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使用Chart.js创建多折线图

田远
2023-03-14

我正在尝试使用图表创建多行图表。js

我可以使用固定的数据结构对1行和2行执行此操作,但我无法使用多行来显示传递给数据结构的数据。

下面是从图表中缩写出来的示例用法。js网站

http://www.chartjs.org/docs/#getting-started

  var myLineChart = new Chart(ctx).Line(data);
  var data = {
      labels: ["January", "February", "March", "April", "May", "June", "July"],
      datasets: [
          {fillColor: "rgba(220,220,220,0.2)",
           strokeColor: "rgba(220,220,220,1)",
           data: [65, 59, 80, 81, 56, 55, 40]
          },
          {fillColor: "rgba(151,187,205,0.2)",
           strokeColor: "rgba(151,187,205,1)",
           data: [28, 48, 40, 19, 86, 27, 90]
          }
      ]};

现在我的代码,

   lineChartData = {};             //declare an object
   lineChartData.labels  = [];    //add 'labels' element to object (X axis)
   lineChartData.datasets = [];  //add 'datasets' array element to object

        dataset = {};       //a single dataset is an object
           dataset.fillColor = "rgba(0,0,0,0)";    
           dataset.strokeColor = "rgba(200,200,200,1)";  
           dataset.data = [];  //contains the 'Y; axis data

 for (line = 0; line < 4; line++) {
       y = [];
       lineChartData.datasets.push(dataset); //create a new line dataset

     for (x = 0; x < 10; x++) {
       y.push(line + x); //push some data aka generate 4 distinct separate lines
       lineChartData.labels += x; //adds x axis labels
     } //for x

      lineChartData.datasets[line].data = y; //send new line data to dataset
 } //for line

        ctx = document.getElementById("Chart1").getContext("2d");
        myLineChart = new Chart(ctx).Line(lineChartData);
    }

图表始终显示相同的最后生成的行4次。

我是javascript新手,我确信我在创建对象结构时犯了一些错误,我花了一天的时间试图解决这个问题

有一个chart.js选项添加值如下,我应该使用这个

.添加数据(值数组、标签

共有2个答案

康文昌
2023-03-14
 <script type="text/javascript">
            $(document).ready(function () {
                debugger;
                $.ajax({
                    type: "POST",
                    contentType: "application/json; charset=utf-8",
                    url: "CampComparison.aspx/getLineChartDataload",
                    data:{},
                    async: true,
                    cache: false,
                    dataType: "json",
                    success: OnSuccess_,
                    error: OnErrorCall_
                })

                function OnSuccess_(reponse) {

                    var aData = reponse.d;
                    var aLabels = aData[0];
                    var aDatasets1 = aData[1];
                    var aDatasets2 = aData[2];
                    var aDatasets3 = aData[3];
                    var aDatasets4 = aData[4];
                    var aDatasets5 = aData[5];

                    var lineChartData = {
                        labels: aLabels,
                        datasets: [
                            {
                                label: "Data1",
                                //fill:false,
                                fillColor: "rgba(0,0,0,0)",
                                strokeColor: "rgba(220,220,220,1)",
                                pointColor: "rgba(200,122,20,1)",

                                data: aDatasets1
                            },
                            {
                                label: "Data2",
                                fillColor: 'rgba(0,0,0,0)',
                                strokeColor: 'rgba(220,180,0,1)',
                                pointColor: 'rgba(220,180,0,1)',
                                data: aDatasets2
                            },
                            {

                                label: "Data5",
                                fillColor: "rgba(0,0,0,0)",
                                strokeColor: "rgba(151,187,205,1)",
                                pointColor: "rgba(152,188,204,1)",
                                data: aDatasets3
                            },

                            {
                                label: "Data4",
                                fillColor: 'rgba(0,0,0,0)',
                                strokeColor: 'rgba(151,187,205,1)',
                                pointColor: 'rgba(151,187,205,1)',
                                data: aDatasets4
                            },
                            {
                                label: "Data4",
                                fillColor: 'rgba(0,0,0,0)',
                                strokeColor: 'rgba(151,187,205,1)',
                                pointColor: 'rgba(151,187,205,1)',

                                data: aDatasets5
                            },


                        ]
                    }
                    Chart.defaults.global.animationSteps = 50;
                    Chart.defaults.global.tooltipYPadding = 16;
                    Chart.defaults.global.tooltipCornerRadius = 0;
                    Chart.defaults.global.tooltipTitleFontStyle = "normal";
                    Chart.defaults.global.tooltipFillColor = "rgba(0,160,0,0.8)";
                    Chart.defaults.global.animationEasing = "easeOutBounce";
                    Chart.defaults.global.responsive = true;
                    Chart.defaults.global.scaleLineColor = "black";
                    Chart.defaults.global.scaleFontSize = 16;
                    //lineChart.destroy();
                    //document.getElementById("canvas").innerHTML = '&nbsp;';
                    //document.getElementById("chartContainer").innerHTML = '&nbsp;';
                    //document.getElementById("chartContainer").innerHTML = '<canvas id="canvas" style="width: 650px; height: 350px;"></canvas>';
                   //var ctx = document.getElementById("canvas").getContext("2d");
                    //ctx.innerHTML = "";
                    //var pieChartContent = document.getElementById('pieChartContent');
                    //pieChartContent.innerHTML = '&nbsp;';
                    //$('#pieChartContent').append('<canvas id="canvas" width="650px" height="350px"><canvas>');

                    //ctx = $("#canvas").get(0).getContext("2d");
                   var ctx = document.getElementById("canvas").getContext("2d");
                    var lineChart = new Chart(ctx).Line(lineChartData, {

                        bezierCurve: true,
                        chartArea: { width: '62%' },
                        responsive: true,
                        pointDotRadius: 10,
                        scaleShowVerticalLines: false,
                        scaleGridLineColor: 'black'


                    });
                }
                function OnErrorCall_(repo) {
                    //alert(repo);
                }
            });

            //});

             </script>
C#code
--------
    [WebMethod(EnableSession = true)]
        public static List<object> getLineChartDataload()
        {
            List<object> iData = new List<object>();
            List<string> labels = new List<string>();
            string advertiserid = HttpContext.Current.Session["AccountID"].ToString();
            if (!string.IsNullOrEmpty(advertiserid))
            {
               // string StartDate = DateTime.Now.AddDays(-180).ToString("yyyy-MM-dd");
                string StartDate = DateTime.Now.AddDays(-60).ToString("yyyy-MM-dd");
                string EndDate = DateTime.Now.ToString("yyyy-MM-dd");
                string strcampaignid = string.Empty;
                DataTable dt = new DataTable();
                int i = 0;
                chatBL objcampid = new chatBL();
                string query = "select distinct top 3 Campaignid,CampaignName from campaign where advertiserid='" + advertiserid + "' order by CampaignName";
                dt = objcampid.commonFuntionGetData2(query);
                foreach (DataRow drow in dt.Rows)
                {
                    strcampaignid += drow["Campaignid"].ToString() + ",";
                }
                if (!string.IsNullOrEmpty(strcampaignid))
                {
                    strcampaignid = strcampaignid.Substring(0, strcampaignid.Length - 1);
                }
                string[] campaignid = strcampaignid.Split(',');


                //First get distinct Month Name for select Year.
                // string query1 = "select top 10 cast(createddatetime as date) as month_name from advertiser where CurrentBal>0 order by CurrentBal";
                //query1 += " ";
                // query1 += " order by month_number;";
                foreach (string strcamp in campaignid)
                {

                    if (i == 0)
                    {
                        chatBL objblabel = new chatBL();
                        // DataTable dtLabels = objblabel.Topupmonthly("5E8EF1E9-67BF-489C-84CB-AFF0BB0FE707", "2015-09-18", "2016-02-25", "months");
                        DataTable dtLabels = objblabel.Topupmonthly2(strcamp, StartDate, EndDate, "months");
                        foreach (DataRow drow in dtLabels.Rows)
                        {
                            labels.Add(drow["InsDateTime"].ToString().Substring(2, 7));
                        }
                        iData.Add(labels);
                    }


                    // string query_DataSet_1 = "select top 10 CurrentBal from advertiser where CurrentBal>0 order by CurrentBal";
                    //query_DataSet_1 += " (orders_quantity) as total_quantity  from mobile_sales  ";
                    //query_DataSet_1 += " where YEAR(orders_date)='" + year + "' and  mobile_id='" + mobileId_one + "'  ";
                    //query_DataSet_1 += " group by   month(orders_date) ";
                    //query_DataSet_1 += " order by  month_number  ";


                    chatBL objbl = new chatBL();
                    DataTable dtDataItemsSets_1 = objbl.Topupmonthly2(strcamp, StartDate, EndDate, "months");
                    List<double> lst_dataItem_1 = new List<double>();
                    foreach (DataRow dr in dtDataItemsSets_1.Rows)
                    {
                        lst_dataItem_1.Add(Convert.ToDouble(dr["CPACOUNT"].ToString()));
                    }
                    iData.Add(lst_dataItem_1);

                    //string query_DataSet_2 = "select top 10 Totalspent from advertiser where CurrentBal>0 order by CurrentBal";
                    //query_DataSet_2 += " (orders_quantity) as total_quantity  from mobile_sales  ";
                    //query_DataSet_2 += " where YEAR(orders_date)='" + year + "' and  mobile_id='" + mobileId_two + "'  ";
                    //query_DataSet_2 += " group by   month(orders_date) ";
                    //query_DataSet_2 += " order by  month_number  ";

                    //chatBL objbl1 = new chatBL();
                    //DataTable dtDataItemsSets_2 = objbl1.Topupmonthly("5E8EF1E9-67BF-489C-84CB-AFF0BB0FE707", "2015-09-18", "2016-02-25", "months");
                    //List<double> lst_dataItem_2 = new List<double>();
                    //foreach (DataRow dr in dtDataItemsSets_2.Rows)
                    //{
                    //    lst_dataItem_2.Add(Convert.ToDouble(dr["CPACOUNT"].ToString()));
                    //}
                    //iData.Add(lst_dataItem_2);
                    i = i + 1;
                }
            }
            return iData;
        }        
章稳
2023-03-14

您正在创建在数据集的所有4个位置插入相同对象(数据集)。所以循环中的任何操作都是在所有数组元素上完成的(实际上更准确的说法是,它是在数据集上完成的,数据集在数组的所有4个索引上)

请注意,在下面的代码中,{}对象文字实际上被插入数组4次,每次都给您一个新的元素。

lineChartData = {}; //declare an object
lineChartData.labels = []; //add 'labels' element to object (X axis)
lineChartData.datasets = []; //add 'datasets' array element to object

for (line = 0; line < 4; line++) {
    y = [];
    lineChartData.datasets.push({}); //create a new line dataset
    dataset = lineChartData.datasets[line]
    dataset.fillColor = "rgba(0,0,0,0)";
    dataset.strokeColor = "rgba(200,200,200,1)";
    dataset.data = []; //contains the 'Y; axis data

    for (x = 0; x < 10; x++) {
        y.push(line + x); //push some data aka generate 4 distinct separate lines
        if (line === 0)
            lineChartData.labels.push(x); //adds x axis labels
    } //for x

    lineChartData.datasets[line].data = y; //send new line data to dataset
} //for line

ctx = document.getElementById("Chart1").getContext("2d");
myLineChart = new Chart(ctx).Line(lineChartData);

// for chart.js 2.0 the following will be to create `myLineChart`
// myLineChart = new Chart(ctx1, {
//      type: 'line',
//      data: lineChartData,
// });

我还为你的标签做了一个小改动-你只需要一套标签。

打个比方,原始代码就是这样做的

Series a = new Series()
Array chartData = []
for (var i = 0; i < 4; i++) {
    chartData.add(a);
    -- some modifications on a ---
}

最后,基本上有一个数组,其中有4个指针指向同一个对象a

小提琴-http://jsfiddle.net/tk78bosy/

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