vue項(xiàng)目中常見的三種文件類型在線預(yù)覽實(shí)現(xiàn)(pdf/word/excel表格)
前言
之前做PDF預(yù)覽一直用的pdf.js,這次沒有太多附加需求比較簡(jiǎn)單簡(jiǎn),所以決定用vue-pdf這個(gè)組件,雖然說它沒有原生那樣強(qiáng)大,但已經(jīng)滿足常用的需求了,重要是這個(gè)組件使用簡(jiǎn)單。順便也把word文件和excel表格預(yù)覽也整理了下,接下來我們直接進(jìn)入正題!
一、預(yù)覽word文件
1.安裝 npm 依賴
npm i docx-preview@0.1.4 npm i jszip
2.預(yù)覽在線地址文件
<template> <div class="home"> <div ref="file"></div> </div> </template> <script> import axios from 'axios' const docx = require('docx-preview'); window.JSZip = require('jszip') export default { mounted(){ axios({ method: 'get', responseType: 'blob', // 設(shè)置響應(yīng)文件格式 url: '/docx', }).then(({data}) => { docx.renderAsync(data,this.$refs.file) // 渲染到頁面預(yù)覽 }) } } </script>
3.預(yù)覽本地文件
<template> <div class="my-component" ref="preview"> <input type="file" @change="preview" ref="file"> </div> </template> <script> const docx = require('docx-preview'); window.JSZip = require('jszip') export default { methods:{ preview(e){ docx.renderAsync(this.$refs.file.files[0],this.$refs.preview) // 渲染到頁面預(yù)覽 } } }; </script> <style lang="less" scoped> .my-component{ width: 100%; height: 90vh; border: 1px solid #000; } </style>
二、預(yù)覽excel表格
1.安裝依賴
npm i xlsx
2.預(yù)覽在線表格
<template> <div class="home"> <div v-html="tableau"></div> </div> </template> <script> import axios from 'axios' import XLSX from "xlsx"; export default { data(){ return { tableau: null, } }, mounted(){ axios.get('/xlsx',{ responseType: "arraybuffer", // 設(shè)置響應(yīng)體類型為arraybuffer }).then(({data})=> { let workbook = XLSX.read(new Uint8Array(data), {type:"array"}); // 解析數(shù)據(jù) var worksheet = workbook.Sheets[workbook.SheetNames[0]]; // workbook.SheetNames 下存的是該文件每個(gè)工作表名字,這里取出第一個(gè)工作表 this.tableau = XLSX.utils.sheet_to_html(worksheet); // 渲染 }) } } </script>
三、pdf預(yù)覽
1.安裝依賴vue-pdf
npm install --save vue-pdf
2.在需要的頁面注冊(cè)
<script> import PDF from 'vue-pdf' export default { components:{ PDF, }, data(){ return { } } </script>
3.使用
一般預(yù)覽pdf時(shí)都是很多頁的,為了提升性能可以做個(gè)分頁。page: 當(dāng)前顯示的頁數(shù),比如第一頁page=1;rotate : 旋轉(zhuǎn)角度,比如0就是不旋轉(zhuǎn),+90,-90 就是水平旋轉(zhuǎn)。progress :當(dāng)前頁面的加載進(jìn)度,范圍是0-1 ,等于1的時(shí)候代表當(dāng)前頁已經(jīng)完全加載完成了。page-loaded :頁面加載成功的回調(diào)函數(shù),不咋能用到。num-pages :總頁數(shù);error :加載錯(cuò)誤的回調(diào)link-clicked:?jiǎn)螜C(jī)pdf內(nèi)的鏈接會(huì)觸發(fā)。print 這個(gè)是打印函數(shù)。(注意:谷歌瀏覽器預(yù)覽時(shí)會(huì)出現(xiàn)亂碼,這個(gè)問題是因?yàn)槟鉷df中使用了自定義字體導(dǎo)致的。若要解決須替換node_modules/vue-pdf/src/pdfjsWrapper.js,替換的pdfjsWrapper.js我放在文章最后)
<!-- 預(yù)覽PDF --> <el-dialog v-dialogDrag :visible.sync="previewDialog"> <template> <div> <div class="tools"> <el-button :theme="'default'" type="submit" :title="'上一頁'" @click.stop="prePage" class="mr10"> 上一頁</el-button> <el-button :theme="'default'" type="submit" :title="'下一頁'" @click.stop="nextPage" class="mr10"> 下一頁</el-button> <div class="page">{{pageNum}}/{{pageTotalNum}} </div> <el-button :theme="'default'" type="submit" :title="'順時(shí)針旋轉(zhuǎn)'" @click.stop="clock" class="mr10"> 順時(shí)針旋轉(zhuǎn)</el-button> <el-button :theme="'default'" type="submit" :title="'逆時(shí)針旋轉(zhuǎn)'" @click.stop="counterClock" class="mr10"> 逆時(shí)針旋轉(zhuǎn)</el-button> <el-button :theme="'default'" type="submit" :title="'打印'" @click.stop="pdfPrintAll" class="mr10"> 打印</el-button> </div> <pdf ref="pdf" :src="url" :page="pageNum" :rotate="pageRotate" @progress="loadedRatio = $event" @page-loaded="pageLoaded($event)" @num-pages="pageTotalNum=$event" @error="pdfError($event)" @link-clicked="page = $event"></pdf> </div> </template> </el-dialog> <script> import PDF from 'vue-pdf' export default { components:{ PDF, }, data(){ return { previewDialog:false, url: "http://storage.xuetangx.com/public_assets/xuetangx/PDF/PlayerAPI_v1.0.6.pdf", pageNum: 1, pageTotalNum: 1, pageRotate: 0, // 加載進(jìn)度 loadedRatio: 0, curPageNum: 0, }, methods:{ /** * 預(yù)覽PDF */ previewPDF(row,index) { this.previewDialog = true; console.log("", row,index); }, // 上一頁函數(shù), prePage() { var page = this.pageNum page = page > 1 ? page - 1 : this.pageTotalNum this.pageNum = page }, // 下一頁函數(shù) nextPage() { var page = this.pageNum page = page < this.pageTotalNum ? page + 1 : 1 this.pageNum = page }, // 頁面順時(shí)針翻轉(zhuǎn)90度。 clock() { this.pageRotate += 90 }, // 頁面逆時(shí)針翻轉(zhuǎn)90度。 counterClock() { this.pageRotate -= 90 }, // 頁面加載回調(diào)函數(shù),其中e為當(dāng)前頁數(shù) pageLoaded(e) { this.curPageNum = e }, // 錯(cuò)誤時(shí)回調(diào)函數(shù)。 pdfError(error) { console.error(error) }, // 打印全部 pdfPrintAll() { /** * 打印界面字符亂碼是因?yàn)槟鉷df中使用了自定義字體導(dǎo)致的,谷歌瀏覽器打印的時(shí)候預(yù)覽界面真的變成了真·方塊字 ,解決方案如下: * 用文章最后的pdfjsWrapper.js在替換掉node_modules/vue-pdf/src/pdfjsWrapper.js */ console.log("打印"); this.$refs.pdf.print() }, }, } </script>
4.加載本地pdf文件
如果需要加載本地pdf文件(不需要?jiǎng)t不用配置),需要我們做一下本地配置flie-loader才行,否則webpack無法編譯pdf類型的文件,配置方法也很簡(jiǎn)單,在項(xiàng)目根目錄找到vue.config.js文件(若沒有則在根目錄下新建一個(gè)vue.config.js)。之后再url:require("…/assets/xxx.pdf")就沒有任何問題了,注意,vue-pdf src接收的是string對(duì)象,如果直接傳url這里報(bào)錯(cuò)了,需要傳url.default一下。
先安裝file-loader
npm install --save file-loader
然后在vue.config.js中加入以下內(nèi)容:
module.exports = { chainWebpack: config => { const fileRule = config.module.rule('file') fileRule.uses.clear() fileRule .test(/\.pdf|ico$/) .use('file-loader') .loader('file-loader') .options({ limit: 10000, }) }, publicPath: './' }
5.解決pdf使用自定義字體預(yù)覽和打印亂碼問題:pdfjsWrapper.js
import { PDFLinkService } from 'pdfjs-dist/es5/web/pdf_viewer'; var pendingOperation = Promise.resolve(); export default function(PDFJS) { function isPDFDocumentLoadingTask(obj) { return typeof(obj) === 'object' && obj !== null && obj.__PDFDocumentLoadingTask === true; // or: return obj.constructor.name === 'PDFDocumentLoadingTask'; } function createLoadingTask(src, options) { var source; if ( typeof(src) === 'string' ) source = { url: src }; else if ( src instanceof Uint8Array ) source = { data: src }; else if ( typeof(src) === 'object' && src !== null ) source = Object.assign({}, src); else throw new TypeError('invalid src type'); // source.verbosity = PDFJS.VerbosityLevel.INFOS; // source.pdfBug = true; // source.stopAtErrors = true; if ( options && options.withCredentials ) source.withCredentials = options.withCredentials; var loadingTask = PDFJS.getDocument(source); loadingTask.__PDFDocumentLoadingTask = true; // since PDFDocumentLoadingTask is not public if ( options && options.onPassword ) loadingTask.onPassword = options.onPassword; if ( options && options.onProgress ) loadingTask.onProgress = options.onProgress; return loadingTask; } function PDFJSWrapper(canvasElt, annotationLayerElt, emitEvent) { var pdfDoc = null; var pdfPage = null; var pdfRender = null; var canceling = false; canvasElt.getContext('2d').save(); function clearCanvas() { canvasElt.getContext('2d').clearRect(0, 0, canvasElt.width, canvasElt.height); } function clearAnnotations() { while ( annotationLayerElt.firstChild ) annotationLayerElt.removeChild(annotationLayerElt.firstChild); } this.destroy = function() { if ( pdfDoc === null ) return; // Aborts all network requests and destroys worker. pendingOperation = pdfDoc.destroy(); pdfDoc = null; } this.getResolutionScale = function() { return canvasElt.offsetWidth / canvasElt.width; } this.printPage = function(dpi, pageNumberOnly) { if ( pdfPage === null ) return; // 1in == 72pt // 1in == 96px var PRINT_RESOLUTION = dpi === undefined ? 150 : dpi; var PRINT_UNITS = PRINT_RESOLUTION / 72.0; var CSS_UNITS = 96.0 / 72.0; var printContainerElement = document.createElement('div'); printContainerElement.setAttribute('id', 'print-container') function removePrintContainer() { printContainerElement.parentNode.removeChild(printContainerElement); } new Promise(function(resolve, reject) { printContainerElement.frameBorder = '0'; printContainerElement.scrolling = 'no'; printContainerElement.width = '0px;' printContainerElement.height = '0px;' printContainerElement.style.cssText = 'position: absolute; top: 0; left: 0'; window.document.body.appendChild(printContainerElement); resolve(window) }) .then(function(win) { win.document.title = ''; return pdfDoc.getPage(1) .then(function(page) { var viewport = page.getViewport({ scale: 1 }); printContainerElement.appendChild(win.document.createElement('style')).textContent = '@supports ((size:A4) and (size:1pt 1pt)) {' + '@page { margin: 1pt; size: ' + ((viewport.width * PRINT_UNITS) / CSS_UNITS) + 'pt ' + ((viewport.height * PRINT_UNITS) / CSS_UNITS) + 'pt; }' + '}' + '#print-canvas { display: none }' + '@media print {' + 'body { margin: 0 }' + '#print-canvas { page-break-before: avoid; page-break-after: always; page-break-inside: avoid; display: block }' + 'body > *:not(#print-container) { display: none; }' + '}'+ '@media screen {' + 'body { margin: 0 }' + '}' return win; }) }) .then(function(win) { var allPages = []; for ( var pageNumber = 1; pageNumber <= pdfDoc.numPages; ++pageNumber ) { if ( pageNumberOnly !== undefined && pageNumberOnly.indexOf(pageNumber) === -1 ) continue; allPages.push( pdfDoc.getPage(pageNumber) .then(function(page) { var viewport = page.getViewport({ scale: 1 }); var printCanvasElt = printContainerElement.appendChild(win.document.createElement('canvas')); printCanvasElt.setAttribute('id', 'print-canvas') printCanvasElt.width = (viewport.width * PRINT_UNITS); printCanvasElt.height = (viewport.height * PRINT_UNITS); return page.render({ canvasContext: printCanvasElt.getContext('2d'), transform: [ // Additional transform, applied just before viewport transform. PRINT_UNITS, 0, 0, PRINT_UNITS, 0, 0 ], viewport: viewport, intent: 'print' }).promise; }) ); } Promise.all(allPages) .then(function() { win.focus(); // Required for IE if (win.document.queryCommandSupported('print')) { win.document.execCommand('print', false, null); } else { win.print(); } removePrintContainer(); }) .catch(function(err) { removePrintContainer(); emitEvent('error', err); }) }) } this.renderPage = function(rotate) { if ( pdfRender !== null ) { if ( canceling ) return; canceling = true; pdfRender.cancel().catch(function(err) { emitEvent('error', err); }); return; } if ( pdfPage === null ) return; var pageRotate = (pdfPage.rotate === undefined ? 0 : pdfPage.rotate) + (rotate === undefined ? 0 : rotate); var scale = canvasElt.offsetWidth / pdfPage.getViewport({ scale: 1 }).width * (window.devicePixelRatio || 1); var viewport = pdfPage.getViewport({ scale: scale, rotation:pageRotate }); emitEvent('page-size', viewport.width, viewport.height, scale); canvasElt.width = viewport.width; canvasElt.height = viewport.height; pdfRender = pdfPage.render({ canvasContext: canvasElt.getContext('2d'), viewport: viewport }); annotationLayerElt.style.visibility = 'hidden'; clearAnnotations(); var viewer = { scrollPageIntoView: function(params) { emitEvent('link-clicked', params.pageNumber) }, }; var linkService = new PDFLinkService(); linkService.setDocument(pdfDoc); linkService.setViewer(viewer); pendingOperation = pendingOperation.then(function() { var getAnnotationsOperation = pdfPage.getAnnotations({ intent: 'display' }) .then(function(annotations) { PDFJS.AnnotationLayer.render({ viewport: viewport.clone({ dontFlip: true }), div: annotationLayerElt, annotations: annotations, page: pdfPage, linkService: linkService, renderInteractiveForms: false }); }); var pdfRenderOperation = pdfRender.promise .then(function() { annotationLayerElt.style.visibility = ''; canceling = false; pdfRender = null; }) .catch(function(err) { pdfRender = null; if ( err instanceof PDFJS.RenderingCancelledException ) { canceling = false; this.renderPage(rotate); return; } emitEvent('error', err); }.bind(this)) return Promise.all([getAnnotationsOperation, pdfRenderOperation]); }.bind(this)); } this.forEachPage = function(pageCallback) { var numPages = pdfDoc.numPages; (function next(pageNum) { pdfDoc.getPage(pageNum) .then(pageCallback) .then(function() { if ( ++pageNum <= numPages ) next(pageNum); }) })(1); } this.loadPage = function(pageNumber, rotate) { pdfPage = null; if ( pdfDoc === null ) return; pendingOperation = pendingOperation.then(function() { return pdfDoc.getPage(pageNumber); }) .then(function(page) { pdfPage = page; this.renderPage(rotate); emitEvent('page-loaded', page.pageNumber); }.bind(this)) .catch(function(err) { clearCanvas(); clearAnnotations(); emitEvent('error', err); }); } this.loadDocument = function(src) { pdfDoc = null; pdfPage = null; emitEvent('num-pages', undefined); if ( !src ) { canvasElt.removeAttribute('width'); canvasElt.removeAttribute('height'); clearAnnotations(); return; } // wait for pending operation ends pendingOperation = pendingOperation.then(function() { var loadingTask; if ( isPDFDocumentLoadingTask(src) ) { if ( src.destroyed ) { emitEvent('error', new Error('loadingTask has been destroyed')); return } loadingTask = src; } else { loadingTask = createLoadingTask(src, { onPassword: function(updatePassword, reason) { var reasonStr; switch (reason) { case PDFJS.PasswordResponses.NEED_PASSWORD: reasonStr = 'NEED_PASSWORD'; break; case PDFJS.PasswordResponses.INCORRECT_PASSWORD: reasonStr = 'INCORRECT_PASSWORD'; break; } emitEvent('password', updatePassword, reasonStr); }, onProgress: function(status) { var ratio = status.loaded / status.total; emitEvent('progress', Math.min(ratio, 1)); } }); } return loadingTask.promise; }) .then(function(pdf) { pdfDoc = pdf; emitEvent('num-pages', pdf.numPages); emitEvent('loaded'); }) .catch(function(err) { clearCanvas(); clearAnnotations(); emitEvent('error', err); }) } annotationLayerElt.style.transformOrigin = '0 0'; } return { createLoadingTask: createLoadingTask, PDFJSWrapper: PDFJSWrapper, } }
總結(jié)
到此這篇關(guān)于vue項(xiàng)目中常見的三種文件類型在線預(yù)覽實(shí)現(xiàn)的文章就介紹到這了,更多相關(guān)vue文件在線預(yù)覽內(nèi)容請(qǐng)搜索腳本之家以前的文章或繼續(xù)瀏覽下面的相關(guān)文章希望大家以后多多支持腳本之家!
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