<template>
<div>
<a-modal v-model="dialogVisible" title="Basic Modal" >
<iframe id="iframe123" :src="iframeSrc" frameborder="0" width="500" height="300"></iframe>
</a-modal>
</div>
</template>
<script>
import html2canvas from 'html2canvas';
import newJsPDF from 'jspdf'
export default {
data() {
return {
dialogVisible:false,
iframeSrc:'',
};
},
methods: {
getPdfFromHtml(ele, pdfFileName) {
console.log(1111,ele);
ele.style.fontFamily='宋体';
ele.style.padding='0 20px';
let scale = window.devicePixelRatio * 2
html2canvas(ele,{
dpi: 300,
scale:scale,
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。
allowTaint: false,
height: ele.offsetHeight,
width: ele.offsetWidth,
windowWidth: document.body.scrollWidth,
windowHeight: document.body.scrollHeight,
}).then(canvas=>{
this.dialogVisible = true;
const _this = this;
//未生成pdf的html页面高度
var leftHeight = canvas.height;
var a4Width = 595.28
var a4Height = 841.89
//一页pdf显示html页面生成的canvas高度;
var a4HeightRef = Math.floor(canvas.width / a4Width * a4Height);
//pdf页面偏移
var position = 0;
var pageData = canvas.toDataURL('image/jpeg', 1.0);
var pdf = new newJsPDF('x', 'pt', 'a4');
var index = 1,
canvas1 = document.createElement('canvas'),
height;
pdf.setDisplayMode('fullwidth', 'continuous', 'FullScreen');
// $('.head-content').append($(
// '<div class="pdfTip">' +
// ' <div>正在生成第<span class="pdfProgress">1</span>页，共<span class="pdfTotal"></span>页...' +
// '</div>'));
function createImpl(canvas) {
if (leftHeight > 0) {
index++;
var checkCount = 0;
if (leftHeight > a4HeightRef) {
var i = position + a4HeightRef;
for (i = position + a4HeightRef; i >= position; i--) {
var isWrite = true
for (var j = 0; j < canvas.width; j++) {
var c = canvas.getContext('2d').getImageData(j, i, 1, 1).data
if (c[0] != 0xff || c[1] != 0xff || c[2] != 0xff) {
isWrite = false
break
}
}
if (isWrite) {
checkCount++
if (checkCount >= 10) {
break
}
} else {
checkCount = 0
}
}
height = Math.round(i - position) || Math.min(leftHeight, a4HeightRef);
if(height<=0){
height = a4HeightRef;
}
} else {
height = leftHeight;
}
canvas1.width = canvas.width;
canvas1.height = height;
// console.log(index, 'height:', height, 'pos', position);
var ctx = canvas1.getContext('2d');
ctx.drawImage(canvas, 0, position, canvas.width, height, 0, 0, canvas.width, height);
var pageHeight = Math.round(a4Width / canvas.width * height);
// pdf.setPageSize(null, pageHeight)
if(position != 0){
pdf.addPage();
}
pdf.addImage(canvas1.toDataURL('image/jpeg', 1.0), 'JPEG', 0, 0, a4Width, a4Width / canvas1.width * height);
leftHeight -= height;
position += height;
// $('.pdfProgress').text(index + 1);
// $('.pdfTotal').text(index + Math.ceil(leftHeight / a4HeightRef));
if (leftHeight > 0) {
//添加全屏水印
const base64 = 'data:image/png;base64,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'
for(let i=0;i<6;i++){
for(let j=0;j<5;j++){
const left = (j*120)+20;
pdf.addImage(base64,'JPEG', left, i*150, 20, 30);
}
}
setTimeout(createImpl, 500, canvas);
} else {
// _this.iframeSrc = pdf.output('dataurlstring');
// debugger;
pdf.save(pdfFileName + '.pdf');
// $('.pdfTip').remove();
}
}
}
//当内容未超过pdf一页显示的范围，无需分页
if (leftHeight < a4HeightRef) {
pdf.addImage(pageData, 'JPEG', 0, 0, a4Width, a4Width / canvas.width * leftHeight);
this.dialogVisible = true;
// this.iframeSrc = pdf.output('dataurlstring');
// debugger;
pdf.save(pdfFileName + '.pdf')
} else {
try {
pdf.deletePage(0);
// $('.pdfTip').show();
// $('.pdfTotal').text(index + Math.ceil(leftHeight / a4HeightRef));
setTimeout(createImpl, 500, canvas);
} catch (err) {
console.log(err);
}
}
})
},
getPdfFromHtml2(ele, pdfFileName) {
let eleW = ele.offsetWidth// 获得该容器的宽
// let eleH = ele.offsetHeight // 获得该容器的高
let eleH = ele.scrollHeight// 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
}
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) // 增强图片清晰度
context.translate(-eleOffsetLeft - abs, -eleOffsetTop)
html2canvas(ele, {
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。
allowTaint: false,
height: ele.offsetHeight,
width: ele.offsetWidth,
windowWidth: document.body.scrollWidth,
windowHeight: document.body.scrollHeight,
}).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 // 这样写的目的在于保持宽高比例一致 pageHeight/canvas.width = a4纸高度/a4纸宽度// 宽度和canvas.width保持一致
//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],单位像素，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 = newJsPDF("", "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", 5, 0, imgWidth, imgHeight)
// pdf.addImage(pageData, 'JPEG', 20, 40, imgWidth, imgHeight);
} else {
// 分页
while (leftHeight > 0) {
pdf.addImage(pageData, "JPEG", 5, position, imgWidth, imgHeight)
leftHeight -= pageHeight
position -= 841.89
const base64 = 'data:image/png;base64,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'
for(let i=0;i<6;i++){
for(let j=0;j<5;j++){
const left = (j*120)+20;
console.log(555,left);
pdf.addImage(base64,'JPEG', left, i*150, 20, 30);
}
}
//避免添加空白页
if (leftHeight > 0) {
pdf.addPage()
}
}
}
// pdf.save();
this.dialogVisible = true;
// const a = pdf.output();
// debugger;
pdf.save(pdfFileName + ".pdf")
this.$nextTick(()=>{
// const _iframeSrc = pdf.output('datauristring');
// window.open(pdf.output('datauristring'));
// this.iframeSrc = pdf.output('dataurlstring');
// this.iframeSrc = pdf.output('datauristring');
// debugger;
// this.showPdf(_iframeSrc);
// console.log(555555,this.iframeSrc)
// document.getElementById("iframe123").src = pdf.output('datauristring');
})
})
},
}
}
</script>
<style scoped lang="scss">
</style>
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