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Using the CloudWatch RUM Web Client with Angular 12

Add the snippet to index.html

To install the web client in an Angular application, add the snippet inside the <head> tag of index.html.

<!doctype html>
<html lang="en">
<head>
  <script>
    (function(n,i,v,r,s,c,u,x,z){x=window.AwsRumClient={q:[],n:n,i:i,v:v,r:r,c:c,u:u};window[n]=function(c,p){x.q.push({c:c,p:p});};z=document.createElement('script');z.async=true;z.src=s;document.head.insertBefore(z,document.getElementsByTagName('script')[0]);})('cwr','00000000-0000-0000-0000-000000000000','1.0.0','us-west-2','https://client.rum.us-east-1.amazonaws.com/1.0.2/cwr.js',{sessionSampleRate:1,guestRoleArn:'arn:aws:iam::000000000000:role/RUM-Monitor-us-west-2-000000000000-0000000000000-Unauth',identityPoolId:'us-west-2:00000000-0000-0000-0000-000000000000',endpoint:'https://dataplane.rum.us-west-2.amazonaws.com',telemetries:['errors','http','performance'],allowCookies:true});
  </script>
  ...
</head>
<body>
  ...
</body>

Instrument Routing to Record Page Views

If your application contains arguments in the URL's path, you likely want to record custom page IDs so that the arguments can be removed and the pages will be properly aggregated in CloudWatch. For example, if we have two URLs https://amazonaws.com/user/123 and https://amazonaws.com/user/456, we likely want to remove the user ID from the path so that the page ID is /user for both URLs.

For Angular applications, we can subscribe to the NavigationEnd event, and record a custom page ID using the URL provided by the router:

import { Router, NavigationEnd } from '@angular/router';

declare function cwr(operation: string, payload: any): void;

export class MyComponent implements OnInit {

  constructor(private router: Router) {}

  ngOnInit(): void {
    this.router.events.subscribe(event => {
      if (event instanceof NavigationEnd) {
        console.log('this.router.url');
        cwr('recordPageView', this.router.url);
      }
    });
  }

}

Instrument Error Handling to Record Errors

Angular intercepts uncaught JavaScript errors that origininate within the Angular application. Because Angular intercepts these errors, they will not be recorded by the web client. This can be fixed by creating an error handler that records uncaught errors using the web client's recordError command:

1. Create an error handler

src/app/cwr-error-handler.ts

import { ErrorHandler } from "@angular/core";

declare function cwr(operation: string, payload: any): void;

export class CwrErrorHandler implements ErrorHandler {
  handleError(error: any) {
    cwr('recordError', error);
  }
}

2. Install the error handler in the root module:

src/app/app.module.ts

import { RumErrorHandler } from './cwr-error-handler';

@NgModule({
  imports: [
      ...
  ],
  declarations: [
      ...
  ],
  bootstrap: [
      ...
  ],
  providers: [
    {
      provide: ErrorHandler,
      useClass: CwrErrorHandler
    }
  ]
})
export class AppModule { }