D3.js can't load json file
I am trying to create a D3.js packed circle diagram.
When I embed the data in the HTML file, it works fine. When I put the data in an external file, I get nothing (blank DOM, no console msgs).
If you uncomment the var data declaration and comment out the d3.json (and the corresponding closing parentheses) it works fine.
I can see the "2013 Inf-2.json" file in the browser and it appears well formed (it passes jsonlint validation). It includes everything from the first "{" through/including the last "}". Much as the embedded example.
I'm running this through httpd (:80) on OSX Mavericks and trying to render the chart in Chrome or Safari.
<!DOCTYPE html>
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<html lang="en">
<head>
<meta charset="utf-8">
<title></title>
<script type="text/javascript" src="./d3.v3.min.js"></script>
</head>
<body>
<div id="chart2"></div>
<script type="text/javascript">
var w = 640, h = 480;
/*
var data ={
"name" : "root",
"children" : [
{
"name":"URIN TRACT INFECTION NOS",
"size":12196
},
{
"name":"ACUTE PHARYNGITIS",
"size":6679
},
{
"name":"PNEUMONIA ORGANISM NOS",
"size":6452
},
{
"name":"BRONCHITIS NOS",
"size":2636
},
{
"name":"CELLULITIS OF LEG",
"size":2348
},
{
"name":"OBSTR CHRONIC BRONCHITIS W (ACUTE) EXACERBATION",
"size":2203
}
]
}
*/
var data = d3.json("2013 Inf-2.json", function(error, root) {
var canvas = d3.select("#chart2")
.append("svg:svg")
.attr("width", w)
.attr("height", h);
var nodes = d3.layout.pack()
.value(function(d) { return d.size; })
.size([w, h])
.nodes(data);
// Get rid of root node
nodes.shift();
canvas.selectAll("circles")
.data(nodes)
.enter().append("svg:circle")
.attr("cx", function(d) { return d.x; })
.attr("cy", function(d) { return d.y; })
.attr("r", function(d) { return d.r; })
.attr("fill", "green")
.attr("stroke", "grey");
});
</script>
</html>
Answer
You should change line
var data = d3.json("2013 Inf-2.json", function(error, root) {
to
var data = d3.json("2013 Inf-2.json", function(error, data) {
So you just have to replace "root" with "data"