react-limited-infinite-scroll
Version:
React limited infinite scroll component
216 lines (185 loc) • 9.35 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", {
value: true
});
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 _propTypes = require('prop-types');
var _propTypes2 = _interopRequireDefault(_propTypes);
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
function _objectWithoutProperties(obj, keys) { var target = {}; for (var i in obj) { if (keys.indexOf(i) >= 0) continue; if (!Object.prototype.hasOwnProperty.call(obj, i)) continue; target[i] = obj[i]; } return target; }
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 LimitedInfiniteScroll = function (_Component) {
_inherits(LimitedInfiniteScroll, _Component);
function LimitedInfiniteScroll() {
var _ref;
var _temp, _this, _ret;
_classCallCheck(this, LimitedInfiniteScroll);
for (var _len = arguments.length, args = Array(_len), _key = 0; _key < _len; _key++) {
args[_key] = arguments[_key];
}
return _ret = (_temp = (_this = _possibleConstructorReturn(this, (_ref = LimitedInfiniteScroll.__proto__ || Object.getPrototypeOf(LimitedInfiniteScroll)).call.apply(_ref, [this].concat(args))), _this), _this.state = {
loading: false
}, _this.calcTop = function (element) {
if (!element) {
return 0;
}
return element.offsetTop + _this.calcTop(element.offsetParent);
}, _this.scrollHandler = function () {
var offset = void 0;
var el = _this.selfComponent;
if (_this.props.useWindow) {
var scrollTop = window.pageYOffset !== undefined ? window.pageYOffset : (document.documentElement || document.body.parentNode || document.body).scrollTop;
offset = _this.calcTop(el) + el.offsetHeight - scrollTop - window.innerHeight;
} else {
offset = el.scrollHeight - el.parentNode.scrollTop - el.parentNode.clientHeight;
}
if (offset < Number(_this.props.threshold)) {
_this.detachScrollEvent();
if (typeof _this.props.loadNext === 'function') {
_this.setState({
loading: true
});
_this.props.loadNext(_this.page += 1);
}
}
}, _this.attachScrollEvent = function () {
if (!_this.props.hasMore) {
return;
}
var scrollEl = _this.props.useWindow ? window : _this.selfComponent.parentNode;
scrollEl.addEventListener('scroll', _this.scrollHandler, false);
scrollEl.addEventListener('resize', _this.scrollHandler, false);
if (_this.props.autoLoad && !_this.autoLoaded) {
_this.autoLoaded = true;
_this.scrollHandler();
}
}, _this.detachScrollEvent = function () {
var scrollEl = _this.props.useWindow ? window : _this.selfComponent.parentNode;
scrollEl.removeEventListener('scroll', _this.scrollHandler, false);
scrollEl.removeEventListener('resize', _this.scrollHandler, false);
}, _temp), _possibleConstructorReturn(_this, _ret);
}
_createClass(LimitedInfiniteScroll, [{
key: 'componentWillMount',
value: function componentWillMount() {
this.page = this.props.pageStart;
this.autoLoaded = false;
}
}, {
key: 'componentDidMount',
value: function componentDidMount() {
this.attachScrollEvent();
}
}, {
key: 'componentWillUpdate',
value: function componentWillUpdate(nextProps, nextState) {
if (this.props.children.length < nextProps.children.length) {
this.setState({
loading: false
});
}
}
}, {
key: 'componentDidUpdate',
value: function componentDidUpdate(prevProps, prevState) {
var _this2 = this;
if ((!this.props.limit || this.page < this.props.limit) && this.props.children.length > prevProps.children.length) {
setTimeout(function () {
_this2.attachScrollEvent();
}, 0);
}
}
}, {
key: 'componentWillUnmount',
value: function componentWillUnmount() {
this.detachScrollEvent();
}
}, {
key: 'render',
value: function render() {
var _this3 = this;
var _props = this.props,
limit = _props.limit,
pageStart = _props.pageStart,
threshold = _props.threshold,
hasMore = _props.hasMore,
autoLoad = _props.autoLoad,
useWindow = _props.useWindow,
loadNext = _props.loadNext,
spinLoader = _props.spinLoader,
mannualLoader = _props.mannualLoader,
noMore = _props.noMore,
children = _props.children,
props = _objectWithoutProperties(_props, ['limit', 'pageStart', 'threshold', 'hasMore', 'autoLoad', 'useWindow', 'loadNext', 'spinLoader', 'mannualLoader', 'noMore', 'children']);
var cloneMannualLoader = _react2.default.cloneElement(mannualLoader, {
onClick: function onClick() {
_this3.setState({
loading: true
});
loadNext(_this3.page += 1);
}
});
props.ref = function (node) {
_this3.selfComponent = node;
};
return _react2.default.createElement(
'div',
props,
children,
this.state.loading && hasMore && _react2.default.createElement(
'div',
{ style: { textAlign: 'center' } },
spinLoader
),
!this.state.loading && hasMore && limit > 0 && this.page >= limit && _react2.default.createElement(
'div',
{ style: { textAlign: 'center' } },
cloneMannualLoader
),
!hasMore && noMore
);
}
}]);
return LimitedInfiniteScroll;
}(_react.Component);
LimitedInfiniteScroll.propTypes = {
limit: _propTypes2.default.number,
pageStart: _propTypes2.default.number,
threshold: _propTypes2.default.number,
hasMore: _propTypes2.default.bool,
autoLoad: _propTypes2.default.bool,
useWindow: _propTypes2.default.bool,
loadNext: _propTypes2.default.func.isRequired,
spinLoader: _propTypes2.default.element,
mannualLoader: _propTypes2.default.element,
noMore: _propTypes2.default.element
};
LimitedInfiniteScroll.defaultProps = {
limit: 5,
pageStart: 0,
threshold: 200,
hasMore: false,
autoLoad: true,
useWindow: true,
spinLoader: _react2.default.createElement(
'div',
{ style: { textAlign: 'center', fontSize: 20, lineHeight: 1.5, paddingTop: 20, paddingBottom: 20, clear: 'both' } },
'Loading...'
),
mannualLoader: _react2.default.createElement(
'div',
{ style: { textAlign: 'center', clear: 'both', display: 'inline-block' } },
_react2.default.createElement(
'span',
{ style: { fontSize: 20, lineHeight: 1.5, marginTop: 20, marginBottom: 20, display: 'inline-block', color: '#88899a', border: '1px solid #88899a', borderTopLeftRadius: 3, borderTopRightRadius: 3, borderBottomRightRadius: 3, borderBottomLeftRadius: 3, padding: '10px 20px', cursor: 'pointer' } },
'Load More'
)
),
noMore: null
};
exports.default = LimitedInfiniteScroll;
module.exports = exports['default'];