Add a TrendLine

Building on the Quick Start example, you can add a trend line to your chart using attributes of the seriesList option.

In the <head> section of your HTML file, replace the script that includes the document ready function with this one, which uses data more suited to a trend line, and adds a trend line to the seriesList option using the following TrendLine attributes:

isTrendLine: Set this value to true to indicate that the series item is a trend line rather than a regular data item.
label: Set this value to "Trendline for West" for the legend so that we can distinguish it from the line chart.
order: Set this value to 4 to indicate the number of terms to use for the polynom equation (default fitType is polynom).
data: Bind the data y value to "west" to create the trend line for the column series in the chart.

Script	Copy Code
<script id="scriptInit" type="text/javascript"> var data1 = [{ type: "Desktops", west: 5, central: 2, east: 3, Steam1: 3 }, { type: "Notebooks", west: 3, central: 2, east: 4, Steam1: 6 }, { type: "Tablets", west: 7, central: 2, east: 2, Steam1: 9 }, { type: "Phones", west: 2, central: 1, east: 5, Steam1: 5 }], pieData = [{ label: "MacBook Pro", legendEntry: true, data: 46.78, offset: 15 }, { label: "iMac", legendEntry: true, data: 23.18, offset: 0 }, { label: "MacBook", legendEntry: true, data: 20.25, offset: 0 }]; require(["wijmo.wijcompositechart"], function () { $(document).ready(function () { $("#wijcompositechart").wijcompositechart({ dataSource: data1, data: {x: {bind: "type"}}, seriesList: [{ type: "column", label: "West", data: { y: {bind: "west"} } },{ type: "pie", center: {x: 70, y: 70}, radius: 30, dataSource: pieData, data: { label: {bind: "label"}, value: {bind: "data"}, offset: {bind: "offset"} } },{ type: "line", label: "Steam1", data: { y: {bind: "Steam1"} } },{ isTrendline: true, label: "Trendline for West", order: 4, data: { y: {bind: "west"} } } ] }); }); }); </script>

Script

Copy Code

<script id="scriptInit" type="text/javascript">
        var data1 = [{
            type: "Desktops",
            west: 5,
            central: 2,
            east: 3,
            Steam1: 3
        }, {
            type: "Notebooks",
            west: 3,
            central: 2,
            east: 4,
            Steam1: 6
        }, {
            type: "Tablets",
            west: 7,
            central: 2,
            east: 2,
            Steam1: 9
        }, {
            type: "Phones",
            west: 2,
            central: 1,
            east: 5,
            Steam1: 5
        }], pieData = [{
            label: "MacBook Pro",
            legendEntry: true,
            data: 46.78,
            offset: 15
        }, {
            label: "iMac",
            legendEntry: true,
            data: 23.18,
            offset: 0
        }, {
            label: "MacBook",
            legendEntry: true,
            data: 20.25,
            offset: 0
        }];
        require(["wijmo.wijcompositechart"], function () {
        $(document).ready(function () {
            $("#wijcompositechart").wijcompositechart({
                dataSource: data1,
                data: {x: {bind: "type"}},
                seriesList: [{
                    type: "column",
                    label: "West",
                    data: {
                        y: {bind: "west"}
                    }
                  },{
                    type: "pie",
                    center: {x: 70, y: 70},
                    radius: 30,
                    dataSource: pieData,
                    data: {
                        label: {bind: "label"},
                        value: {bind: "data"},
                        offset: {bind: "offset"}
                    }
                  },{
                    type: "line",
                    label: "Steam1",
                    data: {
                        y: {bind: "Steam1"}
                    }
                  },{
                    isTrendline: true,
                    label: "Trendline for West",
                    order: 4,
                    data: {
                        y: {bind: "west"}
                    }
                  }
                ]
            });
        });
        });
</script>

No changes are necessary in the <body> section of your HTML file. The basic <div> tag is sufficient to create the widget.
Save your HTML file and open it in a browser. The widget appears like the one in the live widget below, with the TrendLine added to the chart.

Concepts

Widgets

Reference