@quantlab/handsontable/src/editors/dropdownEditor.js

Spreadsheet-like data grid editor that provides copy/paste functionality compatible with Excel/Google Docs

import AutocompleteEditor from './autocompleteEditor';
import Hooks from './../pluginHooks';

/**
 * @private
 * @editor DropdownEditor
 * @class DropdownEditor
 * @dependencies AutocompleteEditor
 */
class DropdownEditor extends AutocompleteEditor {
  prepare(row, col, prop, td, originalValue, cellProperties) {
    super.prepare(row, col, prop, td, originalValue, cellProperties);
    this.cellProperties.filter = false;
    this.cellProperties.strict = true;
  }
}

Hooks.getSingleton().add('beforeValidate', function(value, row, col, source) {
  let cellMeta = this.getCellMeta(row, this.propToCol(col));

  if (cellMeta.editor === DropdownEditor) {
    if (cellMeta.strict === void 0) {
      cellMeta.filter = false;
      cellMeta.strict = true;
    }
  }
});

export default DropdownEditor;