react-kube/InfiniteScroll.js

Kube CSS in React Components

"use strict";

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 _get = function get(_x, _x2, _x3) { var _again = true; _function: while (_again) { var object = _x, property = _x2, receiver = _x3; desc = parent = getter = undefined; _again = false; var desc = Object.getOwnPropertyDescriptor(object, property); if (desc === undefined) { var parent = Object.getPrototypeOf(object); if (parent === null) { return undefined; } else { _x = parent; _x2 = property; _x3 = receiver; _again = true; continue _function; } } else if ("value" in desc) { return desc.value; } else { var getter = desc.get; if (getter === undefined) { return undefined; } return getter.call(receiver); } } };

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 _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) subClass.__proto__ = superClass; }

var _react = require("react");

var _react2 = _interopRequireDefault(_react);

var InfiniteScroll = (function (_React$Component) {
  function InfiniteScroll(props) {
    _classCallCheck(this, InfiniteScroll);

    _get(Object.getPrototypeOf(InfiniteScroll.prototype), "constructor", this).call(this, props);
    this.state = { isLoading: false };
  }

  _inherits(InfiniteScroll, _React$Component);

  _createClass(InfiniteScroll, [{
    key: "componentDidMount",
    value: function componentDidMount() {
      _react2["default"].findDOMNode(this.refs.infiniteScrollWrapper).addEventListener("scroll", this.handleScroll.bind(this));
    }
  }, {
    key: "componentWillUnmount",
    value: function componentWillUnmount() {
      _react2["default"].findDOMNode(this.refs.infiniteScrollWrapper).removeEventListener("scroll", this.handleScroll.bind(this));
    }
  }, {
    key: "componentWillReceiveProps",
    value: function componentWillReceiveProps(nextProps) {
      if ("isLoading" in nextProps) {
        this.setState({
          isLoading: nextProps.isLoading
        });
      }

      if (nextProps.finished) {
        this.setState({
          finishedScrolling: nextProps.finished
        });
        _react2["default"].findDOMNode(this.refs.infiniteScrollWrapper).removeEventListener("scroll", this.handleScroll.bind(this));
      }
    }
  }, {
    key: "handleScroll",
    value: function handleScroll() {
      //this function will be triggered when the user scrolls
      var threshold = this.props.threshold;
      var innerHeight = _react2["default"].findDOMNode(this.refs.infiniteScrollWrapper).offsetHeight;
      var scrollHeight = _react2["default"].findDOMNode(this.refs.infiniteScrollWrapper).scrollHeight;
      var scrollTop = _react2["default"].findDOMNode(this.refs.infiniteScrollWrapper).scrollTop;

      if (scrollTop + innerHeight + threshold > scrollHeight && !this.state.finishedScrolling) {
        //user reached at bottom
        if (!this.state.isLoading) {
          // avoid multiple request
          this.setState({
            isLoading: true
          });
          this.props.onScrollEnd ? this.props.onScrollEnd() : null; //eslint-disable-line
        }
      }
    }
  }, {
    key: "render",
    value: function render() {
      return _react2["default"].createElement(
        "div",
        { className: this.props.className, ref: "infiniteScrollWrapper", style: this.props.style },
        this.props.children
      );
    }
  }]);

  return InfiniteScroll;
})(_react2["default"].Component);

InfiniteScroll.propTypes = {
  children: _react2["default"].PropTypes.node.isRequired,
  className: _react2["default"].PropTypes.string,
  finished: _react2["default"].PropTypes.bool,
  isLoading: _react2["default"].PropTypes.bool,
  onScrollEnd: _react2["default"].PropTypes.func,
  style: _react2["default"].PropTypes.object,
  threshold: _react2["default"].PropTypes.number
};

InfiniteScroll.defaultProps = { threshold: 25 };

module.exports = InfiniteScroll;