Grid Foreign Key DropDown Editor with Filter TextBox

Environment

Product	Progress® Kendo UI® Grid for jQuery
Product Version	2016.3 1028

Description

How can I have a filter textbox in the dropdown list editor in the Grid foreign key column?

Solution

You may add the filter option in the edit event of the Kendo UI Grid when the automatically generated Kendo UI DropDownList is initialized.

  edit: function(e){
    var ddl = e.container.find("[data-role='dropdownlist']").data("kendoDropDownList");
    if(ddl){
      ddl.setOptions({filter: "contains"});
    }                   
  },

  <script src="https://demos.telerik.com/kendo-ui/content/shared/js/products.js" type="text/javascript"></script>
    <div id="example">
      <div id="grid"></div>

      <script>
        var categories = [{
          "value": 1,
          "text": "Beverages"
        },{
          "value": 2,
          "text": "Condiments"
        },{
          "value": 3,
          "text": "Confections"
        },{
          "value": 4,
          "text": "Dairy Products"
        },{
          "value": 5,
          "text": "Grains/Cereals"
        },{
          "value": 6,
          "text": "Meat/Poultry"
        },{
          "value": 7,
          "text": "Produce"
        },{
          "value": 8,
          "text": "Seafood"
        }];

        $(document).ready(function () {
          var dataSource = new kendo.data.DataSource({
            pageSize: 20,
            data: products,
            autoSync: true,
            schema: {
              model: {
                id: "ProductID",
                fields: {
                  ProductID: { editable: false, nullable: true },
                  ProductName: { validation: { required: true} },
                  CategoryID: { field: "CategoryID", type: "number", defaultValue: 1 },
                  UnitPrice: { type: "number", validation: { required: true, min: 1} }
                }
              }
            }
          });


          $("#grid").kendoGrid({
            dataSource: dataSource,
            filterable: true,
            sortable:true,
            groupable: true,
            pageable: true,
            height: 540,
            edit: function(e){
              var ddl = e.container.find("[data-role='dropdownlist']").data("kendoDropDownList");
              if(ddl){
                ddl.setOptions({filter: "contains"});
              }                     
            },
            toolbar: ["create"],
            columns: [
              { field: "ProductName", title: "Product Name", filterable:false },
              { field: "CategoryID", width: "200px", values: categories, title: "Category", filterable: { multi: true, search:true } },
              { field: "UnitPrice", title: "Unit Price", format: "{0:c}", width: "200px", filterable:false},
              { command: "destroy", title: " ", width: "150px"}],
            editable: true
          });
        });
      </script>
    </div>