PDF打印:html2canvas+jspdf
需求:将前端页面转为图片,再pdf打印
解决方案:html2canvas+jspdf
安装:
npm install html2canvas --save
npm install jspdf --save
创建js文件:
import html2Canvas from 'html2Canvas'
import jsPDF from 'jspdf'
export default{
install (Vue, options) {
Vue.prototype.getPdf = function (fileName) {
var title = fileName;
html2Canvas(document.querySelector('#exportTemplate'), {
allowTaint: true
}).then(function (canvas) {
let contentWidth = canvas.width
let contentHeight = canvas.height
let pageHeight = contentWidth / 592.28 * 841.89
let leftHeight = contentHeight
let position = 0
let imgWidth = 595.28
let imgHeight = 592.28 / contentWidth * contentHeight
let pageData = canvas.toDataURL('image/jpeg', 1.0)
let PDF = new jsPDF('', 'pt', 'a4')
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
if (leftHeight > 0) {
PDF.addPage()
}
}
}
PDF.save(title + '.pdf')
}
)
}
}
}
使用:
在main.js中注册:
import printPdf from './components/common/printPdf/printPdf'
Vue.use(printPdf)
直接使用getPdf()
<bk-button @click="getPdf(fileName)">导出PDF</bk-button>
新需求补充:导出可滑动页面的所有数据
方案:
import html2Canvas from 'html2Canvas'
import jsPDF from 'jspdf'
export default{
install (Vue, options) {
Vue.prototype.getPdf = function (fileName) {
var title = fileName;
// 获取需要下载的ele
var ele = document.querySelector('#exportTemplate')
const originClientHeight = ele.clientHeight // 获取元素的原始可见高度 完成下载之后重新赋值
// 将元素的高度设为可滑动区域的滚动高度
ele.style.height = ele.scrollHeight + 'px'
html2Canvas(ele, {
allowTaint: true
}).then(function (canvas) {
ele.style.height = originClientHeight // 把元素高度重新设置为原来的高度,保证正常滑动
let contentWidth = canvas.width
let contentHeight = canvas.height
let pageHeight = contentWidth / 592.28 * 841.89
let leftHeight = contentHeight
let position = 0
let imgWidth = 595.28
let imgHeight = 592.28 / contentWidth * contentHeight
let pageData = canvas.toDataURL('image/jpeg', 1.0)
let PDF = new jsPDF('', 'pt', 'a4')
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
if (leftHeight > 0) {
PDF.addPage()
}
}
}
PDF.save(title + '.pdf')
}
)
}
}
}
下载完成后,元素高度必须设置还原,否则原来的可滑动区域将不可再滑动