Question

大家好！目前正在尝试使用带有简单JSON数据的D3生成折线图。我正在使用mbostock's line chart code，我只是用我自己的JSON文件更改data.tsv：

[
{"date":"Aug-14","close":"1"},
{"date":"Feb-14","close":"2"},
{"date":"Jan-14","close":"1"},
{"date":"Jul-14","close":"3"},
{"date":"Jun-14","close":"1"},
{"date":"Mar-14","close":"3"},
{"date":"May-14","close":"1"},
{"date":"Nov-14","close":"1"},
{"date":"Oct-14","close":"1"},
{"date":"Sep-14","close":"1"}
]

但是，我得到的图表看起来像this crazy line chart

我不知道为什么它会画那样的台词。任何输入都会很棒！

编辑：添加我正在使用的当前代码。

<script>
//Setting up...
var margin = {top: 20, right: 20, bottom: 30, left: 50},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;

var parseDate = d3.time.format("%d-%b-%y").parse;

var x = d3.time.scale()
    .range([0, width]);

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

var xAxis = d3.svg.axis()
    .scale(x)
    .orient("bottom");

var yAxis = d3.svg.axis()
    .scale(y)
    .orient("left");

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

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 + ")");

d3.json("test.php", function(error, data) {
  data.forEach(function(d) {
    d.date = parseDate(d.date);
    d.close = +d.close;
    console.log(d.date);
  });

  x.domain(d3.extent(data, function(d) { return d.date; }));
  y.domain(d3.extent(data, function(d) { return d.close; }));

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

  svg.append("g")
      .attr("class", "y axis")
      .call(yAxis)
    .append("text")
      .attr("transform", "rotate(-90)")
      .attr("y", 6)
      .attr("dy", ".71em")
      .style("text-anchor", "end")
      .text("Price ($)");

  svg.append("path")
      .datum(data)
      .attr("class", "line")
      .attr("d", line);
});
</script>

Answer 1

如果不直接查看您的代码，很难说，但您可能无法将Number传递给您的缩放功能。在您复制的源代码中，请参阅：

data.forEach(function(d) {
  d.date = parseDate(d.date);
  d.close = +d.close;
});

或者，只需传递close为Number的数据。

[                                                                                                                                                                                                                                                                                                                                                                       
{"date":"Aug-14","close":1},
{"date":"Feb-14","close":2},
{"date":"Jan-14","close":1},
{"date":"Jul-14","close":3},
{"date":"Jun-14","close":1},
{"date":"Mar-14","close":3},
{"date":"May-14","close":1},
{"date":"Nov-14","close":1},
{"date":"Oct-14","close":1},
{"date":"Sep-14","close":1}
]

编辑：

另请注意，您链接的示例中的日期已排序，而您的链接则不是。

var parseDate = d3.time.format("%b-%y").parse;

data.sort(function(a, b) { 
  return d3.ascending(parseDate(a.date), parseDate(b.date)); 
});

D3中的折线图遍布各处

1 个答案: