如何在reactJs中实现分页

Question

我是ReactJS的新手,我正在创建一个简单的TODO应用程序.实际上,它是一个非常基本的应用程序,没有数据库连接,任务存储在一个数组中.我现在添加了编辑和删除功能,我想添加分页.我该如何实现它？任何帮助将不胜感激.谢谢...!!

Answer 1

我最近在纯React JS中实现了分页.这是一个工作演示:http://codepen.io/PiotrBerebecki/pen/pEYPbY

您当然必须调整逻辑和页码的显示方式,以满足您的要求.

完整代码:

class TodoApp extends React.Component {
  constructor() {
    super();
    this.state = {
      todos: ['a','b','c','d','e','f','g','h','i','j','k'],
      currentPage: 1,
      todosPerPage: 3
    };
    this.handleClick = this.handleClick.bind(this);
  }

  handleClick(event) {
    this.setState({
      currentPage: Number(event.target.id)
    });
  }

  render() {
    const { todos, currentPage, todosPerPage } = this.state;

    // Logic for displaying todos
    const indexOfLastTodo = currentPage * todosPerPage;
    const indexOfFirstTodo = indexOfLastTodo - todosPerPage;
    const currentTodos = todos.slice(indexOfFirstTodo, indexOfLastTodo);

    const renderTodos = currentTodos.map((todo, index) => {
      return <li key={index}>{todo}</li>;
    });

    // Logic for displaying page numbers
    const pageNumbers = [];
    for (let i = 1; i <= Math.ceil(todos.length / todosPerPage); i++) {
      pageNumbers.push(i);
    }

    const renderPageNumbers = pageNumbers.map(number => {
      return (
        <li
          key={number}
          id={number}
          onClick={this.handleClick}
        >
          {number}
        </li>
      );
    });

    return (
      <div>
        <ul>
          {renderTodos}
        </ul>
        <ul id="page-numbers">
          {renderPageNumbers}
        </ul>
      </div>
    );
  }
}


ReactDOM.render(
  <TodoApp />,
  document.getElementById('app')
);

Answer 2

I have tried to recreate the simple pagination example given by piotr-berebecki which was great. But when there will be a lot of pages then the pagination will overflow in the screen. So, I used previous and back button along with forward and backward button to stream back and forth between the pages. And for design part I have used bootstrap 3.

您可以使用pagebound值自定义要在分页中显示的页面数。确保对upperPageBound和pageBound使用相同的值。

    class TodoApp extends React.Component {
          constructor() {
            super();
            this.state = {
              todos: ['a','b','c','d','e','f','g','h','i','j','k','l','m',
'n','o','p','q','r','s','t','u','v','w','x','y','z'],
              currentPage: 1,
              todosPerPage: 3,
              upperPageBound: 3,
              lowerPageBound: 0,
              isPrevBtnActive: 'disabled',
              isNextBtnActive: '',
              pageBound: 3
            };
            this.handleClick = this.handleClick.bind(this);
            this.btnDecrementClick = this.btnDecrementClick.bind(this);
            this.btnIncrementClick = this.btnIncrementClick.bind(this);
            this.btnNextClick = this.btnNextClick.bind(this);
            this.btnPrevClick = this.btnPrevClick.bind(this);
            // this.componentDidMount = this.componentDidMount.bind(this);
            this.setPrevAndNextBtnClass = this.setPrevAndNextBtnClass.bind(this);
          }
          componentDidUpdate() {
                $("ul li.active").removeClass('active');
                $('ul li#'+this.state.currentPage).addClass('active');
          }
          handleClick(event) {
            let listid = Number(event.target.id);
            this.setState({
              currentPage: listid
            });
            $("ul li.active").removeClass('active');
            $('ul li#'+listid).addClass('active');
            this.setPrevAndNextBtnClass(listid);
          }
          setPrevAndNextBtnClass(listid) {
            let totalPage = Math.ceil(this.state.todos.length / this.state.todosPerPage);
            this.setState({isNextBtnActive: 'disabled'});
            this.setState({isPrevBtnActive: 'disabled'});
            if(totalPage === listid && totalPage > 1){
                this.setState({isPrevBtnActive: ''});
            }
            else if(listid === 1 && totalPage > 1){
                this.setState({isNextBtnActive: ''});
            }
            else if(totalPage > 1){
                this.setState({isNextBtnActive: ''});
                this.setState({isPrevBtnActive: ''});
            }
        }
          btnIncrementClick() {
              this.setState({upperPageBound: this.state.upperPageBound + this.state.pageBound});
              this.setState({lowerPageBound: this.state.lowerPageBound + this.state.pageBound});
              let listid = this.state.upperPageBound + 1;
              this.setState({ currentPage: listid});
              this.setPrevAndNextBtnClass(listid);
        }
          btnDecrementClick() {
            this.setState({upperPageBound: this.state.upperPageBound - this.state.pageBound});
            this.setState({lowerPageBound: this.state.lowerPageBound - this.state.pageBound});
            let listid = this.state.upperPageBound - this.state.pageBound;
            this.setState({ currentPage: listid});
            this.setPrevAndNextBtnClass(listid);
        }
        btnPrevClick() {
            if((this.state.currentPage -1)%this.state.pageBound === 0 ){
                this.setState({upperPageBound: this.state.upperPageBound - this.state.pageBound});
                this.setState({lowerPageBound: this.state.lowerPageBound - this.state.pageBound});
            }
            let listid = this.state.currentPage - 1;
            this.setState({ currentPage : listid});
            this.setPrevAndNextBtnClass(listid);
        }
        btnNextClick() {
            if((this.state.currentPage +1) > this.state.upperPageBound ){
                this.setState({upperPageBound: this.state.upperPageBound + this.state.pageBound});
                this.setState({lowerPageBound: this.state.lowerPageBound + this.state.pageBound});
            }
            let listid = this.state.currentPage + 1;
            this.setState({ currentPage : listid});
            this.setPrevAndNextBtnClass(listid);
        }
          render() {
            const { todos, currentPage, todosPerPage,upperPageBound,lowerPageBound,isPrevBtnActive,isNextBtnActive } = this.state;
            // Logic for displaying current todos
            const indexOfLastTodo = currentPage * todosPerPage;
            const indexOfFirstTodo = indexOfLastTodo - todosPerPage;
            const currentTodos = todos.slice(indexOfFirstTodo, indexOfLastTodo);

            const renderTodos = currentTodos.map((todo, index) => {
              return <li key={index}>{todo}</li>;
            });

            // Logic for displaying page numbers
            const pageNumbers = [];
            for (let i = 1; i <= Math.ceil(todos.length / todosPerPage); i++) {
              pageNumbers.push(i);
            }

            const renderPageNumbers = pageNumbers.map(number => {
                if(number === 1 && currentPage === 1){
                    return(
                        <li key={number} className='active' id={number}><a href='#' id={number} onClick={this.handleClick}>{number}</a></li>
                    )
                }
                else if((number < upperPageBound + 1) && number > lowerPageBound){
                    return(
                        <li key={number} id={number}><a href='#' id={number} onClick={this.handleClick}>{number}</a></li>
                    )
                }
            });
            let pageIncrementBtn = null;
            if(pageNumbers.length > upperPageBound){
                pageIncrementBtn = <li className=''><a href='#' onClick={this.btnIncrementClick}> &hellip; </a></li>
            }
            let pageDecrementBtn = null;
            if(lowerPageBound >= 1){
                pageDecrementBtn = <li className=''><a href='#' onClick={this.btnDecrementClick}> &hellip; </a></li>
            }
            let renderPrevBtn = null;
            if(isPrevBtnActive === 'disabled') {
                renderPrevBtn = <li className={isPrevBtnActive}><span id="btnPrev"> Prev </span></li>
            }
            else{
                renderPrevBtn = <li className={isPrevBtnActive}><a href='#' id="btnPrev" onClick={this.btnPrevClick}> Prev </a></li>
            }
            let renderNextBtn = null;
            if(isNextBtnActive === 'disabled') {
                renderNextBtn = <li className={isNextBtnActive}><span id="btnNext"> Next </span></li>
            }
            else{
                renderNextBtn = <li className={isNextBtnActive}><a href='#' id="btnNext" onClick={this.btnNextClick}> Next </a></li>
            }
            return (
              <div>
                  <ul>
                  {renderTodos}
                </ul>
                <ul id="page-numbers" className="pagination">
                  {renderPrevBtn}
                  {pageDecrementBtn}
                  {renderPageNumbers}
                  {pageIncrementBtn}
                  {renderNextBtn}
                </ul>
              </div>
            );
          }
        }


        ReactDOM.render(
          <TodoApp />,
          document.getElementById('app')
        );

工作演示链接：https : //codepen.io/mhmanandhar/pen/oEWBqx

图片：简单的反应分页

Answer 3

这是一种从react-bootstrap lib创建自定义分页组件的方法，您可以在整个项目中使用该组件

您的分页组件（pagination.jsx 或 js）

import React, { Component } from "react"; 
import { Pagination } from "react-bootstrap"; 
import PropTypes from "prop-types";

export default class PaginationHandler extends Component {  

   constructor(props) {
    super(props);
    this.state = {
      paging: {
        offset: 0,
        limit: 10
      },
      active: 0
    };  
    }

  pagingHandler = () => {
    let offset = parseInt(event.target.id);
    this.setState({
      active: offset
    });
    this.props.pageHandler(event.target.id - 1);   };

  nextHandler = () => {
    let active = this.state.active;
    this.setState({
      active: active + 1
    });
    this.props.pageHandler(active + 1);   };

  backHandler = () => {
    let active = this.state.active;
    this.setState({
      active: active - 1
    });
    this.props.pageHandler(active - 1);   };

  renderPageNumbers = (pageNumbers, totalPages) => {
    let { active } = this.state;
    return (
      <Pagination>
        <Pagination.Prev disabled={active < 5} onClick={ active >5 && this.backHandler} />

        {
      pageNumbers.map(number => {
              if (
                number >= parseInt(active) - 3 &&
                number <= parseInt(active) + 3 
              ) {
                return (
                  <Pagination.Item
                    id={number}
                    active={number == active}
                    onClick={this.pagingHandler}
                  >
                    {number}
                  </Pagination.Item>
                );
              } else {
                return null;
              }
        })}
        <Pagination.Next onClick={ active <= totalPages -4 && this.nextHandler} />
      </Pagination>
    );   };

  buildComponent = (props, state) => {
    const { totalPages } = props;
    const pageNumbers = [];
    for (let i = 1; i <= totalPages; i++) {
      pageNumbers.push(i);
    }
    return (
      <div className="pull-right">
      {this.renderPageNumbers(pageNumbers ,totalPages)}
      </div>
    );   
};

  render() {
    return this.buildComponent(this.props, this.state);
  } 

} 
   PaginationHandler.propTypes = 
   {
    paging: PropTypes.object,
    pageHandler: PropTypes.func,
    totalPages: PropTypes.object 
   };

在父组件中使用上述子组件，如下所示

import Pagination from "../pagination";

pageHandler = (offset) =>{
      this.setState(({ paging }) => ({
        paging: { ...paging, offset: offset }
      }));
   }
   render() {
    return (
      <div>
         <Pagination
          paging = {paging}
          pageHandler = {this.pageHandler}
          totalPages = {totalPages}>
          </Pagination>
      </div>
    );
  }