Question

我试图结合我发现的两个D3.js例子这里bl.ocks.org/mbostock/1157787（多个例子）在这里bl.ocks.org/mbostock/3902569（mouseover example）。

到目前为止，一切都按预期工作。鼠标悬停焦点通过x（时间）链接在所有图表上，同时在每个图表上显示价格值。但是，显示的值和位置由最后一个图表的数据设置，显示所有其他图表上的错误位置和值。我想弄清楚的是如何使用它自己的值和焦点位置来解决每个图表。我发现了几个关于多个图表和多个鼠标悬停焦点位置的类似问题，但没有结合这两个主题。我是JS和D3的新手，所以我不知道如何为正确的焦点对象分配正确的值。见http://plnkr.co/edit/btAPsU0ra6uR3f4ZXZWj。这是我的代码

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

body {
  font: 10px sans-serif;
  margin: 0;
}

.axis path,
.axis line {
  fill: none;
  stroke: #000;
  //shape-rendering: crispEdges;
}

.line {
  fill: none;
  stroke: steelblue;
  stroke-width: 1.5px;
}

.area {
  //fill: #e7e7e7;
  fill: transparent;
}

.overlay {
  fill: none;
  pointer-events: all;
}

.focus circle {
  fill: none;
  stroke: steelblue;
}
</style>
<body>
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
<script>

var margin = {top: 8, right: 10, bottom: 20, left: 30},
    width = 960 - margin.left - margin.right,
    height = 138 - margin.top - margin.bottom;

var parseDate = d3.time.format("%b %Y").parse,
    bisectDate = d3.bisector(function(d) { return d.date; }).left,
    formatValue = d3.format(",.2f"),
    formatCurrency = function(d) { return formatValue(d); };

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

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

var area = d3.svg.area()
    .x(function(d) { return x(d.date); })
    .y0(height)
    .y1(function(d) { return y(d.price); });

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

var xAxis = d3.svg.axis()
  .scale(x)         // x is the d3.time.scale()
  .orient("bottom") // the ticks go below the graph
  .ticks(4);        // specify the number of ticks

var yAxis = d3.svg.axis()
    .scale(y)
    .orient("left")
    .ticks(4);

d3.csv("stocks_chart2.csv", type, function(error, data) {

    // Nest data by symbol.
    var symbols = d3.nest()
      .key(function(d) { return d.symbol; })
      .entries(data);

    // Compute the maximum price per symbol, needed for the y-domain.
    symbols.forEach(function(s) {
    s.maxPrice = d3.max(s.values, function(d) { return d.price; });
    });

    // Compute the minimum and maximum date across symbols.
    // We assume values are sorted by date.
    x.domain([
    d3.min(symbols, function(s) { return s.values[0].date; }),
    d3.max(symbols, function(s) { return s.values[s.values.length - 1].date; })
    ]);

    // Add an SVG element for each symbol, with the desired dimensions and margin.
    var svg = d3.select("body").selectAll("svg")
      .data(symbols)
    .enter().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 + ")");

    // Add the area path elements. Note: the y-domain is set per element.
    svg.append("path")
      .attr("class", "area")
      .attr("d", function(d) { y.domain([0, d.maxPrice]); return area(d.values); });

    // Add the line path elements. Note: the y-domain is set per element.
    svg.append("path")
      .attr("class", "line")
      .attr("d", function(d) { y.domain([0, d.maxPrice]); return line(d.values); });

    // Add a small label for the symbol name.
    svg.append("text")
      .attr("x", width - 6)
      .attr("y", height - 6)
      .style("text-anchor", "end")
      .text(function(d) { return d.key; });

    svg.append('g')            // create a <g> element
      .attr('class', 'x axis') // specify classes
      .attr("transform", "translate(0," + height + ")") 
      .call(xAxis);            // let the axis do its thing

    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("Value");

    var focus = svg.append("g")
      .attr("class", "focus")
      .style("display", "none");

    focus.append("circle")
      .attr("r", 4.5);

    focus.append("text")
      .attr("x", 9)
      .attr("dy", ".35em");

    svg.append("rect")
      .attr("class", "overlay")
      .attr("width", width)
      .attr("height", height)
      .on("mouseover", function() { focus.style("display", null); })
      .on("mouseout", function() { focus.style("display", "none"); })
      .on("mousemove", mousemove);

  function mousemove() {
    var x0 = x.invert(d3.mouse(this)[0]),
        i = bisectDate(data, x0, 1),
        d0 = data[i - 1],
        d1 = data[i],
        d = x0 - d0.date > d1.date - x0 ? d1 : d0;
    focus.attr("transform", "translate(" + x(d.date) + "," + y(d.price) + ")");
    focus.select("text").text(formatCurrency(d.price));
  }

});

function type(d) {
  d.price = +d.price;
  d.date = parseDate(d.date);
  return d;
}

</script>

和在multiples示例中使用的data.csv（缩短）

symbol,date,price
S&P 500,Jan 2000,1394.46
S&P 500,Feb 2000,1366.42
S&P 500,Mar 2000,1498.58
S&P 500,Apr 2000,1452.43
S&P 500,May 2000,1420.6
S&P 500,Jun 2000,1454.6
S&P 500,Jul 2000,1430.83
S&P 500,Aug 2000,1517.68
S&P 500,Sep 2000,1436.51
S&P 500,Oct 2000,1429.4
S&P 500,Nov 2000,1314.95
S&P 500,Dec 2000,1320.28
S&P 500,Jan 2001,1366.01
S&P 500,Feb 2001,1239.94
S&P 500,Mar 2001,1160.33
S&P 500,Apr 2001,1249.46
S&P 500,May 2001,1255.82
S&P 500,Jun 2001,1224.38
S&P 500,Jul 2001,1211.23
S&P 500,Aug 2001,1133.58
S&P 500,Sep 2001,1040.94
S&P 500,Oct 2001,1059.78
S&P 500,Nov 2001,1139.45
S&P 500,Dec 2001,1148.08
S&P 500,Jan 2002,1130.2
S&P 500,Feb 2002,1106.73
S&P 500,Mar 2002,1147.39
S&P 500,Apr 2002,1076.92
S&P 500,May 2002,1067.14
S&P 500,Jun 2002,989.82
S&P 500,Jul 2002,911.62
S&P 500,Aug 2002,916.07
S&P 500,Dec 2008,903.25
S&P 500,Jan 2009,825.88
S&P 500,Feb 2009,735.09
S&P 500,Mar 2009,797.87
S&P 500,Apr 2009,872.81
S&P 500,May 2009,919.14
S&P 500,Jun 2009,919.32
S&P 500,Jul 2009,987.48
S&P 500,Aug 2009,1020.62
S&P 500,Sep 2009,1057.08
S&P 500,Oct 2009,1036.19
S&P 500,Nov 2009,1095.63
S&P 500,Dec 2009,1115.1
S&P 500,Jan 2010,1073.87
S&P 500,Feb 2010,1104.49
S&P 500,Mar 2010,1140.45
MSFT,Jan 2000,39.81
MSFT,Feb 2000,36.35
MSFT,Mar 2000,43.22
MSFT,Apr 2000,28.37
MSFT,May 2000,25.45
MSFT,Jun 2000,32.54
MSFT,Jul 2000,28.4
MSFT,Aug 2000,28.4
MSFT,Sep 2000,24.53
MSFT,Oct 2000,28.02
MSFT,Nov 2000,23.34
MSFT,Dec 2000,17.65
MSFT,Jan 2001,24.84
MSFT,Feb 2001,24
MSFT,Mar 2001,22.25
MSFT,Apr 2001,27.56
MSFT,Aug 2009,24.43
MSFT,Sep 2009,25.49
MSFT,Oct 2009,27.48
MSFT,Nov 2009,29.27
MSFT,Dec 2009,30.34
MSFT,Jan 2010,28.05
MSFT,Feb 2010,28.67
MSFT,Mar 2010,28.8
AMZN,Jan 2000,64.56
AMZN,Feb 2000,68.87
AMZN,Mar 2000,67
AMZN,Apr 2000,55.19
AMZN,May 2000,48.31
AMZN,Jun 2000,36.31
AMZN,Jul 2000,30.12
AMZN,Aug 2000,41.5
AMZN,Sep 2000,38.44
AMZN,Oct 2000,36.62
AMZN,Nov 2000,24.69
AMZN,Dec 2000,15.56
AMZN,Jan 2001,17.31
AMZN,Feb 2001,10.19
AMZN,Mar 2001,10.23
AMZN,Apr 2001,15.78
AMZN,May 2001,16.69
AMZN,Jun 2001,14.15
AMZN,Jul 2001,12.49
AMZN,May 2007,69.14
AMZN,Jun 2007,68.41
AMZN,Jul 2007,78.54
AMZN,Aug 2007,79.91
AMZN,Sep 2007,93.15
AMZN,Oct 2007,89.15
AMZN,Nov 2007,90.56
AMZN,Dec 2007,92.64
AMZN,Jan 2008,77.7
AMZN,Feb 2008,64.47
AMZN,Mar 2008,71.3
AMZN,Apr 2008,78.63
AMZN,May 2008,81.62
AMZN,Jun 2008,73.33
AMZN,Jul 2008,76.34
AMZN,Aug 2008,80.81
AMZN,Sep 2008,72.76
AMZN,Oct 2008,57.24
AMZN,Nov 2008,42.7
AMZN,Dec 2008,51.28
AMZN,Jan 2009,58.82
AMZN,Feb 2009,64.79
AMZN,Mar 2009,73.44
AMZN,Apr 2009,80.52
AMZN,May 2009,77.99
AMZN,Jun 2009,83.66
AMZN,Jul 2009,85.76
AMZN,Aug 2009,81.19
AMZN,Sep 2009,93.36
AMZN,Oct 2009,118.81
AMZN,Nov 2009,135.91
AMZN,Dec 2009,134.52
AMZN,Jan 2010,125.41
AMZN,Feb 2010,118.4
AMZN,Mar 2010,128.82
IBM,Jan 2000,100.52
IBM,Feb 2000,92.11
IBM,Mar 2000,106.11
IBM,Jun 2003,75.42
IBM,Jul 2003,74.28
IBM,Aug 2003,75.12
IBM,Sep 2003,80.91
IBM,Mar 2009,95.09
IBM,Apr 2009,101.29
IBM,May 2009,104.85
IBM,Jun 2009,103.01
IBM,Jul 2009,116.34
IBM,Aug 2009,117
IBM,Sep 2009,118.55
IBM,Oct 2009,119.54
IBM,Nov 2009,125.79
IBM,Dec 2009,130.32
IBM,Jan 2010,121.85
IBM,Feb 2010,127.16
IBM,Mar 2010,125.55
GOOG,Aug 2004,102.37
GOOG,Sep 2004,129.6
GOOG,Oct 2004,190.64
GOOG,Nov 2004,181.98
GOOG,Dec 2004,192.79
GOOG,Jan 2005,195.62
GOOG,Feb 2005,187.99
GOOG,Mar 2005,180.51
GOOG,Apr 2005,220
GOOG,May 2005,277.27
GOOG,Jun 2005,294.15
GOOG,Jul 2005,287.76
GOOG,Aug 2005,286
GOOG,Sep 2005,316.46
GOOG,Oct 2005,372.14
GOOG,Nov 2005,404.91
GOOG,Dec 2005,414.86
GOOG,Jan 2006,432.66
GOOG,Feb 2006,362.62
GOOG,Mar 2006,390
GOOG,Apr 2006,417.94
GOOG,May 2006,371.82
GOOG,Jun 2006,419.33
GOOG,Jul 2006,386.6
GOOG,Aug 2006,378.53
GOOG,Sep 2006,401.9
GOOG,Oct 2006,476.39
GOOG,Nov 2006,484.81
GOOG,Jul 2009,443.05
GOOG,Aug 2009,461.67
GOOG,Sep 2009,495.85
GOOG,Oct 2009,536.12
GOOG,Nov 2009,583
GOOG,Dec 2009,619.98
GOOG,Jan 2010,529.94
GOOG,Feb 2010,526.8
GOOG,Mar 2010,560.19
10 Year T-Note,Jan 2000,6.67
10 Year T-Note,Feb 2000,6.41
10 Year T-Note,Mar 2000,6.02
10 Year T-Note,Apr 2000,6.21
10 Year T-Note,May 2000,6.28
10 Year T-Note,Jun 2000,6.02
10 Year T-Note,Jul 2000,6.03
10 Year T-Note,Aug 2000,5.73
10 Year T-Note,Sep 2000,5.78
10 Year T-Note,Oct 2000,5.76
10 Year T-Note,Nov 2000,5.44
10 Year T-Note,Dec 2000,5.11
10 Year T-Note,Jan 2001,5.18
10 Year T-Note,Feb 2001,4.91
10 Year T-Note,Mar 2001,4.91
10 Year T-Note,Apr 2001,5.34
10 Year T-Note,May 2001,5.41
10 Year T-Note,Jun 2001,5.39
10 Year T-Note,Jul 2001,5.04
10 Year T-Note,Aug 2001,4.82
10 Year T-Note,Sep 2001,4.57
AAPL,Jan 2000,25.94
AAPL,Feb 2000,28.66
AAPL,Mar 2000,33.95
AAPL,Apr 2000,31.01
AAPL,May 2000,21
AAPL,Jun 2000,26.19
AAPL,Jul 2000,25.41
AAPL,Aug 2000,30.47
AAPL,Sep 2000,12.88
AAPL,Oct 2000,9.78
AAPL,Nov 2000,8.25
AAPL,Dec 2000,7.44
AAPL,Jan 2001,10.81
AAPL,Feb 2001,9.12
AAPL,Mar 2001,11.03
AAPL,Apr 2001,12.74
AAPL,May 2001,9.98

任何帮助将不胜感激！谢谢！

Answer 1

我不是很完美，但我相信这应该让你开始。您正在做的事情不起作用的原因是因为您在所有图表中共享数据d。

function mousemove() {
    var date = x.invert(d3.mouse(this)[0]),
        index = bisectDate(data, date, 1),
        d0 = data[index - 1],
        d1 = data[index],
        d = date - d0.date > d1.date - date ? d1 : d0;
    focus.attr("transform", "translate(" + x(d.date) + "," + y(d.price) + ")");
    focus.select("text").text(formatCurrency(d.price));

因此，这里的一些代码选择了您用于工具提示的所有focus项，但是正在应用d.price的格式化货币。但是，如果你看一下，推动价格的d直接来自鼠标移动的数据。

而您需要做的是分别为每个焦点项目分配数据。不幸的是，由于我没有追踪index是如何计算的，所以我还没有完全发挥作用，但这给出了这个想法：

function mousemove() {
   var date = x.invert(d3.mouse(this)[0]),
    index = bisectDate(data, date, 1),
    d0 = data[index - 1],
    d1 = data[index],
    d = date - d0.date > d1.date - date ? d1 : d0;

    var focus = svg.selectAll(".focus");

    focus.attr("translate", function(d) {
      return "translate(" + x(d.values[index].date) + "," + y(d.values[index].price) + ")"
    });

    focus.selectAll("text", function(d) {
      return formatCurrency(d.values[index].price);
    });
}

所以这里发生的是每个focus项目的翻译和文本都是从驱动该系列的数据中专门设置的。 d参数现在是作用域（并且将在之前的数据绑定后自动从D3提供）到这些函数，并将用于访问您想要的实际数据。

D3.js：多个折线图鼠标悬停，相同的x（时间）显示不同的y（价格）

1 个答案: