Set Different Colors to Every Child Grid Header

Environment

Product	Progress® Kendo UI® Grid for jQuery
Product Version	Tested up to version 2017.2 504

Description

How can I distinguish between the child grids of a master Kendo UI Grid by setting different colors to the headers of each child grid?

Solution

Conditionally change the background color of the header cells in the dataBound event handler of every child grid.

<div id="grid"></div>

<script>
    $(document).ready(function() {
        var element = $("#grid").kendoGrid({
            dataSource: {
                type: "odata",
                transport: {
                    read: "https://demos.telerik.com/kendo-ui/service/Northwind.svc/Employees"
                },
                pageSize: 6,
                serverPaging: true,
                serverSorting: true
            },
            height: 600,
            sortable: true,
            pageable: true,
            detailInit: detailInit,
            dataBound: function() {
                this.expandRow(this.tbody.find("tr.k-master-row").first());
            },
            columns: [{
                    field: "FirstName",
                    title: "First Name",
                    width: "110px"
                },
                {
                    field: "LastName",
                    title: "Last Name",
                    width: "110px"
                },
                {
                    field: "Country",
                    width: "110px"
                },
                {
                    field: "City",
                    width: "110px"
                },
                {
                    field: "Title"
                }
            ]
        });
    });

    function detailInit(e) {
        $("<div id='grid_" + e.data.EmployeeID + "'/>").appendTo(e.detailCell).kendoGrid({
            dataSource: {
                type: "odata",
                transport: {
                    read: "https://demos.telerik.com/kendo-ui/service/Northwind.svc/Orders"
                },
                serverPaging: true,
                serverSorting: true,
                serverFiltering: true,
                pageSize: 10,
                filter: {
                    field: "EmployeeID",
                    operator: "eq",
                    value: e.data.EmployeeID
                }
            },
            scrollable: false,
            sortable: true,
            pageable: true,
            dataBound: childGridDataBound,
            columns: [{
                    field: "OrderID",
                    width: "110px"
                },
                {
                    field: "ShipCountry",
                    title: "Ship Country",
                    width: "110px"
                },
                {
                    field: "ShipAddress",
                    title: "Ship Address"
                },
                {
                    field: "ShipName",
                    title: "Ship Name",
                    width: "300px"
                }
            ]
        });
    };

    function childGridDataBound(e) {
        var colors = ["red", "yellow", "blue"];
        var ID = e.sender.element[0].id;
        var row = $("#" + ID).find(".k-grid-header tr");
        var cells = row.children();

        cells.css("background-color", colors[ID.slice(-1) % 3]);
    };
</script>