how do i write this django view('jsonview'),it is used $.getJSON(jquery)

Question

$.getJSON('/jsonView', {
                                tag: "userName",
                                userName: 'zjm1126'
                            },
                            function (H) {
                                if (H.result == "successName") {
                                    F.showOk(h.ok);
                                } else {
                                    if (H.result == "existName") {
                                        F.showErr(h.userNameExist);
                                    }
                                }
                            })

the view:

def jsonView(request):
    #i don't know,can you.

Answer 1

I suggest you work your way through James Bennett's tutorial on using AJAX with Django - he includes details on writing views that return JSON.

Answer 2

It's pretty simple:

1. Retrieve GET data from request.GET
2. Do stuff
3. Return a response with mimetype application/javascript

1 and 2 are like any other view. If you don't know how to do 3, check out django.http.HttpResponse.__init__

Answer 3

This is relatively straightforward

def json_view(request):
  username=request.GET.get('username')
  result='successName'
  if username:
    try:
      user=User.objects.get(username=username)
      result='existName'
    except User.DoesNotExist:
      pass
    return HttpResponse(simplejson.dumps({'result': result}))

Answer 4

def json_view(request):
  import json
  username=request.GET.get('username')
  result='successName'
  if username:
    try:
      user=User.objects.get(username=username)
      result='existName'
    except User.DoesNotExist:
      pass
    return HttpResponse(json.dumps({'result': result}))

it makes 500 INTERNAL SERVER ERROR.

why???