d3noob/.block

## .block
license: mit

## README.md

      
    Raw
  

              README.md
            
          
    This is a tree diagram that used data from a csv file.
This is designed to be used as part of documenting an update to the book D3 Tips and Tricks to version 7 of d3.js.

  
## index.html
<!DOCTYPE html>
<meta charset="utf-8">
<style> /* set the CSS */

.node circle {
  fill: #fff;
  stroke: steelblue;
  stroke-width: 3px;
}

.node text { font: 12px sans-serif; }

.node--internal text {
  text-shadow: 0 1px 0 #fff, 0 -1px 0 #fff, 1px 0 0 #fff, -1px 0 0 #fff;
}

.link {
  fill: none;
  stroke: #ccc;
  stroke-width: 2px;
}

</style>

<body>

<!-- load the d3.js library -->
<script src="https://d3js.org/d3.v7.min.js"></script>
<script>

// set the dimensions and margins of the diagram
var margin = {top: 20, right: 90, bottom: 30, left: 90},
    width = 660 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;

// declares a tree layout and assigns the size
var treemap = d3.tree()
    .size([height, width]);

// load the external data
d3.csv("treeCsv.csv").then(function(flatData) {

  // assign null correctly
  flatData.forEach(function(d) {
      if (d.parent == "null") { d.parent = null};
    });

  // convert the flat data into a hierarchy
  var treeData = d3.stratify()
    .id(function(d) { return d.name; })
    .parentId(function(d) { return d.parent; })
    (flatData);

  // assign the name to each node
  treeData.each(function(d) {
      d.name = d.id;
    });

  //  assigns the data to a hierarchy using parent-child relationships
  var nodes = d3.hierarchy(treeData, function(d) {
    return d.children;
    });

  // maps the node data to the tree layout
  nodes = treemap(nodes);

  // 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.left + margin.right)
      .attr("height", height + margin.top + margin.bottom),
    g = svg.append("g")
      .attr("transform",
        "translate(" + margin.left + "," + margin.top + ")");

  // adds the links between the nodes
  var link = g.selectAll(".link")
    .data( nodes.descendants().slice(1))
    .enter().append("path")
    .attr("class", "link")
    .attr("d", function(d) {
       return "M" + d.y + "," + d.x
       + "C" + (d.y + d.parent.y) / 2 + "," + d.x
       + " " + (d.y + d.parent.y) / 2 + "," + d.parent.x
       + " " + d.parent.y + "," + d.parent.x;
       });

  // adds each node as a group
  var node = g.selectAll(".node")
    .data(nodes.descendants())
    .enter().append("g")
    .attr("class", function(d) {
      return "node" +
      (d.children ? " node--internal" : " node--leaf"); })
    .attr("transform", function(d) {
      return "translate(" + d.y + "," + d.x + ")"; });

  // adds the circle to the node
  node.append("circle")
    .attr("r", 10);

  // adds the text to the node
  node.append("text")
    .attr("dy", ".35em")
    .attr("x", function(d) { return d.children ? -13 : 13; })
    .style("text-anchor", function(d) {
    return d.children ? "end" : "start"; })
    .text(function(d) { return d.data.name; });

});

</script>
</body>

## treeCsv.csv

          
            name
            parent

            
              Top Level
              null

            
              Level 2: A
              Top Level

            
              Level 2: B
              Top Level

            
              Son of A
              Level 2: A

            
              Daughter of A
              Level 2: A
	<!DOCTYPE html>
	<meta charset="utf-8">
	<style> /* set the CSS */

	.node circle {
	fill: #fff;
	stroke: steelblue;
	stroke-width: 3px;
	}

	.node text { font: 12px sans-serif; }

	.node--internal text {
	text-shadow: 0 1px 0 #fff, 0 -1px 0 #fff, 1px 0 0 #fff, -1px 0 0 #fff;
	}

	.link {
	fill: none;
	stroke: #ccc;
	stroke-width: 2px;
	}

	</style>

	<body>

	<!-- load the d3.js library -->
	<script src="https://d3js.org/d3.v7.min.js"></script>
	<script>

	// set the dimensions and margins of the diagram
	var margin = {top: 20, right: 90, bottom: 30, left: 90},
	width = 660 - margin.left - margin.right,
	height = 500 - margin.top - margin.bottom;

	// declares a tree layout and assigns the size
	var treemap = d3.tree()
	.size([height, width]);

	// load the external data
	d3.csv("treeCsv.csv").then(function(flatData) {

	// assign null correctly
	flatData.forEach(function(d) {
	if (d.parent == "null") { d.parent = null};
	});

	// convert the flat data into a hierarchy
	var treeData = d3.stratify()
	.id(function(d) { return d.name; })
	.parentId(function(d) { return d.parent; })
	(flatData);

	// assign the name to each node
	treeData.each(function(d) {
	d.name = d.id;
	});

	// assigns the data to a hierarchy using parent-child relationships
	var nodes = d3.hierarchy(treeData, function(d) {
	return d.children;
	});

	// maps the node data to the tree layout
	nodes = treemap(nodes);

	// 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.left + margin.right)
	.attr("height", height + margin.top + margin.bottom),
	g = svg.append("g")
	.attr("transform",
	"translate(" + margin.left + "," + margin.top + ")");

	// adds the links between the nodes
	var link = g.selectAll(".link")
	.data( nodes.descendants().slice(1))
	.enter().append("path")
	.attr("class", "link")
	.attr("d", function(d) {
	return "M" + d.y + "," + d.x
	+ "C" + (d.y + d.parent.y) / 2 + "," + d.x
	+ " " + (d.y + d.parent.y) / 2 + "," + d.parent.x
	+ " " + d.parent.y + "," + d.parent.x;
	});

	// adds each node as a group
	var node = g.selectAll(".node")
	.data(nodes.descendants())
	.enter().append("g")
	.attr("class", function(d) {
	return "node" +
	(d.children ? " node--internal" : " node--leaf"); })
	.attr("transform", function(d) {
	return "translate(" + d.y + "," + d.x + ")"; });

	// adds the circle to the node
	node.append("circle")
	.attr("r", 10);

	// adds the text to the node
	node.append("text")
	.attr("dy", ".35em")
	.attr("x", function(d) { return d.children ? -13 : 13; })
	.style("text-anchor", function(d) {
	return d.children ? "end" : "start"; })
	.text(function(d) { return d.data.name; });

	});

	</script>
	</body>
	name	parent
	Top Level	null
	Level 2: A	Top Level
	Level 2: B	Top Level
	Son of A	Level 2: A
	Daughter of A	Level 2: A