CODEWITHSUNDEEP
kendo-uikendo-chart
Krulwich
Krulwich

Reputation: 51

Kendo want to add specific label for each graph point

I am using Kendo charts and want to add a specific label to each point on the graph, not related to the data value of that point, but rather a symbol relating to a qualitative property of that point.

In this code, I am able to customize the label on a per-series basis, where the default is an up-arrow, India is a *, and Russian Federation is a space. But it doesn't let me vary the label on a per-point basis within each series. Any way to do that? Any way to have an array of label values for each series, or something like that?

Thanks!

--Bruce

<!DOCTYPE html>
<html>
<head>
    <base href="http://demos.telerik.com/kendo-ui/bar-charts/column">
    <style>html { font-size: 14px; font-family: Arial, Helvetica, sans-serif; }</style>
    <title></title>
    <link rel="stylesheet" href="https://kendo.cdn.telerik.com/2017.2.504/styles/kendo.common-material.min.css" />
    <link rel="stylesheet" href="https://kendo.cdn.telerik.com/2017.2.504/styles/kendo.material.min.css" />
    <link rel="stylesheet" href="https://kendo.cdn.telerik.com/2017.2.504/styles/kendo.material.mobile.min.css" />

    <script src="https://kendo.cdn.telerik.com/2017.2.504/js/jquery.min.js"></script>
    <script src="https://kendo.cdn.telerik.com/2017.2.504/js/kendo.all.min.js"></script>
</head>
<body>
<div id="example">
    <div class="demo-section k-content wide">
        <div id="chart" style="background: center no-repeat url('../content/shared/styles/world-map.png');"></div>
    </div>
    <script>
        function createChart() {
            $("#chart").kendoChart({
                title: {
                    text: "Gross domestic product growth /GDP annual %/"
                },
                legend: {
                    position: "top"
                },
                seriesDefaults: {
                    type: "column",
                    labels: {template: "↑",
                             visible: true, color: 'red',
                                   position: "outsideEnd"}
                },
                series: [{
                    name: "India",
                    data: [3.907, 7.943, 7.848, 9.284, 9.263, 9.801, 3.890, 8.238, 9.552, 6.855],
                    labels: {template: "*"}
                }, {
                    name: "Russian Federation",
                    data: [4.743, 7.295, 7.175, 6.376, 8.153, 8.535, 5.247, -7.832, 4.3, 4.3],
                    labels: {template: " "}
                }, {
                    name: "Germany",
                    data: [0.010, -0.375, 1.161, 0.684, 3.7, 3.269, 1.083, -5.127, 3.690, 2.995]
                },{
                    name: "World",
                    data: [1.988, 2.733, 3.994, 3.464, 4.001, 3.939, 1.333, -2.245, 4.339, 2.727]
                }],
                valueAxis: {
                    labels: {
                        format: "{0}%"
                    },
                    line: {
                        visible: false
                    },
                    axisCrossingValue: 0
                },
                categoryAxis: {
                    categories: [2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011],
                    line: {
                        visible: false
                    },
                    labels: {
                        padding: {top: 135}
                    }
                },
                tooltip: {
                    visible: true,
                    format: "{0}%",
                    template: "#= series.name #: #= value #"
                }
            });
        }

        $(document).ready(createChart);
        $(document).bind("kendo:skinChange", createChart);
    </script>
</div>


</body>
</html>

Upvotes: 0

Views: 2396

Answers (2)

Shai
Shai

Reputation: 3882

I've used your code to build a solution. You might not use it exactly as it is but you'll get the general idea. See this Plunker.

Basically what I did was the following:

1) Convert the series' items into objects with two fields, one is the actual data and the other is the label identifier.

data: [{value: 1, label: 0}, {value: 2, label: 1}, {value: 3, label: 2}],

2) Make a function that converts the template object (e) to the right label string.

let labels = {
    "India": ["label1", "label2", "label3"],
    "Russian Federation": [2, 4, 6]
};

let getLabel = function(e) {
    return labels[e.series.name][e.dataItem.label];
};

3) Place the function in the template field of the series.

seriesDefaults: {
    labels: {
        template: getLabel
    }
}

Upvotes: 1

ezanker
ezanker

Reputation: 24738

You could use the visual property of the labels to set the text based on value:

seriesDefaults: {
    type: "column",
    labels: {
             visible: true, color: 'red',
             position: "outsideEnd",
             visual: function(e) {
                var center = e.rect.center();
                var val = parseFloat(e.text);
                var text = "↑";
                if (val > 4) text = "*";
                if (val > 7) text = " ";
                return new kendo.drawing.Text(text, [center.x, e.rect.origin.y], {
                    fill: {
                      color: "red"
                    }
                });
                }

            }
},

DEMO

Upvotes: 0

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