原文地址

分頁組件:

import React, { Component } from 'react';
import PropTypes from 'prop-types';
import { Link } from 'react-router-dom';

import './style.css';
import nextBtn from './images/nextBtn.png';
import preBtnDisabled from './images/preBtn-disabled.png';

export default class Pagination extends Component {
    constructor(props) {
        super(props);
        this.state = {
            currentPageNum: 1,
        }
    }

    componentDidMount() {
        this.handleAnchor() //頁面刷新時回到刷新前的page
    }

    handleAnchor() {
        let index = window.location.hash.slice(1) || 1;
        this.goToPage(parseInt(index, 10));
    }

    //翻頁
    goToPage(num) {
        this.setState({currentPageNum: num});
        this.props.goToPage(num);
    }

    //頁碼輸入框
    changePageNumber(event) {
        this.setState({
            currentPageNum: event.target.value
        });
    }

    //鍵盤按下事件
    handleKeyUp(e, pageTotal) {
        let value = e.target.value;
        let event = e || window.event;
        let code = event.keyCode || event.which || event.charCode;
        if (code === 13) { //回車鍵
            if (isNaN(value)) { //isNaN() 不是一個數(shù)字返回true
                alert('請輸入數(shù)字！')
            } else if(value > pageTotal || value === null || value.trim() === '') { //使用trim()去掉空格，全為空格的字符串不為''也不為null
                alert('請輸入合法的頁碼')
            } else {
                window.location.hash = `#${value}`;
                this.goToPage(parseInt(value, 10)) //這里一定要將value類型轉(zhuǎn)換為數(shù)字甘邀，用戶手動輸入頁碼很有可能是string此衅。而最好在這里轉(zhuǎn)換是因?yàn)橐呀?jīng)過濾了不是數(shù)字和空的值金句，不會出現(xiàn)NaN的情況
            }
        }
    }


    render() {
        let pageTotal = Math.ceil(this.props.total / this.props.pageSize); //頁碼總數(shù)
        return (
            <section className="pagination">
                {this.state.currentPageNum === 1 ?
                    <span className="pagination-button">
                        <img src={preBtnDisabled} alt=""/>
                    </span>
                    :
                    <Link
                        to={{
                            pathname: '/blog',
                            hash: `#${this.state.currentPageNum-1}`
                        }}
                        className="pagination-button pre-button"
                        onClick={() => this.goToPage(this.state.currentPageNum-1)}
                    >
                        <img src={nextBtn} alt="" style={{transform: 'rotate(180deg)'}}/>
                    </Link>
                }

                <div className="pagination-pageNumber">
                    <p>
                        <input
                            type="text"
                            value={this.state.currentPageNum}
                            onChange={this.changePageNumber.bind(this)}
                            onKeyUp={(event) => this.handleKeyUp(event, pageTotal)}
                        />
                        <span>/&nbsp;{pageTotal}</span>
                    </p>
                </div>

                {this.state.currentPageNum === pageTotal ?
                    <span className="pagination-button">
                        <img src={preBtnDisabled} alt="" style={{transform: 'rotate(180deg)'}}/>
                    </span>
                    :
                    <Link
                        to={{
                            pathname: '/blog',
                            hash: `#${this.state.currentPageNum+1}`
                        }}
                        className="pagination-button next-button"
                        onClick={() => this.goToPage(this.state.currentPageNum+1)}
                    >
                        <img src={nextBtn} alt="" />
                    </Link>
                }
            </section>

        )
    }
}

Pagination.defaultProps = {
    pageSize: 5,
    currentPageNum: 1,
};

Pagination.propTypes = {
    total: PropTypes.number.isRequired, //數(shù)據(jù)總數(shù)
    pageSize: PropTypes.number, //一頁顯示幾條數(shù)據(jù)
    currentPageNum: PropTypes.number, //當(dāng)前頁碼
};

調(diào)用方法：

import React, { Component } from 'react';
import Pagination from '../components/pagination';

class Test extends Component {
    constructor(props) {
        super(props);
        this.state = {
            total: 0, //數(shù)據(jù)總數(shù)
            data: [],
        };
        this.pageSize = 10; //一頁顯示的數(shù)據(jù)條數(shù)
    }

    //獲取數(shù)據(jù)
    requestData() {
        fetch('http://localhost:3100/test.json').then(response => response.json())
            .then(res => {
              this.setState({
                total: res.total,
                data: res.data
              })
            })
            .catch(err => console.log('err', err))
    }

    //翻頁
    goToPage(pageNum) {
        this.requestData();
    }

    render() {
        let blogItem = this.state.data && this.state.data.map((item, index) => {
            return (
                <section key={index}>
                      <p>{item.categoryName}</p>
                      <img src = {{uri: item.coverUrl}} alt=""/>
                      <h3>{item.title}</h3>
                </section>
            )
        });

        return (
            <section>
                {blogItem}
                <Pagination
                    total={this.state.total}
                    pageSize = {this.pageSize}
                    goToPage = {(pageNum) => this.goToPage(pageNum)}
                />
            </section>
        )
    }
}

export default Test;