基于D3.js的树图连线信息展示方案（带路径的文字展示方案）

最近由于项目需要，需要在树图上展示一些节点之间的调用信息，后来在网上找了一些方案，相关的例子几乎没有。
现在将效果图以及代码展示如下（具体的关键性部分已经注释）：
<!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>

var data = [
    { "name" : "csdn.blog.world.python", "parent":"csdn.blog.world" },
    { "name" : "csdn.blog.world", "parent":"null" },
    { "name" : "csdn.blog.world.python_a", "parent":"csdn.blog.world.python" },
    { "name" : "csdn.blog.world.python_b", "parent":"csdn.blog.world.python" },
    { "name" : "csdn.blog.world.python_c", "parent":"csdn.blog.world.python" },
    { "name" : "csdn.blog.world.golang", "parent":"csdn.blog.world" },
    { "name" : "csdn.blog.world.c", "parent":"csdn.blog.world" },
    { "name" : "csdn.blog.world.java", "parent":"csdn.blog.world" }
    ];

// *********** 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);
	}
});

// ************** 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 + ")");

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 linkEnter = svg.selectAll("path.link").append("g")
        .data(links, function(d) { return d.target.id; });

  linkEnter.enter().insert("path", "g")//在指定元素之前插入一个元素
	  .attr("class", "link")
	  .attr("d", diagonal)
    // 首先为每条节点连线添加标识id
    .attr("id", function(d, i){
      return "mypath" + i;
    });

  //为连线添加文字
  linkEnter.enter().append('text')
          .attr('x', 90)
          .attr('y', 20)
          .style('fill', 'green')
          .style('font-size', '10px')
          .style('font-weight', 'bold')
          .append('textPath')
          .attr({//引用路径
              'xlink:href': function(d, i){
                return "#mypath" + i;
              }
          })
          .text(function (d, i) {
            return i + '_Service.Pay()'
          });
}
</script>
  </body>
</html>
基于D3.js的树图连线信息展示方案（带路径的文字展示方案）

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