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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Tree Example</title>
<style>
body {
background-color: white;
}
.node {
cursor: pointer;
}
.node circle {
fill: #fff;
stroke: steelblue;
stroke-width: 3px;
}
.node text {
font: 12px sans-serif;
}
div.tooltip {
position: absolute;
text-align: center;
width: 100px;
height: 50x;
padding: 2px;
font: 15px sans-serif;
color: black;
background: lightsteelblue;
border: 0px;
border-radius: 8px;
pointer-events: none;
}
.link {
fill: none;
stroke: #ccc;
stroke-width: 2px;
}
</style>
</head>
<body>
<div>
</div>
<!-- load the d3.js library -->
<script src="https://d3js.org/d3.v5.min.js"></script>
<script>
const flatData = [
{ "name": "Eve", "parent": "" },
{ "name": "Cain", "parent": "Eve" },
{ "name": "Seth", "parent": "Eve" },
{ "name": "Enos", "parent": "Seth" },
{ "name": "Noam", "parent": "Seth" },
{ "name": "Abel", "parent": "Eve" },
{ "name": "Awan", "parent": "Eve" },
{ "name": "Enoch", "parent": "Awan" },
{ "name": "Azura", "parent": "Eve" }
]
var treeData = d3.stratify().id(function(d) { return d.name }).parentId(function(d) { return d.parent; })(flatData);
console.log(treeData)
// create a name: node map
// var dataMap = flatData.reduce(function (map, node) {
// map[node.name] = node;
// return map;
// }, {});
// // create the tree array
// var treeData = [];
// flatData.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);
// }
// });
// var treeData = reactJSON
// Set the dimensions and margins of the diagram
var margin = { top: 20, right: 90, bottom: 30, left: 90 },
width = 960 - margin.left - margin.right,
height = 500 - margin.top - margin.bottom;
// append the svg object to the body of the page
// appends a 'group' element to 'svg'
// moves the 'group' element to the top left margin
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 + ")");
var i = 0,
duration = 750,
root;
// declares a tree layout and assigns the size
var treemap = d3.tree().size([height, width]);
// Assigns parent, children, height, depth
root = d3.hierarchy(treeData, function (d) { return d.children; });
root.x0 = height / 2;
root.y0 = 0;
// Collapse after the second level
//root.children.forEach(collapse);
update(root);
// Collapse the node and all it's children
// function collapse(d) {
// if(d.children) {
// d._children = d.children
// d._children.forEach(collapse)
// d.children = null
// }
// }
function update(source) {
// Assigns the x and y position for the nodes
var treeData = treemap(root);
// Compute the new tree layout.
var nodes = treeData.descendants(),
links = treeData.descendants().slice(1);
// Normalize for fixed-depth.
nodes.forEach(function (d) { d.y = d.depth * 180 });
// ****************** Nodes section ***************************
// Update the nodes...
var node = svg.selectAll('g.node')
.data(nodes, function (d) { return d.id || (d.id = ++i); });
// Enter any new modes at the parent's previous position.
var nodeEnter = node.enter().append('g')
.attr('class', 'node')
.attr("transform", function (d) {
return "translate(" + source.y0 + "," + source.x0 + ")";
})
.on('click', click);
// Add Circle for the nodes
nodeEnter.append('circle')
.attr('class', 'node')
.attr('r', 1e-6)
.style("fill", function (d) {
return d._children ? "lightsteelblue" : "#fff";
});
// Add labels for the nodes
nodeEnter.append('text')
.attr("dy", ".35em")
.attr("x", function (d) {
return d.children || d._children ? -13 : 13;
})
.attr("text-anchor", function (d) {
return d.children || d._children ? "end" : "start";
})
.text(function (d) { return d.data.name; });
// UPDATE
var nodeUpdate = nodeEnter.merge(node);
// Transition to the proper position for the node
nodeUpdate.transition()
.duration(duration)
.attr("transform", function (d) {
return "translate(" + d.y + "," + d.x + ")";
});
// Update the node attributes and style
nodeUpdate.select('circle.node')
.attr('r', 10)
.style("fill", function (d) {
return d._children ? "lightsteelblue" : "#fff";
})
.attr('cursor', 'pointer');
// Remove any exiting nodes
var nodeExit = node.exit().transition()
.duration(duration)
.attr("transform", function (d) {
return "translate(" + source.y + "," + source.x + ")";
})
.remove();
// On exit reduce the node circles size to 0
nodeExit.select('circle')
.attr('r', 1e-6);
// On exit reduce the opacity of text labels
nodeExit.select('text')
.style('fill-opacity', 1e-6);
// ****************** links section ***************************
// Update the links...
var link = svg.selectAll('path.link')
.data(links, function (d) { return d.id; });
// Enter any new links at the parent's previous position.
var linkEnter = link.enter().insert('path', "g")
.attr("class", "link")
.attr('d', function (d) {
var o = { x: source.x0, y: source.y0 }
return diagonal(o, o)
});
// UPDATE
var linkUpdate = linkEnter.merge(link);
// Transition back to the parent element position
linkUpdate.transition()
.duration(duration)
.attr('d', function (d) { return diagonal(d, d.parent) });
// Remove any exiting links
var linkExit = link.exit().transition()
.duration(duration)
.attr('d', function (d) {
var o = { x: source.x, y: source.y }
return diagonal(o, o)
})
.remove();
// Store the old positions for transition.
nodes.forEach(function (d) {
d.x0 = d.x;
d.y0 = d.y;
});
// Creates a curved (diagonal) path from parent to the child nodes
function diagonal(s, d) {
path = 'M ' + s.y + ' ' + s.x +
'C ' + (s.y + d.y) / 2 + ' ' + s.x + ', '
+ (s.y + d.y) / 2 + ' ' + d.x + ', '
+ d.y + ' ' + d.x
return path.toString();
}
// Toggle children on click.
function click(d) {
if (d.children) {
d._children = d.children;
d.children = null;
} else {
d.children = d._children;
d._children = null;
}
update(d);
}
}
</script>
</body>
</html>