vue 生成PDF(A4标准PDF分页)
vue 生成PDF(A4标准PDF分页)
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1.先安装两个插件
//页面转图片
npm install --save html2canvas
//图片转PDF
npm install jspdf --save
2. 在需要导出的dom节点增加ref='pdf' 例如
<div ref="pdf">
这是待转换的页面,点击
<button @click="handleExport">导出</button> 点击导出PDF
</div>
3.定义导出方法
handleExport() {
downloadPDF(this.$refs.pdf);
},
4.在页面导入
import { downloadPDF } from "@/utils/pdf.js";
pdf.js 内容如下
import html2canvas from "html2canvas";
import jsPDF from "jspdf";
export const downloadPDF = page => {
html2canvas(page).then(function (canvas) {
canvas2PDF(canvas);
});
};
const canvas2PDF = canvas => {
let contentWidth = canvas.width;
let contentHeight = canvas.height;
//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 imgHeight = 700/contentWidth * contentHeight;
//一页pdf显示html页面生成的canvas高度;
var pageHeight = contentWidth / 592.28 * 841.89;
let totalHeight = contentHeight;
// 第一个参数: l:横向 p:纵向
// 第二个参数:测量单位("pt","mm", "cm", "m", "in" or "px")
let pdf = new jsPDF("p", "pt");
let position = 0;
// pdf.addImage(
// canvas.toDataURL("image/jpeg", 1.0),
// "JPEG",
// 0,
// 0,
// imgWidth,
// imgHeight
// );
if (totalHeight < pageHeight) {
pdf.addImage( canvas.toDataURL("image/jpeg", 1.0), 'JPEG', 0, 0, imgWidth, imgHeight);
} else {
while (totalHeight > 0) {
pdf.addImage( canvas.toDataURL("image/jpeg", 1.0), 'JPEG', 0, position, imgWidth, imgHeight)
totalHeight -= pageHeight;
position -= 841.89;
//避免添加空白页
if (totalHeight > 0) {
pdf.addPage();
}
}
}
// pdf.addImage(
// canvas.toDataURL("image/jpeg", 1.0),
// "JPEG",
// 0,
// position,
// imgWidth,
// imgHeight
// );
pdf.save("导出.pdf");
};
5.点击导出即可成功
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