Data Labels in ASP.NET MVC Chart
19 Dec 202224 minutes to read
Data label can be added to a chart series by enabling the Visible
option in the dataLabel. By default, the labels will arrange smartly without overlapping.
@Html.EJS().Chart("container").Series(series =>
{
series.Type(Syncfusion.EJ2.Charts.ChartSeriesType.Column).
Marker(mr=> mr.Visible(true).DataLabel(dl=>dl.Visible(true))).
XName("x").
YName("y").
DataSource(ViewBag.dataSource). Name("Gold").Width(2).Add();
}).PrimaryXAxis(px => px.Interval(1).ValueType(Syncfusion.EJ2.Charts.ValueType.Category)).Title("Olympic Medal Counts - RIO").Render()
public ActionResult Index()
{
List<Data> chartData = new List<Data>
{
new Data{ x= "Jan", y= 3, fill= "#498fff", text= "January" },
new Data{ x= "Feb", y= 3.5, fill= "#ffa060", text= "February" },
new Data{ x= "Mar", y= 7, fill= "#ff68b6", text= "March" },
new Data{ x= "Apr", y= 13.5,fill= "#81e2a1", text= "April" }
};
ViewBag.dataSource = chartData;
return View();
}
public class Data
{
public string x;
public double y;
public string fill;
public string text;
}
Position
Using Position
property, you can place the label either on Top
, Middle
,Bottom
or Outer
(outer is applicable for column and bar type series).
@Html.EJS().Chart("container").Series(series =>
{
series.Type(Syncfusion.EJ2.Charts.ChartSeriesType.Column).
Marker(mr=> mr.Visible(false).DataLabel(dl=>dl.Visible(true).Position(Syncfusion.EJ2.Charts.LabelPosition.Middle))).
XName("x").
YName("y").
DataSource(ViewBag.dataSource).
Name("Gold").
Width(2).Add();
}).PrimaryXAxis(px => px.Interval(1).ValueType(Syncfusion.EJ2.Charts.ValueType.Category)).Title("Olympic Medal Counts - RIO").Render()
public ActionResult Index()
{
List<Data> chartData = new List<Data>
{
new Data{ x= "Jan", y= 3, fill= "#498fff", text= "January" },
new Data{ x= "Feb", y= 3.5, fill= "#ffa060", text= "February" },
new Data{ x= "Mar", y= 7, fill= "#ff68b6", text= "March" },
new Data{ x= "Apr", y= 13.5,fill= "#81e2a1", text= "April" }
};
ViewBag.dataSource = chartData;
return View();
}
public class Data
{
public string x;
public double y;
public string fill;
public string text;
}
NOTE
The position
Outer
is applicable for column and bar type series.
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 ${point.y}
to display corresponding data points x & y value. Using Template
property, you can set data label template in chart.
<div id="ControlRegion">
@Html.EJS().Chart("container").Series(series =>
{
series.Type(Syncfusion.EJ2.Charts.ChartSeriesType.Column).
Marker(mr=> mr.Visible(false).DataLabel(dl=>dl.Visible(true).Position(Syncfusion.EJ2.Charts.LabelPosition.Middle).Template("#template"))).
XName("x").
YName("y").
DataSource(ViewBag.dataSource).
Name("Gold").
Width(2).Add();
}).PrimaryXAxis(px => px.Interval(1).ValueType(Syncfusion.EJ2.Charts.ValueType.Category)).Title("Olympic Medal Counts - RIO").Render()
<script id="template">
<div style="background:#f5f5f5; border: 1px solid black; padding: 3px 3px 3px 3px">
<div>${point.x}</div>
<div>${point.y}</div>
</div>
</script>
public ActionResult Index()
{
List<Data> chartData = new List<Data>
{
new Data{ x= "Jan", y= 3, fill= "#498fff", text= "January" },
new Data{ x= "Feb", y= 3.5, fill= "#ffa060", text= "February" },
new Data{ x= "Mar", y= 7, fill= "#ff68b6", text= "March" },
new Data{ x= "Apr", y= 13.5,fill= "#81e2a1", text= "April" }
};
ViewBag.dataSource = chartData;
return View();
}
public class Data
{
public string x;
public double y;
public string fill;
public string text;
}
Text Mapping
Text from the data source can be mapped using Name
property.
@Html.EJS().Chart("container").Series(series =>
{
@Html.EJS().Chart("container").Series(series =>
{
series.Type(Syncfusion.EJ2.Charts.ChartSeriesType.Column).
Marker(mr=> mr.Visible(false).DataLabel(dl=>dl.Visible(true).Name("text"))).
XName("x").
YName("y").
DataSource(ViewBag.dataSource).
Name("Gold").
Width(2).Add();
}).PrimaryXAxis(px => px.Interval(1).ValueType(Syncfusion.EJ2.Charts.ValueType.Category)).Title("Olympic Medal Counts - RIO").Render()
public ActionResult Index()
{
List<Data> chartData = new List<Data>
{
new Data{ x= "Jan", y= 3, fill= "#498fff", text= "January" },
new Data{ x= "Feb", y= 3.5, fill= "#ffa060", text= "February" },
new Data{ x= "Mar", y= 7, fill= "#ff68b6", text= "March" },
new Data{ x= "Apr", y= 13.5,fill= "#81e2a1", text= "April" }
};
ViewBag.dataSource = chartData;
return View();
}
public class Data
{
public string x;
public double y;
public string fill;
public string text;
}
Format
Data label for the chart can be formatted using Format
property. You can use the global formatting options, such as ‘n’, ‘p’, and ‘c’.
@Html.EJS().Chart("container").Series(series =>
{
@Html.EJS().Chart("container").Series(series =>
{
series.Type(Syncfusion.EJ2.Charts.ChartSeriesType.Column).
Marker(mr=> mr.Visible(false).DataLabel(dl=>dl.Visible(true).Format("n2"))).
XName("x").
YName("y").
DataSource(ViewBag.dataSource).
Name("Gold").
Width(2).Add();
}).PrimaryXAxis(px => px.Interval(1).ValueType(Syncfusion.EJ2.Charts.ValueType.Category)).Title("Olympic Medal Counts - RIO").Render()
public ActionResult Index()
{
List<Data> chartData = new List<Data>
{
new Data{ x= "Jan", y= 3, fill= "#498fff", text= "January" },
new Data{ x= "Feb", y= 3.5, fill= "#ffa060", text= "February" },
new Data{ x= "Mar", y= 7, fill= "#ff68b6", text= "March" },
new Data{ x= "Apr", y= 13.5,fill= "#81e2a1", text= "April" }
};
ViewBag.dataSource = chartData;
return View();
}
public class Data
{
public string x;
public double y;
public string fill;
public string text;
}
Value | Format | Resultant Value | Description |
---|---|---|---|
1000 | n1 | 1000.0 | The number is rounded to 1 decimal place. |
1000 | n2 | 1000.00 | The number is rounded to 2 decimal places. |
1000 | n3 | 1000.000 | The number is rounded to 3 decimal place. |
0.01 | p1 | 1.0% | The number is converted to percentage with 1 decimal place. |
0.01 | p2 | 1.00% | The number is converted to percentage with 2 decimal place. |
0.01 | p3 | 1.000% | The number is converted to percentage with 3 decimal place. |
1000 | c1 | $1000.0 | The currency symbol is appended to number and number is rounded to 1 decimal place. |
1000 | c2 | $1000.00 | The currency symbol is appended to number and number is rounded to 2 decimal place. |
Margin
Margin
for data label can be applied to using Left
, Right
, Bottom
and Top
properties.
@{
var border = new { width = 2, color = "red" };
var margin = new { left = 15, right = 15, bottom = 15, top = 15 };
}
@Html.EJS().Chart("container").Series(series =>
{
series.Type(Syncfusion.EJ2.Charts.ChartSeriesType.Column).
Marker(mr=> mr.Visible(false).DataLabel(dl=>dl.Visible(true).Border(border).Margin(margin))).
XName("x").
YName("y").
DataSource(ViewBag.dataSource).
Name("Gold").
Width(2).Add();
}).PrimaryXAxis(px => px.Interval(1).ValueType(Syncfusion.EJ2.Charts.ValueType.Category)).Title("Olympic Medal Counts - RIO").Render()
public ActionResult Index()
{
List<Data> chartData = new List<Data>
{
new Data{ x= "Jan", y= 3, fill= "#498fff", text= "January" },
new Data{ x= "Feb", y= 3.5, fill= "#ffa060", text= "February" },
new Data{ x= "Mar", y= 7, fill= "#ff68b6", text= "March" },
new Data{ x= "Apr", y= 13.5,fill= "#81e2a1", text= "April" }
};
ViewBag.dataSource = chartData;
return View();
}
public class Data
{
public string x;
public double y;
public string fill;
public string text;
}
Customization
stroke
and border
of data label can be customized using Fill
and Border
properties. Rounded corners can be customized using Rx
and Ry
properties.
@{
var border = new { width = 2, color = "red" };
var margin = new { left = 15, right = 15, bottom = 15, top = 15 };
}
@Html.EJS().Chart("container").Series(series =>
{
series.Type(Syncfusion.EJ2.Charts.ChartSeriesType.Column).
Marker(mr=> mr.Visible(false).DataLabel(dl=>dl.Visible(true).Border(border).Name("text").Rx(10).Ry(10).Fill("skyblue"))).
XName("x").
YName("y").
DataSource(ViewBag.dataSource).
Name("Gold").
Width(2).Add();
}).PrimaryXAxis(px => px.Interval(1).ValueType(Syncfusion.EJ2.Charts.ValueType.Category)).Title("Olympic Medal Counts - RIO").Render()
public ActionResult Index()
{
List<Data> chartData = new List<Data>
{
new Data{ x= "Jan", y= 3, fill= "#498fff", text= "January" },
new Data{ x= "Feb", y= 3.5, fill= "#ffa060", text= "February" },
new Data{ x= "Mar", y= 7, fill= "#ff68b6", text= "March" },
new Data{ x= "Apr", y= 13.5,fill= "#81e2a1", text= "April" }
};
ViewBag.dataSource = chartData;
return View();
}
public class Data
{
public string x;
public double y;
public string fill;
public string text;
}
NOTE
Rx
andRy
properties requiresBorder
values not to be null.
Customizing Specific Point
You can also customize the specific marker and label using PointRender
and TextRender
event. PointRender
event allows you to change the shape, color and border for a point, whereas the TextRender
event allows you to change the text for the point.
@Html.EJS().Chart("container").TextRender("textRender").PointRender("pointRender").Series(series =>
{
series.Type(Syncfusion.EJ2.Charts.ChartSeriesType.Column).
Marker(mr=> mr.Visible(false).DataLabel(dl=>dl.Visible(true))).
XName("x").
YName("y").
DataSource(ViewBag.dataSource).
Name("Gold").
Width(2).Add();
}).PrimaryXAxis(px => px.Interval(1).ValueType(Syncfusion.EJ2.Charts.ValueType.Category)).Title("Olympic Medal Counts - RIO").Render()
<script>
pointRender = function (args) {
if (args.point.index === 2) {
args.fill = 'red'
}
},
textRender = function (args) {
if (args.point.index === 2) {
args.text = 'Maximum Temperature';
args.color = 'red';
}
else {
args.cancel = true;
}
}
</script>
public ActionResult Index()
{
List<Data> chartData = new List<Data>
{
new Data{ x= "Jan", y= 3, fill= "#498fff", text= "January" },
new Data{ x= "Feb", y= 3.5, fill= "#ffa060", text= "February" },
new Data{ x= "Mar", y= 7, fill= "#ff68b6", text= "March" },
new Data{ x= "Apr", y= 13.5,fill= "#81e2a1", text= "April" }
};
ViewBag.dataSource = chartData;
return View();
}
public class Data
{
public string x;
public double y;
public string fill;
public string text;
}
Show percentage based on each series points
You can calculate the percentage value based on the sum for each series using the SeriesRender
and TextRender
events in the chart. In SeriesRender
calculate the sum of each series y values and In TextRender
calculate percentage value based on the sum value and modify the text.
<div class="control-section">
<div style="text-align:center">
@Html.EJS().Chart("container").TextRender("onTextRender").SeriesRender("onSeriesRender").Series(series =>
{
series.Type(Syncfusion.EJ2.Charts.ChartSeriesType.Column)
.Marker(mr => mr.DataLabel(dl => dl.Visible(true).Font(ff => ff.FontWeight("600").Color("#ffffff")).Position(Syncfusion.EJ2.Charts.LabelPosition.Top))).XName("x")
.YName("yValue").DataSource(ViewBag.dataSource1).Name("Gold").Width(2).Add();
series.Type(Syncfusion.EJ2.Charts.ChartSeriesType.Column)
.Marker(mr => mr.DataLabel(dl => dl.Visible(true).Font(ff => ff.FontWeight("600").Color("#ffffff")).Position(Syncfusion.EJ2.Charts.LabelPosition.Top))).XName("x").YName("yValue1").DataSource(ViewBag.dataSource2)
.Name("Silver").Width(2).Add();
series.Type(Syncfusion.EJ2.Charts.ChartSeriesType.Column)
.Marker(mr => mr.DataLabel(dl => dl.Visible(true).Font(ff => ff.FontWeight("600").Color("#ffffff")).Position(Syncfusion.EJ2.Charts.LabelPosition.Top))).XName("x")
.YName("yValue2").DataSource(ViewBag.dataSource3).Name("Brozen").Width(2).Add();
}).PrimaryYAxis(px => px.LabelStyle(ls => ls.Color("transparent")).LineStyle(ls => ls.Width(0)).MajorTickLines(mg => mg.Width(0))
.MajorGridLines(mg => mg.Width(0))
).PrimaryXAxis(px => px.Interval(1)
.ValueType(Syncfusion.EJ2.Charts.ValueType.Category).MajorGridLines(mg => mg.Width(0))
).Tooltip(tt => tt.Enable(true)).ChartArea(area => area.Border(br => br.Color("transparent"))
).LegendSettings(lg => lg.Visible(false)).Title("Olympic Medal Counts - RIO").Render()
</div>
</div>
<script>
var total = [];
function onSeriesRender(args) {
for (var i = 0; i < args.data.length; i++) {
if (!total[args.data[i].x]) total[args.data[i].x] = 0;
total[args.data[i].x] = total[args.data[i].x] + parseInt(args.data[i].y);
}
}
function onTextRender(args) {
var percentage = (parseInt(args.text) / total[args.point.x]) * 100;
percentage = percentage % 1 === 0 ? percentage : percentage.toFixed(2);
args.text = percentage + "%";
}
</script>
public ActionResult Index()
{
List<ColumnChartData> chartData1 = new List<ColumnChartData>
{
new ColumnChartData { x= "USA", y = 46 },
new ColumnChartData { x= "GBR", y = 27 },
new ColumnChartData { x= "CHN", y = 26 }
};
ViewBag.dataSource1 = chartData1;
List<ColumnChartData> chartData2 = new List<ColumnChartData>
{
new ColumnChartData { x= "USA", y = 37 },
new ColumnChartData { x= "GBR", y = 23 },
new ColumnChartData { x= "CHN", y = 18 }
};
ViewBag.dataSource2 = chartData2;
List<ColumnChartData> chartData3 = new List<ColumnChartData>
{
new ColumnChartData { x= "USA", y = 38 },
new ColumnChartData { x= "GBR", y = 17 },
new ColumnChartData { x= "CHN", y = 26 }
};
ViewBag.dataSource3 = chartData3;
return View();
}
public class ColumnChartData
{
public string x;
public double y;
}