vue3项目打开本地pdf文件实现方法-Toy模板网

这篇具有很好参考价值的文章主要介绍了vue3项目打开本地pdf文件实现方法。希望对大家有所帮助。如果存在错误或未考虑完全的地方，请大家不吝赐教，您也可以点击"举报违法"按钮提交疑问。

效果图

vue3项目打开本地pdf文件实现方法,vue3,pdf,vue3,javascript

引入pdf插件

注意一定要这个版本，不然会报错key.split(...).at is not a function

 npm install pdfjs-dist@2.12.313

pdf页面封装

<template>
  <div class="pdf-container">
    <canvas
      v-for="page in pdfPages"
      :key="page"
      :id="`pdf-canvas-${page}`" />
    <el-backtop :right="100" :bottom="100">
      <div class="backtop">返回顶部</div>
    </el-backtop>
  </div>
</template>

<script setup>
//一定要引入下面两个依赖文件
import * as PdfJs from 'pdfjs-dist';
import * as worker from 'pdfjs-dist/build/pdf.worker.entry';

import { nextTick, ref, watchEffect } from 'vue';
import { useRoute, useRouter } from 'vue-router';//引入路由
  
const route = useRoute();

let pdfDoc = null;        // pdf整体实例
const pdfPages = ref(0);  // pdf文件总页数
const pdfScale = ref(2.0);// pdf文件预览缩放

const loadFile = (url) => {
  PdfJs.GlobalWorkerOptions.workerSrc = worker;
  // PdfJs.disableWorker = true;
  //通过getDocument获取到PDf文档
  const loadingTask = PdfJs.getDocument(url);
  loadingTask.promise.then((pdf) => {
    pdfDoc = pdf; // 文件流
    pdfPages.value = pdf.numPages; // 文件总页数
    nextTick(() => {
      renderPage(1);
    });
  })
  .catch((error) => {
    console.log(error);
  });
};
const renderPage = (num) => {
  // 页数检测
  if (num <= 0 || num > pdfPages.value) {
    return;
  }
  pdfDoc.getPage(num).then((page) => {
    const canvas = document.getElementById(`pdf-canvas-${num}`);
    const ctx = canvas.getContext('2d');
    //dpr和bsr设置pdf的比例尺寸
    const dpr = window.devicePixelRatio || 1;
    const bsr = ctx.webkitBackingStorePixelRatio ||
                ctx.mozBackingStorePixelRatio ||
                ctx.msBackingStorePixelRatio ||
                ctx.oBackingStorePixelRatio ||
                1;
    const ratio = dpr / bsr;
    const viewport = page.getViewport({ scale: pdfScale.value }); // 文件显示比例
    canvas.width = viewport.width * ratio;
    canvas.height = viewport.height * ratio;
    canvas.style.width = viewport.width + 'px';
    canvas.style.height = viewport.height + 'px';
    ctx.setTransform(ratio, 0, 0, ratio, 0, 0); // 设置当pdf文件处于缩小或放大状态时，可以拖动

    // 将pdf文件的内容渲染到canvas中
    const renderContext = {
      canvasContext: ctx,
      viewport: viewport
    };
    page.render(renderContext);

    if (num < pdfPages.value) {
      renderPage(num + 1);
    }
  })
  .catch((error) => {
    console.log(error);
  });
};

watchEffect(() => {
  //我这里是菜单直接跳转，所以通过获取路由
  let pdfUrl = `/pdfs${route.query.pdfUrl}`;
  loadFile(pdfUrl);
});
</script>

<style scoped>
.pdf-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
  height: 100%;
}
.backtop {
  height: 100%;
  width: 100%;
  background-color: #ffffff;
  box-shadow: 0px 0px 6px rgba(0, 0, 0, .12);
  text-align: center;
  line-height: 20px;
  font-size: 16px;
  color: #1989fa;
}
</style>