nlinc1905/index.html

## index.html
<!DOCTYPE html>
<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html;charset=utf-8">
    <title>Node-Link Tree</title>
    <script type="text/javascript" src="http://mbostock.github.com/d3/d3.js?1.27.2s"></script>
    <script type="text/javascript" src="http://mbostock.github.com/d3/d3.layout.js?1.27.2"></script>
    <style type="text/css">

.node circle {
  cursor: pointer;
  fill: #fff;
  stroke: steelblue;
  stroke-width: 1.5px;
}

.node text {
  font: 14px times;
}

path.link {
  fill: none;
  stroke: #ccc;
  stroke-width: 2.5px;
}

    </style>
  </head>
  <body>
    <div id="chart"></div>
    <script type="text/javascript">

var m = [20, 120, 20, 120],
    w = 2560 - m[1] - m[3],
    h = 640 - m[0] - m[2],
    i = 0,
    duration = 500;

var root = {"name" : "Physical Sciences", "children" : [
  {"name" : "Astronomy", "children" : [
    {"name" : "Cosmology"} ]
  },
  {"name" : "Chemistry", "children" : [
    {"name" : "Biochemistry"},
    {"name" : "Environmental Chemistry"},
    {"name" : "Pharmaceutical Chemistry"},
    {"name" : "Organic Chemistry"},
    {"name" : "Physical Chemistry"},
    {"name" : "Polymer Chemistry"} ]
  },
  {"name" : "Computer Science", "children" : [
    {"name" : "Robotics"},
    {"name" : "Systems Architecture"},
    {"name" : "Database and Information Systems"},
    {"name" : "Graphics"},
    {"name" : "Scientific Computing", "children" : [
      {"name" : "Machine Learning"},
      {"name" : "Cryptanalysis"} ]
    },
    {"name" : "Software Engineering"},
    {"name" : "Theory and Algorithms"} ]
  },
  {"name" : "Earth Science", "children" : [
    {"name" : "Environmental Science"},
    {"name" : "Geology"},
    {"name" : "Seismology"},
    {"name" : "Glacioilogy"},
    {"name" : "Paleontology", "children" : [
      {"name" : "Paleoclimatology"},
      {"name" : "Paleoecology"},
      {"name" : "Micropaleontology"} ]
    },
    {"name" : "Tectonics"},
    {"name" : "Vulcanology"} ]
  },
  {"name" : "Mathematics", "children" : [
    {"name" : "Algebra", "children" : [
      {"name" : "Non-linear Algebra"},
      {"name" : "Algebraic Geometry"} ]
    },
    {"name" : "Geometry", "children" : [
      {"name" : "Topology"} ]
    },
    {"name" : "Trigonometry"},
    {"name" : "Logic"},
    {"name" : "Number Theory", "children" : [
      {"name" : "Combinatorics"} ]
    } ]
  },
  {"name" : "Physics", "children" : [
    {"name" : "Non-linear Dynamics", "children" : [
      {"name" : "Fluid Dynamics"},
      {"name" : "Thermodynamics"} ]
    },
    {"name" : "Quantum Physics", "children" : [
      {"name" : "Solid-state Physics"},
      {"name" : "Atomic Physics"},
      {"name" : "Computational Physics"} ]
    },
    {"name" : "Acoustics"},
    {"name" : "Ballistics"},
    {"name" : "Optics"} ]
  },
  {"name" : "Statistics", "children" : [
    {"name" : "Applied Statistics"},
    {"name" : "Biostatistics"},
    {"name" : "Probability Theory"},
    {"name" : "Data Science", "children" : [
      {"name" : "Visualization"},
      {"name" : "Uncertainty Modeling"},
      {"name" : "Predictive Analytics"},
      {"name" : "Data Mining"},
      {"name" : "Computational Statistics"} ]
    } ]
  }
]};

var tree = d3.layout.tree()
    .size([h, w]);

var diagonal = d3.svg.diagonal()
    .projection(function(d) { return [d.y, d.x]; });

var vis = d3.select("#chart").append("svg:svg")
    .attr("width", w + m[1] + m[3])
    .attr("height", h + m[0] + m[2])
  .append("svg:g")
    .attr("transform", "translate(" + m[3] + "," + m[0] + ")");

  root.x0 = h / 2;
  root.y0 = 0;

  function collapse(d) {
    if (d.children) {
      d._children = d.children;
      d._children.forEach(collapse);
      d.children = null;
    }
  }

  root.children.forEach(collapse);
  update(root);

function update(source) {

  // Compute the new tree layout.
  var nodes = tree.nodes(root).reverse();

  // Normalize for fixed-depth.
  nodes.forEach(function(d) { d.y = d.depth * 180; });

  // Update the nodes…
  var node = vis.selectAll("g.node")
      .data(nodes, function(d) { return d.id || (d.id = ++i); });

  // Enter any new nodes at the parent's previous position.
  var nodeEnter = node.enter().append("svg:g")
      .attr("class", "node")
      .attr("transform", function(d) { return "translate(" + source.y0 + "," + source.x0 + ")"; })
      .on("click", click);

  nodeEnter.append("svg:circle")
      .attr("r", 1e-6)
      .style("fill", function(d) { return d._children ? "lightsteelblue" : "#fff"; });

  nodeEnter.append("svg:text")
      .attr("x", function(d) { return d.children || d._children ? -10 : 10; })
      .attr("dy", ".35em")
      .attr("text-anchor", function(d) { return d.children || d._children ? "end" : "start"; })
      .text(function(d) { return d.name; })
      .style("fill-opacity", 1e-6);

  // Transition nodes to their new position.
  var nodeUpdate = node.transition()
      .duration(duration)
      .attr("transform", function(d) { return "translate(" + d.y + "," + d.x + ")"; });

  nodeUpdate.select("circle")
      .attr("r", 4.5)
      .style("fill", function(d) { return d._children ? "lightsteelblue" : "#fff"; });

  nodeUpdate.select("text")
      .style("fill-opacity", 1);

  // Transition exiting nodes to the parent's new position.
  var nodeExit = node.exit().transition()
      .duration(duration)
      .attr("transform", function(d) { return "translate(" + source.y + "," + source.x + ")"; })
      .remove();

  nodeExit.select("circle")
      .attr("r", 1e-6);

  nodeExit.select("text")
      .style("fill-opacity", 1e-6);

  // Update the links…
  var link = vis.selectAll("path.link")
      .data(tree.links(nodes), function(d) { return d.target.id; });

  // Enter any new links at the parent's previous position.
  link.enter().insert("svg:path", "g")
      .attr("class", "link")
      .attr("d", function(d) {
        var o = {x: source.x0, y: source.y0};
        return diagonal({source: o, target: o});
      })
    .transition()
      .duration(duration)
      .attr("d", diagonal);

  // Transition links to their new position.
  link.transition()
      .duration(duration)
      .attr("d", diagonal);

  // Transition exiting nodes to the parent's new position.
  link.exit().transition()
      .duration(duration)
      .attr("d", function(d) {
        var o = {x: source.x, y: source.y};
        return diagonal({source: o, target: o});
      })
      .remove();

  // Stash the old positions for transition.
  nodes.forEach(function(d) {
    d.x0 = d.x;
    d.y0 = d.y;
  });
}

// 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>
	<!DOCTYPE html>
	<html>
	<head>
	<meta http-equiv="Content-Type" content="text/html;charset=utf-8">
	<title>Node-Link Tree</title>
	<script type="text/javascript" src="http://mbostock.github.com/d3/d3.js?1.27.2s"></script>
	<script type="text/javascript" src="http://mbostock.github.com/d3/d3.layout.js?1.27.2"></script>
	<style type="text/css">

	.node circle {
	cursor: pointer;
	fill: #fff;
	stroke: steelblue;
	stroke-width: 1.5px;
	}

	.node text {
	font: 14px times;
	}

	path.link {
	fill: none;
	stroke: #ccc;
	stroke-width: 2.5px;
	}

	</style>
	</head>
	<body>
	<div id="chart"></div>
	<script type="text/javascript">

	var m = [20, 120, 20, 120],
	w = 2560 - m[1] - m[3],
	h = 640 - m[0] - m[2],
	i = 0,
	duration = 500;

	var root = {"name" : "Physical Sciences", "children" : [
	{"name" : "Astronomy", "children" : [
	{"name" : "Cosmology"} ]
	},
	{"name" : "Chemistry", "children" : [
	{"name" : "Biochemistry"},
	{"name" : "Environmental Chemistry"},
	{"name" : "Pharmaceutical Chemistry"},
	{"name" : "Organic Chemistry"},
	{"name" : "Physical Chemistry"},
	{"name" : "Polymer Chemistry"} ]
	},
	{"name" : "Computer Science", "children" : [
	{"name" : "Robotics"},
	{"name" : "Systems Architecture"},
	{"name" : "Database and Information Systems"},
	{"name" : "Graphics"},
	{"name" : "Scientific Computing", "children" : [
	{"name" : "Machine Learning"},
	{"name" : "Cryptanalysis"} ]
	},
	{"name" : "Software Engineering"},
	{"name" : "Theory and Algorithms"} ]
	},
	{"name" : "Earth Science", "children" : [
	{"name" : "Environmental Science"},
	{"name" : "Geology"},
	{"name" : "Seismology"},
	{"name" : "Glacioilogy"},
	{"name" : "Paleontology", "children" : [
	{"name" : "Paleoclimatology"},
	{"name" : "Paleoecology"},
	{"name" : "Micropaleontology"} ]
	},
	{"name" : "Tectonics"},
	{"name" : "Vulcanology"} ]
	},
	{"name" : "Mathematics", "children" : [
	{"name" : "Algebra", "children" : [
	{"name" : "Non-linear Algebra"},
	{"name" : "Algebraic Geometry"} ]
	},
	{"name" : "Geometry", "children" : [
	{"name" : "Topology"} ]
	},
	{"name" : "Trigonometry"},
	{"name" : "Logic"},
	{"name" : "Number Theory", "children" : [
	{"name" : "Combinatorics"} ]
	} ]
	},
	{"name" : "Physics", "children" : [
	{"name" : "Non-linear Dynamics", "children" : [
	{"name" : "Fluid Dynamics"},
	{"name" : "Thermodynamics"} ]
	},
	{"name" : "Quantum Physics", "children" : [
	{"name" : "Solid-state Physics"},
	{"name" : "Atomic Physics"},
	{"name" : "Computational Physics"} ]
	},
	{"name" : "Acoustics"},
	{"name" : "Ballistics"},
	{"name" : "Optics"} ]
	},
	{"name" : "Statistics", "children" : [
	{"name" : "Applied Statistics"},
	{"name" : "Biostatistics"},
	{"name" : "Probability Theory"},
	{"name" : "Data Science", "children" : [
	{"name" : "Visualization"},
	{"name" : "Uncertainty Modeling"},
	{"name" : "Predictive Analytics"},
	{"name" : "Data Mining"},
	{"name" : "Computational Statistics"} ]
	} ]
	}
	]};

	var tree = d3.layout.tree()
	.size([h, w]);

	var diagonal = d3.svg.diagonal()
	.projection(function(d) { return [d.y, d.x]; });

	var vis = d3.select("#chart").append("svg:svg")
	.attr("width", w + m[1] + m[3])
	.attr("height", h + m[0] + m[2])
	.append("svg:g")
	.attr("transform", "translate(" + m[3] + "," + m[0] + ")");

	root.x0 = h / 2;
	root.y0 = 0;

	function collapse(d) {
	if (d.children) {
	d._children = d.children;
	d._children.forEach(collapse);
	d.children = null;
	}
	}

	root.children.forEach(collapse);
	update(root);

	function update(source) {

	// Compute the new tree layout.
	var nodes = tree.nodes(root).reverse();

	// Normalize for fixed-depth.
	nodes.forEach(function(d) { d.y = d.depth * 180; });

	// Update the nodes…
	var node = vis.selectAll("g.node")
	.data(nodes, function(d) { return d.id \|\| (d.id = ++i); });

	// Enter any new nodes at the parent's previous position.
	var nodeEnter = node.enter().append("svg:g")
	.attr("class", "node")
	.attr("transform", function(d) { return "translate(" + source.y0 + "," + source.x0 + ")"; })
	.on("click", click);

	nodeEnter.append("svg:circle")
	.attr("r", 1e-6)
	.style("fill", function(d) { return d._children ? "lightsteelblue" : "#fff"; });

	nodeEnter.append("svg:text")
	.attr("x", function(d) { return d.children \|\| d._children ? -10 : 10; })
	.attr("dy", ".35em")
	.attr("text-anchor", function(d) { return d.children \|\| d._children ? "end" : "start"; })
	.text(function(d) { return d.name; })
	.style("fill-opacity", 1e-6);

	// Transition nodes to their new position.
	var nodeUpdate = node.transition()
	.duration(duration)
	.attr("transform", function(d) { return "translate(" + d.y + "," + d.x + ")"; });

	nodeUpdate.select("circle")
	.attr("r", 4.5)
	.style("fill", function(d) { return d._children ? "lightsteelblue" : "#fff"; });

	nodeUpdate.select("text")
	.style("fill-opacity", 1);

	// Transition exiting nodes to the parent's new position.
	var nodeExit = node.exit().transition()
	.duration(duration)
	.attr("transform", function(d) { return "translate(" + source.y + "," + source.x + ")"; })
	.remove();

	nodeExit.select("circle")
	.attr("r", 1e-6);

	nodeExit.select("text")
	.style("fill-opacity", 1e-6);

	// Update the links…
	var link = vis.selectAll("path.link")
	.data(tree.links(nodes), function(d) { return d.target.id; });

	// Enter any new links at the parent's previous position.
	link.enter().insert("svg:path", "g")
	.attr("class", "link")
	.attr("d", function(d) {
	var o = {x: source.x0, y: source.y0};
	return diagonal({source: o, target: o});
	})
	.transition()
	.duration(duration)
	.attr("d", diagonal);

	// Transition links to their new position.
	link.transition()
	.duration(duration)
	.attr("d", diagonal);

	// Transition exiting nodes to the parent's new position.
	link.exit().transition()
	.duration(duration)
	.attr("d", function(d) {
	var o = {x: source.x, y: source.y};
	return diagonal({source: o, target: o});
	})
	.remove();

	// Stash the old positions for transition.
	nodes.forEach(function(d) {
	d.x0 = d.x;
	d.y0 = d.y;
	});
	}

	// 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>