import html2Canvas from 'html2canvas'
import JsPDF from 'jspdf'
export default {
install(Vue, options) {
/**
*
* @param {*} reportName 下载时候的标题
* @param {*} isDownload 是否下载默认为下载,传false不下载
*/
Vue.prototype.getPdf = function (reportName, isDownload = true) {
// var target = document.getElementsByClassName("right-aside")[0];
// target.style.background = "#FFFFFF";
return new Promise((resolve, reject) => {
var title = reportName;
html2Canvas(document.querySelector('#pdfDom'), {
allowTaint: true
}).then((canvas) => {
let contentWidth = canvas.width
let contentHeight = canvas.height
//一页pdf显示html页面生成的canvas高度;
let pageHeight = contentWidth / 592.28 * 841.89
//未生成pdf的html页面高度
let leftHeight = contentHeight
//页面偏移
let 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
let imgWidth = 595.28
let imgHeight = 592.28 / contentWidth * contentHeight
let pageData = canvas.toDataURL('image/jpeg', 1.0)
let 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 {
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()
}
}
}
if (isDownload) {
PDF.save(title + '.pdf')
}
// 删除本地存储的base64字段
var pdfData = PDF.output('datauristring')//获取base64Pdf
resolve(pdfData)
}
)
})
}
}
}
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