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Show PivotGrid Data in a Chart

Environment

Product Progress Kendo UI PivotGrid
Progress Kendo UI version Created with the 2021.3.1109 version

Description

I want to create a Kendo UI Chart using the data of the Kendo UI PivotGrid. How can I achieve this?

Solution

  1. Define two separate views for the PivotGrid and the Chart. Refer to the showGrid() and showChart() methods in the snippet below.
  2. Convert the tree structure of the PivotGrid data to a simple array of objects. Refer to the convertData() method.
  3. Create a Kendo UI DropDownList which will be used to select the type of the chart.
  4. Handle the change event of the DropDownList to update the type of the displayed chart. Refer to the fillChartPicker() method.

This solution is courtesy of a Telerik Feedback Portal user. You can find the original post in the following thread:

Feedback Portal: Chart chooser for PivotGrid

The following example demonstrates the full implementation of the suggested approach.

<div id="app"></div>

<script>
    var layout = new kendo.Layout("<section id='content'></section>");

    $(document).ready(function () {
        layout.render($("#app"));
        showGrid(layout, dataSource);
    });
</script>

<script id="template" type="text/x-kendo-template">
            <div>
                <div>Rows: #:rowText#</div>
                <div>Columns: #:columnText#</div>
                <div>Value: #:value ? value : "N/A" #</div>
      </div>
    </script>

<script id="pivotgrid">
    function showGrid(layout, dataSource) {
        var pivot = new kendo.View(
            "<input id=\"chartPicker\" value=\"View as chart\" style=\"margin: 0 0 10px 1px;\" /></div><div id=\"configurator\"></div><div id=\"pivotgrid\"></div>");

        layout.showIn("#content", pivot);

        var collapsed = {
            columns: [],
            rows: []
        };

        var pivotgrid = $("#pivotgrid").kendoPivotGrid({
            filterable: true,
            // gather the collapsed members
            collapseMember: function (e) {
                var axis = collapsed[e.axis];
                var path = e.path[0];

                if (axis.indexOf(path) === -1) {
                    axis.push(path);
                }
            },
            // gather the expanded members
            expandMember: function (e) {
                var axis = collapsed[e.axis];
                var index = axis.indexOf(e.path[0]);

                if (index !== -1) {
                    axis.splice(index, 1);
                }
            },
            sortable: true,
            columnWidth: 150,
            dataSource: dataSource,
            height: "100%"
        }).data("kendoPivotGrid");

        var configurator = $("#configurator").kendoPivotConfigurator({
            dataSource: pivotgrid.dataSource,
            filterable: true,
            sortable: true,
            height: "100%"
        }).getKendoPivotConfigurator();

        fillChartPicker(layout, pivotgrid.dataSource, collapsed);
    }
</script>

<script id="chart">
    function showChart(layout, dataSource, collapsed, chartType) {
        var chart = new kendo.View(
            "<div id=\"buttonMenu\"><button id=\"pivotView\" class=\"k-button k-button-icontext\" style=\"margin: 0 0 10px 1px;\">Show pivot grid</button>"
            + "<input id=\"chartPicker\" style=\"margin: 0 0 10px 1px;\" /></div>"
            + "<div id=\"chart\"></div>");

        layout.showIn("#content", chart);

        $("#pivotView").click(function () {
            showGrid(layout, dataSource);
        });

        fillChartPicker(layout, dataSource, collapsed);

        var data = convertData(dataSource, collapsed);
        var chart = $("#chart").data("kendoChart");

        if (!chart) {
            $("#chart").kendoChart({
                zoomable: true,
                pannable: true,
                dataSource: {
                    data: data,
                    group: "row"
                },
                seriesDefaults: {
                    type: chartType
                },
                series: [{
                    field: "measure",
                    name: "#= group.value # (category)",
                    categoryField: "column",
                    stack: true
                }],
                legend: {
                    position: "bottom"
                },
                valueAxis: {
                    labels: {
                        format: "${0}"
                    }
                },
                dataBound: function (e) {
                    e.sender.options.categoryAxis.categories.sort();
                }
            });
        } else {
            chart.dataSource.data(data);
        }
    }
</script>

<script id="chartPicker">
    var charts = [{
        text: "Column",
        type: "column",
        icon: "k-i-chart-column-clustered"
    }, {
        text: "Bar",
        type: "bar",
        icon: "k-i-chart-bar-clustered"
    }];

    function fillChartPicker(layout, dataSource, collapsed) {
        $("#chartPicker").kendoDropDownList({
            dataTextField: "text",
            dataValueField: "type",
            template: "<span class='k-icon #=data.icon#'></span> #=data.text#",
            dataSource: charts,
            optionLabel: "Show as chart...",
            change: function () {
                var chartType = $("#chartPicker").val();
                if (chartType != "") {
                    showChart(layout, dataSource, collapsed, chartType);
                }
            }
        });
    }
</script>

<script id="dataSource">
    var dataSource = {
        type: "xmla",
        columns: [{
            name: "[Date].[Calendar]",
            expand: true
        }],
        rows: [{
            name: "[Product].[Category]",
            expand: true
        }],
        measures: ["[Measures].[Reseller Freight Cost]"],
        transport: {
            connection: {
                catalog: "Adventure Works DW 2008R2",
                cube: "Adventure Works"
            },
            read: "https://demos.telerik.com/olap/msmdpump.dll"
        },
        schema: {
            type: "xmla"
        },
        error: function (e) {
            alert("error: " + kendo.stringify(e.errors[0]));
        }
    };
</script>

<script id="functions">
    // function flatten the tree of tuples that datasource returns
    function flattenTree(tuples) {
        tuples = tuples.slice();
        var result = [];
        var tuple = tuples.shift();
        var idx, length, spliceIndex, children, member;

        while (tuple) {
            // required for multiple measures
            if (tuple.dataIndex !== undefined) {
                result.push(tuple);
            }

            spliceIndex = 0;
            for (idx = 0, length = tuple.members.length; idx < length; idx++) {
                member = tuple.members[idx];
                children = member.children;
                if (member.measure) {
                    [].splice.apply(tuples, [0, 0].concat(children));
                } else {
                    [].splice.apply(tuples, [spliceIndex, 0].concat(children));
                }
                spliceIndex += children.length;
            }

            tuple = tuples.shift();
        }

        return result;
    }

    // Check whether the tuple has been collapsed
    function isCollapsed(tuple, collapsed) {
        var name = tuple.members[0].parentName;

        for (var idx = 0, length = collapsed.length; idx < length; idx++) {
            if (collapsed[idx] === name) {
                return true;
            }
        }

        return false;
    }

    // the main function that convert PivotDataSource data into understandable for
    // the Chart widget format
    function convertData(dataSource, collapsed) {
        var columnTuples = flattenTree(dataSource.axes().columns.tuples || [],
            collapsed.columns);
        var rowTuples = flattenTree(dataSource.axes().rows.tuples || [],
            collapsed.rows);
        var data = dataSource.data();
        var rowTuple, columnTuple;

        var idx = 0;
        var result = [];
        var columnsLength = columnTuples.length;

        for (var i = 0; i < rowTuples.length; i++) {
            rowTuple = rowTuples[i];

            if (!isCollapsed(rowTuple, collapsed.rows)) {
                for (var j = 0; j < columnsLength; j++) {
                    columnTuple = columnTuples[j];

                    if (!isCollapsed(columnTuple, collapsed.columns)) {
                        if (idx > columnsLength && idx % columnsLength !== 0) {
                            result.push({
                                measure: Number(data[idx].value),
                                column: columnTuple.members[0].caption,
                                row: rowTuple.members[0].caption
                            });
                        }
                    }
                    idx += 1;
                }
            }
        }

        return result;
    }
</script>
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