@10up/react-focus-trap-hoc/lib/index.js

Higher order component used to trap keyboard focus within a wrapped component.

'use strict';

Object.defineProperty(exports, "__esModule", {
	value: true
});

var _extends = Object.assign || function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; };

var _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();

var _react = require('react');

var _react2 = _interopRequireDefault(_react);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

function _possibleConstructorReturn(self, call) { if (!self) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return call && (typeof call === "object" || typeof call === "function") ? call : self; }

function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function, not " + typeof superClass); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, enumerable: false, writable: true, configurable: true } }); if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass; }

var trapHOC = function trapHOC() {
	var options = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};
	return function (WrappedComponent) {
		var args = Object.assign({ trapIsActive: false }, options);

		var FocusTrap = function (_Component) {
			_inherits(FocusTrap, _Component);

			function FocusTrap() {
				_classCallCheck(this, FocusTrap);

				var _this = _possibleConstructorReturn(this, (FocusTrap.__proto__ || Object.getPrototypeOf(FocusTrap)).call(this));

				_this.state = {
					trapIsActive: args.trapIsActive
				};

				_this.focusLock = _this.focusLock.bind(_this);
				_this.activateTrap = _this.activateTrap.bind(_this);
				_this.deactivateTrap = _this.deactivateTrap.bind(_this);
				return _this;
			}

			_createClass(FocusTrap, [{
				key: 'componentDidMount',
				value: function componentDidMount() {
					if (typeof document !== 'undefined') {
						document.addEventListener('focus', this.focusLock, true);
					}
				}
			}, {
				key: 'componentWillUnmount',
				value: function componentWillUnmount() {
					if (typeof document !== 'undefined') {
						document.removeEventListener('focus', this.focusLock, true);
					}
				}
			}, {
				key: 'activateTrap',
				value: function activateTrap() {
					this.setState({ trapIsActive: true });
				}
			}, {
				key: 'deactivateTrap',
				value: function deactivateTrap() {
					this.setState({ trapIsActive: false });
				}
			}, {
				key: 'focusLock',
				value: function focusLock(e) {
					if (this.state.trapIsActive === true && this.el && e.target) {
						var el = this.el;
						var focusable = el.querySelectorAll('[tabindex]:not([tabindex="-1"]), button:not([tabindex="-1"]), [role="button"]:not([tabindex="-1"]), [href]:not([tabindex="-1"]), input:not([tabindex="-1"]), select:not([tabindex="-1"]), textarea:not([tabindex="-1"])');
						var firstFocusable = focusable[0];

						if (!el.contains(e.target)) {
							e.stopPropagation();
							if (firstFocusable) {
								firstFocusable.focus();
							}
						}
					}
				}
			}, {
				key: 'render',
				value: function render() {
					var _this2 = this;

					return _react2.default.createElement(
						'div',
						{ className: 'trapper', ref: function ref(el) {
								_this2.el = el;
							} },
						_react2.default.createElement(WrappedComponent, _extends({}, this.props, { activateTrap: this.activateTrap, deactivateTrap: this.deactivateTrap }))
					);
				}
			}]);

			return FocusTrap;
		}(_react.Component);

		return FocusTrap;
	};
};

exports.default = trapHOC;