Question

根据D3.js页面复制简单示例 for barchart 仍然我的屏幕上没有任何东西，除了左黑线。有人可以帮助我吗？

HTML

<!DOCTYPE html>
<meta charset="utf-8">
<style>

.bar {
  fill: steelblue;
}

.bar:hover {
  fill: brown;
}

.axis--x path {
  display: none;
}

</style>
<svg width="960" height="500"></svg>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>

var svg = d3.select("svg"),
    margin = {top: 20, right: 20, bottom: 30, left: 40},
    width = +svg.attr("width") - margin.left - margin.right,
    height = +svg.attr("height") - margin.top - margin.bottom;

var x = d3.scaleBand().rangeRound([0, width]).padding(0.1),
    y = d3.scaleLinear().rangeRound([height, 0]);

var g = svg.append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

d3.tsv("data.tsv", function(d) {
  d.frequency = +d.frequency;
  return d;
}, function(error, data) {
  if (error) throw error;

  x.domain(data.map(function(d) { return d.letter; }));
  y.domain([0, d3.max(data, function(d) { return d.frequency; })]);

  g.append("g")
      .attr("class", "axis axis--x")
      .attr("transform", "translate(0," + height + ")")
      .call(d3.axisBottom(x));

  g.append("g")
      .attr("class", "axis axis--y")
      .call(d3.axisLeft(y).ticks(10, "%"))
    .append("text")
      .attr("transform", "rotate(-90)")
      .attr("y", 6)
      .attr("dy", "0.71em")
      .attr("text-anchor", "end")
      .text("Frequency");

  g.selectAll(".bar")
    .data(data)
    .enter().append("rect")
      .attr("class", "bar")
      .attr("x", function(d) { return x(d.letter); })
      .attr("y", function(d) { return y(d.frequency); })
      .attr("width", x.bandwidth())
      .attr("height", function(d) { return height - y(d.frequency); });
});

</script>

data.tsv

letter  frequency
A   .08167
B   .01492
C   .02782
D   .04253
E   .12702
F   .02288
G   .02015
H   .06094
I   .06966
J   .00153
K   .00772
L   .04025
M   .02406
N   .06749
O   .07507
P   .01929
Q   .00095
R   .05987
S   .06327
T   .09056
U   .02758
V   .00978
W   .02360
X   .00150
Y   .01974
Z   .00074

参考

https://bl.ocks.org/mbostock/3885304

请告诉我，我在哪里做错了？

Answer 1

看起来问题是因为IDE了解.tsv文件中的TAB的方式。

我怀疑如果您在第37行放入一些控制台登录（或调试），您会看到字母和频率值都被读入“letter”属性。即两个值之间的TAB未被识别。这将导致y的'Nan'值传播到每个rect上的高度的'Nan'值。

您的IDE中可能有一个设置允许选项卡按预期识别。

简单的条形图d3

1 个答案: