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Data Grid

Cascading Lookups

Documentation

You can assign a lookup editor to a column. This editor displays a drop-down list populated with values from the specified data source. Users can filter the drop-down list to quickly locate required values.

This demo shows how to implement cascading lookups:

  1. Configure the primary lookup
    A column's lookup is configured in the lookup object. Assign an array of items to the lookup's dataSource. Then specify the valueExpr and displayExpr options if the data source contains objects. (See the StateID column.)

  2. Configure the secondary lookup
    The secondary lookup has a similar configuration, but its dataSource should be a function so that you can dynamically filter the lookup. (See step 3.)

  3. Connect the lookups
    To filter the secondary lookup's items based on the primary lookup's value, specify the filter option in the secondary lookup's dataSource. (See the CityID column).

  4. Reset the secondary lookup when the primary lookup's value is changed
    Use the setCellValue function as shown in the StateID column's configuration.

  5. Disable the secondary lookup until the primary lookup's value is set
    Use the onEditorPreparing handler for this.

After you configure lookups, enable edit operations. Specify the required editing.mode and set the editing object's allowUpdating, allowAdding, and allowDeleting options to true.

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window.onload = function() { var viewModel = { dataGridOptions: { keyExpr: "ID", dataSource: employees, showBorders: true, editing: { allowUpdating: true, allowAdding: true, mode: "row" }, onEditorPreparing: function(e) { if(e.parentType === "dataRow" && e.dataField === "CityID") { e.editorOptions.disabled = (typeof e.row.data.StateID !== "number"); } }, columns: ["FirstName", "LastName", "Position", { dataField: "StateID", caption: "State", setCellValue: function(rowData, value) { rowData.StateID = value; rowData.CityID = null; }, lookup: { dataSource: states, valueExpr: "ID", displayExpr: "Name" } }, { dataField: "CityID", caption: "City", lookup: { dataSource: function (options) { return { store: cities, filter: options.data ? ["StateID", "=", options.data.StateID] : null }; }, valueExpr: "ID", displayExpr: "Name" } } ] } }; ko.applyBindings(viewModel, document.getElementById("data-grid-demo")); };
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var employees = [{ "ID": 1, "FirstName": "John", "LastName": "Heart", "Prefix": "Mr.", "Position": "CTO", "StateID": 5, "CityID": 17 }, { "ID": 2, "FirstName": "Olivia", "LastName": "Peyton", "Prefix": "Mrs.", "Position": "HR Manager", "StateID": 5, "CityID": 17 }, { "ID": 3, "FirstName": "Robert", "LastName": "Reagan", "Prefix": "Mr.", "Position": "IT Manager", "StateID": 4, "CityID": 14 }, { "ID": 4, "FirstName": "Greta", "LastName": "Sims", "Prefix": "Ms.", "Position": "Shipping Manager", "StateID": 3, "CityID": 8 }, { "ID": 5, "FirstName": "Brett", "LastName": "Wade", "Prefix": "Mr.", "Position": "Shipping Manager", "StateID": 3, "CityID": 9 }, { "ID": 6, "FirstName": "Sandra", "LastName": "Johnson", "Prefix": "Mrs.", "Position": "Network Admin", "StateID": 2, "CityID": 6 }, { "ID": 7, "FirstName": "Kevin", "LastName": "Carter", "Prefix": "Mr.", "Position": "Network Admin", "StateID": 1, "CityID": 3 }, { "ID": 8, "FirstName": "Cynthia", "LastName": "Stanwick", "Prefix": "Ms.", "Position": "Sales Assistant", "StateID": 1, "CityID": 3 }, { "ID": 9, "FirstName": "Kent", "LastName": "Samuelson", "Prefix": "Dr.", "Position": "Sales Assistant", "StateID": 1, "CityID": 2 }, { "ID": 10, "FirstName": "Taylor", "LastName": "Riley", "Prefix": "Mr.", "Position": "Support Assistant", "StateID": 5, "CityID": 17 }, { "ID": 11, "FirstName": "Sam", "LastName": "Hill", "Prefix": "Mr.", "Position": "Sales Assistant", "StateID": 2, "CityID": 5 }, { "ID": 12, "FirstName": "Kelly", "LastName": "Rodriguez", "Prefix": "Ms.", "Position": "Sales Assistant", "StateID": 5, "CityID": 17 }, { "ID": 13, "FirstName": "Natalie", "LastName": "Maguirre", "Prefix": "Mrs.", "Position": "Sales Assistant", "StateID": 4, "CityID": 14 }, { "ID": 14, "FirstName": "Walter", "LastName": "Hobbs", "Prefix": "Mr.", "Position": "Support Assistant", "StateID": 2, "CityID": 5 }]; var states = [{ "ID": 1, "Name": "Alabama" }, { "ID": 2, "Name": "Alaska" }, { "ID": 3, "Name": "Arizona" }, { "ID": 4, "Name": "Arkansas" }, { "ID": 5, "Name": "California" }]; var cities = [{ "ID": 1, "Name": "Tuscaloosa", "StateID": 1 }, { "ID": 2, "Name": "Hoover", "StateID": 1 }, { "ID": 3, "Name": "Dothan", "StateID": 1 }, { "ID": 4, "Name": "Decatur", "StateID": 1 }, { "ID": 5, "Name": "Anchorage", "StateID": 2 }, { "ID": 6, "Name": "Fairbanks", "StateID": 2 }, { "ID": 7, "Name": "Juneau", "StateID": 2 }, { "ID": 8, "Name": "Avondale", "StateID": 3 }, { "ID": 9, "Name": "Buckeye", "StateID": 3 }, { "ID": 10, "Name": "Carefree", "StateID": 3 }, { "ID": 11, "Name": "Springdale", "StateID": 4 }, { "ID": 12, "Name": "Rogers", "StateID": 4 }, { "ID": 13, "Name": "Sherwood", "StateID": 4 }, { "ID": 14, "Name": "Jacksonville", "StateID": 4 }, { "ID": 15, "Name": "Cabot", "StateID": 4 }, { "ID": 16, "Name": "Adelanto", "StateID": 5 }, { "ID": 17, "Name": "Glendale", "StateID": 5 }, { "ID": 18, "Name": "Moorpark", "StateID": 5 }, { "ID": 19, "Name": "Needles", "StateID": 5 }, { "ID": 20, "Name": "Ontario", "StateID": 5 }];