react 分页实现

分页组件实现

使用React实现分页功能通常需要结合状态管理、数据请求和UI渲染。以下是两种常见的实现方式：

基础分页组件

import { useState } from 'react';

function Pagination({ totalItems, itemsPerPage, onPageChange }) {
  const [currentPage, setCurrentPage] = useState(1);
  const totalPages = Math.ceil(totalItems / itemsPerPage);

  const handleClick = (page) => {
    setCurrentPage(page);
    onPageChange(page);
  };

  return (
    <div className="pagination">
      <button 
        disabled={currentPage === 1}
        onClick={() => handleClick(currentPage - 1)}
      >
        Previous
      </button>

      {Array.from({ length: totalPages }, (_, i) => i + 1).map(page => (
        <button
          key={page}
          onClick={() => handleClick(page)}
          className={currentPage === page ? 'active' : ''}
        >
          {page}
        </button>
      ))}

      <button
        disabled={currentPage === totalPages}
        onClick={() => handleClick(currentPage + 1)}
      >
        Next
      </button>
    </div>
  );
}

API数据分页集成

与后端API集成时，通常需要处理分页参数和响应数据：

import { useState, useEffect } from 'react';
import axios from 'axios';

function DataList() {
  const [data, setData] = useState([]);
  const [currentPage, setCurrentPage] = useState(1);
  const [totalPages, setTotalPages] = useState(0);
  const itemsPerPage = 10;

  useEffect(() => {
    const fetchData = async () => {
      const response = await axios.get(`/api/items?page=${currentPage}&limit=${itemsPerPage}`);
      setData(response.data.items);
      setTotalPages(response.data.totalPages);
    };
    fetchData();
  }, [currentPage]);

  return (
    <div>
      {/* 渲染数据列表 */}
      <Pagination 
        currentPage={currentPage}
        totalPages={totalPages}
        onPageChange={setCurrentPage}
      />
    </div>
  );
}

高级分页功能

对于更复杂的分页需求，可以考虑以下增强功能：

页码范围优化

const getPageNumbers = () => {
  const maxVisiblePages = 5;
  let startPage = Math.max(1, currentPage - Math.floor(maxVisiblePages / 2));
  let endPage = startPage + maxVisiblePages - 1;

  if (endPage > totalPages) {
    endPage = totalPages;
    startPage = Math.max(1, endPage - maxVisiblePages + 1);
  }

  return Array.from({ length: endPage - startPage + 1 }, (_, i) => startPage + i);
};

分页样式优化

.pagination {
  display: flex;
  gap: 8px;
}

.pagination button {
  padding: 6px 12px;
  border: 1px solid #ddd;
  background: white;
  cursor: pointer;
}

.pagination button.active {
  background: #007bff;
  color: white;
  border-color: #007bff;
}

.pagination button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

使用现成库

对于快速实现，可以考虑使用现成的React分页库：

• react-paginate
• material-ui pagination
• antd pagination

安装示例：

npm install react-paginate

使用示例：

import ReactPaginate from 'react-paginate';

function PaginatedItems({ itemsPerPage, items }) {
  const [itemOffset, setItemOffset] = useState(0);
  const endOffset = itemOffset + itemsPerPage;
  const currentItems = items.slice(itemOffset, endOffset);
  const pageCount = Math.ceil(items.length / itemsPerPage);

  const handlePageClick = (event) => {
    const newOffset = (event.selected * itemsPerPage) % items.length;
    setItemOffset(newOffset);
  };

  return (
    <>
      <Items currentItems={currentItems} />
      <ReactPaginate
        breakLabel="..."
        nextLabel="next >"
        onPageChange={handlePageClick}
        pageRangeDisplayed={5}
        pageCount={pageCount}
        previousLabel="< previous"
        renderOnZeroPageCount={null}
      />
    </>
  );
}