Assigning json to variable

Question

Ok, some explanation. Even though I don't think it has anything to do with the problem itself. I have a small django project that maps some data using leaflet. On a mouseover some ajax functionality is added, using the dajax(which is a "lightweight library to implement AJAX inside django projects") framework. The call itself looks like this:

dajax.add_data(simplejson.dumps(series), 'my_test_flot')

My js function receives json data which looks like this (using alert)

[{"color": "#dddd00", 
"data": [[-0.5, -20.5]], 
"label": "Tweede Zandlaag"}]

The object has more data to it but the problem is not with the object. When I copy/paste the data directly into the function var series = [] the behaviour is as aspected. As aspected means, the graph I'm drawing with flot is actually being drawn. Otherwise the graph remains empty.

function my_test_flot(dat) {
    function MyFormatter(v, xaxis) {
        return " ";
    }
    $(function () {
        alert(dat)
        var series = dat; // here lies the problem, but why?
        ...

Can anyone help?

I think you are missing a lot of information. For example, how is `my_test_flot` called? I don't think you have to use a `ready` event handler inside the function at all (assuming `$` refers to jQuery). — Felix Kling, Apr 26 '13 at 14:14
The question is quite confusing, please add more code or a better explanation to what you mean. — Turnerj, Apr 26 '13 at 14:17
You forgot to explain the problem. Also, are you _sure_ it's JSON (a string format), and not a Javascript object? — Lightness Races in Orbit, Apr 26 '13 at 14:20

score 3 · Accepted Answer · edited May 23 '17 at 12:14

3

Ok, problem solved. Apparently you have to use JSON.parse(). How it's done is explained here.

edited May 23 '17 at 12:14

Community

1
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answered Apr 26 '13 at 19:18

LarsVegas

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score 0 · Answer 2 · answered Apr 26 '13 at 14:15

0

This does not copy the data - it just makes series a reference to the same object as dat. Therefore, if you later modify the object, all users retaining references to it see the changes. This is probably what causes your trouble.

answered Apr 26 '13 at 14:15

Alexander Gessler

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Assigning json to variable

2 Answers2