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如何获得d3.js树布局按字母顺序排序节点?

[英]How to get d3.js tree layout to sort nodes alphabetically?

我正在试验这个 d3.js的例子(完整地粘贴在下面)来绘制一个基于JSON树结构的树。

此代码绘制了一个漂亮的树,但它不会以任何顺序垂直排序兄弟节点。 数据恰好已经在底层JSON对象中排序。

我想知道如果底层数据尚未排序,我可以如何以字母顺序垂直排序这些节点(顶部为A,底部为Z,理想情况下不区分大小写)。 我需要在下面的代码中更改什么?

开始编辑:

我想这样做而不修改底层的JSON对象。 我试过的一件事是添加tree.sort(d3.ascending); 就在d3.layout.tree()行之后。 但那没有任何效果。 我不知道为什么。

结束编辑

<!DOCTYPE html>
    <meta charset="utf-8">
    <style>

    .node {
      cursor: pointer;
    }

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

    .node text {
      font: 10px sans-serif;
    }

    .link {
      fill: none;
      stroke: #ccc;
      stroke-width: 1.5px;
    }

    </style>
    <body>
    <script src="//d3js.org/d3.v3.min.js"></script>
    <script>

    var margin = {top: 20, right: 120, bottom: 20, left: 120},
        width = 960 - margin.right - margin.left,
        height = 800 - margin.top - margin.bottom;

    var i = 0,
        duration = 750,
        root;

    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 + ")");

    d3.json("/mbostock/raw/4063550/flare.json", function(error, flare) {
      if (error) throw error;

      root = flare;
      root.x0 = height / 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);
    });

    d3.select(self.frameElement).style("height", "800px");

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

      nodeEnter.append("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 = 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("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>

而不是这个:

tree.sort(d3.ascending)

像这样做:

var tree = d3.layout.tree()
    .size([height, width]).sort(function(a,b){
      return a.name.toLowerCase().localeCompare(b.name.toLowerCase());
    });;

在这里工作代码

如果你的flare.json与示例类似,你可以使用js sort函数来处理它。

if (error) throw error;

flare.children.sort(function(a, b){
    if(a.name < b.name) return -1;
    if(a.name > b.name) return 1;
    return 0;
});

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