"Angular Universal third-party library is throwing an error because the window object is

Question

"Angular Universal third-party library is throwing an error because the window object is

I've been working with the ng2-mqtt library and have integrated it into my component as shown below:

 import 'ng2-mqtt/mqttws31.js';
declare var Paho: any;

However, I encountered the following error:

ReferenceError: window is not defined
    at Object.<anonymous> (/Users/Picchu/Documents/em3/node_modules/ng2-mqtt/mqttws31.js:2143:4)
    at Module._compile (module.js:556:32)
    at Object.Module._extensions..js (module.js:565:10)
    at Module.load (module.js:473:32)
    at tryModuleLoad (module.js:432:12)
    at Function.Module._load (module.js:424:3)
    at Module.require (module.js:483:17)
    at require (internal/module.js:20:19)
    at Object.<anonymous> (/Users/Picchu/Documents/em3/dist/server.js:18707:18)

Any suggestions on how to resolve this issue?

javascript angular typescript angular-universal

Answer 1

Answer №1

UPDATE

In addition to Leon Li's response, a solution is offered here for preventing the loading of components that rely on Browser APIs such as location or window from being rendered on the server side.

This particular answer provides detailed instructions on how to implement this technique.

import { PLATFORM_ID } from '@angular/core';
import { isPlatformBrowser, isPlatformServer } from '@angular/common';

constructor( @Inject(PLATFORM_ID) platformId: Object) {
  this.isBrowser = isPlatformBrowser(platformId);
}

To accomplish this, simply inject PLATFORM_ID into your service and utilize isPlatformBrowser or isPlatformServer to retrieve a Boolean value. This way, you can control the visibility of components that require Browser APIs but cannot be rendered on the server side.

Answer 2

UPDATE

In addition to Leon Li's response, a solution is offered here for preventing the loading of components that rely on Browser APIs such as location or window from being rendered on the server side.

This particular answer provides detailed instructions on how to implement this technique.

import { PLATFORM_ID } from '@angular/core';
import { isPlatformBrowser, isPlatformServer } from '@angular/common';

constructor( @Inject(PLATFORM_ID) platformId: Object) {
  this.isBrowser = isPlatformBrowser(platformId);
}

To accomplish this, simply inject PLATFORM_ID into your service and utilize isPlatformBrowser or isPlatformServer to retrieve a Boolean value. This way, you can control the visibility of components that require Browser APIs but cannot be rendered on the server side.

Answer 3

Answer №2

To prevent server errors, one effective approach is to conditionally render components that rely on the window object. This can be achieved by:

<ng-container *ngIf="isBrowser">
   <!-- mqttws31-component -->
   <mqttws31-component></mqttws31-component> 
</ng-container>

The variable isBrowser can be imported from Angular 2 as follows:

import { isBrowser } from 'angular2-universal';

In Angular 4 and above, you can declare this in your browser module like this:

// app.browser
@NgModule({
  providers: [
    { provide: 'isBrowser', useValue: true }
  ]
})

Then, inject it in the constructor of your component:

export class SomeComponent implements OnInit {
  constructor(@Inject('isBrowser') private isBrowser: boolean)
  ngOnInit() { 
    // Example usage, can be anywhere within this Component
    if (this.isBrowser) { 
      alert('We're in the browser!');
    }
}

Answer 4

To prevent server errors, one effective approach is to conditionally render components that rely on the window object. This can be achieved by:

<ng-container *ngIf="isBrowser">
   <!-- mqttws31-component -->
   <mqttws31-component></mqttws31-component> 
</ng-container>

The variable isBrowser can be imported from Angular 2 as follows:

import { isBrowser } from 'angular2-universal';

In Angular 4 and above, you can declare this in your browser module like this:

// app.browser
@NgModule({
  providers: [
    { provide: 'isBrowser', useValue: true }
  ]
})

Then, inject it in the constructor of your component:

export class SomeComponent implements OnInit {
  constructor(@Inject('isBrowser') private isBrowser: boolean)
  ngOnInit() { 
    // Example usage, can be anywhere within this Component
    if (this.isBrowser) { 
      alert('We're in the browser!');
    }
}

Answer 5

Answer №3

To incorporate Angular 6 in server.ts, follow these steps:

const domino = require('domino');
const fs = require('fs');
const path = require('path');
const template = fs.readFileSync('dist/browser/index.html').toString();
const win = domino.createWindow(template);

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;

Answer 6

To incorporate Angular 6 in server.ts, follow these steps:

const domino = require('domino');
const fs = require('fs');
const path = require('path');
const template = fs.readFileSync('dist/browser/index.html').toString();
const win = domino.createWindow(template);

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;

Answer 7

Answer №4

window is not recommended for use in universal applications on the server side, as Node.js does not support window. Using a dummy variable like global.window could interfere with Angular's detection of global variables.

If a package relies on window, it is advisable to open an issue in the repository or fork the package and modify it to avoid using window.

Even if the issue with using window is resolved, packages that depend on it are likely designed for client-side specifics and may not function correctly on the server side.

The description of the package states:

Depends on the library from:

The description of the library mentions:

The Paho JavaScript Client is an MQTT browser-based client library written in Javascript that uses WebSockets to connect to an MQTT Broker.

In cases where a third-party Angular module is not intended for server-side usage, it should be stubbed or mocked. A dummy module containing fake directives and services can be imported into app.server.ts instead of the real module.

Answer 8

window is not recommended for use in universal applications on the server side, as Node.js does not support window. Using a dummy variable like global.window could interfere with Angular's detection of global variables.

If a package relies on window, it is advisable to open an issue in the repository or fork the package and modify it to avoid using window.

Even if the issue with using window is resolved, packages that depend on it are likely designed for client-side specifics and may not function correctly on the server side.

The description of the package states:

Depends on the library from:

The description of the library mentions:

The Paho JavaScript Client is an MQTT browser-based client library written in Javascript that uses WebSockets to connect to an MQTT Broker.

In cases where a third-party Angular module is not intended for server-side usage, it should be stubbed or mocked. A dummy module containing fake directives and services can be imported into app.server.ts instead of the real module.

Answer 9

Answer №5

Employment opportunity available for ng9+

// app.module.ts
@NgModule({
  providers: [
    { provide: 'isBrowser', useValue: true }
  ]
})

Update the absolute path by removing the first /:

/assets/images/... to assets/images/...

Answer 10

Employment opportunity available for ng9+

// app.module.ts
@NgModule({
  providers: [
    { provide: 'isBrowser', useValue: true }
  ]
})

Update the absolute path by removing the first /:

/assets/images/... to assets/images/...

"Angular Universal third-party library is throwing an error because the window object is

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

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