svg
、grandparent
和treemap
都是在函数drawTreemap()
之外声明的对象(这在您发布的代码中并不明显,但可以在CodePen的完整代码示例中看到),因此调用两次该函数将会对同一对象进行两次操作。由于这些对象是树状图的一部分,所以第二个树状图需要这些对象的单独副本,因此它们应该在drawTreemap()
内部声明。
此外,请注意函数display()
包含对grandparent
的引用,而这不作为参数传递给display()
,因此需要为每个grandparent
的副本分别声明两个display()
的副本。因此,display()
也应在drawTreemap()
内部声明(请注意JavaScript函数是闭包,即它们的定义包括对函数声明时存在范围内的所有变量的引用,因此可以声明引用不在全局范围内的变量的函数而不将它们作为参数传递到函数中)。
第三,每个树状图都需要单独调用函数initialize()
、accumulate()
、layout()
、treemap()
和display()
,因此将这些调用包含在drawTreemap()
中是有意义的。
因此,您应该在drawTreemap()
内部局部声明svg
、grandparent
、treemap
和display()
,并包括对initialize()
、accumulate()
、layout()
、treemap()
和display()
的调用,如下所示:
function drawTreemap(treeId) {
var id = "#" + treeId;
var svg = d3.select(id).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");
var treemap = d3.treemap()
//.tile(d3.treemapResquarify)
.size([width, height])
.round(false)
.paddingInner(1);
initialize(root);
accumulate(root);
layout(root);
treemap(root);
display(root);
function display(d) {
//...
}
}
这是完整的代码,基于你提到的 CodePen 示例:
<!DOCTYPE html>
<html>
<head>
<title></title>
<meta charset="utf-8" />
<style>
text {
pointer-events: none;
}
.grandparent text {
font-weight: bold;
}
rect {
fill: none;
stroke: #fff;
}
rect.parent,
.grandparent rect {
stroke-width: 2px;
}
.grandparent rect {
fill: orange;
}
.grandparent:hover rect {
fill: #ee9700;
}
.children rect.parent,
.grandparent rect {
cursor: pointer;
}
.children rect.parent {
fill: #bbb;
fill-opacity: .5;
}
.children:hover rect.child {
fill: #bbb;
}
</style>
</head>
<body>
<p id="chart">
Sample zoomable treemap
</p>
<div id="tree1"></div>
<div id="tree2"></div>
<script src="js/d3.v4.js"></script>
<script>
var data = {
"name": 'Sample',
"shortName": 'Sample',
"children": [
{
"name": "6.1 Identify and plan learning needs",
"shortName": "AITSL-A61",
"size": null,
"children": [
{
"name": "Analyse the Standards for.",
"shortName": "AITSL-A61-H",
"size": 59,
"children": [
]
},
{
"name": "Demonstrate an of the role of the",
"shortName": "AITSL-A61-G",
"size": 448,
"children": [
]
},
{
"name": "Use knowledge of the Standards for ",
"shortName": "AITSL-A61-L",
"size": 59,
"children": [
]
},
{
"name": "Use the plan learning needs.",
"shortName": "AITSL-A61-P",
"size": 101,
"children": [
]
}
]
},
{
"name": "6.2 Engage in improve practice",
"shortName": "AITSL-A62",
"size": null,
"children": [
{
"name": "Participate in to update knowledge .",
"shortName": "AITSL-A62-P",
"size": 92,
"children": [
]
},
{
"name": "Understand appropriate sources of .",
"shortName": "AITSL-A62-G",
"size": 405,
"children": [
]
},
{
"name": "Plan for and critiquing ",
"shortName": "AITSL-A62-H",
"size": 49,
"children": [
]
},
{
"name": "Initiate to expand opportunities.",
"shortName": "AITSL-A62-L",
"size": 47,
"children": [
]
}
]
},
{
"name": "6.3 Engage with and improve practice",
"shortName": "AITSL-A63",
"size": null,
"children": [
{
"name": "Contribute to collegial and apply.",
"shortName": "AITSL-A63-P",
"size": 84,
"children": [
]
},
{
"name": "Initiate and engage in discussions.",
"shortName": "AITSL-A63-H",
"size": 51,
"children": [
]
},
{
"name": "Seek and feedback from .",
"shortName": "AITSL-A63-G",
"size": 458,
"children": [
]
},
{
"name": "Implement dialogue within by .",
"shortName": "AITSL-A63-L",
"size": 40,
"children": [
]
}
]
},
{
"name": "6.4 Apply improve learning",
"shortName": "AITSL-A64",
"size": null,
"children": [
{
"name": "Undertake .",
"shortName": "AITSL-A64-P",
"size": 76,
"children": [
]
},
{
"name": "Demonstrate an of the rationale.",
"shortName": "AITSL-A64-G",
"size": 426,
"children": [
]
},
{
"name": "Engage with to evaluate the .",
"shortName": "AITSL-A64-H",
"size": 54,
"children": [
]
},
{
"name": "Advocate, in and lead high-quality .",
"shortName": "AITSL-A64-L",
"size": 43,
"children": [
]
}
]
}
]
};
var margin = { top: 20, right: 0, bottom: 0, left: 0 },
width = 640,
height = 530,
formatNumber = d3.format(",d"),
transitioning;
var x = d3.scaleLinear()
.domain([0, width])
.range([0, width]);
var y = d3.scaleLinear()
.domain([0, height - margin.top - margin.bottom])
.range([0, height - margin.top - margin.bottom]);
var color = d3.scaleOrdinal()
.range(d3.schemeCategory10
.map(function (c) { c = d3.rgb(c); c.opacity = 0.6; return c; }));
var fader = function (color) { return d3.interpolateRgb(color, "#fff")(0.2); };
var format = d3.format(",d");
var root = d3.hierarchy(data)
.eachBefore(function (d) { d.id = (d.parent ? d.parent.id + "." : "") + d.data.shortName; })
.sum(function (d) { return d.size; })
.sort(function (a, b) {
console.log('initial root sort a ' + a.value + ' b ' + b.value);
return b.height - a.height || b.value - a.value;
});
function updateDrillDown() {
drawTreemap("tree1");
drawTreemap("tree2");
};
function drawTreemap(treeId) {
var id = "#" + treeId;
var svg = d3.select(id).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");
var treemap = d3.treemap()
.size([width, height])
.round(false)
.paddingInner(1);
initialize(root);
accumulate(root);
layout(root);
treemap(root);
display(root);
function display(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);
var children = g.selectAll(".child")
.data(function (d) { return d._children || [d]; })
.enter().append("g");
children.append("rect")
.attr("class", "child")
.call(rect)
.append("title")
.text(function (d) { return d.data.shortName + " (" + formatNumber(d.value) + ")"; });
children.append("text")
.attr("class", "ctext")
.text(function (d) { return d.data.shortName; })
.call(text2);
g.append("rect")
.attr("class", "parent")
.call(rect);
var t = g.append("text")
.attr("class", "ptext")
.attr("dy", ".75em")
t.append("tspan")
.text(function (d) { return d.data.shortName; });
t.append("tspan")
.attr("dy", "1.0em")
.text(function (d) { return formatNumber(d.value); });
t.call(text);
g.selectAll("rect")
.style("fill", function (d) { return color(d.data.shortName); });
function transition(d) {
if (transitioning || !d) return;
transitioning = true;
var g2 = display(d),
t1 = g1.transition().duration(750),
t2 = g2.transition().duration(750);
x.domain([d.x0, d.x0 + d.x1]);
y.domain([d.y0, d.y0 + d.y1]);
svg.style("shape-rendering", null);
svg.selectAll(".depth").sort(function (a, b) {
console.log('.depth sort a ' + a.depth + ' b ' + b.depth);
return a.depth - b.depth;
});
g2.selectAll("text").style("fill-opacity", 0);
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.remove().on("end", function () {
svg.style("shape-rendering", "crispEdges");
transitioning = false;
});
}
return g;
}
}
function initialize(root) {
root.x = root.y = 0;
root.x1 = width;
root.y1 = height;
root.depth = 0;
}
function accumulate(d) {
console.log('accumulate called ' + d.data.name);
return (d._children = d.children)
? d.value = d.children.reduce(function (p, v) { return p + accumulate(v); }, 0)
: d.value;
}
function layout(d) {
if (d._children) {
d._children.forEach(function (c) {
c.x0 = d.x0 + c.x0 * d.x1;
c.y0 = d.y0 + c.y0 * d.y1;
c.x1 *= d.x1;
c.y1 *= d.y1;
c.parent = d;
layout(c);
});
}
}
function text(text) {
text.selectAll("tspan")
.attr("x", function (d) { return x(d.x0) + 6; })
text.attr("x", function (d) { return x(d.x0) + 6; })
.attr("y", function (d) { return y(d.y0) + 10; })
.style("opacity", function (d) {
console.log("text opacity setting textlength " + this.getComputedTextLength() + " d size " + (x(d.x0 + d.x1) - x(d.x0)));
return this.getComputedTextLength() < x(d.x0 + d.x1) - x(d.x0) ? 1 : 0;
});
}
function text2(text) {
text.attr("x", function (d) { return x(d.x0 + d.x1) - this.getComputedTextLength() - 6; })
.attr("y", function (d) { return y(d.y0 + d.y1) - 6; })
.style("opacity", function (d) { return this.getComputedTextLength() < x(d.x0 + d.x1) - x(d.x0) ? 1 : 0; });
}
function rect(rect) {
rect.attr("x", function (d) { return x(d.x0); })
.attr("y", function (d) { return y(d.y0); })
.attr("width", function (d) {
console.log('id ' + d.id + ' rect width ' + (d.x1 - d.x0));
return x(d.x0 + d.x1) - x(d.x0);
})
.attr("height", function (d) {
console.log('id ' + d.id + ' rect height ' + (d.y1 - d.y0) + ' ordinal ' + (y(d.y1 + d.y0) - y(d.y0)));
return y(d.y0 + d.y1) - y(d.y0);
});
}
function name(d) {
return d.parent
? name(d.parent) + " / " + d.data.shortName + " (" + formatNumber(d.value) + ")"
: d.data.shortName + " (" + formatNumber(d.value) + ")";
}
updateDrillDown();
</script>
</body>
</html>
编辑以解释如何一次只显示一个图表:
一种在<select>
框的值上根据需要仅显示其中一个图表的方法是绘制两个图表,但使用display
样式属性隐藏其中一个。例如:
<select id="chart_selector" onchange="toggleChartVisibility();">
<option value="1" selected="selected">Chart 1</option>
<option value="2">Chart 2</option>
</select>
<br />
<div id="tree1"></div>
<div id="tree2" style="display:none;"></div>
<script>
function toggleChartVisibility() {
var chosen = document.getElementById("chart_selector").value;
if (chosen == "1") {
document.getElementById("tree1").style.display = "block";
document.getElementById("tree2").style.display = "none";
} else {
document.getElementById("tree1").style.display = "none";
document.getElementById("tree2").style.display = "block";
}
}
</script>
使用display
隐藏其中一个图表的优点是,每次用户更改所选的图表时,图表不会从头开始重绘。
或者,如果您希望在文档中每次只绘制一个图表,并且在用户更改所选的图表时每次都绘制图表,那么可以通过直接从<select>
框的更改触发updateDrillDown()
并在updateDrillDown()
中包含代码来清除旧图表以绘制新图表:
<select id="chart_selector" onchange="updateDrillDown();">
<option value="1" selected="selected">Chart 1</option>
<option value="2">Chart 2</option>
</select>
<br />
<div id="tree1"></div>
<div id="tree2"></div>
并且
function updateDrillDown() {
var chosen = document.getElementById("chart_selector").value;
if (chosen == "1") {
document.getElementById("tree2").innerHTML = "";
drawTreemap("tree1");
} else {
document.getElementById("tree1").innerHTML = "";
drawTreemap("tree2");
}
};
如果每个图表都有不同的数据,您还应该在
drawTreemap()
内包含创建
root
的代码,并添加一个条件来确定使用哪些数据的
treeId
。