ngx-custom-modal

A custom Modal / Dialog (with inner component support) for Angular 17+ projects.

It is an update, continuation and improvement of the modal concept Angular Custom Modal.

Demo

For a live demonstration, visit ngx-custom-modal demo.

Install

npm install ngx-custom-modal

Features

Core Features with Angular 17 Standalone Components:

• Light: No additional CSS/JS frameworks attached.
• Bootstrap 3 & 4 CSS Compatible: Ensures seamless integration with these versions of Bootstrap.
• Custom Modal Components:
  • Customizable modal headers, bodies, and footers for tailored UI design.
• Modal Stacking Support: Allows multiple modals to be opened and managed effectively.
• Lazy Inner Component Initialization: Components within modals are initialized only as needed.
• Efficient Lifecycle Management: Inner components are destroyed (ngOnDestroy) when the modal is closed, ensuring resource efficiency.

Minor:

• Optional CSS animations
• Optional parent scrolling when modal is visible
• Escape or button to close modal

Usage

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

Raw HTML

app.component.html

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

Nested Modal

app.component.html

<ngx-custom-modal #nestedModal>
  <ng-template #modalHeader><h2>Nested modal</h2></ng-template>
  <ng-template #modalBody>
    Nested modals can be created by simply adding a &lt;modal&gt; inside a &lt;modal&gt;
    ...
    <button (click)="nestedModalX.open()">Open nested modal</button>
    <ngx-custom-modal #nestedModalX>
      <ng-template #modalBody>This is the nested modal content.</ng-template>
    </ngx-custom-modal>
  </ng-template>
</ngx-custom-modal>

See example source code for more information.

Development Guidelines

Code Formatting

This project uses Prettier for code formatting. To ensure consistent code style, please format your code using Prettier before submitting any changes.

To format the codebase, run the following command:

npm run format

This command will automatically format all files in the project according to the predefined Prettier configuration.

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. Beautifying it is up to you.

Default styles

You can find the demo copy-paste styles in modal.css.

Bootstrap

Bootstrap users require no additional CSS other than the Bootstrap library (either version 3 or 4).

API

ModalComponent

Name	Type	Description
header	@ContentChild('modalHeader'): TemplateRef	Angular Template (<ng-template>) to use as header.
body	@ContentChild('modalBody'): TemplateRef	Angular Template (ng-template) to use as body.
footer	@ContentChild('modalFooter'): TemplateRef	Angular Template (ng-template) to use as footer.
closeOnOutsideClick	@Input(): boolean = true	When set to true modal will close when a click is performed outside the modal container.
open	() => void	Opens the modal.
close	() => void	Closes the modal.
isTopMost	() => boolean	Returns true is the modal is the top most modal, or false if it is underneath another modal.

Special Thanks

This project, ngx-custom-modal, was inspired by and built upon the foundational work of angular-custom-modal, created by Gerard Rovira Sánchez. A special acknowledgment to Stephen Paul for his initial Angular 2 Modal version, which laid the groundwork for these modal dialog implementations in Angular.

License

MIT © Angel Careaga