Angular ScrollTop Button

Lightweight, Material Design inspired button for scroll-to-top of the page. No dependencies. Pure Angular!

✓ Angular 18, Angular Universal (SSR) a Standalone Components compatible

Just hit the button to smoothly scroll back to the top of the page. Here's the demo.

• Lightweight (~2 kB gzipped)
• Angular 18 compatible
• Standalone Components compatible
• Signals compatible
• No dependencies! (only smooth scroll-behavior polyfill for iOS)
• Material Design inspired
• @angular/material compatible (example)
• Component or directive way
• Smoothly animated
• a11y ready
• Highly customizable options...
• Angular 5+ compatible

🎯 Demo (example)

Watch this demo page

Or play with it live on stackblitz.com/edit/ngx-scrolltop

📦 Install

You're not using the latest version of Angular? See our Angular compatibility instructions…

Via npm or yarn

npm install ngx-scrolltop --save # for lastest Angular only! See our compatibility table

# yarn add ngx-scrolltop

Compatibility

Angular version	ngx-scrolltop	Install
ng18	v18.x.x	npm install ngx-scrolltop@latest
ng17	v17.x.x	npm install ngx-scrolltop@17
ng16	v6.x.x	ng add ngx-scrolltop@6
ng15	v6.x.x	ng add ngx-scrolltop@6
ng14	v4.x.x	ng add ngx-scrolltop@4
ng13	v4.x.x	ng add ngx-scrolltop@4
ng12	v4.x.x	ng add ngx-scrolltop@4
ng5 – ng11	v2.x.x	ng add ngx-scrolltop@2

🗜️ Setup and usage (Standalone or Modules)

You have some options how to use this library. As a component or as a directive.

You can also use it as a Standalone component (new angular way) or as a module (the original angular way).

Standalone Component

In your root standalone component (e.g. app.component.ts) you need to add NgxScrollTopComponent into your imports array.

...
+ import { NgxScrollTopComponet } from 'ngx-scrolltop';
...

@Component({
  selector: 'app',
  standalone: true,
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.scss'],
  imports: [
+   NgxScrollTopComponent
  ],
})
export class AppComponent { }

And then in app.component.html you just need to add your new button. Usually at the end of your file.

<ngx-scrolltop></ngx-scrolltop>

See options and examples for more details...

Standalone Directive

In your root standalone component (e.g. app.component.ts) you need to add NgxScrollTopDirective into your imports array.

...
+ import { NgxScrollTopDirective } from 'ngx-scrolltop';
...

@Component({
  selector: 'app',
  standalone: true,
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.scss'],
  imports: [
+   NgxScrollTopDirective
  ],
})
export class AppComponent { }

And then in app.component.html you just need to create your new custom element... (e.g. <span>, <div>, <button>, ...)

<span ngxScrollTop class="my-custom-element-with-my-style__no-lib-style-applied-here">
  ↑ My Custom Element. ↑
</span>

Important note: No style applied, everything is up to you. Of course I recommend position: fixed, ...

See more in examples

Modules (the original Angular way)

This is the original Angular way how to import libraries (via modules). You can use it as a component or as a directive as well.

In your root module (e.g. app.module.ts) you need to add NgxScrollTopModule into your imports array.

...
+ import { NgxScrollTopModule } from 'ngx-scrolltop';
...

@NgModule({
  imports: [
    ...
+   NgxScrollTopModule
  ],
  ...
  bootstrap: [AppComponent]
})
export class AppModule { }

Next steps you can see above in Standalone Component or Standalone Directive or in examples.

⚙️ Options

Component

Option	Type	Default	Description
mode	'smart' | 'classic'	'classic'	Smart mode shows button only when you scroll more than two screens down and then you will try to go back to top. Classic mode shows button immediately when you scroll at least one screen down.
backgroundColor	string	#212121	Background color (you can use all values for backgroud-color css property). You can override theme color
symbolColor	string	#fafafa	Symbol color (you can use all values for fill svg property). You can override theme color
size	number	40	Button size [in pixels]. (Symbol will be resized automatically)
symbol	string		You can use utf8 chars for customizing symbol. For example: ↑ Removed in v2.0.0. Use content projection. See example here
position	'left' | 'right'	'right'	Left or right, that is the question...
theme	NgxScrollTopTheme	'gray'	Choose from official Material color themes

Symbol

You can use content projection for your own symbol.

<ngx-scrolltop> ↑ </ngx-scrolltop>

Or you can even use your own components or fonts (e.g. fontAwesome)

<ngx-scrolltop>
  <i class="fa fa-arrow-up"></i>
</ngx-scrolltop>

Directive

Option	Type	Default	Description
[ngxScrollTopMode]	'smart' | 'classic'	'classic'	Smart mode shows button only when you scroll more than two screens down and then you will try to go back to top.Classic mode shows button immediately when you scroll at least one screen down.

🎨 Examples

Advanced example (component)

app.component.html

<ngx-scrolltop
  [size]="50"
  backgroundColor="#33691e"
  symbolColor="#fff"
  mode="smart"
  position="left"
  theme="pink"
>
  ↑
</ngx-scrolltop>

Angular Material example (directive)

@angular/material required

app.component.html

<button
  ngxScrollTop
  [ngxScrollTopMode]="'smart'"
  class="my-custom-style"
  color="primary"
  mat-mini-fab
>
  top
</button>

app.component.scss

.my-custom-style {
  position: fixed;
  right: 20px;
  bottom: 20px;
}

🔌 Dependencies

Pure Angular! (with smooth scroll-behaviour polyfill for iOS)

🙋 FAQ

Old version of Angular

Error

If you are using older Angular (5 – 11) you will see this error on build or start:

ERROR in node_modules/ngx-scrolltop/lib/ngx-scrolltop.core.service.d.ts:13:21 - error TS2694: Namespace '"/Users/user/projects/my-project/node_modules/@angular/core/core"' has no exported member 'ɵɵFactoryDeclaration'.

Solution

Easy! Use compatibility version of this library npm install ngx-scrolltop@2 --save

See our Angular compatibility instructions…

Error

If you are using Angular 14 with latest ngx-scrolltop library, you will see this error on build or start:

Error: node_modules/ngx-scrolltop/lib/ngx-scrolltop.component.d.ts:21:18 - error TS2707: Generic type 'ɵɵComponentDeclaration' requires between 7 and 8 type arguments.

21     static ɵcmp: i0.ɵɵComponentDeclaration<NgxScrollTopComponent, "ngx-scrolltop", never, { "backgroundColor": "backgroundColor"; "symbolColor": "symbolColor"; "size": "size"; "symbol": "symbol"; "position": "position"; "theme": "theme"; "mode": "mode"; }, {}, never, ["*"], false, never>;
                    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


Error: node_modules/ngx-scrolltop/lib/ngx-scrolltop.directive.d.ts:17:18 - error TS2707: Generic type 'ɵɵDirectiveDeclaration' requires between 6 and 8 type arguments.

17     static ɵdir: i0.ɵɵDirectiveDeclaration<NgxScrollTopDirective, "[ngxScrollTop]", never, { "mode": "ngxScrollTopMode"; }, {}, never, never, false, never>;

Solution

Easy! Use compatibility version of this library npm install ngx-scrolltop@4 --save

See our Angular compatibility instructions…

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📝 License

Copyright © 2023 Lukas Bartak

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All contents are licensed under the MIT license.