Question

i work with d3.js and CodeIgniter and i have a problem when i get json data with d3.json
when i run this code :

var url = "http://probe.dev/draw/windRose?station=vp2&sensors=wind&Since=2012-10-15T00:00:00&StepUnit=DAY&StepNbr=6;
d3.json(url, function(d) {
    console.log(d); // print NULL in console
}

but it works with

$.getJSON(url, function(d) {
    console.log(d); // print my data object correctly
}

my php code is :

<?php
@ob_end_clean();
 header('Content-Type: "application/json"');
 header('Content-Disposition: attachment; filename="data.json"');
 header("Content-Transfer-Encoding: binary");
 header('Expires: 0');
 header('Pragma: no-cache');
 header("Content-Length: ".strlen($data));
  exit($data);

I don’t understand why d3.json do not work ?

Answer 1

I couldn’t make it work with v2, I moved to d3js.v3 and it worked.

The callback function in v3 takes two params:

d3.json(url, function(error, json) {
    if (error) return console.warn(error);
    else ...;
}