Fetching and using python nested list into JS using django

Question

I have a page which displays some data. The data it displays needs to be in JS Array format (representing the python nested list).

In order to do this, I use a JS function that fetches the data from a django view:

js function:

var getDataFromFiles1 = function(theUrl) {
    $.ajaxSetup({async: false});
    var xmlHttp = new XMLHttpRequest();
        xmlHttp.open( "GET", theUrl, false );
        xmlHttp.send( null );
        return xmlHttp.responseText;
};

views.py:

a = MyModel.objects.get(c=b, x=y)
json_object = json.dumps(a.data)
return HttpResponse(json_object, content_type="application/javascript")

However, the data that comes back is typeof string, and I thought that I could just use JSON.parse() to pull into a JS Array, however this does not work:

var data = getDataFromFiles1(url);
console.log(data + " : " + typeof data)
data = JSON.parse(data)
console.log(data + " : " + typeof data)

and the logging included above gives:

"[[\"example\", \"example\", \"example\", \"example\", \"not set\"], [\"example\", \"example\", \"example\", \"example\", \"not set\"]]" : string

and

[["example", "example", "example", "example", "not set"], ["example", "example", "example", "example", "not set"]] : string

Am I missing something obvious? How do I create a JS Array object with this data (with the flexibility of not dropping the data in with template tags on load?

Daniel Roseman · Accepted Answer · 2015-07-13 11:43:12Z

2

You don't show your model, but I would guess a.data is already JSON - so you're double-encoding it.

Drop the json.dumps and just return HttpResponse(a.data, content_type="application/javascript").

answered Jul 13, 2015 at 11:43

Daniel Roseman

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1 Comment

franciscod Over a year ago

this has an advantage over my answer and should be the accepted one: it does not waste a full json.dumps-->JSON.parse cycle!

franciscod · Accepted Answer · 2015-07-13 11:30:32Z

1

Try to JSON.parse(...) it again. Maybe the Python side is already JSON-encoding it due to content_type="application/javascript".

answered Jul 13, 2015 at 11:30

franciscod

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1 Comment

franciscod Over a year ago

take a look at Daniel Roseman's answer too, I think that works better!

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