"错误:<路径>属性d:预期数字"MNaN，NaNLNaN，NaNL…". " D3错误

问题描述

我正在从Quandl的API中导入一些数据，以绘制多年来布伦特油价的图表.我正在使用Angular发出的HTTP请求提供数据.不知何故，正在提供服务的数据没有被读取为数字，因为出现以下错误:

I'm importing some data from Quandl's API to make a chart of brent oil prices over the years. I'm serving the data from a HTTP-request made with Angular. Somehow the data being served is not being read as numbers, since i get the following error:

app.service('oilService', function($http) {
  delete $http.defaults.headers.common['X-Requested-With'];
  this.getData = function() {
  var URL = "https://www.quandl.com/api/v1/datasets/CHRIS/ICE_B1.json";
  return $http({
     method: 'GET',
     url: URL
  })
 }
})

.directive('oilGraph', function() {
 return {
  scope: {},
  controller: function(oilService) {
  var width = 200;
  var height = 100;

  var parseTime = d3.timeParse("%y-%m-%d");

  var x = d3.scaleTime().range([0, width]);
  var y = d3.scaleLinear().range([height, 0]);

  var valueline = d3.line()
      .x(function(d) { return x(d.date); })
      .y(function(d) { return y(d.settle); });
  var svg = d3.select("#oilgraph").append("svg")
        .attr("width", width)
        .attr("height", height);

  oilService.getData()
  .then(function(data) {

      var mapped_data = data.data.data.map(function(d) {
        return {
          date: parseTime(d[0]),
          settle: d[4]
        };
      })

      x.domain(d3.extent(data, function(d) { return d.date; }));
      y.domain([0, d3.max(data, function(d) { return d.settle; })]);

      svg.append("path")
          .data([mapped_data])
          .attr("class", "line")
          .attr("d", valueline);

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

      svg.append("g")
          .call(d3.axisLeft(y));
    })
   })
  }
 }
})

推荐答案

您的问题只是一个错误的说明符.既然你的约会有世纪了...

Your problem is just a wrong specifier. Since your dates have the century...

"2017-06-16"

...您应该使用%Y而不是%y.根据 API :

... you should use %Y instead of %y. According to the API:

因此，这应该是您的说明符:

Thus, this should be your specifier:

var parseTime = d3.timeParse("%Y-%m-%d");

除此之外，您必须在秤中使用mapped_data，而不是data.

Besides that, you have to use mapped_data in the scales, not data.

这是您所做的更改的代码:

Here is your code with that changes:

var width = 500;
var height = 200;

var parseTime = d3.timeParse("%Y-%m-%d");

var x = d3.scaleTime().range([0, width]);
var y = d3.scaleLinear().range([height, 0]);

var valueline = d3.line()
  .x(function(d) {
    return x(d.date);
  })
  .y(function(d) {
    return y(d.settle);
  });

var svg = d3.select("body").append("svg")
  .attr("width", width)
  .attr("height", height);

d3.json("https://www.quandl.com/api/v1/datasets/CHRIS/ICE_B1.json", function(data) {

  var mapped_data = data.data.map(function(d) {
    return {
      date: parseTime(d[0]),
      settle: d[4]
    };
  });

  x.domain(d3.extent(mapped_data, function(d) {
    return d.date;
  }));
  y.domain([0, d3.max(mapped_data, function(d) {
    return d.settle;
  })]);

  svg.append("path")
    .data([mapped_data])
    .attr("class", "line")
    .attr("d", valueline);

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

  svg.append("g")
    .call(d3.axisLeft(y));

})

path {
  fill: none;
  stroke: black;
}

<script src="https://d3js.org/d3.v4.min.js"></script>

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