Question

我想直接在变量中读取json数据，例如

var HEBdata = [
{"name":"test.cluster1.item1","imports":["test.cluster1.item2","test.cluster1.item3"]},
{"name":"test.cluster1.item2","imports":["test.cluster1.item3"]},
{"name":"test.cluster1.item3"}
];

然后我会在这里使用这个变量

d3.json(HEBdata, function(error, classes) {
  if (error) throw error;

而不是

d3.json("https://gist.githubusercontent.com/mbostock/1044242/raw/8f22cf2264e1f6ec6cb233c4b49333fb8f75bb99/readme-flare-imports.json", function(error, classes) {
  if (error) throw error;

以下是您可能更改的代码：https://fiddle.jshell.net/d1766z4r/（URL已被注释并被HEBdata变量替换）

我想这样做是为了能够使用自定义数据来简化我稍后要问的其他问题。

Answer 1

请勿使用d3.json。而只是将对象分配给var classes。

d3.json基本上是这样做的：

使用XMLHttpRequest或XHR将数据加载到浏览器中。这允许数据异步加载（因此页面的其余部分可以在加载数据时显示），并且比JSONP更安全。 D3的xhr模块简化了加载和解析数据的过程。在异步加载数据时，依赖于加载数据的代码通常应存在于回调函数中。页面加载时，可以立即运行不依赖于数据的代码。

https://github.com/d3/d3-3.x-api-reference/blob/master/Requests.md

由于您已准备好数据，因此无需等待即可使用。因此，任何通常必须等待运行直到收到Http响应的代码才能立即运行：

var classes = [
{"name":"test.cluster1.item1","imports":["test.cluster1.item2","test.cluster1.item3"]},
{"name":"test.cluster1.item2","imports":["test.cluster1.item3"]},
{"name":"test.cluster1.item3"}
];

var diameter = 960,
    radius = diameter / 2,
    innerRadius = radius - 120;

var cluster = d3.layout.cluster()
    .size([360, innerRadius])
    .sort(null)
    .value(function(d) { return d.size; });

var bundle = d3.layout.bundle();

var line = d3.svg.line.radial()
    .interpolate("bundle")
    .tension(.85)
    .radius(function(d) { return d.y; })
    .angle(function(d) { return d.x / 180 * Math.PI; });

var svg = d3.select("body").append("svg")
    .attr("width", diameter)
    .attr("height", diameter)
  .append("g")
    .attr("transform", "translate(" + radius + "," + radius + ")");

var link = svg.append("g").selectAll(".link"),
    node = svg.append("g").selectAll(".node");

//d3.json("https://gist.githubusercontent.com/mbostock/1044242/raw/8f22cf2264e1f6ec6cb233c4b49333fb8f75bb99/readme-flare-imports.json", function(error, classes) {
  //if (error) throw error;

  var nodes = cluster.nodes(packageHierarchy(classes)),
      links = packageImports(nodes);

  link = link
      .data(bundle(links))
    .enter().append("path")
      .each(function(d) { d.source = d[0], d.target = d[d.length - 1]; })
      .attr("class", "link")
      .attr("d", line);

  node = node
      .data(nodes.filter(function(n) { return !n.children; }))
    .enter().append("text")
      .attr("class", "node")
      .attr("dy", ".31em")
      .attr("transform", function(d) { return "rotate(" + (d.x - 90) + ")translate(" + (d.y + 8) + ",0)" + (d.x < 180 ? "" : "rotate(180)"); })
      .style("text-anchor", function(d) { return d.x < 180 ? "start" : "end"; })
      .text(function(d) { return d.key; })
      .on("mouseover", mouseovered)
      .on("mouseout", mouseouted);
//});

function mouseovered(d) {
  node
      .each(function(n) { n.target = n.source = false; });

  link
      .classed("link--target", function(l) { if (l.target === d) return l.source.source = true; })
      .classed("link--source", function(l) { if (l.source === d) return l.target.target = true; })
    .filter(function(l) { return l.target === d || l.source === d; })
      .each(function() { this.parentNode.appendChild(this); });

  node
      .classed("node--target", function(n) { return n.target; })
      .classed("node--source", function(n) { return n.source; });
}

function mouseouted(d) {
  link
      .classed("link--target", false)
      .classed("link--source", false);

  node
      .classed("node--target", false)
      .classed("node--source", false);
}

d3.select(self.frameElement).style("height", diameter + "px");

// Lazily construct the package hierarchy from class names.
function packageHierarchy(classes) {
  var map = {};

  function find(name, data) {
    var node = map[name], i;
    if (!node) {
      node = map[name] = data || {name: name, children: []};
      if (name.length) {
        node.parent = find(name.substring(0, i = name.lastIndexOf(".")));
        node.parent.children.push(node);
        node.key = name.substring(i + 1);
      }
    }
    return node;
  }

  classes.forEach(function(d) {
    find(d.name, d);
  });

  return map[""];
}

// Return a list of imports for the given array of nodes.
function packageImports(nodes) {
  var map = {},
      imports = [];

  // Compute a map from name to node.
  nodes.forEach(function(d) {
    map[d.name] = d;
  });

  // For each import, construct a link from the source to target node.
  nodes.forEach(function(d) {
    if (d.imports) d.imports.forEach(function(i) {
      imports.push({source: map[d.name], target: map[i]});
    });
  });

  return imports;
}

.node {
  font: 300 11px "Helvetica Neue", Helvetica, Arial, sans-serif;
  fill: #bbb;
}

.node:hover {
  fill: #000;
}

.link {
  stroke: steelblue;
  stroke-opacity: .4;
  fill: none;

<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.4.11/d3.min.js"></script>

小提琴：https://fiddle.jshell.net/ga1s8bn7/

d3.js层次化边缘捆绑：在变量中嵌入json数据

1 个答案: