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import html2canvas from 'html2canvas'; |
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import JsPDF from 'jspdf'; |
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/** |
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* @param ele 要生成 pdf 的DOM元素(容器) |
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* @param padfName PDF文件生成后的文件名字 |
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* */ |
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function downloadPDF(ele, pdfName){ |
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let eleW = ele.offsetWidth;// 获得该容器的宽
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let eleH = ele.offsetHeight;// 获得该容器的高
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let eleOffsetTop = ele.offsetTop; // 获得该容器到文档顶部的距离
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let eleOffsetLeft = ele.offsetLeft; // 获得该容器到文档最左的距离
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var canvas = document.createElement("canvas"); |
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var abs = 0; |
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let win_in = document.documentElement.clientWidth || document.body.clientWidth; // 获得当前可视窗口的宽度(不包含滚动条)
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let win_out = window.innerWidth; // 获得当前窗口的宽度(包含滚动条)
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if(win_out>win_in){ |
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// abs = (win_o - win_i)/2; // 获得滚动条长度的一半
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abs = (win_out - win_in)/2; // 获得滚动条宽度的一半
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// console.log(a, '新abs');
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} |
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canvas.width = eleW * 2; // 将画布宽&&高放大两倍
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canvas.height = eleH * 2; |
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var context = canvas.getContext("2d"); |
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context.scale(2, 2); |
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context.translate(-eleOffsetLeft -abs, -eleOffsetTop); |
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// 这里默认横向没有滚动条的情况,因为offset.left(),有无滚动条的时候存在差值,因此
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// translate的时候,要把这个差值去掉
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// html2canvas(element).then( (canvas)=>{ //报错
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// html2canvas(element[0]).then( (canvas)=>{
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html2canvas( ele, { |
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dpi: 300, |
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// allowTaint: true, //允许 canvas 污染, allowTaint参数要去掉,否则是无法通过toDataURL导出canvas数据的
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useCORS:true //允许canvas画布内 可以跨域请求外部链接图片, 允许跨域请求。
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} ).then( (canvas)=>{ |
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var contentWidth = canvas.width; |
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var contentHeight = canvas.height; |
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//一页pdf显示html页面生成的canvas高度;
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var pageHeight = contentWidth / 592.28 * 841.89; |
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//未生成pdf的html页面高度
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var leftHeight = contentHeight; |
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//页面偏移
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var position = 0; |
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//a4纸的尺寸[595.28,841.89],html页面生成的canvas在pdf中图片的宽高
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var imgWidth = 595.28; |
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var imgHeight = 595.28/contentWidth * contentHeight; |
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var pageData = canvas.toDataURL('image/jpeg', 1.0); |
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var pdf = new JsPDF('', 'pt', 'a4'); |
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//有两个高度需要区分,一个是html页面的实际高度,和生成pdf的页面高度(841.89)
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//当内容未超过pdf一页显示的范围,无需分页
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if (leftHeight < pageHeight) { |
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//在pdf.addImage(pageData, 'JPEG', 左,上,宽度,高度)设置在pdf中显示;
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pdf.addImage(pageData, 'JPEG', 0, 0, imgWidth, imgHeight); |
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// pdf.addImage(pageData, 'JPEG', 20, 40, imgWidth, imgHeight);
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} else { // 分页
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while(leftHeight > 0) { |
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pdf.addImage(pageData, 'JPEG', 0, position, imgWidth, imgHeight); |
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leftHeight -= pageHeight; |
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position -= 841.89; |
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//避免添加空白页
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if(leftHeight > 0) { |
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pdf.addPage(); |
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} |
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} |
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} |
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//可动态生成
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pdf.save(pdfName); |
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}) |
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} |
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export default { |
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downloadPDF |
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} |
@ -1,28 +0,0 @@ |
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<!--<template>--> |
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<!-- <div class="pdf-demo">--> |
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<!-- <button @click="handleDown">jsPDF方式下载</button>--> |
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<!-- <!– <button @click="handleWindowPrint( '#demo', '电子合同' )">浏览器方式下载</button>–>--> |
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<!-- <div id="demo">--> |
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<!-- #demo 中的内容导出成 PDF--> |
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<!-- </div>--> |
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<!-- </div>--> |
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<!--</template>--> |
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<!--<script>--> |
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<!--import htmlToPdf from 'yourPath /htmlToPdf';--> |
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<!--export default {--> |
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<!-- methods: {--> |
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<!-- handleDown() {--> |
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<!-- //导出PDF--> |
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<!-- htmlToPdf.downloadPDF(document.querySelector('#demo'), '我的PDF');--> |
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<!-- },--> |
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<!-- }--> |
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<!--}--> |
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<!--</script>--> |
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