Angular Custom Modal

Angular2+ Modal / Dialog (with inner component support).

A continuation of https://stackoverflow.com/a/46949848

Demo

zurfyx.github.io/angular-custom-modal

Install

npm install angular-custom-modal

Features

• Light: no CSS / JS frameworks attached
• Bootstrap CSS compatible
• Custom modal header, body and header
• Modal stacking support
• Lazy inner component initialization, and ngOnDestroy(ed) when modal is closed
• Parent scrolling disabled when modal is visible

Usage

app.module.ts

imports: [
  ...
  ModalModule,
  ...
],
...
})

Raw HTML

app.component.html

<button (click)="htmlInsideModal.open()">Raw HTML inside modal</button>
<modal #htmlInsideModal>
  <ng-template #modalHeader><h2>HTML inside modal</h2></ng-template>
  <ng-template #modalBody>
    <p>HTML content inside modal</p>
  </ng-template>
</modal>

Component inside Modal

my-component.component.ts

@Component({
  selector: 'app-my-component',
  templateUrl: 'my-component.component.html',
})
export class AppModalContentComponent { }

my-component.component.html

<p>My component's HTML</p>

app.component.html

<button (click)="componentInsideModal.open()">Component inside modal</button>
<modal #componentInsideModal>
  <ng-template #modalHeader><h2>Component inside modal</h2></ng-template>
  <ng-template #modalBody>
    <app-my-component></app-my-component>
  </ng-template>
  <ng-template #modalFooter></ng-template>
</modal>

See example source code for more information.

Why ng-template?

ng-template prevents the parent component from initializing the component. Only when the modal library finds it convenient the component will be initialize and visible to the user. Hence, it preserves the natural ngOnInit() and ngOnDestroy() that we expect.

Similar libraries which make use of <ng-content> and its content transclution strategy, do not prevent the component from initializing, but rather just hide it. The component was already initialized in the parent component.

References:
https://angular.io/api/common/NgTemplateOutlet
https://blog.angular-university.io/angular-ng-template-ng-container-ngtemplateoutlet/
https://medium.com/claritydesignsystem/ng-content-the-hidden-docs-96a29d70d11b
https://netbasal.com/understanding-viewchildren-contentchildren-and-querylist-in-angular-896b0c689f6e

Styles

The library carries the minimum generic styles. Styles are up to you.

You can find the demo copy-paste styles in app.component.scss (specific modal styles starting here).

TODO

• Modal header/body/footer as a component or directive (not sure if feasable)
• Optional styles
• Optional scrolling when modal is active
• Optional visibility

Special thanks

To Stephen Paul for the initial Angular 2 Modal version.

License

MIT © Gerard Rovira Sánchez