使用d3 js动态调整文本大小的矩形节点大小（节点的宽度和高度）

Question

我使用D3 js作为崩溃树。 我想根据文本大小调整节点大小（宽度和高度）。

在下图中，您可以看到矩形节点的大小随文本大小而变化

以下是我使用

的代码

请帮我解决这个问题

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.node {
		cursor: pointer;
		border-style: solid;
    border-width: 2px 10px 4px 20px;
	}

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

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

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

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<!-- load the d3.js library -->	
<script src="https://d3js.org/d3.v3.min.js"></script>
	
<script>

var treeData = [
  {
    "name": "Top Level",
    "parent": "null",
    "children": [
      {
        "name": "Level 2: A",
        "parent": "Top Level",
        "children": [
          {
            "name": "Son of A",
            "parent": "Level 2: A"
          },
          {
            "name": "Daughter of A",
            "parent": "Level 2: A"
          }
        ]
      },
      {
        "name": "Level 2: B some text some text some text some text some text",
        "parent": "Top Level"
		
      }
    ]
  }
];


// ************** 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,
	duration = 750,
	root;

var tree = d3.layout.tree()
	.size([height, width]);


var diagonal = d3.svg.diagonal()
        .source(function (d) {
            return {
                "x": d.source.x,
                "y": d.source.y + 150
            };
        })
        .projection(function (d) { return [d.y + 0, d.x + 0];
      });

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];
root.x0 = height / 2;
root.y0 = 0;
  
update(root);

d3.select(self.frameElement).style("height", "500px");

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; });

  // Update the nodes…
  var node = svg.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("g")
	  .attr("class", "node")
	  .attr("transform", function(d) { return "translate(" + source.y0 + "," + source.x0 + ")"; })
	  .on("click", click);

  nodeEnter.append("rect")
	 .attr("x", function(d) { return d.children || d._children ? 0 : 0; })
	 .attr("y", function(d) { return d.children || d._children ? 15 : 15; })
	 .attr("rx", 10)
	 .attr("ry", 10)
     .attr("width", 10)
     .attr("height", 10)
	 .style("fill", function(d) { return d._children ? "lightsteelblue" : "#fff"; });

  nodeEnter.append("text")
	  .attr("x", 60)
	  .attr("dy", ".35em")
	  .attr("text-anchor", "middle")
	  .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("rect")
	  .attr("x", function(d) { return d.children || d._children ? 0 : 0; })
	 .attr("y", function(d) { return d.children || d._children ? -15 : -15; })
	 .attr("rx", 10)
	 .attr("ry", 10)
     .attr("width", 150)
     .attr("height", 30)
	  .style("fill", function(d) { return d._children ? "lightsteelblue" : "#fff"; });

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

  // 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("rect")
	  .attr("x", function(d) { return d.children || d._children ? 0 : 0; })
	 .attr("y", function(d) { return d.children || d._children ? 15 : 15; })
	 .attr("rx", 10)
	 .attr("ry", 10)
     .attr("width", 10)
     .attr("height", 10);

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

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

  // Enter any new links at the parent's previous position.
  link.enter().insert("path", "g")
	  .attr("class", "link")
.attr("fill", "none")
.attr("stroke", "black")
	  .attr("d", function(d) {
		var o = {x: source.x0, y: source.y0};
		return diagonal({source: o, target: o});
	  });

  // 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>

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