我想我在这里错过了一些非常明显的东西。基本上我要做的是创建一个树形图，按钮点击将转到服务器并检索下一级到树图...这是必要的，因为树图结构太大，需要太长时间来计算所以跳一个一次一级是我们唯一的选择。
[注意IE用户，在此示例中，树形图节点名称似乎不起作用。尝试使用Chrome]
此代码几乎完全取自
http://bost.ocks.org/mike/treemap/
我正在使用vizData1.json作为“第一”级别，并且在鼠标单击时我使用vizData2.json作为“第二”级别。你可以看到两者最终重叠。我试过svg.exit（）以及svg.clear（）没有任何运气。
我还应该注意，我已经尝试过这篇文章中的粘性（错误）建议
Does the d3 treemap layout get cached when a root node is passed to it?
更新： 为了继续寻找，我找到了一个成功地将新节点添加到现有树形图的示例。但是我无法适应这种逻辑，因为我尝试适应这种逻辑的树形图已被Michael Bostock大量定制 - @mbostock以允许顶部的漂亮的痕迹路径条。
可以证明附加到现有树形图节点的代码片段： http://jsfiddle.net/WB5jh/3/
另外，Stackoverflow强迫我发布代码，因为我正在链接到plnkr所以我把我的script.js转储给那些不想与plunker交互的人
$(function() {
var margin = { top: 20, right: 0, bottom: 0, left: 0 },
width = 960,
height = 500,
formatNumber = d3.format(",d"),
transitioning;
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)
.sticky(false);
var svg = d3.select("#treemap")
.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");
d3.json("vizData1.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.
// We also take a snapshot of the original children (_children) to avoid
// the children being overwritten when when layout is computed.
function accumulate(d) {
return (d._children = 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);
});
}
}
function display(d) {
console.log(d);
grandparent
.datum(d.parent)
.on("click", transition)
.select("text")
.text(name(d));
var g1 = svg.insert("g", ".grandparent")
.datum(d)
.attr("class", "depth");
var g = g1.selectAll("g")
.data(d._children)
.enter().append("g");
g.filter(function (d) { return d._children; })
.classed("children", true)
.on("click", transition);
g.selectAll(".child")
.data(function (d) { return d._children || [d]; })
.enter().append("rect")
.attr("class", "child")
.call(rect);
g.append("rect")
.attr("class", "parent")
.call(rect)
.append("title")
.text(function (d) { return formatNumber(d.value); });
g.append("foreignObject")
.call(rect)
.attr("class", "foreignobj")
.append("xhtml:div")
.attr("dy", ".75em")
.html(function (d) { return d.name; })
.attr("class", "textdiv");
function transition(d) {
if (transitioning || !d) return;
transitioning = true;
d3.json("vizData2.json", function (root) {
initialize(root);
accumulate(root);
layout(root);
display(root);
});
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);
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;
});
}
return g;
}
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;
}
});