我想用D3.js v4创建一个多线图。我正在使用这个例子:https://bl.ocks.org/mbostock/3884955。
示例csv数据:
storageSystem,poolId,availableVolumeCapacity,date
system01,0,18031398,20170413
system01,1,15626268,20170413
system01,2,61256286,20170413
system01,3,119514990,20170413
system02,0,15046668,20170413
system02,1,12486558,20170413
system02,2,12303396,20170413
system03,0,35171335,20170413
system03,1,17263722,20170413
system01,0,18031387,20170414
system01,1,15626257,20170414
system01,2,61256275,20170414
system01,3,119514989,20170414
system02,0,15046657,20170414
system02,1,12486547,20170414
system02,2,12303385,20170414
system03,0,35171324,20170414
system03,1,17263711,20170414
数据对象:
0: Object
color: "#8c564b"
key: "system03"
values: Array(2)
0: Object
key: "0"
values: Array(23)
0: Object
availableVolumeCapacity: 35171335
date: Thu Apr 13 2017 00:00:00 GMT+0000 (Coordinated Universal Time)
poolId: "0"
storageSystem: "system03"
1: Object
key: "1"
values: Array(23)
0: Object
availableVolumeCapacity: 17263722
date: Thu Apr 13 2017 00:00:00 GMT+0000 (Coordinated Universal Time)
poolId:"1"
storageSystem: "system03"
D3.js代码:
var svg = d3.select("svg")
m = {top: 20, right: 20, bottom: 50, left: 20},
w = svg.attr("width") - m.left - m.right,
h = svg.attr("height") - m.top - m.bottom,
g = svg.append("g").attr("transform", "translate(" + m.left + "," + m.top + ")");
var parseTime = d3.timeParse("%Y%m%d");
var x = d3.scaleTime().range([0, w]),
y = d3.scaleLinear().range([h, 0]),
z = d3.scaleOrdinal(d3.schemeCategory10);
var line = d3.line()
.curve(d3.curveBasis)
.x(function(d) { return x(d.date); })
.y(function(d) { return y(d.availableVolumeCapacity); });
d3.csv("ssystem.csv", function(error, data) {
if (error) throw error;
data.forEach(function(d) {
d.date = parseTime(d.date);
d.availableVolumeCapacity = +d.availableVolumeCapacity;
});
x.domain(d3.extent(data, function(d) { return d.date; }));
y.domain([0, d3.max(data, function(d) { return d.availableVolumeCapacity; })]);
var dataNest = d3.nest()
.key(function(d) {return d.storageSystem; })
.key(function(d) {return d.poolId; })
.entries(data);
console.log(dataNest)
legendSpace = w/dataNest.length;
dataNest.forEach(function(d,i) {
svg.append("path")
.attr("class", "line")
.style("stroke", function() {
return d.color = z(d.key); })
.attr("id", 'tag'+d.key.replace(/\s+/g, ''))
.attr("d", line(d.values));
svg.append("text")
.attr("x", (legendSpace/2)+i*legendSpace)
.attr("y", h + (m.bottom/2)+ 5)
.attr("class", "legend")
.style("fill", function() {
return d.color = z(d.key); })
.on("click", function(){
// Determine if current line is visible
var active = d.active ? false : true,
newOpacity = active ? 0 : 1;
// Hide or show the elements based on the ID
d3.select("#tag"+d.key.replace(/\s+/g, ''))
.transition().duration(100)
.style("opacity", newOpacity);
// Update whether or not the elements are active
d.active = active;
})
.text(d.key);
});
svg.append("g")
.attr("class", "axis axis--x")
.attr("transform", "translate(0," + h + ")")
.call(d3.axisBottom(x));
svg.append("g")
.attr("class", "axis axis--y")
.call(d3.axisLeft(y))
.append("text")
.attr("transform", "rotate(-90)")
.attr("y", 6)
.attr("dy", "0.71em")
.attr("fill", "#000")
.text("Capacity (MB)");
});
我从控制台看到以下错误4次:
Error: <path> attribute d: Expected number, "MNaN,NaNLNaN,NaN".
(anonymous) @ d3.v4.min.js:205
ul @ d3.v4.min.js:3768
al @ d3.v4.min.js:3775
(anonymous) @ multi-line.js:51
(anonymous) @ multi-line.js:45
(anonymous) @ d3.v4.min.js:5857
call @ d3.v4.min.js:3622
e @ d3.v4.min.js:5840
非常感谢任何帮助。
答案 0 :(得分:5)
问题的根源是传递给d
的匿名函数中的值dataNest.forEach
仍然包含一个嵌套级别,但您正在使用它,就好像它没有任何嵌套一样。您的代码失败是因为它在仅具有date
和availableVolumeCapacity
属性的对象上查找key
和values
属性。
最终有两种方法可以解决这个问题:
使用结合了存储系统和池ID的单键功能。这会将嵌套减少到只有一个级别:
var dataNest = d3.nest()
.key(function(d) { return d.storageSystem + " " + d.poolId; })
.entries(data);
使用两个嵌套调用forEach
:
dataNest.forEach(function(d2,i2) {
d2.forEach(function (d,i) {
svg.append("path")
// .... rest of inner function omitted
});
});
您需要在内部函数(我为了简洁而省略其正文)中使用d
(特别是d.key
)和i
的所有用法,看看是否需要合并d2
和i2
。例如,您可能希望使用d2.key + " " + d.key
代替d.key
。
答案 1 :(得分:2)
定义路径时:
svg.append("path")
.attr("class", "line")
.style("stroke", function() {
return d.color = z(d.key); })
.attr("id", 'tag'+d.key.replace(/\s+/g, ''))
.attr("d", line(d.values)); // d.values here is not defined
您使用的是教程中给出的内容,但dataNest
中的每个项目都没有values
属性。