ApiController.php

class ApiController extends Controller
{
    /**
     * Section dependant dropdown system
     * This is for committee create
     *
     * @return \Illuminate\Http\Response
     */
    public function sectionDropDownData()
    {
        $member_type_id = \Input::get('member_type_id');

        if($member_type_id == 1 or $member_type_id == 2 ){
             $teacherList =\DB::table('role_user')
               ->where('role_id',2)
               ->lists('user_id');

           $users = User::where('dept_id', \Auth::user()->dept_id)->whereIn('id',$teacherList )->lists('name','id');
           return \Response::json($users);
        }else{
            $studentList =\DB::table('role_user')
                ->where('role_id',3)
                ->lists('user_id');

            $users = User::where('dept_id', \Auth::user()->dept_id)->whereIn('id',$studentList )->lists('name','id');
            return \Response::json($users);
        }


    }

route.php

//Api route
Route::get('api/section-dropdown', array('as' => 'apiroute', 'uses' => 'ApiController@sectionDropDownData'));

view.blade.php

   
   {!! Form::open(array('route' => 'student.search')) !!}

	<div class="form-group">
		{!! Form::label('class_id', 'Select Class :', array('class' => 'control-label')) !!}
		{!!Form::select('class_id', $class, '',array('class' => 'select2', 'autofocus','id'=>'class'))!!}


		{!! Form::label('section_id', 'Select Section :', array('class' => 'control-label')) !!}
		{!!Form::select('section_id', $section, '',array('class' => 'select2', 'autofocus', 'id'=>'section'))!!}

		{!! Form::submit('Search', array('class' => ' btn btn-primary')) !!}
	</div><br/>
	{!! Form::close() !!}
   
   
   
   <script type="text/javascript" charset="utf-8">
        //depandable dropdown start
        $('#type').on('change', function(e){

            var member_type_id = e.target.value;


            //ajax
            var path =  "<?php echo URL::route('apiroute'); ?>";
            $.get(path+'?member_type_id='+member_type_id, function(data){

                //success data
                $('#user').empty();
                $('#user').append('<option value=""> Please choose one</option>');


                $.each(data, function(key, value) {
                    var option = $("<option></option>")
                        .attr("value", key)
                        .text(value);

                    $('#user').append(option);
                });

            });
        });
        //depandable dropdown end

    </script>