解決vue-pdf檢視pdf檔案及列印亂碼的問題
阿新 • • 發佈：2020-11-04
前言
vue中簡單使用vue-pdf預覽pdf檔案，解決列印預覽亂碼問題
vue-pdf 使用
安裝
npm install --save vue-pdf
引入
import pdf from "vue-pdf
自定義封裝pdf預覽元件
<template>
<el-dialog
:visible.sync="pdfDialog"
:close-on-click-modal="false"
:show-close="false"
width="900px"
top="52px"
>
<div class="pdf" v-show="fileType == 'pdf'">
<p class="arrow">
<!-- 上一頁 -->
<span
@click="changePdfPage(0)"
class="currentPage"
:class="{ grey: currentPage == 1 }"
>上一頁 </span
>
<span style="color: #8c8e92;">{{ currentPage }} / {{ pageCount }}</span>
<!-- 下一頁 -->
<span
@click="changePdfPage(1)"
class="currentPage"
:class="{ grey: currentPage == pageCount }"
> 下一頁</span
> <button @click="$refs.pdf.print()">下載</button>
<span
style="float :right;padding-right:40px;font-size: 20px;color: #8c8e92;cursor: pointer;"
@click="close"
><i class="el-icon-close"></i
></span>
</p>
<!-- loadPdfHandler：載入事件 src：需要展示的PDF地址；currentPage：當前展示的PDF頁碼；pageCount=$event：PDF檔案總頁碼；currentPage=$event：一開始載入的頁面-->
<pdf
ref="pdf"
:src="src"
:page="currentPage"
@num-pages="pageCount = $event"
@page-loaded="currentPage = $event"
@loaded="loadPdfHandler"
></pdf>
</div>
</el-dialog>
</template>
<script>
import pdf from "vue-pdf";
export default {
components: { pdf },props: ["src"],data() {
return {
filesProps: {
label: "originName"
},pdfDialog: false,currentPage: 0,// pdf檔案頁碼
pageCount: 0,// pdf檔案總頁數
fileType: "pdf" // 檔案型別
};
},methods: {
// 改變PDF頁碼,val傳過來區分上一頁下一頁的值,0上一頁,1下一頁
changePdfPage(val) {
if (val === 0 && this.currentPage > 1) {
this.currentPage--;
}
if (val === 1 && this.currentPage < this.pageCount) {
this.currentPage++;
}
},// pdf載入時
loadPdfHandler() {
this.currentPage = 1; // 載入的時候先載入第一頁
},handleOpen() {
this.pdfDialog = true;
},//關閉彈框
close() {
this.pdfDialog = false;
}
}
};
</script>
<style lang="stylus">
.currentPage {
cursor: pointer;
color: #8c8e92;
}
.currentPage:hover {
color: #2761ff;
}
.arrow{
position: fixed;
top: 0px;
left :0px;
z-index: 2;
width: 100%;
background-color: #191919;
padding: 12px 0;
margin: 0;
text-align :center;
}
>>>.el-dialog__body {
color: #606266;
font-size: 14px;
padding:0;
}
</style>
使用
<template>
<el-container>
<el-header>
<el-card>
<div>
<el-button
style="font-style:oblique;font-size: 18px;"
@click="handlePreviewFile"
>PDF 預覽</el-button
>
<el-button
style="float: right;line-height: 40px;padding: 3px;"
type="text"
@click="handleSafetyExperience"
><i class="el-icon-caret-left">返回</i></el-button
>
</div>
</el-card>
</el-header>
<el-main>
<el-card class="card-style">
<pdf-preview ref="pdfSearch" :src="src"></pdf-preview>
</el-card>
</el-main>
</el-container>
</template>
<script>
import PdfPreview from "../widget/PdfPreview";
export default {
name: "InfoExperience",components: {
PdfPreview
},data() {
return {
src:
"http://storage.xuetangx.com/public_assets/xuetangx/PDF/PlayerAPI_v1.0.6.pdf"
};
},created() {},methods: {
handlePreviewFile() {
this.$refs.pdfSearch.handleOpen();
},handleSafetyExperience() {
this.$router.push({ path: "/safetyApp/sharedExperience" });
}
}
};
</script>
<style scoped></style>
預覽效果
點選下載列印預覽
預覽出現亂碼
pdf列印亂碼解決辦法
開啟vue-pdf外掛目錄node_modules/vue-pdf/src/pdfjsWrapper.js
解決辦法
詳見Github上提供解決辦法 Fix fonts issue in printing #130
亂碼解決，列印預覽正常
修改後pdfjsWrapper.js原始碼
以下為本人修改的pdfjsWrapper.js檔案，親測解決亂碼問題
import { PDFLinkService } from 'pdfjs-dist/lib/web/pdf_link_service';
export default function(PDFJS) {
function isPDFDocumentLoadingTask(obj) {
return typeof(obj) === 'object' && obj !== null && obj.__PDFDocumentLoadingTask === true;
}
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');
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,canvasElt.width,canvasElt.height);
}
function clearAnnotations() {
while ( annotationLayerElt.firstChild )
annotationLayerElt.removeChild(annotationLayerElt.firstChild);
}
this.destroy = function() {
if ( pdfDoc === null )
return;
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 iframeElt = document.createElement('iframe');
var printContainerElement = document.createElement('div');
printContainerElement.setAttribute('id','print-container')
// function removeIframe() {
//
// iframeElt.parentNode.removeChild(iframeElt);
function removePrintContainer() {
printContainerElement.parentNode.removeChild(printContainerElement);
}
new Promise(function(resolve,reject) {
// iframeElt.frameBorder = '0';
// iframeElt.scrolling = 'no';
// iframeElt.width = '0px;'
// iframeElt.height = '0px;'
// iframeElt.style.cssText = 'position: absolute; top: 0; left: 0';
//
// iframeElt.onload = function() {
//
// resolve(this.contentWindow);
// }
//
// window.document.body.appendChild(iframeElt);
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(1);
// win.document.head.appendChild(win.document.createElement('style')).textContent =
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 }' +
'canvas { page-break-before: avoid; page-break-after: always; page-break-inside: avoid }' +
'#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(1);
// var printCanvasElt = win.document.body.appendChild(win.document.createElement('canvas'));
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,PRINT_UNITS,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();
}
// removeIframe();
removePrintContainer();
})
.catch(function(err) {
// removeIframe();
removePrintContainer();
emitEvent('error',err);
})
})
}
this.renderPage = function(rotate) {
if ( pdfRender !== null ) {
if ( canceling )
return;
canceling = true;
pdfRender.cancel();
return;
}
if ( pdfPage === null )
return;
if ( rotate === undefined )
rotate = pdfPage.rotate;
var scale = canvasElt.offsetWidth / pdfPage.getViewport(1).width * (window.devicePixelRatio || 1);
var viewport = pdfPage.getViewport(scale,rotate);
emitEvent('page-size',viewport.width,viewport.height);
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);
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
});
});
pdfRender
.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))
}
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;
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;
}
if ( isPDFDocumentLoadingTask(src) ) {
if ( src.destroyed ) {
emitEvent('error',new Error('loadingTask has been destroyed'));
return
}
var loadingTask = src;
} else {
var 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));
}
});
}
loadingTask
.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,}
}
補充知識：vueshowpdf外掛預覽中文pdf出現亂碼問題+pdf.js載入bcmap檔案404報錯
vue專案中使用到pdf線上預覽，使用了vueshowpdf，測試pdf是好好的，但是當上傳到伺服器出現預覽的pdf亂碼問題，很是糾結，網上找了好多資料沒有，於是找找pdf相關的pdf預覽亂碼（中文亂碼）問題解決方案。
之前也試過pdf.js外掛本地測試，當去掉cmaps資料夾之後PDF會亂碼，新增之後又好了。檢視.bcmap檔案原來時候字型有關係的，於是估計就是字型問題。
解決方法：
1、下載pdf.js外掛，複製cmaps資料夾放到vue專案中，我放在static資料夾下面
2、在對應使用到vueshowpdf外掛中新增程式碼
*** PDFJS.cMapUrl = '../../static/cmaps/'; PDFJS.cMapPacked = true; *** PDFJS.cMapUrl = '../../static/cmaps/';//這裡面是相對路徑
然後神奇的效果就是成功啦，不再亂碼了。
注意：
可能您的頁面在伺服器端還會出現亂碼，中文不識別，不要怕，我找到了問題所在，IIS的MIME問題（然後找到網上一篇文章，證實了我是的想法）
新增：2018-11-16
我們會發現
我的bcmp檔案已經放到了對應目錄了，配置也對了，怎麼還是404
其實這個是iis的MIME檔案設定
新增.bcmap檔案 配置值 .bcmap -> image/svg+xml
我遇到的問題是.net專案，所以或者在Web.config新增如下程式碼
<system.webServer> <staticContent> <mimeMap fileExtension=".bcmap" mimeType="image/svg+xml" /> </staticContent> </system.webServer>
現在重新執行下應該是可以了，如果還不行的話，暫時就不知道是什麼原因引起的了
作為一個前端，難為我了！
以上這篇解決vue-pdf檢視pdf檔案及列印亂碼的問題就是小編分享給大家的全部內容了，希望能給大家一個參考，也希望大家多多支援我們。