我正在尝试绘制多个 d3js 可缩放树状图。
我成功地根据这个例子画了一个 https://codepen.io/moktc/pen/XMGgwP.当我重用绘图功能时，第一个图表显示为空白，就像需要显示数据一样。
绘图功能为
function drawTreeMap(tree) {
treemap = d3.treemap()
.tile(d3.treemapSquarify.ratio(height / width * 0.69 *(1 + Math.sqrt(5))))
.size([width, height])
.round(false)
.paddingInner(1);
var id = "#" +tree;
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");
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");
};
当我使用此函数 twite 显示第二个树状图时，其数据与第一个树状图相同。 第一个变为空白
svg、grandparent和treemap都是在函数drawTreemap()之外声明的对象(这从你发布的代码中并不明显，但可以在 CodePen 上的完整代码示例中看到)，因此调用函数两次将对相同的对象执行两次操作。由于这些对象构成树状图的一部分，因此第二个树状图需要这些对象的单独副本，因此应在drawTreemap()中声明它们。
此外，请注意，函数display()包含对祖父级的引用，该引用不会作为参数传递给display()，因此需要为每个祖父级副本单独声明两个display()副本。因此，display()也应该在drawTreemap()内部声明(请注意，Javascript 函数是闭包，即它们的定义包括对声明函数时范围内所有变量的引用，因此可以声明引用不在全局范围内的变量的函数，而无需将它们作为参数传递到函数中)。
第三，initialize()、accumulate()、layout()、treemap()和display()的函数需要为每个树状图单独调用，因此将这些调用包含在drawTreemap()中是有意义的。
因此，你应该在drawTreemap()内部本地声明svg、grandparent、treemap和display()，并包括对initialize()、accumulate()、layout()、treemap()和display()的调用，这可以按如下方式完成：
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) {
//...
}
}
下面是基于您引用的 CodePen 上的示例的完整代码：
<!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, //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 treemap;
//var svg, grandparent;
var root = d3.hierarchy(data)
.eachBefore(function (d) { d.id = (d.parent ? d.parent.id + "." : "") + d.data.shortName; })
.sum(function (d) { return d.size; }) // access the numeric attribute of the data
.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()
//.tile(d3.treemapResquarify)
.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);
// Update the domain only after entering new elements.
x.domain([d.x0, d.x0 + d.x1]);
y.domain([d.y0, d.y0 + d.y1]);
// 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) {
console.log('.depth sort a ' + a.depth + ' b ' + b.depth);
return a.depth - b.depth;
});
// Fade-in entering text.
g2.selectAll("text").style("fill-opacity", 0);
// 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);
// Remove the old node when the transition is finished.
t1.remove().on("end", function () {
svg.style("shape-rendering", "crispEdges");
transitioning = false;
});
}
return g;
}
} // end of drawTreemap()
function initialize(root) {
root.x = root.y = 0;
root.x1 = width;
root.y1 = 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) {
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;
}
// 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});
// treemap(d);
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);
//return (d.x1 -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);
//return y(d.y1 - d.y0);
});
}
function name(d) {
return d.parent
? name(d.parent) + " / " + d.data.shortName + " (" + formatNumber(d.value) + ")"
: d.data.shortName + " (" + formatNumber(d.value) + ")";
}
//$(function () { // I have commented this out because I have not included jQuery.js
updateDrillDown();
//});
</script>
</body>
</html>
编辑以说明如何一次仅显示一个图表：
一次仅显示其中一个图表(具体取决于<select>框的值)的一种方法是绘制两个图表，但使用displaystyle 属性隐藏其中一个图表。例如：
<!--Add this HTML-->
<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><!--Add this style to the second <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，每次用户更改所选图表时，都不会从头开始重绘图表。
或者，如果您希望在任何给定时间只在文档中绘制一个图表，并且每次用户更改所选图表时都绘制图表，则可以直接从对<select>框的更改触发updateDrillDown()，并在updateDrillDown()中包含在绘制新图表之前清除旧图表的代码：
<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>
和
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，则还应在drawTreemap()中包含用于创建root的代码，并在treeId上添加一个条件，以确定要使用的数据。