Angular 通用仅适用于特定模块

Question

我有一个 Angular Web 应用程序（客户端 - Angular 9，服务器 - Java）， 现在我想使用Angular universal添加要在服务器上呈现的新组件（例如Express-engine）。

我的目标是继续在浏览器中正常运行所有应用程序，并且只有新组件的特定模块才会在服务器上呈现。 网站应该像往常一样加载，当路由到应用程序的特定部分时，它将从服务器加载预渲染模块。

是否可以在服务器上只渲染部分网页？

谢谢！

编辑： 正如@izmaylovdev 建议的那样， 我尝试使用以下get 编辑server.ts：

// All regular routes use the Universal engine
server.get('*', (req, res) => {     
  res.sendFile(distFolder + '\\' + indexHtml);   
}); 
// Specific route
server.get(matcherForSpecificRoutes, (req, res) => {     
  res.render(indexHtml, { req, providers: [{ provide: APP_BASE_HREF, useValue: req.baseUrl }] });   
});

但是我怎样才能看到不同的行为呢？我只能在服务到不同的 URL 时看到不同的日志。

Answer 1

SSR 允许您为应用程序的任何路由从服务器返回渲染页面。但是在加载 JS 脚本后，您的应用程序照常工作（使用客户端渲染）。如果您不想对特定路由使用 SSR，您可以在服务器设置 Angular Universal 中为这些路由设置返回 index.html（来自 dist 文件夹）的服务器（或代理），并将 SSR 用于其他路由它只是一个模板引擎。

对于您的情况，您可以像这样配置 Express：

export function app() {
  const server = express();
  const distFolder = join(process.cwd(), 'path to dist folder');
  const indexHtml = existsSync(join(distFolder, 'index.original.html')) ? 'index.original.html' : 'index';


  // Our Universal express-engine (found @ https://github.com/angular/universal/tree/master/modules/express-engine)
  server.engine('html', ngExpressEngine({
    bootstrap: AppServerModule,
  }));

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

  // Example Express Rest API endpoints
  // app.get('/api/**', (req, res) => { });
  // Serve static files from /browser
  server.get('**/*.*', express.static(distFolder, {
    maxAge: '1y'
  }));
      
  server.get('*', (reg, res) => { res.send(indexHtml) });

  server.get(matcherForSpecificRoutes, (req, res) => {
    global['navigator'] = req['headers']['user-agent'];
    const http = req.headers['x-forwarded-proto'] === undefined ? 'http' : req.headers['x-forwarded-proto'];

    const url = req.originalUrl;
    // tslint:disable-next-line:no-console
    console.time(`GET: ${url}`);

    res.render(indexHtml, {
      req,
      providers: [
        { provide: APP_BASE_HREF, useValue: req.baseUrl },
        {
          provide: REQUEST,
          useValue: req
        },
        {
          provide: RESPONSE,
          useValue: res     
        },
        {
          provide: 'ORIGIN_URL',
          useValue: (`${http}://${req.headers.host}`)
        }
      ]
    });
  });

  return server;
}

Answer 2

对于非 ssr 路由，您可以轻松地这样做。只需对 server.ts 文件进行更改，如下所示。

  // non ssr routes like dashboard or auth pages
  server.get('/dashboard/**', (req, res) => {
    console.log('not rendering auth page');
    res.sendFile(distFolder + '/index.html');
  });

  // All regular routes use the Universal engine
  server.get('*', (req, res) => {
    res.render(indexHtml, { req, providers: [{ provide: APP_BASE_HREF, useValue: req.baseUrl }] });
  });

server.ts

(global as any).WebSocket = require('ws');
(global as any).XMLHttpRequest = require('xhr2');
import 'zone.js/dist/zone-node';

const domino = require('domino');
const fs = require('fs');
const path = require('path');


import { ngExpressEngine } from '@nguniversal/express-engine';
import * as express from 'express';
import { join } from 'path';
import { existsSync } from 'fs';

const distFolder = join(process.cwd(), 'dist/localmasters/browser');
const template = fs.readFileSync(path.join(distFolder, 'index.html')).toString();
const win = domino.createWindow(template.toString());
global['window'] = win;
global['document'] = win.document;
global['DOMTokenList'] = win.DOMTokenList;
global['Node'] = win.Node;
global['Text'] = win.Text;
global['HTMLElement'] = win.HTMLElement;
global['navigator'] = win.navigator;
global['getComputedStyle'] = win.getComputedStyle;

(global as any).self = {fetch: require('node-fetch')};



import { AppServerModule } from './src/main.server';
import { APP_BASE_HREF } from '@angular/common';
import { environment } from './src/environments/environment';

// The Express app is exported so that it can be used by serverless Functions.
export function app(): express.Express {
  const server = express();
  const distFolder = join(process.cwd(), 'dist/localmasters/browser');
  const indexHtml = existsSync(join(distFolder, 'index.original.html')) ? 'index.original.html' : 'index';

  // Our Universal express-engine (found @ https://github.com/angular/universal/tree/master/modules/express-engine)
  server.engine('html', ngExpressEngine({
    bootstrap: AppServerModule,
  }));

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

  // Example Express Rest API endpoints
  // server.get('/api/**', (req, res) => { });
  // Serve static files from /browser
  server.get('*.*', express.static(distFolder, {
    maxAge: '1y'
  }));
  server.get('/dashboard/**', express.static(distFolder, {
    maxAge: '1y'
  }));
  server.get('/dashboard/**', (req, res) => {
    console.log('not rendering auth page');
    res.sendFile(distFolder + '/index.html');
  });
  // All regular routes use the Universal engine
  server.get('*', (req, res) => {
    res.render(indexHtml, { req, providers: [{ provide: APP_BASE_HREF, useValue: req.baseUrl }] });
  });

  return server;
}

function run(): void {
  const port = process.env.PORT || environment.PORT;

  // Start up the Node server
  const server = app();
  server.listen(port, () => {
    console.log(`Node Express server listening on http://localhost:${port}`);
  });
}

// Webpack will replace 'require' with '__webpack_require__'
// '__non_webpack_require__' is a proxy to Node 'require'
// The below code is to ensure that the server is run only when not requiring the bundle.
declare const __non_webpack_require__: NodeRequire;
const mainModule = __non_webpack_require__.main;
const moduleFilename = mainModule && mainModule.filename || '';
if (moduleFilename === __filename || moduleFilename.includes('iisnode')) {
  run();
}

export * from './src/main.server';