react 分页组件 尝试自己动手用react来写一个分页组件(小结)

create-react-app react-paging-component

 constructor(props) {
    super(props)
    this.state = {
      currentPage: 1, //当前页码
      groupCount: 5, //页码分组，显示7个页码，其余用省略号显示
      startPage: 1, //分组开始页码
      totalPage:1 //总页数
    }
  }

createPage() {
    const {currentPage, groupCount, startPage,totalPage} = this.state;
    let pages = []
    //上一页
    pages.push(<li className={currentPage === 1 ? "nomore" : null} onClick={this.prePageHandeler.bind(this)}
            key={0}>
      上一页</li>)

    if (totalPage <= 10) {
      /*总页码小于等于10时，全部显示出来*/
      for (let i = 1; i <= totalPage; i++) {
        pages.push(<li key={i} onClick={this.pageClick.bind(this, i)}
                className={currentPage === i ? "activePage" : null}>{i}</li>)
      }
    } else {
      /*总页码大于10时，部分显示*/

      //第一页
      pages.push(<li className={currentPage === 1 ? "activePage" : null} key={1}
              onClick={this.pageClick.bind(this, 1)}>1</li>)

      let pageLength = 0;
      if (groupCount + startPage > totalPage) {
        pageLength = totalPage
      } else {
        pageLength = groupCount + startPage;
      }
      //前面省略号(当当前页码比分组的页码大时显示省略号)
      if (currentPage >= groupCount) {
        pages.push(<li className="" key={-1}>···</li>)
      }
      //非第一页和最后一页显示
      for (let i = startPage; i < pageLength; i++) {
        if (i <= totalPage - 1 && i > 1) {
          pages.push(<li className={currentPage === i ? "activePage" : null} key={i}
                  onClick={this.pageClick.bind(this, i)}>{i}</li>)
        }
      }
      //后面省略号
      if (totalPage - startPage >= groupCount + 1) {
        pages.push(<li className="" key={-2}>···</li>)
      }
      //最后一页
      pages.push(<li className={currentPage === totalPage ? "activePage" : null} key={totalPage}
              onClick={this.pageClick.bind(this, totalPage)}>{totalPage}</li>)
    }
    //下一页
    pages.push(<li className={currentPage === totalPage ? "nomore" : null}
            onClick={this.nextPageHandeler.bind(this)}
            key={totalPage + 1}>下一页</li>)
    return pages;

  }

//页码点击
  pageClick(currentPage) {
    const {groupCount} = this.state
    const getCurrentPage = this.props.pageCallbackFn;
    //当 当前页码 大于 分组的页码 时，使 当前页 前面 显示 两个页码
    if (currentPage >= groupCount) {
      this.setState({
        startPage: currentPage - 2,
      })
    }
    if (currentPage < groupCount) {
      this.setState({
        startPage: 1,
      })
    }
    //第一页时重新设置分组的起始页
    if (currentPage === 1) {
      this.setState({
        startPage: 1,
      })
    }
    this.setState({
      currentPage
    })
    //将当前页码返回父组件
    getCurrentPage(currentPage)
  }

//上一页事件
  prePageHandeler() {
    let {currentPage} = this.state
    if (--currentPage === 0) {
      return false
    }
    this.pageClick(currentPage)
  }

  //下一页事件
  nextPageHandeler() {
    let {currentPage,totalPage} = this.state
    // const {totalPage} = this.props.pageConfig;
    if (++currentPage > totalPage) {
      return false
    }
    this.pageClick(currentPage)
  }

render() {
    const pageList = this.createPage();
    return (
      <ul className="page-container">
        {pageList}
      </ul>
    )
  }

import React, {Component} from 'react'
import Pagecomponent from '../components/Pagecomponent'
import data from '../mock/tsconfig.json'

class Pagecontainer extends Component {
  constructor() {
    super()
    this.state = {
      dataList:[],
      pageConfig: {
        totalPage: data.length //总页码
      }
    }
    this.getCurrentPage = this.getCurrentPage.bind(this)
  }
  getCurrentPage(currentPage) {
    this.setState({
      dataList:data[currentPage-1].name
    })
  }
  render() {
    return (
      <div>
        <div>
          {this.state.dataList}
        </div>
        <Pagecomponent pageConfig={this.state.pageConfig}
                pageCallbackFn={this.getCurrentPage}/>
      </div>

    )
  }
}
export default Pagecontainer