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extra Boolean (default: true)

If set to true the filter menu allows the user to input a second criterion.

Example - disable the extra filtering criteria

<div id="filter-menu">(age filter)</div>
<br /><br />
<div id="grid"></div>
  var data = [
      { name: "Jane Doe", age: 30 },
      { name: "John Doe", age: 33 }

  var dataSource = new kendo.data.DataSource({
    data: data

    dataSource: dataSource,
    field: "age",
    extra: false

    columns: [
      { field: "name" },
      { field: "age" }
    dataSource: dataSource
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