javascript - 使用 D3 网格问题和控制台错误的分组条形图

Question

我正在使用 D3 创建分组条形图。我写了代码，但条形图显示不正确，我无法找出这个问题的原因。请参阅本文随附的代码。

var margin = {
    top: 20,
    right: 30,
    bottom: 30,
    left: 40
  },
  width = 960 - margin.left - margin.right,
  height = 500 - margin.top - margin.bottom;

var z = d3.scale.category20c();

var svg = d3.select("body").append("svg")
  .attr("width", width + margin.left + margin.right)
  .attr("height", height + margin.top + margin.bottom)
  .append("g")
  .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

var parseDate = d3.time.format("%Y-%m-%dT%H:%M:%S.%LZ");

var data = [{
  "data": [
    [
      "2016-01-21T01:20:00.000Z",
      1.41818181818182
    ],
    [
      "2016-01-21T02:28:00.000Z",
      1.90661764705882
    ],
    [
      "2016-01-21T03:36:00.000Z",
      1.66764705882353
    ],
    [
      "2016-01-21T04:44:00.000Z",
      1.51691176470588
    ],
    [
      "2016-01-21T05:52:00.000Z",
      1.40955882352941
    ],
    [
      "2016-01-21T07:00:00.000Z",
      1.46323529411765
    ],
    [
      "2016-01-21T08:08:00.000Z",
      1.48308823529412
    ],
    [
      "2016-01-21T09:16:00.000Z",
      1.89384615384615
    ]
  ],
  "label": "a"
}, {
  "data": [
    [
      "2016-01-21T01:20:00.000Z",
      4.98701298701299
    ],
    [
      "2016-01-21T02:28:00.000Z",
      5.0
    ],
    [
      "2016-01-21T03:36:00.000Z",
      4.94852941176471
    ],
    [
      "2016-01-21T04:44:00.000Z",
      4.91176470588235
    ],
    [
      "2016-01-21T05:52:00.000Z",
      4.81617647058824
    ],
    [
      "2016-01-21T07:00:00.000Z",
      5.0
    ],
    [
      "2016-01-21T08:08:00.000Z",
      4.94117647058824
    ],
    [
      "2016-01-21T09:16:00.000Z",
      4.96969696969697
    ]
  ],
  "label": "b"
}];


var x = d3.scale.ordinal().rangeRoundBands([0, width], .9);

var y = d3.scale.linear()
  .range([height, 0]);

var xAxis = d3.svg.axis()
  .scale(x).tickSize(0)
  .orient("bottom").innerTickSize(-height).outerTickSize(0)
  .tickFormat(d3.time.format("%H:%M"));

var yAxis = d3.svg.axis()
  .scale(y)
  .orient("left").innerTickSize(-width).outerTickSize(0);

var ary = [];
data.forEach(function(d) {
  ary.push(d.data);
});

x.domain(ary[0].map(function(d) {
  return parseDate.parse(d[0]);
}));

y.domain([0, d3.max(d3.merge(ary), function(d) {
  console.log(d.y0 + d.y); //This is NaN = Not a number
  //return d.y0 + d.y;
  return d[1]; //returns grid lines if that is what you want
})]);

svg.append("g")
  .attr("class", "x axis")
  .attr("transform", "translate(0," + height + ")")
  .call(xAxis);

svg.append("g")
  .attr("class", "y axis")
  .call(yAxis);

var layer = svg.selectAll(".layer")
  .data(data)
  .enter().append("g")
  .attr("class", "layer")
  .style("fill", function(d, i) {
    return z(i);
  });

layer.selectAll("rect")
  .data(function(d) {
    return d.data;
  })
  .enter().append("rect")
  .attr("x", function(d) {
    return x(parseDate.parse(d[0]));
  })
  .attr("y", function(d) {
    console.log(d[1]);
    return y(d[1]); //Note this is returning data
  })
  .attr("height", function(d) {
    return y(d[1]); //Note this is returning data
  })
  .attr("width", x.rangeBand() - 1);

text.inner-circle {
  font-weight: 400;
  font-size: 12px;
  text-transform: uppercase;
}
text.inner-text {
  font-weight: 400;
  font-size: 36px;
  font-family: 'Metric Regular', 'Metric';
  text-align: center;
  font-style: normal;
  text-transform: uppercase;
}
path {
  stroke: steelblue;
  stroke-width: 2;
  fill: none;
}
.axis path,
.axis line {
  fill: none;
  stroke: grey;
  stroke-width: 2;
  shape-rendering: crispEdges;
}
.grid .tick {
  stroke: lightgrey;
  stroke-opacity: 0.7;
  shape-rendering: crispEdges;
}
.grid path {
  stroke-width: 0;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.4.11/d3.min.js"></script>

请帮助我找出我做错了什么。 Plnkr.co

Answer 1

显示您的网格。

y.domain([0, d3.max(d3.merge(ary), function(d) {
  console.log(d.y0 + d.y); //This is NaN = Not a number
  //return d.y0 + d.y;
  return d[1]; //returns grid lines if that is what you want
})]);

同时解决这部分代码:

layer.selectAll("rect")
  .data(function(d) {
    return d.data;
  })
  .enter().append("rect")
  .attr("x", function(d) {
    return x(parseDate.parse(d[0]));
  })
  .attr("y", function(d) {
    console.log(d[1]);
    return y(d[1]); //Note this is returning data
  })
  .attr("height", function(d) {
    return y(d[1]); //Note this is returning data
  })
  .attr("width", x.rangeBand() - 1);

通过对您的代码进行上述修复，我看到了您的矩形而不是错误。但是，您有一些 css 修复需要解决，因为您的条形图偏离了 x 轴。数据分组也缺少相当多的代码。

这里是 an example的分组条形图。在查看此示例时，我发现您确实有办法区分 x0 和 x1(第一组和第二组)。您需要将其添加到您的代码中才能到达下一组矩形。