AngularUniversalSSR在访问api时出现错误“ErrorEvent未定义”
创始人
2024-10-29 21:01:15
0

这个错误通常是由于Node.js环境中缺少对客户端事件API(例如window和document)的支持而引起的。 在Angular应用程序中使用的大多数常规事件(如click和mouseover)在服务器上不起作用,因此需要手动创建它们的替代品。

以下是解决此问题的代码示例:

在app.server.module.ts中导入以下代码:

import 'zone.js/dist/zone-node';
import { ngExpressEngine } from '@nguniversal/express-engine';
import * as express from 'express';
import { join } from 'path';

import { AppServerModule } from './app/app.server.module';
import { APP_BASE_HREF } from '@angular/common';
import { provideModuleMap } from '@nguniversal/module-map-ngfactory-loader';

export function createApiRequestOptions(req: express.Request) {
  return {
    headers: {
      Cookie: req.header('Cookie')
    }
  };
}

export function serverFactory(): express.Express {
  const server = express();
  const distFolder = join(process.cwd(), 'dist/browser');
  const indexHtml = existsSync(join(distFolder, 'index.html')) ? 'index.html' : 'index';

  const { AppServerModuleNgFactory, LAZY_MODULE_MAP } = require('./dist/server/main');

  server.engine('html', ngExpressEngine({
    bootstrap: AppServerModuleNgFactory,
    providers: [
      provideModuleMap(LAZY_MODULE_MAP),
      { provide: APP_BASE_HREF, useValue: '/' },
      { provide: 'REQUEST', useFactory: (req: any) => ({ ...req, apiRequestOptions: createApiRequestOptions(req) }), deps: [express.Request] },
    ]
  }));

  server.set('view engine', 'html');
  server.set('views', distFolder);

  server.get('/api/*', (req, res) => {
    const http = require('http');
    const url = require('url');
    const options = createApiRequestOptions(req);
    const apiReq = http.request(url.parse(`http://localhost:3000${req.originalUrl}`), options, (apiRes: any) => {
      const headers = apiRes.headers;

      res.writeHead(apiRes.statusCode, { ...headers });
      apiRes.pipe(res);
      apiRes.on('close', () => {
        res.end();
      });
    });

    apiReq.on('error', (e: ErrorEvent) => {
      console.error(e);
    });

    apiReq.end();
  });

  server.get('*.*', express.static(distFolder, {
    maxAge: '1y'
  }));

  server.get('*', (req, res) => {
    res.render(indexHtml, {
      req,
      providers: [
        { provide: 'REQUEST', useValue: req },
      ]
    });
  });

  return server;
}

export const appUrl = 'http://localhost:4000';

在server.ts文件中,将以下代码放在创建服务器的代码之前:

global['Event'] = null;
global['window'] = { location: { href: null }, Evergreen: { isDocumentReplaced: true }};
global['document'] = { cookie: '', createElement: () => ({}) };
global['navigator'] = {};
global['requestAnimationFrame'] = (callback) => setTimeout(callback, 0, Date.now());
global['XMLHttpRequest'] = require('xmlhttprequest').XMLHttpRequest;

这会在Node.js环境中创建所需的全局变量。请注意,这些变量的实际值不重要,只要

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