js实现预览简版
# pdfjs-dist
pdfjs-dist 是一个通用的 PDF.js 构建库。这是 PDF.js 源码的预先构建版本，可以通过构建脚本自动生成PDF.js。
# 插件逻辑
<template>
<Modal v-model="modal" width="80%" :title="title" class="no-footer-modal pdf-canvas">
<div class="scroll-pdf-contanier" id="scrollPdfBox">
<div v-for="index in pdfTotalPages" :key="index">
<canvas :ref="`scrollPdfCanvas${index}`" class="scroll-pdf-container"></canvas>
</div>
</div>
<div slot="footer"></div>
</Modal>
</template>
<script>
import pdfJS from 'pdfjs-dist'
export default {
name: 'pdf-view',
props: {
title: { type: String, default: 'PDF预览' }
},
data () {
return {
carouselModal: 0,
modal: false,
pageNo: null,
pdfPageNumber: null,
pdfTotalPages: 1,
renderingPage: false,
pdfData: null, // PDF的base64
scale: 4 // 缩放值
}
},
created () {
},
methods: {
showPdf (data) {
this.modal = true
this.$nextTick(() => {
data = atob(data.substring(data.indexOf(',') + 1))
this.loadPdfData(data)
})
},
loadPdfData (data) {
// 引入pdf.js的字体
let CMAP_URL = 'https://unpkg.com/pdfjs-dist@2.0.943/cmaps/'
// 读取base64的pdf流文件
this.pdfData = pdfJS.getDocument({
data: data, // PDF base64编码
cMapUrl: CMAP_URL,
cMapPacked: true
})
this.renderScrollPdf()
},
renderScrollPdf () {
this.pdfData.promise.then((pdf) => {
this.pdfTotalPages = pdf.numPages
this.renderScrollPdfPage(1)
})
},
// 渲染连续滚动PDF
renderScrollPdfPage (num) {
this.pdfData.promise.then((pdf) => {
let numPages = pdf.numPages
pdf.getPage(num).then((page) => {
let canvas = this.$refs[`scrollPdfCanvas${num}`][0]
let viewport = page.getViewport(this.scale)
// canvas.height = viewport.height * this.scale
// canvas.width = viewport.width * this.scale
canvas.height = viewport.height
canvas.width = viewport.width
let ctx = canvas.getContext('2d')
let renderContext = {
canvasContext: ctx,
viewport: viewport
}
page.render(renderContext).then(() => {
if (num < numPages) {
this.renderScrollPdfPage(num + 1)
}
})
})
})
}
}
}
</script>
<style lang="less">
.pdf-canvas {
.scroll-pdf-contanier {
width: 100%;
height: 800px;
// border: 1px dashed black;
position: relative;
display: flex;
flex-direction: column;
overflow-y: scroll;
.scroll-pdf-container {
width: 100%;
}
}
.ivu-modal {
top: 40px;
}
// .ivu-modal-content {
// background-color: transparent;
// box-shadow: none;
// }
// .ivu-modal-header,
// .ivu-modal-close {
// display: none;
// }
.ivu-modal-body {
max-height: initial;
overflow: auto;
}
}
</style>
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上次更新: 2024/01/18, 10:44:15