erp-el-element/utils/htmlToPdfJQ.js

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/* eslint-disable */
//使用JQuery方式写的。
import html2canvas from 'html2canvas';
import JsPDF from 'jspdf';
// import $ from 'jquery';
// console.log($, '这是什么什么');
function download(ele){
var element = $("#demo"); // 这个dom元素是要导出pdf的div容器
console.log(element,'1212122');
// var element = ele; // 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
console.log(offsetTop,'------',offsetLeft);
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)
console.log(canvas, abs, win_i, win_o);
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( (canvas)=>{ //报错
html2canvas(element[0]).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 = 592.28/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) {
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');
})
}
export default {
download
}