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Last active Nov 16, 2018

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D3.js tree diagram generated from external (JSON) data

This is a simple d3.js tree diagram that loads an external data file as used as an example in the book D3 Tips and Tricks.

It is derived from the Mike Bostock Collapsible tree example but it is a VERY cut down version without the ability to update (collapse).

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Collapsible Tree Example</title>
<style>
.node circle {
fill: #fff;
stroke: steelblue;
stroke-width: 3px;
}
.node text { font: 12px sans-serif; }
.link {
fill: none;
stroke: #ccc;
stroke-width: 2px;
}
</style>
</head>
<body>
<!-- load the d3.js library -->
<script src="http://d3js.org/d3.v3.min.js"></script>
<script>
// ************** Generate the tree diagram *****************
var margin = {top: 20, right: 120, bottom: 20, left: 120},
width = 960 - margin.right - margin.left,
height = 500 - margin.top - margin.bottom;
var i = 0;
var tree = d3.layout.tree()
.size([height, width]);
var diagonal = d3.svg.diagonal()
.projection(function(d) { return [d.y, d.x]; });
var svg = d3.select("body").append("svg")
.attr("width", width + margin.right + margin.left)
.attr("height", height + margin.top + margin.bottom)
.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
// load the external data
d3.json("treeData.json", function(error, treeData) {
root = treeData[0];
update(root);
});
function update(source) {
// Compute the new tree layout.
var nodes = tree.nodes(root).reverse(),
links = tree.links(nodes);
// Normalize for fixed-depth.
nodes.forEach(function(d) { d.y = d.depth * 180; });
// Declare the nodes…
var node = svg.selectAll("g.node")
.data(nodes, function(d) { return d.id || (d.id = ++i); });
// Enter the nodes.
var nodeEnter = node.enter().append("g")
.attr("class", "node")
.attr("transform", function(d) {
return "translate(" + d.y + "," + d.x + ")"; });
nodeEnter.append("circle")
.attr("r", 10)
.style("fill", "#fff");
nodeEnter.append("text")
.attr("x", function(d) {
return d.children || d._children ? -13 : 13; })
.attr("dy", ".35em")
.attr("text-anchor", function(d) {
return d.children || d._children ? "end" : "start"; })
.text(function(d) { return d.name; })
.style("fill-opacity", 1);
// Declare the links…
var link = svg.selectAll("path.link")
.data(links, function(d) { return d.target.id; });
// Enter the links.
link.enter().insert("path", "g")
.attr("class", "link")
.attr("d", diagonal);
}
</script>
</body>
</html>
[
{
"name": "Top Level",
"parent": "null",
"children": [
{
"name": "Level 2: A",
"parent": "Top Level",
"children": [
{
"name": "Son of A",
"parent": "Level 2: A"
},
{
"name": "Daughter of A",
"parent": "Level 2: A"
}
]
},
{
"name": "Level 2: B",
"parent": "Top Level"
}
]
}
]
@EverettBerry

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EverettBerry commented Jun 16, 2015

Awesome! This really, really helped me.

@remaudga

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remaudga commented Jan 11, 2016

treeData undefined... am I missing something ?

@wakasann

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wakasann commented Apr 18, 2016

Thank you very much!This helped me.

@patidar05priya

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patidar05priya commented Jun 4, 2016

Hello
Its not working for my json file.

{
"Malaria":
{"children":["Plasmodium sp. LECOR04","Haemoproteus sp. Arg_H9"],
"type": "Disease"},

"Plasmodium sp. LECOR04":
    {"children":["cytb"],
    "type":"organism"},

"Haemoproteus sp. Arg_H9":
    {"children":["cytb"],
    "type":"organism"},

"cytb":{
    "children":["Uganda","Uruguay"],
    "type":"gene"},

"Uganda":{
    "children":[],
    "type":"location"},

"Uruguay":{
    "children":[],
    "type":"Location"},

"Anopheles funestus":{
    "children":["ace-1"],
    "type":"organism"},

"ace-1":{
    "children":["Spain"],
    "type":"gene"},

"Spain":{
    "children":[],
    "type":location"},

"Plasmodium falciparum":{
    "children":["msp3"],
    "type":"organism"},

"msp3":{
    "children":["Italy"],
    "type":"gene"},

"Italy":{
    "children":[],
    "type":"location"},

}

Please help me.

Thanks
Priya

@andrsGutirrz

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andrsGutirrz commented Nov 16, 2018

treeData undefined... am I missing something ?

You need to delete the semicolon in the json file

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