Overview - The Template for Success in Template Management

Compatibility with Angular Versions

Installation

npm i @ngneat/overview
yarn add @ngneat/overview

Table of Contents

• DynamicView
• Teleporting
• ViewService
  • createView
  • createComponent
  • createTemplate

DynamicView

Use the dynamicView structural directive to render a component, a template, HTML, or default template dynamically.

Let’s say we build a generic error component. What we want is to give our consumers the flexibly to create it by using one of three options:

• They can choose to use the default template
• They can choose to use their own text which can be static or dynamic
• They can choose to pass their own template or component

import { DynamicViewDirective, Content } from '@ngneat/overview';

@Component({
  template: ` <div *dynamicView="view">Default view</div> `,
  standalone: true,
  imports: [DynamicViewDirective],
})
export class ErrorComponent {
  @Input() view: Content | undefined;
}

You can also pass a context or an injector as inputs to the directive:

<h5>Component</h5>
<ng-container
  *dynamicView="component; 
    injector: myInjector; 
    context: { $implicit: 'my title' }"
/>

<h5>Template</h5>
<ng-template #tpl let-title>
  <b>{{ title }}</b>
</ng-template>

<ng-container *dynamicView="tpl; context: { $implicit: 'my title' }" />

If you pass context to a component and the value can be accessed via the injectViewContext function:

import { injectViewContext } from '@ngneat/overview';

interface Context {
  title: string;
}

@Component({
  template: `<div>{{ context().title }}</div>`,
  standalone: true,
})
export class MyDynamicComponent {
  context: Signal<Context> = injectViewContext<Context>();
}

injectViewContext returns a readonly signal with the view's context object.

Teleporting

Teleporting means rendering a view at a different location from its declaration. There are two cases it might be helpful:

• Avoid prop drilling to a nested component.
• Rendering a view at another place in the DOM while keeping its context where it’s defined.

You can read more about this approach in this article.

Use the teleportOutlet directive to define a new outlet. An outlet is an anchor where the view will be projected as a sibling.

import { TeleportOutletDirective } from '@ngneat/overview';

@Component({
  template: `
    <div class="flex">
      <ng-container teleportOutlet="someId"/>
    </div>
  `,
  standalone: true,
  imports: [TeleportOutletDirective],
})
export class FooComponent {}

Use the teleportTo directive to teleport the view to a specific outlet:

import { TeleportDirective } from '@ngneat/overview';

@Component({
  template: `
    <section *teleportTo="someId">
      {{ value }}
    </section>
  `,
  standalone: true,
  imports: [TeleportDirective],
})
export class BarComponent {
  value = '...';
}

ViewService

The ViewService provides facade methods to create modular views in Angular. It's been used in various projects like hot-toast, and helipopper.

createComponent

The createComponent method takes a Component, and returns an instance of CompRef:

import { ViewService, CompRef } from '@ngneat/overview';

@Injectable()
class ToastService {
  private viewService = inject(ViewService);
  componentRef: CompRef;

  init() {
    this.componentRef = this.viewService
      .createComponent(HotToastContainerComponent)
      .setInput('defaultConfig', defaultConfig)
      .appendTo(document.body);
  }
}

There are cases where we want to use an Angular component template in a third-party library that takes a native DOM element or a string. In this case, we can use the getRawContent or the getElement method, respectively.

import { ViewService } from '@ngneat/overview';

@Directive()
class ChartDirective {
  private viewService = inject(ViewService);

  createChart(color: string) {
    const ref = this.viewService.createComponent(FooTooltip).setInput('color', color).detectChanges(document.body);

    const content = ref.getRawContent();

    ref.destroy();

    Highcharts.chart('container', {
      tooltip: {
        formatter: function () {
          return content;
        },
        useHTML: true,
      },
    });
  }
}

createComponent Options

createComponent<Comp, Context>(component: Type<Comp>, {
  injector?: Injector,
  environmentInjector?: EnvironmentInjector,
  context?: Context,
  vcr?: ViewContainerRef,
})

createTemplate

The createTemplate method takes a TemplateRef, and returns an instance of ViewRef.

createTemplate<Context>(tpl: TemplateRef<Context>, {
  context?: Context,
  vcr?: ViewContainerRef,
  injector?: Injector,
})

createView

The createView method takes a Component, a TemplateRef or a string, and creates a View:

import { ViewService, Content } from '@ngneat/overview';

@Injectable()
class ToastService {
  private viewService = inject(ViewService);

  createToast(content: Content) {
    const ref = this.viewService.createView(content);
    document.body.appendChild(ref.getElement());
  }
}

Contributors ✨

Thanks goes to these wonderful people (emoji key):

This project follows the all-contributors specification. Contributions of any kind welcome!