react-pdf预览在线PDF的使用

标签：const react useState import PDF pdf

1、在react项目中安装react-pdf依赖包

建议安装8.0.2版本的react-pdf，如果安装更高版本的可能出现一些浏览器的兼容性问题；

npm install [email protected] -S

1、PC端的使用

1.1、封装一个组件：PdfViewModal.tsx

import React, { useState } from 'react'
import { Modal, Spin, Alert } from 'antd'
import { Document, Page, pdfjs } from 'react-pdf'
import 'react-pdf/dist/esm/Page/AnnotationLayer.css'
import 'react-pdf/dist/esm/Page/TextLayer.css';

// 配置 PDF.js 的 worker 文件
pdfjs.GlobalWorkerOptions.workerSrc = new URL('pdfjs-dist/build/pdf.worker.min.js', import.meta.url).toString()

interface PDFPreviewModalProps {
  fileName: string | null
  fileUrl: string | null // 传入的 PDF 文件地址
  onCancel: () => void // 关闭弹框的回调
}

const PDFPreviewModal: React.FC<PDFPreviewModalProps> = ({ fileName, fileUrl, onCancel }) => {
  const [numPages, setNumPages] = useState<number | null>(null)
  const [pdfWidth, setPdfWidth] = useState<number>(600) // 默认宽度为 600px
  const [loading, setLoading] = useState<boolean>(true) // 控制加载状态
  const [error, setError] = useState<boolean>(false) // 控制加载错误状态
  
  // 当 PDF 加载成功时，设置页面数量
  const onDocumentLoadSuccess = ({ numPages }: { numPages: number }) => {
    setNumPages(numPages)
    setLoading(false) // 加载成功后，隐藏 loading
  }

  // 加载失败时，设置错误状态
  const onDocumentLoadError = () => {
    setLoading(false)
    setError(true) // 出错时显示错误提示
  }

  // 获取 PDF 页面加载后的宽度
  const onPageLoadSuccess = ({ width }: { width: number }) => {
    setPdfWidth(width)
  }

  return (
    <Modal
      title={`【${fileName}】预览`}
      open
      onCancel={onCancel}
      footer={null}
      width={pdfWidth + 100}
      style={{ top: 20 }}
    >
      {error ? (
        <Alert message="加载 PDF 文件失败" type="error" showIcon />
      ) : (
        <>
          {loading && (
            <div style={{ display: 'flex', justifyContent: 'center', alignItems: 'center', height: '80vh' }}>
              <Spin size="large" />
            </div>
          )}
          {fileUrl && (
            <>
            <div style={{ height: '88vh', overflowY: 'auto', padding: '24px' }}>
              <Document
                //file={new URL('/public/temp/DXF文件要求.pdf',import.meta.url).toString()}
                file={fileUrl}
                onl oadSuccess={onDocumentLoadSuccess}
                onl oadError={onDocumentLoadError}
              >
                {Array.from(new Array(numPages), (el, index) => (
                  <Page key={`page_${index + 1}`} pageNumber={index + 1} onl oadSuccess={onPageLoadSuccess} />
                ))}
              </Document>
            </div>
            </>
          )}
        </>
      )}
    </Modal>
  )
}

export default PDFPreviewModal

1.2、业务代码中引入该组件

import React, { useState, useEffect, useCallback } from 'react'
import { Form } from 'antd'
import { List } from 'antd'
import PDFPreviewModal from '@/components/PdfViewModal.tsx'

const PdfTest = (props: any) => {
  const [previewFile, setPreviewFile] = useState<any>()

 const onTestPdf = () => {
　　setPreviewFile({
　　　　fileName: 'abc.pdf',
　　　　fileUrl: 'http://****/abc.pdf'
　　})
 }return (
    <div className="mrUp mrLink">   
　　　<div onClick={onTestPdf}>测试预览PDF</div>

      {!!previewFile?.publicFileUrl && (
        <PDFPreviewModal
          fileName={previewFile?.fileName}
          fileUrl={previewFile?.publicFileUrl}
          onCancel={() => setPreviewFile('')}
        />
      )}
    </div>
  )
}

export default PdfTest

2、H5移动端的使用

移动端加入放大、缩小、上一页、下一页的功能；

2.1、封装一个组件：PDFViwer.tsx

import React, { useState } from 'react';
import { Button, Modal, Space, Toast, Divider } from 'antd-mobile'
import { UpOutline, DownOutline, AddCircleOutline, MinusCircleOutline } from 'antd-mobile-icons'
import { Document, Page, pdfjs } from 'react-pdf';
import 'react-pdf/dist/esm/Page/AnnotationLayer.css'; // 样式导入
import 'react-pdf/dist/esm/Page/TextLayer.css'

// 配置 PDF.js 的 worker 文件
pdfjs.GlobalWorkerOptions.workerSrc = new URL('pdfjs-dist/build/pdf.worker.min.js', import.meta.url).toString()

interface PDFPreviewModalProps {
  fileUrl: string | null; // 传入的 PDF 文件地址
}

const styleBtnDv = {
  display: 'flex',
  justifyContent: 'center',
  height: '1rem',
  alignItems: 'center',
  gap: '0.4rem',
  margin: '0.3rem 1rem',
  padding: '0 0.6rem',
  background: '#444',
  borderRadius: '0.5rem'
}

const styleBtn = {
  flex: 1,
  display: 'flex',
  justifyContent: 'center',
  height: '0.6rem',
  alignItems: 'center',
}

// PDF预览功能
const PDFViwer: React.FC<PDFPreviewModalProps> = ({ fileUrl }) => {
  const [pageNumber, setPageNumber] = useState(1);
  const [numPages, setNumPages] = useState(1);
  const [scale, setScale] = useState(0.65);

  // 当 PDF 加载成功时，设置页面数量
  const onDocumentLoadSuccess = ({ numPages }: { numPages: number }) => {
    setNumPages(numPages);
  };

  //上一页
  function lastPage() {

    if (pageNumber == 1) {
      Toast.show({
        content: '已是第一页'
      })
      return;
    }
    const page = pageNumber - 1;
    setPageNumber(page);
  }
  //下一页
  function nextPage() {
    if (pageNumber == numPages) {
      Toast.show("已是最后一页");
      return;
    }
    const page = pageNumber + 1;
    setPageNumber(page);
  }
  //缩小
  function pageZoomOut() {
    if (scale <= 0.3) {
      Toast.show("已缩放至最小");
      return;
    }
    const newScale = scale - 0.1;
    setScale(newScale);
  }

  //放大
  function pageZoomIn() {
    if (scale >= 5) {
      Toast.show("已放大至最大");
      return;
    }
    const newScale = scale + 0.1;
    setScale(newScale);
  }

  return (
    <div>
      {/* 预览 PDF 文件 */}
      {fileUrl ? (
        <div style={{ height: 'calc(100vh - 4.5rem)', overflowY: 'auto', padding: '24px' }}>
          <Document
            // 写死的pdf文件地址，用于本地测试使用，打包提交前需要注释掉
            // file={new URL("/public/temp/AI销售助手-宽带&套餐&战新.pdf", import.meta.url).toString()}
            // 真实传入的pdf地址
            file={fileUrl}
            onl oadSuccess={onDocumentLoadSuccess}
          >
            <Page pageNumber={pageNumber} scale={scale} />
          </Document>
        </div>
      ) : (
        <p>没有选择文件</p>
      )}
      <div style={styleBtnDv}>
        <div style={styleBtn} onClick={lastPage}><UpOutline color='#fff' fontSize={'0.6rem'} /></div>
        <div style={{ color: '#fff', fontSize: '0.35rem', ...styleBtn }}>{pageNumber}/{numPages}</div>
        <div style={styleBtn} onClick={nextPage}><DownOutline color='#fff' fontSize={'0.6rem'} /></div>
        <div style={styleBtn} onClick={pageZoomIn}><AddCircleOutline color='#fff' fontSize={'0.6rem'} /></div>
        <div style={styleBtn} onClick={pageZoomOut}><MinusCircleOutline color='#fff' fontSize={'0.6rem'} /></div>
      </div>
    </div>
  );
};

export default PDFViwer;

2.2、业务代码中引入该组件

import React, { useMemo, useRef, useState } from 'react'
import { ErrorBlock, Swiper, SwiperRef, Popup, } from 'antd-mobile'
import PDFViwer from '@/components/PDFViwer';

const ellipsis1 = {
  "white-space": "nowrap",
  "overflow": "hidden",
  "text-overflow": "ellipsis",
}

const IntroduceDocList = (props: any) => {
  const { loading, introduceDocList } = props
  // const introduceDocList = [
  //   {publicFileUrl: '/public/temp/DXF文件要求.pdf', fileName:'DXF文件要求.pdf'},
  //   {publicFileUrl: '/public/temp/AI销售助手-宽带&套餐&战新.pdf', fileName:'AI销售助手-宽带&套餐&战新.pdf'},
  // ]

const [introduceDocList, setIntroduceDocList] = useState({
　　{publicFileUrl: 'http://****/abc.pdf', fileName:'abc.pdf'},
    {publicFileUrl: 'http://****/def.pdf', fileName:'def.pdf'},
 });

  const [pdf, setPdf] = useState({ id: 1 });
  const [showPdfViwer, setShowPdfViwer] = useState(false)

  const onOpenPdfViewer = (item) => {
    console.log(item);
    setPdf(item);
    setShowPdfViwer(true);
  }

  return (
      <div>
        {
          introduceDocList?.map(item => (
            <div data-url={item?.publicFileUrl} style={{ marginBottom: '0.3rem', fontSize: '0.4rem' }}>
              <span style={{color:'#0B75FF'}} onClick={() => onOpenPdfViewer(item)}>{item.fileName}</span>
            </div>
          ))
        }
        <Popup
          position='right'
          visible={showPdfViwer}
          showCloseButton
          bodyStyle={{ width: '100%' }}
          destroyOnClose={true}
          onClose={() => {
            setShowPdfViwer(false)
            setPdf({ id: 1 })
          }}
        >
          <div style={{ padding: '0.3rem 1rem', fontSize: '0.35rem', fontWeight: 600, textAlign:'center', ...ellipsis1 }}>{pdf?.fileName}</div>
          <div style={{ height: '100%' }} data-url={pdf?.publicFileUrl}>
            <PDFViwer fileUrl={pdf?.publicFileUrl} />
          </div>
        </Popup>
      </div>
  )
}
export default IntroduceDocList

效果图：

注意：挡在本地开发时，如果预览的pdf文件地址是线上地址，则会报跨域的问题，需要服务端解决跨域问题。

标签：const,react,useState,import,PDF,pdf
From： https://www.cnblogs.com/libo0125ok/p/18414292