具有离散值的 nvd3 堆积条形图 [英] nvd3 Stacked Bar Chart with discrete values

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本文介绍了具有离散值的 nvd3 堆积条形图的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我正在尝试使用 nvd3 创建垂直堆积条形图.我将使用离散数据值，而不是随机生成的值作为其网站上的示例.

我尝试使用组/堆积条形图的实时代码示例，并放入包含我自己的值的 JSON 数据.我试图做的是从水平条形图中取出JSON数据，并将其作为垂直条形图的数据.

这是我在实时代码示例中使用的数据代替组/堆积条形图中的数据:

<预><代码>[{"key": "系列 1","颜色": "#d62728",价值观":[{"label" : "A组" ,价值":-1.8746444827653} ,{"label" : "Group B" ,价值":-8.0961543492239} ,{"label" : "C组" ,价值":-0.57072943117674} ,{"label" : "Group D" ,价值":-2.4174010336624} ,{"label" : "Group E" ,价值":-0.72009071426284} ,{"label" : "Group F" ,价值":-0.77154485523777} ,{"label" : "Group G" ,价值":-0.90152097798131} ,{"label" : "H 组" ,价值":-0.91445417330854} ,{"label" : "Group I" ,价值":-0.055746319141851}]},{"key": "系列 2","颜色": "#1f77b4",价值观":[{"label" : "A组" ,价值":25.307646510375} ,{"label" : "Group B" ,价值":16.756779544553} ,{"label" : "C组" ,价值":18.451534877007} ,{"label" : "Group D" ,价值":8.6142352811805} ,{"label" : "Group E" ,价值":7.8082472075876} ,{"label" : "Group F" ,价值":5.259101026956} ,{"label" : "Group G" ,价值":0.30947953487127} ,{"label" : "H 组" ,价值":0} ,{"label" : "Group I" ,价值":0}]}]

我将 javascript 中对 data() 的函数调用替换为 data:

nv.addGraph(function() {var chart = nv.models.multiBarChart();图表.xAxis.tickFormat(d3.format(',f'));图表.y轴.tickFormat(d3.format(',.1f'));d3.select('#chart svg').datum(数据).transition().duration(500).call(chart);nv.utils.windowResize(chart.update);返回图表；});

图表正确标记了我的系列，但没有显示条形图.这个图可以不取这种类型的数据吗?我的数据使用水平条，但如果可能，我想使用垂直条.

解决方案

组/堆叠条形图(multiBarChart 模型)与 x 和 一起使用y 属性，其中 y 是条的高度，x 是标签，可能是一些数字或文本.

不幸的是，关于确切数据格式的文档并不多，我发现的所有示例都使用了一些令人困惑的函数来生成数据.所以这是我使用混合数字和文本标签工作的示例:

var chart = nv.models.multiBarChart();d3.select('#chart svg').datum([{键:S1"，颜色:#51A351"，价值观:[{ x : "A", y : 40 },{ x : "B", y : 30 },{ x : 5, y : 20 }]},{键:S2"，颜色:#BD362F"，价值观:[{ x : "A", y : 60 },{ x : "B", y : 50 },{ x : 5, y : 70 }]}]).transition().duration(500).call(chart);

<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.4.11/d3.min.js"></script><script src="https://cdnjs.cloudflare.com/ajax/libs/nvd3/1.8.1/nv.d3.min.js"></script><link rel="stylesheet" type="text/css" href="https://cdnjs.cloudflare.com/ajax/libs/nvd3/1.8.1/nv.d3.min.css"><div id="chart" style="height: 200px;"><svg></svg></div>

<小时>

现在您的代码有两个问题:

  1. 您需要删除要使用文本标记的轴的 tickFormat.
    tickFormat 函数设置轴标签的数字格式.只有当标签可以转换为数字并且在您的情况下会导致 NaN 时，它才会起作用.

  2. 您需要将 label 和 value 属性重命名为 x 和 y 或者您需要创建函数来提供这些值:

    var chart = nv.models.multiBarChart();chart.x(function(d) { return d.label; });chart.y(function(d) { return d.value; });d3.select('#chart svg').datum(/* 你的数据 */).transition().duration(500).call(chart);

I am trying to use nvd3 to create a vertical stacked bar chart. I will be using discrete data values, as opposed to randomly generated values as the example on their website.

I have tried to play around with the live code example of the Group / Stacked Bar Chart and put in JSON data containing my own values. What I tried to do was take the JSON data from the horizontal bar chart and put it in as the data for the vertical bar chart.

This is the data I used on the live code example in place of the data in the Group / Stacked Bar Chart:

[
  {
    "key": "Series1",
    "color": "#d62728",
    "values": [
      { 
        "label" : "Group A" ,
        "value" : -1.8746444827653
      } , 
      { 
        "label" : "Group B" ,
        "value" : -8.0961543492239
      } , 
      { 
        "label" : "Group C" ,
        "value" : -0.57072943117674
      } , 
      { 
        "label" : "Group D" ,
        "value" : -2.4174010336624
      } , 
      {
        "label" : "Group E" ,
        "value" : -0.72009071426284
      } , 
      { 
        "label" : "Group F" ,
        "value" : -0.77154485523777
      } , 
      { 
        "label" : "Group G" ,
        "value" : -0.90152097798131
      } , 
      {
        "label" : "Group H" ,
        "value" : -0.91445417330854
      } , 
      { 
        "label" : "Group I" ,
        "value" : -0.055746319141851
      }
    ]
  },
  {
    "key": "Series2",
    "color": "#1f77b4",
    "values": [
      { 
        "label" : "Group A" ,
        "value" : 25.307646510375
      } , 
      { 
        "label" : "Group B" ,
        "value" : 16.756779544553
      } , 
      { 
        "label" : "Group C" ,
        "value" : 18.451534877007
      } , 
      { 
        "label" : "Group D" ,
        "value" : 8.6142352811805
      } , 
      {
        "label" : "Group E" ,
        "value" : 7.8082472075876
      } , 
      { 
        "label" : "Group F" ,
        "value" : 5.259101026956
      } , 
      { 
        "label" : "Group G" ,
        "value" : 0.30947953487127
      } , 
      { 
        "label" : "Group H" ,
        "value" : 0
      } , 
      { 
        "label" : "Group I" ,
        "value" : 0 
      }
    ]
  }
]

I replaced the function call to data() in the javascript to data:

nv.addGraph(function() {
    var chart = nv.models.multiBarChart();

    chart.xAxis
        .tickFormat(d3.format(',f'));

    chart.yAxis
        .tickFormat(d3.format(',.1f'));

    d3.select('#chart svg')
        .datum(data)
      .transition().duration(500).call(chart);

    nv.utils.windowResize(chart.update);

    return chart;
});

The graph properly labels my series but does not show the bars. Can this graph not take this type of data? I got my data working with the horizontal bars, but I would like to use vertical bars if possible.

解决方案

The group/stacked bar chart (the multiBarChart model) is used with x and y attributes, where y is the height of the bar and x is the label and may be some number or a text.

Unfortunately there isn't much documentation on the exact data format and all examples I found use some confusing functions to generate data. So here's an example I got working using mixed numeric and text labels:

var chart = nv.models.multiBarChart();
d3.select('#chart svg').datum([
  {
    key: "S1",
    color: "#51A351",
    values:
    [      
      { x : "A", y : 40 },
      { x : "B", y : 30 },
      { x : 5,   y : 20 }  
    ]
  },
  {
    key: "S2",
    color: "#BD362F",
    values:
    [      
      { x : "A", y : 60 },
      { x : "B", y : 50 },
      { x : 5,   y : 70 } 
    ]
  }
]).transition().duration(500).call(chart);

<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.4.11/d3.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/nvd3/1.8.1/nv.d3.min.js"></script>
<link rel="stylesheet" type="text/css" href="https://cdnjs.cloudflare.com/ajax/libs/nvd3/1.8.1/nv.d3.min.css">

<div id="chart" style="height: 200px;"><svg></svg></div>

Now there are two issues with your code:

  1. You need to remove the tickFormat for axis you intend to label with texts.
    The tickFormat function sets a number format for the axis' labels. It will only work if the label can be converted to a number and would result in NaN in your case.

  2. You need either to rename the label and value attributes to x and y or you need to create functions to provide those values:

    var chart = nv.models.multiBarChart();

chart.x(function(d) { return d.label; });
chart.y(function(d) { return d.value; });

d3.select('#chart svg')
  .datum( /* your data */ )
  .transition().duration(500).call(chart);

这篇关于具有离散值的 nvd3 堆积条形图的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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