Angular Toast Notification Service | ng-hub-ui-toast

Standalone Angular toast notification service with Signals, lifecycle observables, progress bar, six positions and full CSS variable theming.

Last updated Sep 6, 2026

Overview

Why teams search for this library

Use ng-hub-ui-toast when you need a zero-config imperative notification layer that coexists with Angular's standalone architecture and gives you Observable-based lifecycle hooks out of the box.

Install

npm install ng-hub-ui-toast

Jump to

Ideal for

  • form submission feedback
  • background sync notifications
  • error alerts
  • session expiry warnings

About toast

ng-hub-ui-toast is a signal-driven toast service for Angular 22+ standalone apps. Call success(), error(), warning() or info() from any component or service; the overlay container is lazily mounted the first time a notification fires. Each call returns a HubToastRef with onShown, onHidden and onTap observables and manualClose() / resetTimeout() methods. Configure defaults globally with provideToast() and override any option per-call.

Feature guides

Basic Toast Types

Four semantic types — success, error, warning and info — each mapped to the matching design-system colour token.

Examples:
Basic Types

Basic Types

Configuration Options

Control auto-dismiss timeout, progress bar, close button and tap-to-dismiss behaviour per call or globally via provideToast().

Examples:
Configuration Options

Configuration Options

The × is decorative, so this string is the whole name a screen reader announces for the toast's only control. The library ships it as the English "Close" and translates nothing: set it once for the application with provideToast({ closeButtonAriaLabel }), or per call as this demo does.

Positioning

Six fixed positions on screen: top/bottom combined with right, left or center.

Examples:
Positioning

Positioning

Deduplication

preventDuplicates silently drops new notifications that match an already-visible message and type.

Examples:
Prevent Duplicates

Prevent Duplicates

Click the button multiple times. With preventDuplicates enabled, only one toast with the same message will appear.

Capacity Control

maxOpened caps the visible stack; autoDismiss decides whether the oldest is removed or new ones are silently dropped when the cap is reached.

Examples:
Max Opened & autoDismiss

Max Opened & autoDismiss

When autoDismiss is false, new toasts are silently dropped once the cap is reached. When true, the oldest toast is removed to make room.

Lifecycle Observables

Every HubToastRef exposes onShown, onHidden and onTap observables plus manualClose() and resetTimeout() for imperative control.

Examples:
Lifecycle Observables

Lifecycle Observables

Events will appear here…

CSS Variable Theming

Every visual detail — background, radius, shadow, padding, progress bar — is a --hub-toast-* custom property that can be overridden from any ancestor element or stylesheet.

Examples:
CSS Variable Theming

CSS Variable Theming

Active token overrides (applied to this demo's container):

--hub-toast-border-radius: 0.75rem;
--hub-toast-shadow: 0 4px 20px rgba(0,0,0,.18);
--hub-toast-padding-x: 1.25rem;
--hub-toast-padding-y: 1rem;
--hub-toast-font-size: 0.9rem;

Tokens are injected from the page's stylesheet or from a style binding on any ancestor element — the container reads them via CSS inheritance.

Key features

Recent changes

Version 22.8.0 - 9/6/26, 12:00 AM

added: The accessible name of the close button is now a configuration option, closeButtonAriaLabel. The close glyph is decorative, so that name was the only thing a screen reader had to announce the single control of a toast, and it was the English literal Close, frozen in the template and unreachable from provideToast() or a per-call config. A library shipped to applications that are not in English cannot hardcode a user-facing string.

added: A FUNCTIONALITIES.md file. Nine sibling libraries carry one and the repository checklist asks for it on every change; toast had none, so nothing recorded which parts of the API a reader of the docs can actually operate and which are only prose.

changed: HubToastConfig now carries a required closeButtonAriaLabel. Only code that builds a full HubToastConfig literal by hand is affected: everything that goes through provideToast() or a per-call override keeps compiling. See BREAKING_CHANGES.md.

changed: HubToastData now carries a required restartToken signal. The data object keeps its identity for the whole life of a toast, so nothing in it could tell the rendered component to start its countdown over, and this signal is that channel. Only code that builds a HubToastData literal by hand is affected, as BREAKING_CHANGES.md explains.

fixed: A closing toast now completes its three lifecycle observables, not just onHidden. onShown and onTap were left open on a toast that no longer existed, so a consumer who subscribed without a takeUntil kept the subscription, and the toast data behind it, alive for the rest of the session, with no completion to hang a teardown on. Both remove() and clear() now close the whole lifecycle.

fixed: The documentation no longer describes a library that does not exist. README.md and README.es.md sold the package as having zero external dependencies and listed only the two Angular peers, so anyone installing by hand rather than through ng add ng-hub-ui got a module-not-found on resolveHubAccent the first time a toast fired. They also gave --hub-toast-title-font-weight as a bare 600 when the code routes it through --hub-ref-font-weight-semibold, typed positionClass as HubToastPosition when it accepts any string, named four semantic types where the stylesheet maps nine, omitted the three derived accent roles, and documented two of the eight public exports. BREAKING_CHANGES.md was also missing the 22.3.0 rename of --hub-toast-container-z-index to --hub-toast-container-zindex, the one kind of change that file exists to announce, because a renamed custom property fails silently.

fixed: HubToastRef.resetTimeout() restarts the auto-dismiss countdown, as its documentation always promised. It used to re-emit onShown$ and touch no timer state at all, so a caller who wanted to keep a toast on screen a while longer had no way to do it: the toast still vanished on its original schedule, and the spurious emission also broke the fires-once contract of onShown. A toast configured with disableTimeOut stays persistent, as before.

Version 22.7.2 - 9/1/26, 12:00 AM

changed: The homepage in the manifest points at this library's own documentation page rather than at the site root. Metadata only — nothing a consumer imports is affected.

Version 22.7.1 - 8/17/26, 12:00 AM

fixed: The published package declared no licence. An absent license field reads legally as all rights reserved; the intent was always MIT, now stated in package.json and shipped in a LICENSE file.

Version 22.7.0 - 8/14/26, 12:00 AM

changed: Replaced the deprecated Angular animation trigger with a native CSS enter animation that respects reduced-motion preferences.

removed: Removed the @angular/animations peer dependency. The package is deprecated upstream and the library no longer needs it. Applications that installed it only for ng-hub-ui-toast can drop it; those using it elsewhere are unaffected.

Version 22.6.1 - 8/8/26, 12:00 AM

fixed: Documentation links now point at the canonical localized URLs. The README linked to https://hubui.dev/<path> with no locale prefix and no trailing slash, and both forms are 301-redirected, so every reader arriving from npm or GitHub landed on a redirect instead of the canonical page.

Version 22.6.0 - 7/28/26, 12:00 AM

changed: Accent resolution now imports the canonical resolveHubAccent from ng-hub-ui-utils. The private copy under src/lib/shared/resolve-hub-accent.ts (used to resolve custom toast type accents) has been deleted in favour of the single, tested implementation shared family-wide. Behaviour is identical (the copy had not diverged): a bareword resolves to var(--hub-sys-color-<name>, <name>), a literal colour passes through unchanged, an empty value yields null.

added: NEW peer dependency: ng-hub-ui-utils >=22.7.0. Consumers must have ng-hub-ui-utils installed alongside this library (it is where resolveHubAccent lives). Users installing via ng add ng-hub-ui get it automatically; manual installs need npm i ng-hub-ui-utils.

Version 22.5.2 - 7/28/26, 12:00 AM

fixed: Toasts are announced to screen readers: role=alert/aria-live=assertive for error and warning, role=status/polite for the rest, with aria-atomic.

Version 22.5.1 - 7/9/26, 12:00 AM

fixed: NG0205: Injector has already been destroyed when a toast was raised just before teardown. The container is mounted from the .then() of a dynamic import(), which resolves on a later microtask; the mount now bails out when ApplicationRef.destroyed is set.

Version 22.5.0 - 7/7/26, 12:00 AM

added: Toast type accepts ANY colour. A custom type takes a registered accent name or a literal colour (#ff0000, rgb(...), oklch(...), a CSS named colour); the accent role family re-derives from it via color-mix. Built-in types are unchanged.

added: ng-hub-ui-toast/styles root entry. A styles/index.scss forwards hub-toast-theme, so @use 'ng-hub-ui-toast/styles' as *; exposes the mixin from the package root.

changed: BREAKING (packaging) — SCSS ships at ng-hub-ui-toast/styles. The theming mixin now builds to dist/toast/styles/... (was dist/toast/src/lib/styles/...), so @use 'ng-hub-ui-toast/styles' resolves. Update any @use that reached into src/lib/styles.

Version 22.4.0 - 7/2/26, 12:00 AM

changed: One derivation strategy — canonical accent slot. Every built-in data-type now re-bases only --hub-toast-accent; the role family (-subtle / -emphasis / -on) always recomputes locally from it, so a custom accent re-derives the whole family at runtime.

changed: The local derivations were unified to the canonical design-system formulas: -subtle mixes the accent at 12% over --hub-sys-surface-page (was 14%) and -emphasis at 80% over --hub-sys-color-ink (was 72% over --hub-sys-text-primary). Built-in types render as before; custom-type tints shift very slightly.

fixed: --hub-toast-shadow inline fallback aligned with the actual ds value of --hub-sys-shadow-md: 0 0.5rem 1rem rgba(0, 0, 0, 0.15). No change when the ds tokens are loaded.

changed: Added docs/css-variables-reference.md — the complete CSS custom-property reference — and realigned the README CSS-variable tables with the code.

Version 22.3.0 - 6/26/26, 12:00 AM

added: Open-set accent types. The built-in data-type map now also covers primary, secondary, neutral, light and dark alongside success / warning / info (and error→danger). Any other data-type keeps working with no recompile: define a single --hub-sys-color-<name>.

added: New derived accent roles --hub-toast-accent-subtle, --hub-toast-accent-emphasis and --hub-toast-accent-on, mixed locally from the single --hub-toast-accent slot.

added: The hub-toast-theme() mixin re-derives the accent role family whenever its $accent parameter is passed, so a brand accent on a custom selector recomputes -subtle / -emphasis / -on.

changed: BREAKING — canonical zindex token name: --hub-toast-container-z-index → --hub-toast-container-zindex (no hyphen, matching the --hub-sys-zindex-* convention).

changed: The accent role family and the progress-bar tint are now mixed in OKLCH instead of sRGB, for perceptually even tints across every accent. No token API change; tints shift very slightly.

Version 22.2.1 - 6/25/26, 12:00 AM

fixed: Design-token consistency pass: inline fallback defaults aligned with the canonical ng-hub-ui-ds values, and hardcoded literals (z-index, font-weight, line-height, radii, theme-aware colours) routed through their --hub-sys-* / --hub-ref-* tokens.

fixed: Toasts stack at the correct elevation: the container z-index resolves through --hub-sys-zindex-toast (1090) instead of a hardcoded 1050 (the modal-backdrop layer), so a toast can no longer be occluded by a modal backdrop.

Version 22.2.0 - 6/24/26, 12:00 AM

added: New hub-toast-theme() Sass mixin (styles/mixins/toast-theme) — re-skin a toast in one call: accent, surfaces, border/radius/shadow, spacing, typography, progress bar, close button and container tokens. Every parameter is optional, so only the ones passed are emitted.

added: ng-package.json ships the styles/ directory as a package asset, so the mixin is importable from consumers via @use 'ng-hub-ui-toast/styles/mixins/toast-theme'.

changed: Toast accent is now a full 1px border in the semantic colour instead of a thick left stripe. Built-in types take the full-strength --hub-sys-color-* accent rather than the muted border-subtle token, so their borders are noticeably more saturated. Purely visual.

removed: Removed the --hub-toast-accent-width token; the left accent stripe it sized no longer exists. The accent colour now drives the border and the progress bar through --hub-toast-accent.

Version 22.1.0 - 6/19/26, 12:00 AM

changed: Lowered the Angular peer dependency floor to `>=21.0.0`; the library now installs and runs in Angular 21 applications. No source or API changes.

Version 22.0.0 - 6/17/26, 12:00 AM

added: Initial release: `ToastService` with `success()`, `error()`, `warning()`, `info()`, `show()`, `remove()`, `clear()`.

added: `HubToastRef` with `onShown`, `onHidden`, `onTap` observables and `manualClose()` / `resetTimeout()`.

added: `ToastComponent` with signal-based auto-dismiss timer, progress bar and close button.

added: `ToastContainerComponent` with six position classes.

added: Accent system: `@each` loop for built-in types; `color-mix` open default for custom types.

added: `provideToast()` standalone provider function.

added: Angular animations: slide-in from edge on enter, fade-out on dismiss.