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<template>
<div class="wrapper">
<template v-for="page in pages">
<canvas :id="ID_Prefix + page" :key="page"></canvas>
</template>
</div>
</template>
<script>
const pdfViewerPath = '/static/plugins/pdfviewer/'
const ID_Prefix = 'pdfviewer-canvas'
export default {
props:{
url: [String, Object, ArrayBuffer]
},
data(){
return {
pages: 1,
ID_Prefix: ID_Prefix
}
},
created(){
if(!window.pdfjsLib){
var hm = document.createElement("script");
hm.src = pdfViewerPath + "js/pdf.js";
hm.onload = () => {
this.redenrPdf()
}
hm.onerror = function(err){
alert('pdfjs加载出错')
}
var s = document.getElementsByTagName("script")[0];
s.parentNode.insertBefore(hm, s);
}else this.redenrPdf()
},
methods:{
// 多页数组
getDataURLs(){
let arr = []
for(let i =1;i<= this.pages; i++){
let el = document.getElementById(ID_Prefix + i)
el.getContext('2d')
arr.push(el.toDataURL('image/png'))
}
return arr;
},
redenrPdf(){
//
// The workerSrc property shall be specified.
//
let pdfjsLib = window.pdfjsLib
pdfjsLib.GlobalWorkerOptions.workerSrc = pdfViewerPath + 'js/pdf.worker.js';
/* pdfjsLib.GlobalWorkerOptions.useWorkerFetch = true
pdfjsLib.GlobalWorkerOptions.cMapUrl = pdfViewerPath + 'cmaps/' */
//
// Asynchronous download PDF
//
const loadingTask = pdfjsLib.getDocument({
data: this.url,
useWorkerFetch: true,
cMapUrl: pdfViewerPath + 'cmaps/'
});
(async () => {
const pdf = await loadingTask.promise;
window.pdf2 = pdf
this.pages = pdf.numPages
this.$nextTick(async () => {
for(let i=1; i <= this.pages; i++){
let page = await pdf.getPage(i);
let scale = 1.5;
let viewport = page.getViewport({ scale });
// Support HiDPI-screens.
let outputScale = window.devicePixelRatio || 1;
//
// Prepare canvas using PDF page dimensions
//
const canvas = document.getElementById(ID_Prefix + i);
const context = canvas.getContext("2d");
canvas.width = Math.floor(viewport.width * outputScale);
canvas.height = Math.floor(viewport.height * outputScale);
canvas.style.width = Math.floor(viewport.width) + "px";
canvas.style.height = Math.floor(viewport.height) + "px";
const transform = outputScale !== 1
? [outputScale, 0, 0, outputScale, 0, 0]
: null;
//
// Render PDF page into canvas context
//
const renderContext = {
canvasContext: context,
transform,
viewport,
};
page.render(renderContext);
}
})
})();
}
}
}
</script>
<style scoped lang="scss">
.wrapper{
text-align: center;
canvas{
display: block;
border: 1px solid #333;
margin: 5px auto;
}
}
</style>