Angular Express Engine
This is an Express Engine for running Angular Apps on the server for server side rendering.
Usage
npm install @nguniversal/express-engine --save
To use it, set the engine and then route requests to it
import express from 'express';
import { ngExpressEngine } from '@nguniversal/express-engine';
const app = express();
// Set the engine
app.engine(
'html',
ngExpressEngine({
bootstrap: ServerAppModule, // Give it a module to bootstrap
}),
);
app.set('view engine', 'html');
app.get('/**/*', (req: Request, res: Response) => {
res.render('../dist/index', {
req,
res,
});
});Configuring the URL and Document
It is possible to override the default URL and document fetched when the rendering engine
is called. To do so, simply pass in a url and/or document string to the renderer as follows:
app.get('/**/*', (req: Request, res: Response) => {
let url = 'http://someurl.com';
let doc = '<html><head><title>New doc</title></head></html>';
res.render('../dist/index', {
req,
res,
url,
document: doc,
});
});Extra Providers
Extra Providers can be provided either on engine setup
app.engine(
'html',
ngExpressEngine({
bootstrap: ServerAppModule,
providers: [ServerService],
}),
);Advanced Usage
Request based Bootstrap
The Bootstrap module as well as more providers can be passed on request
app.get('/**/*', (req: Request, res: Response) => {
res.render('../dist/index', {
req,
res,
bootstrap: OtherServerAppModule,
providers: [OtherServerService],
});
});Using the Request and Response
The Request and Response objects are injected into the app via injection tokens. You can access them by @Inject
import { Request } from 'express';
import { REQUEST } from '@nguniversal/express-engine/tokens';
@Injectable()
export class RequestService {
constructor(@Inject(REQUEST) private request: Request) {}
}If your app runs on the client side too, you will have to provide your own versions of these in the client app.
Using a Custom Callback
You can also use a custom callback to better handle your errors
app.get('/**/*', (req: Request, res: Response) => {
res.render(
'../dist/index',
{
req,
res,
},
(err: Error, html: string) => {
res.status(html ? 200 : 500).send(html || err.message);
},
);
});