kendoui饼图的汇总函数

Question

I'm trying to make pie chart with aggregate function. It should display category name and products count in that category. I don't know how to find product count for categories.

How to find them? Thanks.

 var dataSource = new kendo.data.DataSource({ type: "odata", transport: { read: "//demos.telerik.com/kendo-ui/service/Northwind.svc/Categories" }, }); $("#chart").kendoChart({ dataSource: dataSource, legend: { visible: true }, seriesDefaults: { type: "pie" }, series: [{ field: "CategoryID", //it should be product count by category categoryField: "CategoryName", explodeField: "explode", labels: { visible: true, } }], }); 

 <div id="chart"></div> 

Answer 1

Try it this way,

    var dataSource = new kendo.data.DataSource({
        type: "odata",
        transport: {
            read: "//demos.telerik.com/kendo-ui/service/Northwind.svc/Categories?$expand=Products"
        },
    });


   $("#chart").kendoChart({
        dataSource: dataSource,
        legend: {
            visible: true
        },
        series: [{
            type: "pie",
            field: "Products.results.length",
            categoryField: "CategoryName",
            explodeField: "explode",
            labels: {
                visible: true,
            }
        }]
    });

Read up on odata expand and getting count of scalar navigation properties for further finesse