PHP

laravel check request is ajax

         /**       
         * Display a listing of the resource.
         *
         * @param  IlluminateHttpRequest $request
         * @return Response
         */
        public function index(Request $request)
        {
            if($request->ajax()){
                return "AJAX";
            }
            return "HTTP";
        }

ajax get request in laravel

$(document).ready(function() {
    $('#country').change(function () {
        var country_id = this.value;
        $.ajax({
        url: '{{url('/')}}/admin/lottery_master/getstatesbycountry/'+country_id,
        dataType: 'json',
        type: 'GET',
            error: function() {
                toastr.error('Server error occured', Error, {
                    CloseButton: true,
                    ProgressBar: true
                });
            },
            success: function(data) {
                var sel = $("#state");
                var stateList = data.state;
                sel.empty();
                sel.append('<option value="">-- Select State --</option>');
                for (var i=0; i<stateList.length; i++) {
                    sel.append('<option value="' + stateList[i].id + '">' + stateList[i].state_name + '</option>');
                }
            },
		});
    });

}); 

check the ajax request in laravel

if($request->ajax()){
  return "ajax request";
}