html,vue转换成PDF

vue

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
})
}

  }

}

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