_id)->get();
return Response::json($groups);
});
});

Answer 1

your route is look like this, when we add param in route they accessible via function param. i hope it works for you.
Route::get('ajax-group/{id}', function($id){
$groups = AvailableclassGroup::where('availableclass_id', '=', $id)->get();
return Response::json($groups);
});
});
you can check laravel doc Laravel route doc
if still it didnot work then
add csrf token, like this in head of your html layout
<meta name="csrf-token" content="{{ csrf_token() }}">
and make your ajax call like this
$.ajaxSetup({
headers: {
'X-CSRF-TOKEN': $('meta[name="csrf-token"]').attr('content')
}
})
$.ajax({
type: 'get',
url: '/ajax-group/'+ class_id,
dataType: 'json',
success: function (data) {
},
error: function (data) {
console.log('Error:', data);
}
});

Answer 2

Your wildcard its named id and you are getting as class_id so change :
And make sure your route its named as admin.students.admission
Route::get('ajax-group/{id}', function(){
$class_id = Input::get('id');
$groups = AvailableclassGroup::where('availableclass_id', '=', $class_id)->get();
return Response::json($groups);
});
})->name('admin.students.admission');
And make sure you have imported the classes on route file.

Answer 3

as I saw, you're not sending data, so you can't say $class_id = Input::get('id');. You have id parameter in your url, just use it.
Route::get('ajax-group/{id}', function($class_id){
$groups = AvailableclassGroup::where('availableclass_id', '=', $class_id)->get();
return Response::json($groups);
});