Django + Ajax update listbox (View)

# -*- coding:utf-8 -*-
from django.http import HttpResponse, QueryDict
from django.shortcuts import render_to_response
from django.template import RequestContext

def xhr_test(request):
    if request.method == 'GET':
        message = "GET request"
        data = 'info from get of server'
        listbox = {'Hostname 1':'Value 1','Hostname 2':'Value 2','Hostname 3':'Value 3',}
    elif request.method == 'POST':
        message = "POST request"
        data = 'info from post of server'
        if request.POST.get('tipo') == 'hostname':
            listbox = {'Hostname 1':'Value 1','Hostname 2':'Value 2','Hostname 3':'Value 3',}
        else:
            listbox = {'Designação 1':'Valor 1','Designação 2':'Valor 2','Designação 3':'Valor 3',}
    else:
        message = "Hello"
        data = 'NADA'
    return render_to_response("ajax.html",
                                                 { 'message':message, 'data':data, 'listbox':listbox},
                                                 context_instance=RequestContext(request))