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Donut Chart with center label

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Chart (HTML5)
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Jorge
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Jorge asked on 29 Oct 2015, 05:56 PM

Hi!

 Is it possible to set the greater value on the center of the donut? The goal is to reach something like picture attached. Thanks in advance for any help

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Danail Vasilev
Telerik team
answered on 30 Oct 2015, 11:58 AM
Hello,

The desired functionality is not supported by the donut chart out of the box. You can, however, create a label that has an absolute position over the donut and set its value according to the target donut value. For example:

<head runat="server">
    <title></title>
    <style type="text/css">
        .Label1 {
            position: absolute;
            color: white;
            font-weight: bold;
            font-size: 40px;
            top: 110px;
            left: 93px;
        }
    </style>
    <telerik:RadCodeBlock ID="RadCodeBlock1" runat="server">
        <script type="text/javascript">
            function pageLoad() {
                updateDonutAndLabel();
            }
            function updateDonutAndLabel() {
                //generate random value
                var randNum = function (min, max) {
                    return Math.floor(Math.random() * (max - min + 1)) + min;
                }
                var currValue = randNum(0, 33);
 
                //set random value to the chart
                var chart = $find('<%=RadHtmlChart1.ClientID%>')
                chart._chartObject.options.series[0].data[0].value = currValue;
                chart._chartObject.options.series[0].data[1].value = 100 - currValue;
 
                //Set hole size and remove gradient
                chart._chartObject.options.series[0].holeSize = 60;
                chart._chartObject.options.series[0].overlay = { gradient: "none" };
                chart.repaint();
 
                //set the current value to the label
                var label = $get("<%=Label1.ClientID %>");
                label.textContent = currValue + " %";
            }
        </script>
    </telerik:RadCodeBlock>
</head>
<body>
    <form id="form1" runat="server">
        <telerik:RadScriptManager ID="RadScriptManager1" runat="server">
        </telerik:RadScriptManager>
        <telerik:RadHtmlChart ID="RadHtmlChart1" runat="server" Width="250px" Height="250px">
            <Appearance FillStyle-BackgroundColor="#C87545"></Appearance>
            <PlotArea>
                <Series>
                    <telerik:DonutSeries>
                        <LabelsAppearance Visible="false"></LabelsAppearance>
                        <SeriesItems>
                            <telerik:PieSeriesItem Y="0" Name="Item1" BackgroundColor="#FFC700" />
                            <telerik:PieSeriesItem Y="0" Name="Item2" BackgroundColor="#6E443D" />
                        </SeriesItems>
                    </telerik:DonutSeries>
                </Series>
            </PlotArea>
            <Legend>
                <Appearance Visible="false"></Appearance>
            </Legend>
        </telerik:RadHtmlChart>
        <asp:Label ID="Label1" Text="10" runat="server" CssClass="Label1" />
        <br />
        <telerik:RadButton ID="RadButton1" runat="server" AutoPostBack="false" OnClientClicked="updateDonutAndLabel" Text="Update Donut and Label" />
    </form>
</body>
</html>

I have also created a code library with this example here - http://www.telerik.com/support/code-library/put-label-in-donut-chart-center

Regards,
Danail Vasilev
Telerik
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Jorge
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answered on 30 Oct 2015, 10:43 PM
Thanks a lot. I'll try it right away! It would be great if you consider something like this for future releases, that behavior is kind of common in some graph components (javascript the most of them), but would be really great to have it on telerik. Thanks again
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Chart (HTML5)
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Jorge
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Danail Vasilev
Telerik team
Jorge
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