Getting serialized json objects from django templates?

Question

I need a clarification. If I for example do a view with a serialized object:

def sample(request):
    res = [{'name':'man'}]
    encoded = json.dumps(res)
    return render_to_response('sample/example.html',{'encoded':encoded} )

In my templates I pass:

{{encoded}}

Now from a python script can I do:

data = json.loads(urllib2.urlopen(url/to/site).read()

It says ValueError: No JSON object could be decoded. But isn't {{encoded}} a json object? And if so how would I get it?

Thank you

I'd do a print urllib2.urlopen(url/to/site).read() first. I'm betting that Django escapes the string. — Blender
– Blender, Commented Feb 9, 2012 at 16:24
That's an escaped HTML string. " should be a '. See my answer. — Blender
– Blender, Commented Feb 9, 2012 at 16:31

Blender · Accepted Answer · 2012-02-09 16:30:46Z

9

Try this in your template:

{% autoescape off %} 
  {{ encoded }}
{% endautoescape %}

answered Feb 9, 2012 at 16:30

Blender

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2 Comments

Neeran Over a year ago

I get [{"name": "man"}] using autoescape in print urllib2.urlopen but still can't decode the json object. Thank you very much.

Blender Over a year ago

Is there anything else besides that text in the page? Any HTML code?

Mu Mind · Accepted Answer · 2012-02-09 16:36:21Z

1

You will probably find that there are quote marks getting escaped by Django. I had a similar problem with a Jinja2 template recently. In my case, the JSON was going into an HTML data attribute and was escaping things improperly. After I used a filter to mark it safe, it stopped escaping the quote marks and there were mismatched quotes. The solution was

{% set dbl_quote='"' %}
{{ encoded |replace(dbl_quote, '&quot;') |safe}}

but that will probably look different in Django.

You may need to use {% autoescape off %} or something similar instead if you're templating it straight into Javascript, etc.

answered Feb 9, 2012 at 16:36

Mu Mind

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1 Comment

Mu Mind Over a year ago

And whatever you do, you might want to do something like this snippet to convert to JSON in a filter so if you have to mark it safe or whatever you can do that in one place inside the filter.

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