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This might be a slightly silly question for those of you more familiar with d3 but I'm fairly new to it and I can't quite figure out how to get this thing to work:
What I'm trying to achieve is this: http://bl.ocks.org/robschmuecker/7880033
But I'd like to feed it the data from a flat CSV rather than a JSON.
The problem is that the CSV I have is formatted like so:
Parent Name | Child Name
-------------------------
Parent Name | Child Name
-------------------------
Parent Name | Child Name
so on...Could someone please point me in the right direction? I know that the d3.csv function works somehow, but I have no idea how to 'plug it' into the example above.
I do apologise, I know this very much sounds like "Do my homework for me", but I've honestly given it a good go and I think I'm stuck.
Thank you. Appreciated.
694
I haven't seen what you are looking for done before, but it is a combination of creating a tree from flat data (which requires a bit of data manipulation to finesse it into the correct structure) and the standard loading data from and external source with d3.
Sadly I'm not able to set up a bl.ock for you to demonstrate live code,EDIT: Here is a live version of the running code on bl.ocks.org, and the following is the html file which is the combination of the two techniques;
<!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.csv("treedata.csv", function(error, data) {
// *********** Convert flat data into a nice tree ***************
// create a name: node map
var dataMap = data.reduce(function(map, node) {
map[node.name] = node;
return map;
}, {});
// create the tree array
var treeData = [];
data.forEach(function(node) {
// add to parent
var parent = dataMap[node.parent];
if (parent) {
// create child array if it doesn't exist
(parent.children || (parent.children = []))
// add node to child array
.push(node);
} else {
// parent is null or missing
treeData.push(node);
}
});
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>And the following is the csv file I tested it with (named treedata.csv in the html file);
name,parent
Level 2: A,Top Level
Top Level,null
Son of A,Level 2: A
Daughter of A,Level 2: A
Level 2: B,Top Level
Kudos should go to nrabinowitz for describing the data transformation here.
145
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