如何在Node.js中使用html创建pdf

如何解决如何在Node.js中使用html创建pdf

我正在尝试将html转换为pdf，我想在其中传递一些动态值，此后，当我使用此代码并创建了外部html文件时，我想生成一个pdf。转换pdf，这是该代码

invoice.html

<!DOCTYPE html>
<html lang="en">
<head>
<Meta charset="UTF-8" />
<Meta name="viewport" content="width=device-width,initial-scale=1.0" />
<title>Document</title>
</head>
<body>
<h2>Approve Page,</h2>
</body>
</html>

这是pdf.js文件

const fs = require("fs");
const path = require("path");
const utils = require("util");
const puppeteer = require("puppeteer");
const hb = require("handlebars");
const readFile = utils.promisify(fs.readFile);

async function getTemplateHtml() {
  console.log("Loading template file in memory");
  try {
    const invoicePath = path.resolve("./invoice.html");
    return await readFile(invoicePath,"utf8");
  } catch (err) {
    console.log(err);
  }
}

async function generatePdf() {
  let data = {};

  getTemplateHtml()
    .then(async (res) => {
      console.log("Compiing the template with handlebars");
      const template = hb.compile(res,{ strict: true });

      const result = template(data);

      const html = result;

      const browser = await puppeteer.launch();
      const page = await browser.newPage();

      await page.setContent(html);

      await page.pdf({ path: "invoice.pdf",format: "A4" });

      await browser.close();
      console.log("PDF Generated");
      return;
    })
    .catch((err) => {
      console.error(err);
    });
}

generatePdf();

但是我想以这种方式实现

const fs = require("fs");
const path = require("path");
const utils = require("util");
const puppeteer = require("puppeteer");
const hb = require("handlebars");
const readFile = utils.promisify(fs.readFile);
const A = "invoice";
const html = `<!DOCTYPE html>
<html lang="en">
<head>
<Meta charset="UTF-8" />
<Meta name="viewport" content="width=device-width,${A}</h2>
</body>
</html>
`;

async function getTemplateHtml() {
  console.log("Loading template file in memory");
  try {
    return await readFile(html,"text/html utf8");
  } catch (err) {
    console.log(err);
  }
}

async function generatePdf() {
  let data = {};

  getTemplateHtml()
    .then(async (res) => {
      console.log("Compiing the template with handlebars");
      const template = hb.compile(res,format: "A4" });

      await browser.close();
      console.log("PDF Generated");
      return;
    })
    .catch((err) => {
      console.error(err);
    });
}

generatePdf();

但收到此错误

消息： '您必须将字符串或Handlebars AST传递给Handlebars.compile。您通过了未定义”，名称：“错误”，

解决方法

我能够用很少的代码解决此问题，但想问一问是否有可能将其转换为base64而不是创建pdf文件。这是解决方案

const fs = require("fs");
const path = require("path");
const utils = require("util");
const puppeteer = require("puppeteer");
const hb = require("handlebars");
const readFile = utils.promisify(fs.readFile);
(async () => {
const A = "invoice";
const htmlContent = `<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width,initial-scale=1.0" />
<title>Document</title>
</head>
<body>
<h2>Approve Page,${A}</h2>
</body>
</html>
`;
  const browser = await puppeteer.launch();
  const page = await browser.newPage();
  await page.setContent(htmlContent);
  await page.pdf({ path: "html.pdf",format: "A4" });

  await browser.close();
})();