Filter DataSource Manually

The Kendo UI DropDownList has a built-in detection mechanism that checks whether the data is filtered or not.

The widget uses this information to decide when to persist the selected value that does not exist in the source. When the source is manually filtered, the widget loses the details about the state of the DataSource, which might lead to inconsistent behavior.

The following example demonstrates how to manually filter the dataSource instance of the DropDownList.

<div id="example">
    <div class="demo-section k-header">
        <h4>DropDownList</h4>
        <select id="dropdownlist"></select>
    </div>
    <script>
        $(function() {
            var dropdownlist = $("#dropdownlist").kendoDropDownList({
                dataTextField: "name",
                dataValueField: "value",
                dataSource: {
                    data: [{ name: "One", value: 1 }, { name: "Two", value: 2 }]
                }
            }).data('kendoDropDownList');

            //Filter the source manually
            dropdownlist.dataSource.filter({
                field: 'value',
                operator: 'eq',
                value: 1
            });

            <!-- IMPORTANT: Update filter state of the widget -->
            dropdownlist.listView.setDSFilter(dropdownlist.dataSource.filter());

            dropdownlist.value(1);
        });
    </script>
</div>

Filter DataSource Manually

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