在设置间隔上从现有DataTable更新数据点

Question

我希望HighChart更新系列，方法是将下一个数据点添加到图表中，以便图表“播放”。 我有一个包含X和Y组件的数据系列。我希望图表能够在本系列的下一个点进行更新（比如每秒）。 我在使用DotNet.HighCharts API的VB.NET 4站点中使用它。我已经跟进了几个演示（例如this一个）并且所有这些都使用了一些随机生成的值。如何让图表使用现有的一组点？这是一个使用随机函数的jsFiddle - http://jsfiddle.net/tQpNN/3/ 我只是不知道如何遍历传入的数据系列（如果是这样做的话）或者让DotNet.HighCharts为我迭代。

使用一些代码

编辑：

    Dim stfipsList4 = (From r In dt4.AsEnumerable() Select r("areaname")).Distinct().ToList()
    Dim SeriesList4 As New List(Of Series)(stfipsList4.Count)
    Dim seriesItem4(stfipsList4.Count) As Series
    Dim xDate4 As DateTime
    Dim fakeDate4 As String
    Dim sX4 As Integer

    sX4 = 1
    For Each state In stfipsList4
        Dim data As New Dictionary(Of DateTime, Decimal)
        Dim stateVal As String = state.ToString
        Dim recCount As Integer = dt4.Rows.Count - 1
        Dim seriesPointCount As Integer = dt4.Compute("Count(population)", "areaname = '" + stateVal + "'")
        Dim chartData As Object(,) = New Object(seriesPointCount - 1, 1) {}
        Dim x As Integer = 0
        For i As Integer = 0 To recCount
            If dt4.Rows(i)("areaname").ToString = stateVal Then
                fakeDate4 = "1/1/" + dt4.Rows(i)("periodyear").ToString
                xDate3 = DateTime.Parse(fakeDate4)
                chartData.SetValue(xDate4.Date, x, 0)
                chartData.SetValue(dt4.Rows(i)("population"), x, 1)
                x += 1
            End If

        Next

        seriesItem4(sX4) = New Series With {
                    .Name = state.ToString, _
                    .Data = New Helpers.Data(chartData)
        }

        SeriesList4.Add(seriesItem3(sX4))

        sX4 = sX4 + 1
    Next


    Dim iterateData As String = JsonSerializer.Serialize(New Helpers.Data(New Object() {seriesItem3(1).Data}))

    Dim chart4 As Highcharts = New Highcharts("chart4").SetOptions(New Helpers.GlobalOptions() With { _
        .[Global] = New [Global]() With { _
                .UseUTC = False _
            } _
        }).InitChart(New Chart() With { _
         .DefaultSeriesType = ChartTypes.Spline, _
         .MarginRight = 10, _
         .Events = New ChartEvents() With { _
          .Load = "ChartEventsLoad" _
         } _
        }).SetTitle(New Title() With { _
         .Text = "Live data" _
        }).SetXAxis(New XAxis() With { _
         .Type = AxisTypes.Datetime, _
         .TickPixelInterval = 150 _
        }).SetSeries(New Series() With { _
             .Data = New Helpers.Data(New Object() {})
            }) _
    .AddJavascripVariable("counter", "0") _
    .AddJavascripVariable("stockData", iterateData) _
    .AddJavascripFunction("ChartEventsLoad", "// set up the updating of the chart each second" & vbCr & vbLf & _
                          " var series = this.series[0];" & vbCr & vbLf & _
                          " setInterval(function() {" & vbCr & vbLf & _
                          " var x = stockData[counter].key;" & vbCr & vbLf & _
                          " var y = stockData[counter].value;" & vbCr & vbLf & _
                          " series.addPoint([x, y], true, series.points.length > 10);" & vbCr & vbLf & _
                          " counter++;" & vbCr & vbLf & _
                          "}, 1000);")

这传递了我的一系列数据（可能是1个或多个不同的个别系列）。我想要做的是通过一次添加一个点来使系列点“播放”（通过缩放x轴但我不想删除任何点）。这个虚拟版本只是在给定时刻添加一个新的随机y值。我不知道如何迭代我现有的数据。

这会将“stockData”javascript var设置为我的数据集。我在FireBug中看到错误说明

  

stockData [counter]未定义

var counter在$(document).ready(function)以及stockdata和chart4图表中定义。有关DotNet.Highcharts API吐出的信息，请参阅http://jsfiddle.net/ZvYT6/。 迭代的内联javascript看起来像这样：

        function ChartEventsLoad(){
        // set up the updating of the chart each second
 var series = this.series[0];
 setInterval(function() {
 var x = stockData[counter].key;
 var y = stockData[counter].value;
 series.addPoint([x, y], true, series.points.length > 10);
 counter++;
}, 1000);
    }
});

我真正不确定的部分是stockData[counter]键/值。这在javascript中被称为什么？ stockdata是一个看起来像这样的数据列表：

    var stockData = { data: [{ data: [[Date.parse('01/01/1900 00:00:00'), 530000],
    ....,
[Date.parse('01/01/2010 00:00:00'), 18801310]]
    }]
    };

编辑v4： 好的，现在我可以使用一些讨厌的javascript来解析我的数据数组。

    Dim iterateData As String = JsonSerializer.Serialize(seriesItem3(1))

    Dim chart4 As Highcharts = New Highcharts("chart4").SetOptions(New Helpers.GlobalOptions() With { _
        .[Global] = New [Global]() With { _
                .UseUTC = False _
            } _
        }).InitChart(New Chart() With { _
         .DefaultSeriesType = ChartTypes.Spline, _
         .MarginRight = 10, _
         .Events = New ChartEvents() With { _
          .Load = "ChartEventsLoad" _
         } _
        }).SetTitle(New Title() With { _
         .Text = "Live data" _
        }).SetXAxis(New XAxis() With { _
         .Type = AxisTypes.Datetime, _
         .TickPixelInterval = 150 _
        }).SetSeries(New Series() With { _
             .Data = New Helpers.Data(New Object() {})
            }) _
    .AddJavascripVariable("counter", "0") _
    .AddJavascripVariable("stockData", iterateData.ToString) _
    .AddJavascripFunction("ChartEventsLoad", "// set up the updating of the chart each second" & vbCr & vbLf & _
                          " var result = stockData.data;" & vbCr & vbLf & _
                          " var series = this.series[0];" & vbCr & vbLf & _
                          " setInterval(function() {" & vbCr & vbLf & _
                          " var p = String(result[counter]);" & vbCr & vbLf & _
                          " var splitp = p.split("","");" & vbCr & vbLf & _
                          " var x = splitp[0];" & vbCr & vbLf & _
                          " var y = splitp[1];" & vbCr & vbLf & _
                          " series.addPoint([x, y], true, false, true);" & vbCr & vbLf & _
                          " counter++;" & vbCr & vbLf & _
                          "}, 1000);")

    ltrChart4.Text = chart4.ToHtmlString()

如果我查看firebug中的x和y值，我可以看到这些是预期的值。但是，我的图表只是在x轴上的时间从〜1900小时开始更新，并且每秒增加一个点（按照javascript函数），但是没有y值。另外，y轴似乎从-2.5开始 - 我使用的值都不到1000，更不用说0.我非常接近......

Answer 1

终于搞定了。这是我的解决方案 - 可能不是最漂亮的但它有效。 重要的是传递iterated iterateData.ToString()。从这一点开始，您可以遍历它，然后在每个元素上进行拆分。我添加了一个检查，以确保一旦到达数据集中的最后一个点，就会停止添加点。要做的仍然是允许它处理多个系列并“播放”它们。

    Dim stfipsList4 = (From r In dt4.AsEnumerable() Select r("areaname")).Distinct().ToList()
    Dim SeriesList4 As New List(Of Series)(stfipsList4.Count)
    Dim seriesItem4(stfipsList4.Count) As Series
    Dim xDate4 As DateTime
    Dim fakeDate4 As String
    Dim sX4 As Integer

    sX4 = 1
    For Each state In stfipsList4
        Dim data As New Dictionary(Of DateTime, Decimal)
        Dim stateVal As String = state.ToString
        Dim recCount As Integer = dt4.Rows.Count - 1
        Dim seriesPointCount As Integer = dt4.Compute("Count(population)", "areaname = '" + stateVal + "'")
        Dim chartData As Object(,) = New Object(seriesPointCount - 1, 1) {}
        Dim x As Integer = 0
        For i As Integer = 0 To recCount
            If dt4.Rows(i)("areaname").ToString = stateVal Then
                fakeDate4 = "1/1/" + dt4.Rows(i)("periodyear").ToString
                xDate3 = DateTime.Parse(fakeDate4)
                chartData.SetValue(xDate4.Date, x, 0)
                chartData.SetValue(dt4.Rows(i)("population"), x, 1)
                x += 1
            End If

        Next

        seriesItem4(sX4) = New Series With {
                    .Name = state.ToString, _
                    .Data = New Helpers.Data(chartData)
        }

        SeriesList4.Add(seriesItem3(sX4))

        sX4 = sX4 + 1
    Next

    Dim iterateData As String = JsonSerializer.Serialize(seriesItem3(1))

    Dim chart4 As Highcharts = New Highcharts("chart4").SetOptions(New Helpers.GlobalOptions() With { _
        .[Global] = New [Global]() With { _
                .UseUTC = False _
            } _
        }).InitChart(New Chart() With { _
         .DefaultSeriesType = ChartTypes.Column, _
         .MarginRight = 10, _
         .Events = New ChartEvents() With { _
          .Load = "ChartEventsLoad" _
         } _
        }).SetTitle(New Title() With { _
         .Text = "Live data" _
        }).SetXAxis(New XAxis() With { _
         .Type = AxisTypes.Datetime, _
         .TickPixelInterval = 150 _
        }).SetSeries(New Series() With { _
             .Data = New Helpers.Data(New Object() {}), _
             .Name = seriesItem3(1).Name
            }) _
    .AddJavascripVariable("iterated", iterateData.ToString) _
    .AddJavascripFunction("ChartEventsLoad", "// set up the updating of the chart each second" & vbCr & vbLf & _
                          " var result = iterated.data;" & vbCr & vbLf & _
                          " var counter = 0;" & vbCr & vbLf & _
                          " var series = this.series[0];" & vbCr & vbLf & _
                          " var loopseries = function() {" & vbCr & vbLf & _
                          " if (counter <= result.length) {" & vbCr & vbLf & _
                          " var p = String(result[counter]);" & vbCr & vbLf & _
                          " var splitp = p.split("","");" & vbCr & vbLf & _
                          " var x = Number(splitp[0]);" & vbCr & vbLf & _
                          " var y = Number(splitp[1]);" & vbCr & vbLf & _
                          " series.addPoint([x, y], true, series.points.length > 10, true);" & vbCr & vbLf & _
                          " counter++;" & vbCr & vbLf & _
                          " } else {" & vbCr & vbLf & _
                          " clearInterval(loopseries);" & vbCr & vbLf & _
                          " }};" & vbCr & vbLf & _
                          " setInterval(loopseries, 100);")

    ltrChart4.Text = chart4.ToHtmlString()

Answer 2

您可以在sample project

的DotNet.Highchart project看到“每秒更新样条线”的演示

无论如何，这里是一个示例代码，您可以在迭代数据时每秒在图表中添加点数：

Highcharts chart = new Highcharts("chart")
            .SetOptions(new GlobalOptions { Global = new Global { UseUTC = false } })
            .InitChart(new Chart
                       {
                           DefaultSeriesType = ChartTypes.Spline,
                           MarginRight = 10,
                           Events = new ChartEvents
                                    {
                                        Load = "ChartEventsLoad"
                                    }
                       })
            .SetTitle(new Title { Text = "Live data" })
            .SetXAxis(new XAxis
                      {
                          Type = AxisTypes.Datetime,
                          TickPixelInterval = 150
                      })
            .SetSeries(new Series
                       {
                           Name = "Live data",
                           Data = new Data(new[] { new Point { X = Tools.GetTotalMilliseconds(DateTime.Now), Y = 0 } })
                       })
            .AddJavascripVariable("counter", "0")
            .AddJavascripVariable("stockData", JsonSerializer.Serialize(ChartsData.StockData))
            .AddJavascripFunction("ChartEventsLoad",
                                  @"// set up the updating of the chart each second
                                   var series = this.series[0];
                                   setInterval(function() {
                                      var x = (new Date()).getTime(); // current time
                                      var y = stockData[counter];
                                      series.addPoint([x, y], true, series.points.length > 10);
                                      counter++;
                                   }, 1000);");

对不起C＃代码。我希望这很有用，你可以找到好转换器。