@salesforce/design-system-react/module/utilities/key-letter-menu-item-select.js

Salesforce Lightning Design System for React

/* Copyright (c) 2015-present, salesforce.com, inc. All rights reserved */

/* Licensed under BSD 3-Clause - see LICENSE.txt or git.io/sfdc-license */
import escapeRegExp from 'lodash.escaperegexp'; // Determines the focusedIndex of a menu item following keyboard letter presses

var keyLetterMenuItemSelect = function keyLetterMenuItemSelect(_ref) {
  var key = _ref.key,
      keyBuffer = _ref.keyBuffer,
      keyCode = _ref.keyCode,
      options = _ref.options;
  var ch = key || String.fromCharCode(keyCode);

  if (/^[ -~]$/.test(ch)) {
    ch = ch.toLowerCase();
  } else {
    ch = null;
  }

  var pattern = keyBuffer(ch);
  var consecutive = 0;
  var focusedIndex; // Support for navigating to the next option of the same letter with repeated presses of the same key

  if (pattern.length > 1 && new RegExp("^[".concat(escapeRegExp(ch), "]+$")).test(pattern)) {
    consecutive = pattern.length;
  }

  options.forEach(function (item, index) {
    var itemLabel = String(item.label).toLowerCase();

    if (focusedIndex === undefined && itemLabel.substr(0, pattern.length) === pattern || consecutive > 0 && itemLabel.substr(0, 1) === ch) {
      consecutive -= 1;
      focusedIndex = index;
    }
  });
  return focusedIndex;
};

export default keyLetterMenuItemSelect;
//# sourceMappingURL=key-letter-menu-item-select.js.map