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Cascade MultiSelects from DropDownLists

Environment

Product Progress Kendo UI MultiSelect for jQuery
Operating System Windows 10 64bit
Visual Studio version Visual Studio 2017
Preferred Language JavaScript

Description

How can I cascade the Kendo UI MultiSelect from a Kendo UI DropDownList?

Solution

The following example demonstrates how to achieve the desired scenario.

    <div>
      supplier: <select id="suppliers"></select>
    </div>
    <div>
      product: <select id="products"></select>
    </div>
    <script>
      $(function() {
        var productsDataSource = new kendo.data.DataSource({
          type: "odata",
          serverFiltering: true,
          transport: {
            read: {
              url: "https://demos.telerik.com/kendo-ui/service/Northwind.svc/Products",
            }
          }
        });

        $("#products").kendoMultiSelect({
          autoBind: false,
          dataTextField: "ProductName",
          dataValueField: "ProductID",
          dataSource: productsDataSource
        });

        $("#suppliers").kendoDropDownList({
          optionLabel: "Select supplier",
          dataTextField: "CompanyName",
          dataValueField: "SupplierID",
          dataSource: {
            type: "odata",
            serverFiltering: true,
            transport: {
              read: {
                url: "https://demos.telerik.com/kendo-ui/service/Northwind.svc/Suppliers"
              }
            }
          },
          change: function() {
            var filters = buildFilters([this.dataItem()]);
            productsDataSource.filter(filters);
          }
        });

        function buildFilters(dataItems) {
          var filters = [];
          var length = dataItems.length;
          var supplierID;
          var idx = 0;

          for (; idx < length; idx++) {
            supplierID = parseInt(dataItems[idx].SupplierID);

            if (!isNaN(supplierID)) {
              filters.push({
                field: "SupplierID",
                operator: "eq",
                value: supplierID
              });
            }
          }
          return filters;
        }
      });
    </script>

See Also

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