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EnforceMinLength

configuration

If set to true the widget will not show all items when the text of the search input cleared. By default, the widget shows all items when the text of the search input is cleared. Works in conjunction with minLength.

enforceMinLength

Boolean

Default: false

<input id="dropdowntree" />

<script>
    var dataSource = new kendo.data.HierarchicalDataSource({
        transport: {
            read: {
                url: "https://demos.telerik.com/service/v2/core/Employees"
            }
        },
        schema: {
            model: {
                id: "EmployeeId",
                hasChildren: "HasEmployees"
            }
        }
    });

    $("#dropdowntree").kendoDropDownTree({
        dataSource: dataSource,
        dataTextField: "FullName",
        dataValueField: "EmployeeId",
        filter: 'startswith',
        minLength: 3,
        loadOnDemand: false,
        enforceMinLength: true,
    });
</script>