react-responsive-html-menu/lib/ResponsiveMenu.js

A React component which will move list items into a dropdown menu by detecting if it will fit within parent container

'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);

var _ResponsiveMenuItem = require('./ResponsiveMenuItem.jsx');

var _ResponsiveMenuItem2 = _interopRequireDefault(_ResponsiveMenuItem);

var _ResponsiveMenuDropdown = require('./ResponsiveMenuDropdown.jsx');

var _ResponsiveMenuDropdown2 = _interopRequireDefault(_ResponsiveMenuDropdown);

var _throttle = require('lodash/throttle');

var _throttle2 = _interopRequireDefault(_throttle);

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 ResponsiveMenu = function (_Component) {
    _inherits(ResponsiveMenu, _Component);

    _createClass(ResponsiveMenu, null, [{
        key: 'setWindowWidth',
        value: function setWindowWidth(width) {
            ResponsiveMenu.windowWidth = width;
        }
    }]);

    function ResponsiveMenu(props) {
        _classCallCheck(this, ResponsiveMenu);

        var _this = _possibleConstructorReturn(this, Object.getPrototypeOf(ResponsiveMenu).call(this, props));

        _this.setBrowserState = (0, _throttle2.default)(function () {
            var visibleCount = _this.state.visibleCount;
            var menu = _this.refs.menu;

            if (!menu.children.length > 1) return;

            var menuChildren = Object.keys(menu.children).map(function (key) {
                return menu.children[key];
            });
            var dropMenu = menuChildren[menuChildren.length - 1];

            dropMenu.style.display = '';
            var menuTopPos = _this.state.init ? dropMenu.getBoundingClientRect().top : menuChildren[0].getBoundingClientRect().top;
            var fittedCount = 0;
            var childrenToCheck = undefined;

            if (ResponsiveMenu.windowWidth < window.innerWidth) {
                // When window size has increased
                childrenToCheck = menuChildren.slice(visibleCount, -1);
                fittedCount = visibleCount;
            } else {
                // When window size has decreased
                childrenToCheck = menuChildren.slice(0, -1);
                childrenToCheck.forEach(function (child) {
                    return child.style.display = 'none';
                });
            }

            ResponsiveMenu.setWindowWidth(window.innerWidth);

            childrenToCheck.every(function (child) {
                child.style.display = '';

                if (dropMenu.getBoundingClientRect().top !== menuTopPos) {
                    return false;
                }

                fittedCount++;
                return true;
            });

            menuChildren.slice(visibleCount, fittedCount + 1).forEach(function (child) {
                return child.style.display = 'none';
            });

            _this.setState({
                visibleCount: fittedCount
            });
        }, 500);


        _this.state = {
            init: true,
            visibleCount: 0
        };
        return _this;
    }

    _createClass(ResponsiveMenu, [{
        key: 'componentDidMount',
        value: function componentDidMount() {
            this.setState({ init: false });
            this.setBrowserState();
            window.addEventListener('resize', this.setBrowserState, false);
        }
    }, {
        key: 'componentWillUnmount',
        value: function componentWillUnmount() {
            window.removeEventListener('resize', this.setBrowserState, false);
        }
    }, {
        key: 'render',
        value: function render() {
            var _props = this.props;
            var className = _props.className;
            var dropdownText = _props.dropdownText;
            var list = _props.list;
            var _state = this.state;
            var init = _state.init;
            var visibleCount = _state.visibleCount;


            if (!list || !Array.isArray(list) || !list.length) return null;

            var dropList = init ? list : list.slice(visibleCount);

            return _react2.default.createElement(
                'ul',
                { ref: 'menu', className: ('react-responsive-menu ' + className).trim() },
                list.map(function (item, i) {
                    var showItem = init ? false : i < visibleCount;

                    return _react2.default.createElement(_ResponsiveMenuItem2.default, _extends({
                        key: i,
                        show: showItem
                    }, item));
                }).concat(_react2.default.createElement(_ResponsiveMenuDropdown2.default, {
                    key: 'dropdown',
                    list: dropList,
                    dropdownText: dropdownText }))
            );
        }
    }]);

    return ResponsiveMenu;
}(_react.Component);

ResponsiveMenu.propTypes = {
    className: _react.PropTypes.string,
    dropdownText: _react.PropTypes.string,
    list: _react.PropTypes.arrayOf(_react.PropTypes.object).isRequired
};
ResponsiveMenu.defaultProps = {
    className: '',
    dropdownText: 'More'
};
ResponsiveMenu.windowWidth = 0;
exports.default = ResponsiveMenu;