html,vue转换成PDF
1,先看html的,直接上代码
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> <style> #demo{ background-color: yellow; width: 1000px; height: 2000px; /* margin: auto; */ } .red{ background-color: red; width: 50px; height: 50px; } </style> </head> <body> <div class="demo-container"> <div id="demo"> <div class="red"></div> </div> </div> <button> 下载简历 </button> </body> <script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/jspdf/1.0.272/jspdf.debug.js"></script> <script src="https://cdn.bootcss.com/html2canvas/0.5.0-beta4/html2canvas.js"></script> <script> function download(){ window.scrollTo(0,0); //解决有滚动条的情况图片或者pdf展示不完全 var element = $("#demo"); // 这个dom元素是要导出pdf的div容器 var w = element.width(); // 获得该容器的宽 var h = element.height(); // 获得该容器的高 var offsetTop = element.offset().top; // 获得该容器到文档顶部的距离 var offsetLeft = element.offset().left; // 获得该容器到文档最左的距离 var canvas = document.createElement("canvas"); var abs = 0; var win_i = $(window).width(); // 获得当前可视窗口的宽度(不包含滚动条) var win_o = window.innerWidth; // 获得当前窗口的宽度(包含滚动条) if(win_o>win_i){ abs = (win_o - win_i)/2; // 获得滚动条长度的一半 } canvas.width = w * 2; // 将画布宽&&高放大两倍 canvas.height = h * 2; var context = canvas.getContext("2d"); context.scale(2, 2); context.translate(-offsetLeft-abs,-offsetTop); // 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 // translate的时候,要把这个差值去掉 html2canvas(element).then(function(canvas) { var contentWidth = canvas.width; var contentHeight = canvas.height; //一页pdf显示html页面生成的canvas高度; var pageHeight = contentWidth / 592.28 * 841.89; //未生成pdf的html页面高度 var leftHeight = contentHeight; //页面偏移 var position = 0; //a4纸的尺寸[595.28,841.89],html页面生成的canvas在pdf中图片的宽高 var imgWidth = 595.28; var imgHeight = 592.28/contentWidth * contentHeight; var pageData = canvas.toDataURL('image/jpeg', 1.0); console.log(pageData); var pdf = new jsPDF('', 'pt', 'a4'); //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) //当内容未超过pdf一页显示的范围,无需分页 if (leftHeight < pageHeight) { pdf.addImage(pageData, 'JPEG', 0, 0, imgWidth, imgHeight); } else { // 分页 while(leftHeight > 0) { pdf.addImage(pageData, 'JPEG', 0, position, imgWidth, imgHeight) leftHeight -= pageHeight; position -= 841.89; //避免添加空白页 if(leftHeight > 0) { pdf.addPage(); } } } pdf.save('我的简历.pdf'); }) } $("button").click(function(){ download(); }) </script> </html>
2,vue项目中使用
①先安装依赖
第一个.将页面html转换成图片 npm install --save html2canvas 第二个.将图片生成pdf npm install jspdf --save
②定义工具文件
/* eslint-disable */ //不使用JQuery版的 import html2canvas from 'html2canvas'; import JsPDF from 'jspdf'; /** * @param ele 要生成 pdf 的DOM元素(容器) * @param padfName PDF文件生成后的文件名字 * */ function downloadPDF(ele, pdfName) { window.scrollTo(0, 0); let eleW = ele.offsetWidth;// 获得该容器的宽 let eleH = ele.offsetHeight;// 获得该容器的高 let eleOffsetTop = ele.offsetTop; // 获得该容器到文档顶部的距离 let eleOffsetLeft = ele.offsetLeft; // 获得该容器到文档最左的距离 var canvas = document.createElement("canvas"); var abs = 0; 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) let win_out = window.innerWidth; // 获得当前窗口的宽度(包含滚动条) if (win_out > win_in) { // abs = (win_o - win_i)/2; // 获得滚动条长度的一半 abs = (win_out - win_in) / 2; // 获得滚动条宽度的一半 // console.log(a, '新abs'); } canvas.width = eleW * 2; // 将画布宽&&高放大两倍 canvas.height = eleH * 2; var context = canvas.getContext("2d"); context.scale(2, 2); context.translate(-eleOffsetLeft - abs, -eleOffsetTop); // 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 // translate的时候,要把这个差值去掉 // html2canvas(element).then( (canvas)=>{ //报错 // html2canvas(element[0]).then( (canvas)=>{ html2canvas(ele, { dpi: 300, // 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 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。 }).then((canvas) => { var contentWidth = canvas.width; var contentHeight = canvas.height; //一页pdf显示html页面生成的canvas高度; var pageHeight = contentWidth / 592.28 * 841.89; //未生成pdf的html页面高度 var leftHeight = contentHeight; //页面偏移 var position = 0; //a4纸的尺寸[595.28,841.89],html页面生成的canvas在pdf中图片的宽高 var imgWidth = 595.28; var imgHeight = 595.28 / contentWidth * contentHeight; var pageData = canvas.toDataURL('image/jpeg', 1.0); var pdf = new JsPDF('', 'pt', 'a4'); //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) //当内容未超过pdf一页显示的范围,无需分页 if (leftHeight < pageHeight) { //在pdf.addImage(pageData, 'JPEG', 左,上,宽度,高度)设置在pdf中显示; pdf.addImage(pageData, 'JPEG', 0, 0, imgWidth, imgHeight); // pdf.addImage(pageData, 'JPEG', 20, 40, imgWidth, imgHeight); } else { // 分页 while (leftHeight > 0) { pdf.addImage(pageData, 'JPEG', 0, position, imgWidth, imgHeight); leftHeight -= pageHeight; position -= 841.89; //避免添加空白页 if (leftHeight > 0) { pdf.addPage(); } } } //可动态生成 pdf.save(pdfName); }) } async function previewImg(ele) { // 返回图片base64格式 window.scrollTo(0, 0); let eleW = ele.offsetWidth;// 获得该容器的宽 let eleH = ele.offsetHeight;// 获得该容器的高 let eleOffsetTop = ele.offsetTop; // 获得该容器到文档顶部的距离 let eleOffsetLeft = ele.offsetLeft; // 获得该容器到文档最左的距离 var canvas = document.createElement("canvas"); var abs = 0; 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) let win_out = window.innerWidth; // 获得当前窗口的宽度(包含滚动条) if (win_out > win_in) { abs = (win_out - win_in) / 2; // 获得滚动条宽度的一半 } canvas.width = eleW * 2; canvas.height = eleH * 2; var context = canvas.getContext("2d"); context.scale(2, 2); context.translate(-eleOffsetLeft - abs, -eleOffsetTop); var baseSrc = '' await html2canvas(ele, { //等待函数执行完成 dpi: 300, 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。 }).then((canvas) => { var pageData = canvas.toDataURL('image/jpeg', 1.0); baseSrc = pageData }) return baseSrc; } export default { downloadPDF, previewImg }
③在项目中使用
<div style="padding: 10px;"> <el-button type="primary" @click="handlePreview()">预览</el-button> <el-button type="primary" @click="handleDown()">下载</el-button> </div>
import htmlToPdf from '@/assets/js/toPdf'
export default {
methods: {
handleDown () {
htmlToPdf.downloadPDF(document.querySelector('#demo'), '离职申请表')
},
handlePreview () {
htmlToPdf.previewImg(document.querySelector('#demo')).then( res => {
this.previewUrl = res
})
}
}
}