|
|
|
import html2canvas from 'html2canvas'
|
|
|
|
/*import jsPDF from 'jspdf'*/
|
|
|
|
export default{
|
|
|
|
install (Vue, options) {
|
|
|
|
Vue.prototype.getPdf = function (htmlTitle,currentTime) {
|
|
|
|
var element = document.getElementById("file");
|
|
|
|
html2canvas(element, {
|
|
|
|
logging:false
|
|
|
|
}).then(function(canvas) {
|
|
|
|
var pdf = new jsPDF('p', 'mm', 'a4'); //A4纸，纵向
|
|
|
|
var ctx = canvas.getContext('2d'),
|
|
|
|
a4w = 190, a4h = 277, //A4大小，210mm x 297mm，四边各保留10mm的边距，显示区域190x277
|
|
|
|
imgHeight = Math.floor(a4h * canvas.width / a4w), //按A4显示比例换算一页图像的像素高度
|
|
|
|
renderedHeight = 0;
|
|
|
|
|
|
|
|
while(renderedHeight < canvas.height) {
|
|
|
|
var page = document.createElement("canvas");
|
|
|
|
page.width = canvas.width;
|
|
|
|
page.height = Math.min(imgHeight, canvas.height - renderedHeight);//可能内容不足一页
|
|
|
|
|
|
|
|
//用getImageData剪裁指定区域，并画到前面创建的canvas对象中
|
|
|
|
page.getContext('2d').putImageData(ctx.getImageData(0, renderedHeight, canvas.width, Math.min(imgHeight, canvas.height - renderedHeight)), 0, 0);
|
|
|
|
pdf.addImage(page.toDataURL('image/jpeg', 1.0), 'JPEG', 10, 10, a4w, Math.min(a4h, a4w * page.height / page.width)); //添加图像到页面，保留10mm边距
|
|
|
|
|
|
|
|
renderedHeight += imgHeight;
|
|
|
|
if(renderedHeight < canvas.height)
|
|
|
|
pdf.addPage();//如果后面还有内容，添加一个空页
|
|
|
|
}
|
|
|
|
//不使用JQuery版的
|
|
|
|
|
|
|
|
pdf.save(htmlTitle);
|
|
|
|
});
|
|
|
|
}
|
|
|
|
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){
|
|
|
|
|
|
|
|
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);
|
|
|
|
})
|
|
|
|
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
export default {
|
|
|
|
downloadPDF
|
|
|
|
} |
...
|
...
|
|
