jQuery parsererror on simple JSON returned from Django

Question

I'm doing a pretty simple thing here, making a POST request to Django from jQuery, and I'm getting a strange error for a pretty simple scenario. I have the following view function:

from django.views.generic.simple import direct_to_template as dto

def do_login(request):
    if request.method == "POST":
        return dto(request, "path/to/template.json", {
            'success': False,
            'cause': None
        }, mimetype="text/json")

Here's my template:

{ success : {{success|lower}}{% if cause %}, cause : {{cause}}{% endif %} }

...and here's my jQuery:

$.ajax("/login/", { type: "POST",
    data: $("#loginForm").serialize(),
    success: function(data) {
        console.log("login response: " + data);
    },
    error: function(data, stats, error) {
        console.log("login fault: " + data + ", " + 
                stats + ", " + error);
    }
});

Pretty simple, right? Here's what I get in the console:

login fault: [object Object], parsererror, SyntaxError: Unexpected token s

What's going wrong here? If I don't set the mimetype on my render method, then everything works fine. The problem is, I'd like to return JSON without having to force jQuery to reparse it. Can anyone spot my mistake here? I can't seem to see it.

Guffa · Accepted Answer · 2011-09-19 00:55:44Z

2

The JSON is not valid. You need quotation marks around the identifiers, so "success" instead of success and "cause" instead of cause.

answered Sep 19, 2011 at 0:55

Guffa

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1 Comment

Naftuli Kay Over a year ago

Thanks, that fixed it. I didn't know this was required, as in JS { success: true } is the same as { 'success': true }.

Alexey · Accepted Answer · 2011-09-19 13:27:42Z

1

from django.utils import simplejson as json

def do_login(request):
    if request.method == "POST":
        return HttpResponse(json.dumps({'success': False, 'cause': None}), content_type='application/json')

answered Sep 19, 2011 at 13:27

Alexey

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1 Comment

Naftuli Kay Over a year ago

Super helpful, thanks. That makes things a little easier and means I don't have to write a template for it.

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