|
| 1 | +import './scrollList.scss'; |
| 2 | +import React, { Component, Children } from 'react'; |
| 3 | +import { findDOMNode } from 'react-dom'; |
| 4 | +import PropTypes from 'prop-types'; |
| 5 | + |
| 6 | +export default class extends Component { |
| 7 | + constructor () { |
| 8 | + super(); |
| 9 | + this.state = { |
| 10 | + isBindScrollEvent: false, |
| 11 | + status: 'init' // init wait |
| 12 | + }; |
| 13 | + this.elementScrollHandlerBind = this.elementScrollHandler.bind(this); |
| 14 | + } |
| 15 | + |
| 16 | + static propTypes = { |
| 17 | + hasMore: PropTypes.bool, // 是否还有更多 |
| 18 | + loading: PropTypes.bool, // 是否能够加载,请求中的状态不允许加载 |
| 19 | + onLoad: PropTypes.func, // 加载的函数 |
| 20 | + element: PropTypes.object, // 监听的元素 |
| 21 | + extra: PropTypes.number, // 额外的底边距 |
| 22 | + isEmpty: PropTypes.bool // 是否为空 |
| 23 | + }; |
| 24 | + |
| 25 | + static defaultProps = { |
| 26 | + hasMore: true, |
| 27 | + loading: true, |
| 28 | + onLoad: ()=>{}, |
| 29 | + element: null, |
| 30 | + extra: 10 |
| 31 | + }; |
| 32 | + |
| 33 | + elementScrollHandler (e) { |
| 34 | + let { scrollHeight, clientHeight, scrollTop } = e.target; |
| 35 | + let { loading, onLoad, hasMore, extra } = this.props; |
| 36 | + |
| 37 | + console.log('loading:', loading, 'hasMore', hasMore); |
| 38 | + if ( clientHeight + scrollTop + extra >= scrollHeight && !loading && hasMore ) { |
| 39 | + onLoad(); |
| 40 | + } |
| 41 | + } |
| 42 | + |
| 43 | + componentWillReceiveProps (nextProps) { |
| 44 | + this.tryToBindScrollEvent(nextProps.element); |
| 45 | + } |
| 46 | + |
| 47 | + componentDidMount () { |
| 48 | + this.tryToBindScrollEvent(this.props.element); |
| 49 | + } |
| 50 | + |
| 51 | + tryToBindScrollEvent (element) { |
| 52 | + let { isBindScrollEvent } = this.state; |
| 53 | + |
| 54 | + if ( element && isBindScrollEvent === false ) { |
| 55 | + element.addEventListener('scroll', this.elementScrollHandlerBind, false); |
| 56 | + this.setState({ isBindScrollEvent: true }); |
| 57 | + } |
| 58 | + } |
| 59 | + |
| 60 | + componentWillUnmount () { |
| 61 | + let { element } = this.props; |
| 62 | + if ( element ) { |
| 63 | + element.removeEventListener('scroll', this.elementScrollHandlerBind, false); |
| 64 | + } |
| 65 | + } |
| 66 | + |
| 67 | + render () { |
| 68 | + let { loading, hasMore, isEmpty } = this.props; |
| 69 | + |
| 70 | + return ( |
| 71 | + <div className="scroll-list"> |
| 72 | + {this.props.children} |
| 73 | + { |
| 74 | + loading && |
| 75 | + <div className="weui-loadmore"> |
| 76 | + <i className="weui-loading"/> |
| 77 | + <span className="weui-loadmore__tips">正在加载</span> |
| 78 | + </div> |
| 79 | + } |
| 80 | + { |
| 81 | + !hasMore && |
| 82 | + <div className="weui-loadmore weui-loadmore_line weui-loadmore_dot"> |
| 83 | + <span className="weui-loadmore__tips"/> |
| 84 | + </div> |
| 85 | + } |
| 86 | + { |
| 87 | + isEmpty && |
| 88 | + <div className="weui-loadmore weui-loadmore_line"> |
| 89 | + <span className="weui-loadmore__tips">暂无数据</span> |
| 90 | + </div> |
| 91 | + } |
| 92 | + </div> |
| 93 | + ); |
| 94 | + } |
| 95 | +} |
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