Angular8 通用window未定义

Question

菜鸟（几乎）在这里！

我有一个基于 "@angular/core": "^8.2.14", 的 Angular 应用程序，它是 CSR（客户端渲染）。现在我想把它切换到SSR（服务端渲染）。

我已经一步步完成了 Angular documentation ，但是我的应用程序找不到 window 对象，我在很多网站上搜索了解决方案，这是我最后的 server.ts下面的文件，但我的应用找不到 window，有时找不到其他软件包，如 SVG！

// These are important and needed before anything else
import 'zone.js/dist/zone-node';
import 'reflect-metadata';

import {enableProdMode} from '@angular/core';

import * as express from 'express';
import {join} from 'path';

// Faster server renders w/ Prod mode (dev mode never needed)
enableProdMode();

// Express server
const app = express();

const PORT = process.env.PORT || 4000;
const DIST_FOLDER = join(process.cwd(), 'dist');

const domino = require('domino');
const fs = require('fs');
const path = require('path');
// index from browser build!
const template = fs.readFileSync(path.join('.', 'dist', 'browser', 'index.html')).toString();
// for mock global window by domino
const win = domino.createWindow(template);
// mock
global['window'] = win;
// not implemented property and functions
Object.defineProperty(win.document.body.style, 'transform', {
    value: () => {
        return {
            enumerable: true,
            configurable: true,
        };
    },
});
// mock documnet
global['document'] = win.document;
// othres mock
global['CSS'] = null;
// global['XMLHttpRequest'] = require('xmlhttprequest').XMLHttpRequest;
global['Prism'] = null;

// * NOTE :: leave this as require() since this file is built Dynamically from webpack
const {AppServerModuleNgFactory, LAZY_MODULE_MAP} = require('./dist/metronic-server/main');

// Express Engine
import {ngExpressEngine} from '@nguniversal/express-engine';
// Import module map for lazy loading
import {provideModuleMap} from '@nguniversal/module-map-ngfactory-loader';

app.engine('html', ngExpressEngine({
    bootstrap: AppServerModuleNgFactory,
    providers: [
        provideModuleMap(LAZY_MODULE_MAP)
    ]
}));

app.set('view engine', 'html');
app.set('views', join(DIST_FOLDER, 'browser'));

// TODO: implement data requests securely
app.get('/api/*', (req, res) => {
    res.status(404).send('data requests are not supported');
});

// Server static files from /browser
app.get('*.*', express.static(join(DIST_FOLDER, 'browser')));

// All regular routes use the Universal engine
app.get('*', (req, res) => {
    global['navigator'] = {userAgent: req['headers']['user-agent']} as Navigator;
    res.render('index', {req});
});

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

但我仍然有错误：

我该如何解决这个错误？

非常感谢。

Answer 1

由于 Angular Universal 是服务器端呈现的，因此没有 window 对象服务器端。这意味着您要么需要像 server.ts 文件中的 here 那样模拟 window 对象：

const domino = require('domino');
const fs = require('fs');
const path = require('path');
const templateA = fs
.readFileSync(path.join('.', 'dist', 'index.html'))
.toString();
const win = domino.createWindow(templateA);
win.Object = Object;
win.Math = Math;

win.navigator.language = 'en';

global['Event'] = null;
global['window'] = win;
global['document'] = win.document;
global['branch'] = null;
global['object'] = win.object;
global['localStorage'] = localStorage;
global['sessionStorage'] = sessionstorage;
global['navigator'] = win.navigator ;

或者在你的 Angular 文件中用

if (isPlatformBrowser(platformId)) {
  window.*
}

参考this answer

Angular8 通用window未定义

Angular 8 universal window is not defined

angular-universal

angular