vue3笔记（37）页面转 pdf 导出

新需求，报价管理中每个报价单的明细需要转换成 pdf 导出，调研后完美实现。

安装包

npm i html2canvas
npm i jspdf

html 转 pdf

在utils文件夹下新建html2pdf.ts文件

import html2canvas from 'html2canvas';
import jsPDF from 'jspdf'

export const htmlToPDF = async (htmlId: string, title: string = "报表", bgColor = "#fff") => {
    let pdfDom: HTMLElement | null = document.getElementById(htmlId) as HTMLElement
    pdfDom.style.padding = '0 10px !important'
    const A4Width = 595.28;
    const A4Height = 841.89;
    let canvas = await html2canvas(pdfDom, {
        scale: 2,
        useCORS: true,
        backgroundColor: bgColor,
    });
    let pageHeight = (canvas.width / A4Width) * A4Height;
    let leftHeight = canvas.height;
    let position = 0;
    let imgWidth = A4Width;
    let imgHeight = (A4Width / canvas.width) * canvas.height;
    /*
     自定义水印代码
    */
   const ctx: any = canvas.getContext('2d');
    ctx.textAlign = 'center';
    ctx.textBaseline = 'middle';
    ctx.rotate((20 * Math.PI) / 180);
    ctx.font = '20px Microsoft Yahei';
    ctx.fillStyle = 'rgba(184, 184, 184, 0.8)';
    for (let i = canvas.width * -1; i < canvas.width; i += 240) {
        for (let j = canvas.height * -1; j < canvas.height; j += 200) {
            // 填充文字，x 间距, y 间距
            ctx.fillText('水印名', i, j);
        }
    }
    /*
     自定义水印代码
    */
    let pageData = canvas.toDataURL("image/jpeg", 1.0);
    let PDF = new jsPDF("p", '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 -= A4Height;
            if (leftHeight > 0) PDF.addPage();
        }
    }
    PDF.save(title + ".pdf");
}

项目中使用

<template>
  <div class="quote" id="test-id">
    <!-- 这里是导出内容 -->
  </div>
  <el-button type="text" @click="handleExport">导出</el-button>
</template>

<script lang="ts" setup>
import { htmlToPDF } from '@/utils/html2pdf'
const handleExport = () => {
  htmlToPDF('test-id', state.quote.quotation_number)
}
</script>

点击按钮触发导出功能，最终效果如下：