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filterable.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="grid"></div>
<script>
$("#grid").kendoGrid({
  columns: [
    { field: "name" },
    { field: "age" }
  ],
  filterable: {
    extra: false
  },
  dataSource: [
    { name: "Jane Doe", age: 30 },
    { name: "John Doe", age: 33 }
  ]
});
</script>