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Data Label in ASP.NET Core Accumulation Chart control

Data label can be added to a chart series by enabling the visible option in the dataLabel property.

tagHelper
default.cs
<ejs-accumulationchart id="container" title="Mobile Browser Statistics" enableSmartLabels="true">
            <e-accumulationchart-legendsettings visible="false">
            </e-accumulationchart-legendsettings>
            <e-accumulation-series-collection>
                <e-accumulation-series dataSource="ViewBag.dataSource" xName="xValue" yName="yValue" name="Browser">
                 <e-accumulationseries-datalabel name="text" visible="true">
                  </e-accumulationseries-datalabel>
                </e-accumulation-series>
            </e-accumulation-series-collection>
        </ejs-accumulationchart>
public ActionResult Index()
        {
            List<PieChartData> chartData = new List<PieChartData>
            {

                new PieChartData { xValue = "Chrome", yValue = 37, text = "37%", fill="#498fff"},
                new PieChartData { xValue = "UC Browser", yValue = 17, text = "17%", fill="#ffa060"},
                new PieChartData { xValue = "iPhone", yValue = 19, text = "19%", fill="#ff68b6"},
                new PieChartData { xValue = "Others", yValue = 4 , text = "4%", fill="#81e2a1"},
            };
            ViewBag.dataSource = chartData;
            return View();
        }
         public class PieChartData
        {
            public string xValue;
            public double yValue;
            public string text;
            public string fill;
        }

Positioning

Accumulation chart provides support for placing the data label either inside or outside the chart.

tagHelper
position.cs
<ejs-accumulationchart id="container" title="Mobile Browser Statistics">
                    <e-accumulationchart-legendsettings visible="false">
                    </e-accumulationchart-legendsettings>
                    <e-accumulation-series-collection>
                        <e-accumulation-series dataSource="ViewBag.dataSource" xName="xValue" yName="yValue" name="Browser">
                            <e-accumulationseries-datalabel name="text" visible="true" position="Outside">
                            </e-accumulationseries-datalabel>
                        </e-accumulation-series>
                    </e-accumulation-series-collection>
                </ejs-accumulationchart>
public ActionResult Index()
        {
            List<PieChartData> chartData = new List<PieChartData>
            {

                new PieChartData { xValue = "Chrome", yValue = 37, text = "37%", fill="#498fff"},
                new PieChartData { xValue = "UC Browser", yValue = 17, text = "17%", fill="#ffa060"},
                new PieChartData { xValue = "iPhone", yValue = 19, text = "19%", fill="#ff68b6"},
                new PieChartData { xValue = "Others", yValue = 4 , text = "4%", fill="#81e2a1"},
            };
            ViewBag.dataSource = chartData;
            return View();
        }
        public class PieChartData
        {
            public string xValue;
            public double yValue;
            public string text;
            public string fill;
        }

Smart Labels

Datalabels will be arranged smartly without overlapping with each other. You can enable or disable this feature using the enableSmartLabels property.

tagHelper
smartlabels.cs
<ejs-accumulationchart id="container" title="Mobile Browser Statistics" enableSmartLabels="true">
            <e-accumulationchart-legendsettings visible="false">
            </e-accumulationchart-legendsettings>
            <e-accumulation-series-collection>
                <e-accumulation-series dataSource="ViewBag.dataSource" xName="xValue" yName="yValue" name="Browser">
               <e-accumulationseries-datalabel name="text" visible="true" position="Outside">
                </e-accumulationseries-datalabel>
                </e-accumulation-series>
            </e-accumulation-series-collection>
        </ejs-accumulationchart>
public ActionResult Index()
        {
            List<PieChartData> chartData = new List<PieChartData>
            {

                new PieChartData { xValue = "Chrome", yValue = 37, text = "37%", fill="#498fff"},
                new PieChartData { xValue = "UC Browser", yValue = 17, text = "17%", fill="#ffa060"},
                new PieChartData { xValue = "iPhone", yValue = 19, text = "19%", fill="#ff68b6"},
                new PieChartData { xValue = "Others", yValue = 4 , text = "4%", fill="#81e2a1"},
            };
            ViewBag.dataSource = chartData;
             return View();
        }
        public class PieChartData
        {
            public string xValue;
            public double yValue;
            public string text;
            public string fill;
        }

Data Label Template

Label content can be formatted by using the template option. Inside the template, you can add the placeholder text ${point.x} and ${point.y} to display corresponding data points x & y value. Using template property, you can set data label template in chart.

tagHelper
template.cs
@section ControlsSection{
      <ejs-accumulationchart id="container" title="Mobile Browser Statistics" enableSmartLabels="true">
                    <e-accumulationchart-legendsettings visible="false">
                    </e-accumulationchart-legendsettings>
                    <e-accumulation-series-collection>
                        <e-accumulation-series dataSource="ViewBag.dataSource" xName="xValue" yName="yValue" name="Browser">
                            <e-accumulationseries-datalabel name="text" visible="true" position="Inside" 
                                                   template="<div id='templateWrap' style='background-color:#bd18f9;border-radius: 3px; float: right;padding: 2px;line-height: 20px;text-align: center;'>"+ "<img src='sun_annotation.png' />" + "<div style='color:white; font-family:Roboto; font-style: medium; fontp-size:14px;float: right;padding: 2px;line-height: 20px;text-align: center;padding-right:6px'><span>${point.y}</span></div></div>">
                            </e-accumulationseries-datalabel>
                        </e-accumulation-series>
                    </e-accumulation-series-collection>
                </ejs-accumulationchart>
 }
public ActionResult Index()
        {
            List<PieChartData> chartData = new List<PieChartData>
            {

                new PieChartData { xValue = "Chrome", yValue = 37, text = "37%", fill="#498fff"},
                new PieChartData { xValue = "UC Browser", yValue = 17, text = "17%", fill="#ffa060"},
                new PieChartData { xValue = "iPhone", yValue = 19, text = "19%", fill="#ff68b6"},
                new PieChartData { xValue = "Others", yValue = 4 , text = "4%", fill="#81e2a1"},
            };
            ViewBag.dataSource = chartData;
            return View();
        }
        public class PieChartData
        {
            public string xValue;
            public double yValue;
             public string text;
            public string fill;
        }

Connector Line

Connector line will be visible when the data label is placed outside the chart. The connector line can be customized using the type, color, width, length and dashArray properties

tagHelper
connector.cs
<ejs-accumulationchart id="container" title="Mobile Browser Statistics" enableSmartLabels="true">
                    <e-accumulationchart-legendsettings visible="false">
                    </e-accumulationchart-legendsettings>
                     <e-accumulation-series-collection>
                          <e-accumulation-series dataSource="ViewBag.dataSource" xName="xValue" yName="yValue" name="Browser">
                            <e-accumulationseries-datalabel name="text" visible="true" position="Outside" >
                                <e-connectorstyle color="#f4429e" length="50px" width="2" type="Curve" dashArray="5,3">
                                    </e-connectorstyle>
                            </e-accumulationseries-datalabel>
                        </e-accumulation-series>
                    </e-accumulation-series-collection>
                   
                </ejs-accumulationchart>
public ActionResult Index()
        {
            List<PieChartData> chartData = new List<PieChartData>
            {

                new PieChartData { xValue = "Chrome", yValue = 37, text = "37%", fill="#498fff"},
                new PieChartData { xValue = "UC Browser", yValue = 17, text = "17%", fill="#ffa060"},
                new PieChartData { xValue = "iPhone", yValue = 19, text = "19%", fill="#ff68b6"},
                new PieChartData { xValue = "Others", yValue = 4 , text = "4%", fill="#81e2a1"},
            };
            ViewBag.dataSource = chartData;
             return View();
        }
         public class PieChartData
        {
            public string xValue;
            public double yValue;
            public string text;
            public string fill;
        }

Text Mapping

Text from the data source can be mapped to data label using name property.

tagHelper
map.cs
<ejs-accumulationchart id="container" title="Mobile Browser Statistics">
            <e-accumulationchart-legendsettings visible="false">
            </e-accumulationchart-legendsettings>
            <e-accumulation-series-collection>
                <e-accumulation-series dataSource="ViewBag.dataSource" xName="xValue" yName="yValue" name="Browser">
                  <e-accumulationseries-datalabel name="text" visible="true" >
                     </e-accumulationseries-datalabel>
                </e-accumulation-series>
            </e-accumulation-series-collection>
        </ejs-accumulationchart>
public ActionResult Index()
        {
            List<PieChartData> chartData = new List<PieChartData>
            {

                new PieChartData { xValue = "Chrome", yValue = 37, text = "37%", fill="#498fff"},
                new PieChartData { xValue = "UC Browser", yValue = 17, text = "17%", fill="#ffa060"},
                new PieChartData { xValue = "iPhone", yValue = 19, text = "19%", fill="#ff68b6"},
                new PieChartData { xValue = "Others", yValue = 4 , text = "4%", fill="#81e2a1"},
            };
            ViewBag.dataSource = chartData;
            return View();
        }
        public class PieChartData
        {
            public string xValue;
            public double yValue;
            public string text;
            public string fill;
        }

Customization

Individual text can be customized using the textRender event.

tagHelper
custom.cs
<ejs-accumulationchart id="container" title="Mobile Browser Statistics" textRender="textRender">
                    <e-accumulationchart-legendsettings visible="false">
                    </e-accumulationchart-legendsettings>
                    <e-accumulation-series-collection>
                        <e-accumulation-series dataSource="ViewBag.dataSource" xName="xValue" yName="yValue" name="Browser"
                                               pointColorMapping="fill">
                            <e-accumulationseries-datalabel name="text" visible="true" position="Outside">
                            </e-accumulationseries-datalabel>
                        </e-accumulation-series>
                    </e-accumulation-series-collection>
                </ejs-accumulationchart>
 
 <script>
            var textRender = function (args) {
                if ((args.point.x).indexOf("iPhone") > -1) {
                    args.color = 'red';
                    args.border.width = 1;
                }
            };
</script>
public ActionResult Index()
        {
            List<PieChartData> chartData = new List<PieChartData>
            {

                new PieChartData { xValue = "Chrome", yValue = 37, text = "37%", fill="#498fff"},
                new PieChartData { xValue = "UC Browser", yValue = 17, text = "17%", fill="#ffa060"},
                new PieChartData { xValue = "iPhone", yValue = 19, text = "19%", fill="#ff68b6"},
                new PieChartData { xValue = "Others", yValue = 4 , text = "4%", fill="#81e2a1"},
            };
            ViewBag.dataSource = chartData;
            return View();
        }
        public class PieChartData
        {
            public string xValue;
            public double yValue;
            public string text;
            public string fill;
        }
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