我正在尝试复制以下D3可缩放树形图，以便更好地理解D3的工作原理：
https://secure.polisci.ohio-state.edu/faq/d3/zoomabletreemap.htm
TL; DR：我只看到JSON对象的前两个孩子，而不是孙子等等。当我单击其中一个子项时，我的浏览器中会打开一个空的HTML文档（而不是“http://polisci.osu.edu/”，这是您单击原始Ohio State树形图中的叶节点时获得的内容）。
我的调试尝试： 在我的控制台中，作为测试，我将'zoomabletreemap.json'中的JSON值存储为名为'treemap'的变量，我可以访问'treemap.children [0] .children'等属性。但是当我尝试通过在我的脚本中添加console.log语句来输出这些相同的子项时，我得到'undefined'。例如，在我的脚本代码中标记为：
/* write children rectangles */
我添加了以下console.log语句：
g.selectAll(".child")
.data(function(d) {
console.log(d);
console.log(d.children);
return d.children || [d];
})
以下是输出：
Object {name: "International Relations", value: 42257, depth: 1, parent: Object, area: 0.6293113718949187…}
area: 0.6293113718949187
depth: 1
dx: 620
dy: 302.06945850956095
name: "International Relations"
parent: Object
value: 42257
x: 0
y: 0
z: true
__proto__: Object
undefined
Object {name: "Political Methodology", value: 24891, depth: 1, parent: Object, area: 0.37068862810508135…}
area: 0.37068862810508135
depth: 1
dx: 620
dy: 177.93054149043905
name: "Political Methodology"
parent: Object
value: 24891
x: 0
y: 302.06945850956095
z: false
__proto__: Object
undefined
显然，前两个子节点（“国际关系”和“政治方法论”）正在以某种方式被覆盖，即删除所有子节点的“children”属性。我通过http://prettydiff.com将我的代码与原始源代码进行了比较，以检查代码差异，并且我没有看到任何明显的差异。谁能告诉我我做错了什么？
这是一个我希望工作的JS小提琴，但不是：
我的HTML和JS脚本紧接着在下面：
<!DOCTYPE html>
<meta charset="utf-8">
<title>Zoomable Treemap</title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
<script type="text/javascript" src="../d3.v3/d3.v3.js"></script>
<link rel="stylesheet" href="example.css">
<p id="chart">
<script>
var margin = {top: 20, right: 0, bottom: 0, left: 0},
width = 620,
height = 500 - margin.top - margin.bottom,
formatNumber = d3.format(",d"),
transitioning;
/* create x and y scales */
var x = d3.scale.linear()
.domain([0, width])
.range([0, width]);
var y = d3.scale.linear()
.domain([0, height])
.range([0, height]);
var treemap = d3.layout.treemap()
.children(function(d, depth) {
return depth ? null : d.children;
})
.sort(function(a, b) { return a.value - b.value; })
.ratio(height / width * 0.5 * (1 + Math.sqrt(5)))
.round(false);
/* create svg */
var svg = d3.select("#chart").append("svg")
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.bottom + margin.top)
.style("margin-left", -margin.left + "px")
.style("margin.right", -margin.right + "px")
.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")")
.style("shape-rendering", "crispEdges");
var grandparent = svg.append("g")
.attr("class", "grandparent");
grandparent.append("rect")
.attr("y", -margin.top)
.attr("width", width)
.attr("height", margin.top);
grandparent.append("text")
.attr("x", 6)
.attr("y", 6 - margin.top)
.attr("dy", ".75em");
/* load in data, display root */
d3.json("zoomabletreemap.json", function(root) {
initialize(root);
accumulate(root);
layout(root);
display(root);
function initialize(root) {
root.x = root.y = 0;
root.dx = width;
root.dy = height;
root.depth = 0;
}
// Aggregate the values for internal nodes. This is normally done by the
// treemap layout, but not here because of our custom implementation.
function accumulate(d) {
return d.children
? d.value = d.children.reduce(function(p, v) { return p + accumulate(v); }, 0)
: d.value;
}
// Compute the treemap layout recursively such that each group of siblings
// uses the same size (1×1) rather than the dimensions of the parent cell.
// This optimizes the layout for the current zoom state. Note that a wrapper
// object is created for the parent node for each group of siblings so that
// the parent’s dimensions are not discarded as we recurse. Since each group
// of sibling was laid out in 1×1, we must rescale to fit using absolute
// coordinates. This lets us use a viewport to zoom.
function layout(d) {
if (d.children) {
treemap.nodes({children: d.children});
d.children.forEach(function(c) {
c.x = d.x + c.x * d.dx;
c.y = d.y + c.y * d.dy;
c.dx *= d.dx;
c.dy *= d.dy;
c.parent = d;
layout(c);
});
}
}
/* display show the treemap and writes the embedded transition function */
function display(d) {
/* create grandparent bar at top */
grandparent
.datum(d.parent)
.on("click", transition)
.select("text")
.text(name(d));
var g1 = svg.insert("g", ".grandparent")
.datum(d)
.attr("class", "depth");
/* add in data */
var g = g1.selectAll("g")
.data(d.children)
.enter().append("g");
/* transition on child click */
g.filter(function(d) { return d.children; })
.classed("children", true)
.on("click", transition);
/* write children rectangles */
g.selectAll(".child")
.data(function(d) {
return d.children || [d];
})
.enter().append("rect")
.attr("class", "child")
.call(rect);
/* write parent rectangle */
g.append("rect")
.attr("class", "parent")
.call(rect)
/* open new window based on the json's URL value for leaf nodes */
/* Chrome displays this on top */
.on("click", function(d) {
if(!d.children){
window.open(d.url);
}
})
.append("title")
.text(function(d) { return formatNumber(d.value); });
/* Adding a foreign object instead of a text object, allows for text wrapping */
g.append("foreignObject")
.call(rect)
/* open new window based on the json's URL value for leaf nodes */
/* Firefox displays this on top */
.on("click", function(d) {
if(!d.children){
window.open(d.url);
}
})
.attr("class","foreignobj")
.append("xhtml:div")
.attr("dy", ".75em")
.html(function(d) { return d.name; })
.attr("class","textdiv"); //textdiv class allows us to style the text easily with CSS
/* create transition function for transitions */
function transition(d) {
if (transitioning || !d) return;
transitioning = true;
var g2 = display(d),
t1 = g1.transition().duration(750),
t2 = g2.transition().duration(750);
// Update the domain only after entering new elements.
x.domain([d.x, d.x + d.dx]);
y.domain([d.y, d.y + d.dy]);
// Enable anti-aliasing during the transition.
svg.style("shape-rendering", null);
// Draw child nodes on top of parent nodes.
svg.selectAll(".depth").sort(function(a, b) { return a.depth - b.depth; });
// Fade-in entering text.
g2.selectAll("text").style("fill-opacity", 0);
g2.selectAll("foreignObject div").style("display", "none"); /*added*/
// Transition to the new view.
t1.selectAll("text").call(text).style("fill-opacity", 0);
t2.selectAll("text").call(text).style("fill-opacity", 1);
t1.selectAll("rect").call(rect);
t2.selectAll("rect").call(rect);
t1.selectAll(".textdiv").style("display", "none"); /* added */
t1.selectAll(".foreignobj").call(foreign); /* added */
t2.selectAll(".textdiv").style("display", "block"); /* added */
t2.selectAll(".foreignobj").call(foreign); /* added */
// Remove the old node when the transition is finished.
t1.remove().each("end", function() {
svg.style("shape-rendering", "crispEdges");
transitioning = false;
});
}//endfunc transition
return g;
}//endfunc display
function text(text) {
text.attr("x", function(d) { return x(d.x) + 6; })
.attr("y", function(d) { return y(d.y) + 6; });
}
function rect(rect) {
rect.attr("x", function(d) { return x(d.x); })
.attr("y", function(d) { return y(d.y); })
.attr("width", function(d) { return x(d.x + d.dx) - x(d.x); })
.attr("height", function(d) { return y(d.y + d.dy) - y(d.y); });
}
function foreign(foreign){ /* added */
foreign.attr("x", function(d) { return x(d.x); })
.attr("y", function(d) { return y(d.y); })
.attr("width", function(d) { return x(d.x + d.dx) - x(d.x); })
.attr("height", function(d) { return y(d.y + d.dy) - y(d.y); });
}
function name(d) {
return d.parent ? name(d.parent) + "." + d.name : d.name;
}
});
</script>
我的代码引用了文件'zoomabletreemap.json'，其中包含以下代码：
{
"name": "Sitemap",
"children": [
{
"name": "International Relations",
"children": [
{
"name": "Systemic Theory",
"children": [
{"name": "Great Powers", "value": 3938, "url": "http://polisci.osu.edu"},
{"name": "Systemic Politics", "value": 743, "url": "http://polisci.osu.edu"}
]
},
{
"name": "International Conflict",
"children": [
{"name": "Systemic Politics", "value": 3416, "url": "http://google.com"},
{"name": "Causal Complexity", "value": 3416, "url": "http://bing.com"},
{"name": "Deadly Doves", "value": 3416, "url": "http://polisci.osu.edu"},
{"name": "Politcal Irrelevance", "value": 3416, "url": "http://polisci.osu.edu"},
{"name": "The Fog of Peace: Uncertainty, War, and the Resumption of International Crises, <i>manuscript</i>", "value": 3416, "url": "http://polisci.osu.edu"},
{"name": "Greed or Opportunity? Refining our Understanding of the Origins of Civil Wars, <i>manuscript</i>", "value": 3416, "url": "http://polisci.osu.edu"}
]
},
{
"name": "Foreign Policy",
"children": [
{"name": "The Myth of American Isolationism", "value": 3416, "url": "http://polisci.osu.edu"}
]
},
{
"name": "Courses",
"children": [
{"name": "IS 201", "value": 3416, "url": "http://polisci.osu.edu"},
{"name": "PS 544", "value": 3416, "url": "http://polisci.osu.edu"},
{"name": "PS 848", "value": 3416, "url": "http://polisci.osu.edu"}
]
},
{
"name": "Dataverse",
"children": [
{"name": "Dataverse", "value": 3416, "url": "http://polisci.osu.edu"}
]
}
]
},
{
"name": "Political Methodology",
"children": [
{
"name": "Theory and Methdology",
"children": [
{"name": "Interactions and Causal Complexity", "value": 3938, "url": "http://polisci.osu.edu"},
{"name": "Theory and Methodology", "value": 743, "url": "http://polisci.osu.edu"},
{"name": "Software", "value": 743, "url": "http://polisci.osu.edu"},
{"name": "Courses", "value": 743, "url": "http://polisci.osu.edu"}
]
},
{
"name": "Insteractions and Causal Cmplexity",
"children": [
{"name": "Hypothesis Testing and Multiplicative Interation Terms", "value": 3938, "url": "http://polisci.osu.edu"},
{
"name": "Causal Complexity",
"children": [
{"name": "Causal Complexity and the Study of Politics", "value": 3938, "url": "http://polisci.osu.edu"},
{"name": "Political Irrelevance", "value": 743, "url": "http://polisci.osu.edu"},
{"name": "boolean3 package for R", "value": 743, "url": "http://polisci.osu.edu"}
]
}
]
},
{
"name": "Software",
"children": [
{"name": "boolean3 package for R", "value": 3938, "url": "http://polisci.osu.edu"}
]
},
{
"name": "Courses",
"children": [
{"name": "PS 4781", "value": 3938, "url": "http://polisci.osu.edu"},
{"name": "PS 867", "value": 743, "url": "http://polisci.osu.edu"},
{"name": "PS 846", "value": 743, "url": "http://polisci.osu.edu"}
]
}
]
}
]
}
答案 0 :(得分：0)
最后，我从最新版本的D3.js切换到版本2.所以我从D3网站上获取了代码：
<script src="http://d3js.org/d3.v3.min.js" charset="utf-8"></script>
...并将其改为：
<script src="http://d3js.org/d3.v2.min.js" charset="utf-8"></script>
效果很好！
答案 1 :(得分：0)
遇到同样的问题，但找到了一个解决方案：http://bost.ocks.org/mike/treemap/
http://jsfiddle.net/sreebabu/65ypcpg9/
将“儿童”改为“_children”
前：
function accumulate(d) {
return (d._children = d.children)
? d.value = d.children.reduce(function(p, v) { return p + accumulate(v); }, 0)
: d.value;
}
var g = g1.selectAll("g")
.data(d._children) // from d.children to d._children
.enter().append("g");