ng-hub-ui-modal

A standalone, fully-featured Angular modal library with flexible content projection, placement support, and full CSS variable theming. No Bootstrap or ng-bootstrap dependency required.

⚠️ WARNING: BREAKING CHANGES IN VERSION 21.0.0 If you are upgrading from 1.x.x to 21.x.x and you have overridden the .modal or .modal-dialog CSS classes in your global stylesheets, please review the BREAKING_CHANGES.md document to migrate your styles to the new hub-modal BEM classes.

🧩 Library Family ng-hub-ui

This library is part of the ng-hub-ui ecosystem:

• ng-hub-ui-accordion
• ng-hub-ui-avatar
• ng-hub-ui-board
• ng-hub-ui-breadcrumbs
• ng-hub-ui-calendar
• ➡️ ng-hub-ui-modal ← you are here
• ng-hub-ui-paginable
• ng-hub-ui-portal
• ng-hub-ui-stepper
• ng-hub-ui-utils

📋 Table of Contents

• Features
• Installation
• Quick Start
• Examples
  • Open with TemplateRef
  • Open with Component
  • Open with String
  • Placement
  • Size and Fullscreen
  • Scrollable Content
  • Static Backdrop
  • Before Dismiss Guard
  • HubActiveModal in Content Component
  • Dismiss and Close Selectors
  • Multiple Stacked Modals
  • Observables: dismissAll and hasOpenModals
• API Reference
  • HubModal Service
  • HubModalRef
  • HubActiveModal
  • HubModalOptions
  • HubModalUpdatableOptions
  • HubModalPlacement
  • ModalDismissReasons
  • HubModalConfig
• Styling
• Contributing
• Support & License

Features

• Zero external dependencies: No ng-bootstrap, no Bootstrap JS.
• Three content types: Open modals with a TemplateRef, a Component class, or a plain string.
• Flexible content projection: Use CSS selectors to route content to header, body, and footer slots.
• Placement support: Anchor modals to any viewport edge — start, end, top, bottom — or keep them center.
• Modal stacking: Open multiple modals; focus management and aria-hidden are handled automatically.
• Programmatic dismiss/close guards: The beforeDismiss callback lets you intercept and prevent dismissal.
• Full keyboard & backdrop interaction: ESC key, static backdrop, backdrop click — all configurable.
• CSS Variable theming: Deep customization without overriding internal classes.
• BEM class architecture: All structural classes use the hub-modal__* prefix to avoid conflicts.
• Lifecycle Observables: shown, hidden, closed, dismissed streams for precise reactive flow.
• Global defaults: Inject HubModalConfig to set application-wide defaults.

Installation

npm install ng-hub-ui-modal

Quick Start

Standalone (recommended)

import { Component, inject, TemplateRef } from '@angular/core';
import { HubModal } from 'ng-hub-ui-modal';

@Component({
	selector: 'app-root',
	standalone: true,
	template: `
		<button (click)="open(tpl)">Open Modal</button>

		<ng-template #tpl let-close="close">
			<div class="hub-modal__header"><h5>Hello!</h5></div>
			<div class="hub-modal__body">Modal content goes here.</div>
			<div class="hub-modal__footer">
				<button (click)="close('done')">Close</button>
			</div>
		</ng-template>
	`
})
export class AppComponent {
	private modal = inject(HubModal);

	open(tpl: TemplateRef<unknown>) {
		this.modal
			.open(tpl, { headerSelector: '.hub-modal__header', footerSelector: '.hub-modal__footer' })
			.result.catch(() => {});
	}
}

NgModule (classic)

import { HubModalModule } from 'ng-hub-ui-modal';

@NgModule({
	imports: [HubModalModule]
})
export class AppModule {}

Examples

Open with TemplateRef

Open a modal whose content is defined inline as a template. The template context exposes close and dismiss functions.

import { Component, inject, TemplateRef } from '@angular/core';
import { HubModal } from 'ng-hub-ui-modal';

@Component({
	selector: 'app-example',
	standalone: true,
	template: `
		<button (click)="open(tpl)">Open Template Modal</button>

		<ng-template #tpl let-close="close" let-dismiss="dismiss">
			<div class="hub-modal__body">
				<p>This is a template modal.</p>
				<button (click)="dismiss('cancel')">Cancel</button>
				<button (click)="close('ok')">OK</button>
			</div>
		</ng-template>
	`
})
export class TemplateModalComponent {
	private modal = inject(HubModal);

	open(tpl: TemplateRef<unknown>) {
		this.modal
			.open(tpl)
			.result.then((result) => console.log('Closed with', result))
			.catch((reason) => console.log('Dismissed:', reason));
	}
}

Open with Component

Pass any Angular component class to display it inside the modal. The component can inject HubActiveModal to close or dismiss the modal from within.

import { Component, inject } from '@angular/core';
import { HubModal, HubActiveModal } from 'ng-hub-ui-modal';

/** Content component displayed inside the modal */
@Component({
	selector: 'app-confirm-dialog',
	standalone: true,
	template: `
		<div class="hub-modal__header"><h5>Confirm action</h5></div>
		<div class="hub-modal__body">Are you sure you want to proceed?</div>
		<div class="hub-modal__footer">
			<button (click)="activeModal.dismiss('no')">Cancel</button>
			<button (click)="activeModal.close(true)">Confirm</button>
		</div>
	`
})
export class ConfirmDialogComponent {
	activeModal = inject(HubActiveModal);
}

/** Host component that opens the modal */
@Component({ selector: 'app-host', standalone: true, template: `<button (click)="openConfirm()">Delete</button>` })
export class HostComponent {
	private modal = inject(HubModal);

	openConfirm() {
		this.modal
			.open(ConfirmDialogComponent, {
				headerSelector: '.hub-modal__header',
				footerSelector: '.hub-modal__footer'
			})
			.result.then((confirmed) => {
				if (confirmed) {
					/* perform deletion */
				}
			})
			.catch(() => {});
	}
}

Open with String

Display a quick text message without any additional component or template.

this.modal.open('This is a simple string modal.');

Placement

Anchor the modal to any edge of the viewport using HubModalPlacement.

import { HubModal, HubModalPlacement } from 'ng-hub-ui-modal';

// Right side panel
this.modal.open(MyComponent, { placement: HubModalPlacement.End });

// Bottom sheet
this.modal.open(MyComponent, { placement: HubModalPlacement.Bottom });

// Left drawer, vertically centered
this.modal.open(MyComponent, {
	placement: HubModalPlacement.Start,
	centered: true
});

| Value | Effect | | -------------------------- | ----------------------------- | | HubModalPlacement.Center | Centred in viewport (default) | | HubModalPlacement.Start | Left-anchored drawer | | HubModalPlacement.End | Right-anchored drawer | | HubModalPlacement.Top | Top sheet | | HubModalPlacement.Bottom | Bottom sheet |

Size and Fullscreen

// Predefined sizes
this.modal.open(MyComponent, { size: 'sm' }); // 'sm' | 'lg' | 'xl'

// Always fullscreen
this.modal.open(MyComponent, { fullscreen: true });

// Fullscreen only below 'md' breakpoint
this.modal.open(MyComponent, { fullscreen: 'md' });

Scrollable Content

When the modal content overflows, enable internal scrolling.

this.modal.open(LongContentComponent, { scrollable: true });

Static Backdrop

Prevent dismissal when clicking outside the modal.

this.modal.open(MyComponent, { backdrop: 'static' });

// Also disable ESC key
this.modal.open(MyComponent, { backdrop: 'static', keyboard: false });

Before Dismiss Guard

Use beforeDismiss to prevent or delay modal closure, e.g. to show a confirmation first.

this.modal.open(MyFormComponent, {
	beforeDismiss: () => {
		if (this.formIsDirty) {
			return confirm('You have unsaved changes. Really close?');
		}
		return true;
	}
});

// Async guard using a Promise
this.modal.open(MyComponent, {
	beforeDismiss: () => this.confirmService.ask('Discard changes?')
});

HubActiveModal in Content Component

Inject HubActiveModal into any component used as modal content to control it from within.

import { Component, inject } from '@angular/core';
import { HubActiveModal, HubModalUpdatableOptions } from 'ng-hub-ui-modal';

@Component({
	selector: 'app-my-modal',
	standalone: true,
	template: `
		<div class="hub-modal__body">
			<button (click)="save()">Save</button>
			<button (click)="cancel()">Cancel</button>
		</div>
	`
})
export class MyModalComponent {
	activeModal = inject(HubActiveModal);

	save() {
		this.activeModal.close({ saved: true });
	}

	cancel() {
		this.activeModal.dismiss('user_cancelled');
	}
}

Dismiss and Close Selectors

Automatically bind dismiss/close behaviour to DOM elements inside the modal content using CSS selectors.

this.modal.open(MyComponent, {
	dismissSelector: '[data-dismiss="modal"]',
	closeSelector: '[data-close="modal"]'
});

<!-- Inside MyComponent template -->
<button data-dismiss="modal">Cancel</button>
<button data-close="modal">OK</button>

Multiple Stacked Modals

Open modals from within a modal — the stack is managed automatically and focus is trapped to the topmost one.

@Component({ ... })
export class ParentModalComponent {
  private modal = inject(HubModal);

  openNested() {
    this.modal.open(ChildModalComponent);
  }
}

Observables: dismissAll and hasOpenModals

Use the service methods to interact with the entire modal stack.

import { HubModal } from 'ng-hub-ui-modal';

export class AppComponent {
	private modal = inject(HubModal);

	closeAll() {
		this.modal.dismissAll('route_change');
	}

	get anyOpen(): boolean {
		return this.modal.hasOpenModals();
	}
}

Listen to activeInstances for reactive updates:

this.modal.activeInstances.subscribe((refs) => {
	console.log(`${refs.length} modals open`);
});

API Reference

HubModal Service

The main entry point for opening and managing modals.

| Method | Signature | Description | | ----------------- | -------------------------------------- | ----------------------------------------------------- | | open | open(content, options?): HubModalRef | Opens a new modal with the given content and options. | | dismissAll | dismissAll(reason?): void | Dismisses all currently open modals. | | hasOpenModals | hasOpenModals(): boolean | Returns true if at least one modal is open. | | activeInstances | EventEmitter<HubModalRef[]> | Emits whenever the stack of open modals changes. |

HubModalRef

A reference to an open modal returned by HubModal.open().

| Member | Type | Description | | ------------------- | ------------------ | ----------------------------------------------------------- | | result | Promise<any> | Resolves on close(), rejects on dismiss(). | | componentInstance | T \| void | Instance of the content component (if used). | | close(result?) | void | Closes the modal and resolves result. | | dismiss(reason?) | void | Dismisses the modal and rejects result. | | update(options) | void | Updates modal options after opening. | | closed | Observable<any> | Emits when the modal is closed via close(). | | dismissed | Observable<any> | Emits when dismissed via dismiss() or user interaction. | | shown | Observable<void> | Emits once the open animation finishes. | | hidden | Observable<void> | Emits once the close animation finishes and DOM is removed. |

HubActiveModal

Inject into your content component to control the modal from within.

| Method | Description | | ------------------ | ---------------------------------------------------- | | close(result?) | Closes the modal with an optional result. | | dismiss(reason?) | Dismisses the modal with an optional reason. | | update(options) | Updates live options (same as HubModalRef.update). |

HubModalOptions

All options accepted by HubModal.open().

| Option | Type | Default | Description | | ------------------ | ------------------------------------------------------------ | ------------------------ | ----------------------------------------------------------- | | animation | boolean | true | Enables fade in/out transitions. | | ariaLabelledBy | string | — | ID of the element that labels the modal. | | ariaDescribedBy | string | — | ID of the element that describes the modal. | | backdrop | boolean \| 'static' | true | false = no backdrop, 'static' = click does not close. | | beforeDismiss | () => boolean \| Promise<boolean> | — | Guard called before dismissal. Return false to cancel. | | centered | boolean | false | Centers modal on the cross-axis for side placements. | | placement | HubModalPlacement | Center | Viewport anchor for the modal. | | container | string \| HTMLElement | body | CSS selector or element to which modals are appended. | | fullscreen | boolean \| 'sm' \| 'md' \| 'lg' \| 'xl' \| 'xxl' \| string | false | Fullscreen always or below a specific breakpoint. | | injector | Injector | — | Custom injector for content component dependencies. | | keyboard | boolean | true | Whether ESC key dismisses the modal. | | scrollable | boolean | false | Makes the modal body scroll internally. | | size | 'sm' \| 'lg' \| 'xl' \| string | — | Controls the width of the modal dialog. | | windowClass | string | — | Extra class added to the hub-modal host element. | | modalDialogClass | string | — | Extra class added to the hub-modal__dialog element. | | backdropClass | string | — | Extra class added to the hub-modal__backdrop element. | | headerSelector | string | — | CSS selector for nodes to project into the header slot. | | footerSelector | string | — | CSS selector for nodes to project into the footer slot. | | dismissSelector | string | [data-dismiss="modal"] | Selector for elements that auto-dismiss the modal on click. | | closeSelector | string | [data-close="modal"] | Selector for elements that auto-close the modal on click. | | data | any | — | Arbitrary data bound to the content component instance. |

HubModalUpdatableOptions

A subset of HubModalOptions that can be updated on an already-open modal via HubModalRef.update().

ariaLabelledBy, ariaDescribedBy, centered, placement, fullscreen, backdropClass, size, windowClass, modalDialogClass.

HubModalPlacement

import { HubModalPlacement } from 'ng-hub-ui-modal';

| Value | CSS class applied | Description | | -------------------------- | ----------------------------- | ---------------------------------------- | | HubModalPlacement.Center | (none) | Modal centred in the viewport (default). | | HubModalPlacement.Start | hub-modal--placement-start | Left edge anchor. | | HubModalPlacement.End | hub-modal--placement-end | Right edge anchor. | | HubModalPlacement.Top | hub-modal--placement-top | Top edge anchor. | | HubModalPlacement.Bottom | hub-modal--placement-bottom | Bottom edge anchor. |

ModalDismissReasons

Built-in dismiss reason constants.

import { ModalDismissReasons } from 'ng-hub-ui-modal';

modalRef.dismissed.subscribe((reason) => {
	if (reason === ModalDismissReasons.ESC) {
		/* ESC key */
	}
	if (reason === ModalDismissReasons.BACKDROP_CLICK) {
		/* backdrop */
	}
});

HubModalConfig

Inject HubModalConfig to provide application-wide default options.

import { HubModalConfig } from 'ng-hub-ui-modal';

@Injectable({ providedIn: 'root' })
export class AppModalDefaults {
	constructor(config: HubModalConfig) {
		config.animation = true;
		config.keyboard = false;
		config.backdrop = 'static';
	}
}

Styling

The library publishes a self-contained stylesheet. Import it once in your application:

@import 'ng-hub-ui-modal/src/lib/modal.scss';

CSS Variables

All visual aspects are controlled via --hub-modal-* tokens. Full reference: docs/css-variables-reference.md

Quick reference (most common tokens):

| Variable | Default | Description | | ------------------------------ | ------------------ | ------------------------- | | --hub-modal-max-width | 500px | Max dialog width | | --hub-modal-border-radius | 0.5rem | Dialog corner radius | | --hub-modal-bg | system surface | Background color | | --hub-modal-color | system text | Text color | | --hub-modal-header-padding-x | 1rem | Header horizontal padding | | --hub-modal-body-padding-x | 1rem | Body horizontal padding | | --hub-modal-backdrop-opacity | 0.5 | Backdrop opacity | | --hub-modal-transition | 0.2s ease-in-out | Animation speed |

Customization Example

/* Override at the host element level */
hub-modal-window {
	--hub-modal-max-width: 720px;
	--hub-modal-border-radius: 1rem;
	--hub-modal-backdrop-opacity: 0.7;
}

Bootstrap Integration (optional)

hub-modal-window {
	--hub-modal-bg: var(--bs-body-bg);
	--hub-modal-color: var(--bs-body-color);
	--hub-modal-border-color: var(--bs-border-color);
}

BEM Class Reference

| Class | Element | | -------------------------------- | --------------------- | | .hub-modal | Modal window host | | .hub-modal__backdrop | Backdrop overlay | | .hub-modal__dialog | Dialog container | | .hub-modal__content | Content wrapper | | .hub-modal__header | Header region | | .hub-modal__body | Body region | | .hub-modal__footer | Footer region | | .hub-modal__close | Built-in close button | | .hub-modal--placement-{value} | Placement modifier | | .hub-modal__dialog--centered | Vertical centering | | .hub-modal__dialog--scrollable | Scrollable body | | .hub-modal__dialog--fullscreen | Fullscreen modifier |

Contributing

Development Setup

git clone https://github.com/carlos-morcillo/ng-hub-ui-modal.git
cd ng-hub-ui-modal
npm install

Build the library in watch mode:

ng build modal --watch

Serve the demo application:

ng serve

Testing

ng test modal

Commit Guidelines

Commits follow the Conventional Commits format:

feat(modal): add new placement option
fix(modal): correct backdrop z-index
docs(modal): update CSS variable table

Support & License

If this library saves you time, consider supporting further development:

☕ Buy me a coffee

MIT License — © Carlos Morcillo