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MultiColumnComboBox

virtual.mapValueToString(default: "index")

The changes introduced with the Kendo UI R3 2016 release enable you to determine if the valueMapper must resolve a value to an index or a value to a dataItem. This is configured through the mapValueTo option that accepts two possible values - "index" or "dataItem". By default, the mapValueTo is set to "index", which does not affect the current behavior of the virtualization process.

For more information, refer to the article on virtualization.

Example 

<input id="multicolumncombobox" />
<script>
$("#multicolumncombobox").kendoMultiColumnComboBox({
    virtual: {
        mapValueTo: "dataItem",
        valueMapper: function(options) {
            // implement value mapping logic
            options.success([]);
        }
    },
    dataTextField: "text",
    dataValueField: "value",
    dataSource: {
        transport: {
            read: function(options) {
                // simulate large dataset
                var data = [];
                for(var i = 0; i < 10000; i++) {
                    data.push({ text: "Item " + i, value: i });
                }
                options.success(data);
            }
        }
    },
    columns: [
        { field: "text", title: "Text" },
        { field: "value", title: "Value" }
    ]
});
</script>
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virtual.mapValueTo
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