Angular2 bootstrapping of multiple components

Question

Angular2 bootstrapping of multiple components

My query pertains to the following issue raised on Stack Overflow: Error when bootstrapping multiple angular2 modules

In my index.html, I have included the code snippet below:

  <app-header>Loading header...</app-header>
  <app-root>Loading...</app-root>
  <app-footer>Loading footer...</app-footer>

The components mentioned in the code above are being supplied in my app.module.ts for bootstrapping:

bootstrap: [AppComponent,HeaderComponent,FooterComponent]

These components are then bootstrapped in my main.ts file as follows:

platformBrowserDynamic().bootstrapModule(AppModule);

Currently, the application functions correctly when all three modules are included. However, if any one of them is removed, the app continues to work but errors are displayed in the console[img attached].

I am attempting to create standalone modules within a single component that can be easily integrated or excluded from the application as needed. For example, having separate modules for the header, footer, and body allows flexibility in selecting which components to include based on specific page requirements. In certain instances, excluding the app-header may be necessary.

Would appreciate feedback on whether my approach aligns with best practices?

javascript angular typescript

Answer 1

Answer №1

I stumbled upon this article and it worked perfectly for me

import { NgModule, Injectable, APP_INITIALIZER, ApplicationRef, Type, ComponentFactoryResolver } from '@angular/core';
import {FooterComponent} from './footercomponent';
import {AppComponent} from './appcomponent';
import {HeaderComponent} from './headercomponent';

const components = [AppComponent, HeaderComponent, FooterComponent];

@NgModule({
  declarations: [
    AppComponent,
    HeaderComponent,
    FooterComponent
  ],
  imports: [
    BrowserModule,
    FormsModule,
    HttpModule
  ],
  entryComponents: components,
  providers: []
})
export class AppModule {

    constructor(private resolver: ComponentFactoryResolver) { }

    ngDoBootstrap(appRef: ApplicationRef) {
        components.forEach((componentDef: Type<{}>) => {
            const factory = this.resolver.resolveComponentFactory(componentDef);
            if (document.querySelector(factory.selector)) {
                appRef.bootstrap(factory);
            }
        });
    }
}

Answer 2

I stumbled upon this article and it worked perfectly for me

import { NgModule, Injectable, APP_INITIALIZER, ApplicationRef, Type, ComponentFactoryResolver } from '@angular/core';
import {FooterComponent} from './footercomponent';
import {AppComponent} from './appcomponent';
import {HeaderComponent} from './headercomponent';

const components = [AppComponent, HeaderComponent, FooterComponent];

@NgModule({
  declarations: [
    AppComponent,
    HeaderComponent,
    FooterComponent
  ],
  imports: [
    BrowserModule,
    FormsModule,
    HttpModule
  ],
  entryComponents: components,
  providers: []
})
export class AppModule {

    constructor(private resolver: ComponentFactoryResolver) { }

    ngDoBootstrap(appRef: ApplicationRef) {
        components.forEach((componentDef: Type<{}>) => {
            const factory = this.resolver.resolveComponentFactory(componentDef);
            if (document.querySelector(factory.selector)) {
                appRef.bootstrap(factory);
            }
        });
    }
}

Answer 3

Answer №2

Utilizing Modules:

@NgModule({
  declarations: [App1],
  exports: [App1]
})
export class App1Module
  
@NgModule({
  declarations: [App2],
  exports: [App2]
})
export class App2Module
  
@NgModule({
 imports: [App1Module, App2Module],
 exports: [App1Module, App2Module]
})
export class MainModule

When incorporating these modules, you can choose to include all of them or only the ones that are relevant.

While you have the option to create separate modules for each component and import them as needed, you can also bootstrap multiple components by listing them in an array under the 'bootstrap' property.

For example:

@NgModule({
  imports: [],
  declarations: [App1, App2, App3],
  bootstrap: [App1, App2, App3]
})
export class BaseModule {}

If all the bootstrapping components are set up correctly from the beginning, something like this should work:

<body>
   <app1>App1</app1>
  <app2>App1</app2>
  <app3>App1</app3>
</body>

This approach is worth trying out for your project requirements.

For more detailed information:

How to dynamically create bootstrap modals as Angular2 components?

https://plnkr.co/edit/akm7OPahe72Ex9i2ZXej?p=preview

I hope this explanation proves useful. Feel free to reach out for further assistance.

Let me know if you require any additional modifications.

Answer 4

Utilizing Modules:

@NgModule({
  declarations: [App1],
  exports: [App1]
})
export class App1Module
  
@NgModule({
  declarations: [App2],
  exports: [App2]
})
export class App2Module
  
@NgModule({
 imports: [App1Module, App2Module],
 exports: [App1Module, App2Module]
})
export class MainModule

When incorporating these modules, you can choose to include all of them or only the ones that are relevant.

While you have the option to create separate modules for each component and import them as needed, you can also bootstrap multiple components by listing them in an array under the 'bootstrap' property.

For example:

@NgModule({
  imports: [],
  declarations: [App1, App2, App3],
  bootstrap: [App1, App2, App3]
})
export class BaseModule {}

If all the bootstrapping components are set up correctly from the beginning, something like this should work:

<body>
   <app1>App1</app1>
  <app2>App1</app2>
  <app3>App1</app3>
</body>

This approach is worth trying out for your project requirements.

For more detailed information:

How to dynamically create bootstrap modals as Angular2 components?

https://plnkr.co/edit/akm7OPahe72Ex9i2ZXej?p=preview

I hope this explanation proves useful. Feel free to reach out for further assistance.

Let me know if you require any additional modifications.

Answer 5

Answer №3

Hey there,

If I were in your shoes, I'd start by bootstrapping the whole application in one go:

<fullApp>Loading...</fullApp>

Afterwards, I'd create separate components for the header and footer and then include them as nested views within the main component.

Answer 6

Hey there,

If I were in your shoes, I'd start by bootstrapping the whole application in one go:

<fullApp>Loading...</fullApp>

Afterwards, I'd create separate components for the header and footer and then include them as nested views within the main component.

Angular2 bootstrapping of multiple components

Answer №1

Answer №2

Answer №3

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