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ngx-scroll-to

(★ 274)

Scroll to any element to enhance scroll-based features in you app. Works for Angular 4+, both AoT and SSR. No dependencies.

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# Installation Guide

1. Get the code

git clone https://github.com/nicky-lenaers/ngx-scroll-to

Downloads the entire project code from GitHub to your computer.

cd ngx-scroll-to

Moves into the project folder you just downloaded.

2. Node.js

Easy Recommended

Prerequisites

Git Needed to download the project code from GitHub.
Node.js Node.js must be installed to use npm. The LTS version is recommended.

$ npm install @nicky-lenaers/ngx-scroll-to

Downloads and installs the libraries listed in package.json.

$ npm install @nicky-lenaers/ngx-scroll-to@'13'

Downloads and installs the libraries listed in package.json.

$ npm install @nicky-lenaers/ngx-scroll-to@'9'

Downloads and installs the libraries listed in package.json.

$ npm install @nicky-lenaers/ngx-scroll-to@'2'

Downloads and installs the libraries listed in package.json.

$ npm install @nicky-lenaers/ngx-scroll-to@'1'

Downloads and installs the libraries listed in package.json.

✅ After running the command, open the address shown in the terminal (usually something like http://localhost:3000) in your browser.

Pulled directly from this repo's README.

// repository documentation

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<div align="center">
  <img src="https://user-images.githubusercontent.com/2785350/28428760-ae908006-6d7a-11e7-92ec-174bec80740e.png">
</div>
<div align="center">
  <h1>ngx-scroll-to</h1>
  <p>
    A simple Angular 4+ plugin enabling you to smooth scroll to any element on your page and enhance scroll-based features in your app. Works for <strong>Angular 4+</strong>, both <strong>AoT</strong> and <strong>SSR</strong>. No dependencies.
  </p>
  <strong>Support for Angular 9!</strong>
  <br/>
  <br/>
</div>

<table>
  <tr>
    <th align="left">Subject</th>
    <th align="left">Type</th>
    <th align="left">Badge</th>
  </tr>
  <tr>
    <th align="left">CI / CD</th>
    <td align="left">Circle CI</td>
    <td align="left">
      <a href="https://circleci.com/gh/nicky-lenaers/ngx-scroll-to" target="_blank">
        <img src="https://img.shields.io/circleci/project/github/nicky-lenaers/ngx-scroll-to/master.svg?style=flat-square" alt="Circle CI">
      </a>
    </td>
  </tr>
  <tr>
    <th align="left">Releases</th>
    <td align="left">GitHub</td>
    <td align="left">
      <a href="https://github.com/nicky-lenaers/ngx-scroll-to/releases" target="_blank">
        <img src="https://img.shields.io/github/release/nicky-lenaers/ngx-scroll-to.svg?style=flat-square" alt="GitHub Release">
      </a>
    </td>
  </tr>
  <tr>
    <td>&nbsp;</td>
    <td>NPM</td>
    <td align="left">
      <a href="https://www.npmjs.com/package/@nicky-lenaers/ngx-scroll-to" target="_blank">
        <img src="https://img.shields.io/npm/v/@nicky-lenaers/ngx-scroll-to.svg?style=flat-square" alt="NPM Release">
      </a>
    </td>
  </tr>
  <tr>
    <th align="left" valign="top">Dependencies</th>
    <td align="left">Production</td>
    <td align="left">
      <a href="https://david-dm.org/nicky-lenaers/ngx-scroll-to" target="_blank">
        <img src="https://img.shields.io/david/nicky-lenaers/ngx-scroll-to.svg?style=flat-square" alt="Production Dependencies">
      </a>
    </td>
  </tr>
  <tr>
    <td>&nbsp;</td>
    <td align="left">Peer</td>
    <td align="left">
      <a href="https://david-dm.org/nicky-lenaers/ngx-scroll-to?type=peer" target="_blank">
        <img src="https://img.shields.io/david/peer/nicky-lenaers/ngx-scroll-to.svg?style=flat-square" alt="Peer Dependencies">
      </a>
    </td>
  </tr>
  <tr>
    <td>&nbsp;</td>
    <td align="left">Development</td>
    <td align="left">
      <a href="https://david-dm.org/nicky-lenaers/ngx-scroll-to?type=dev" target="_blank">
        <img src="https://img.shields.io/david/dev/nicky-lenaers/ngx-scroll-to.svg?style=flat-square" alt="Development Dependencies">
      </a>
    </td>
  </tr>
  <tr>
    <td>&nbsp;</td>
    <td align="left">Optional</td>
    <td align="left">
      <a href="https://david-dm.org/nicky-lenaers/ngx-scroll-to?type=optional" target="_blank">
        <img src="https://img.shields.io/david/optional/nicky-lenaers/ngx-scroll-to.svg?style=flat-square" alt="Optional Dependencies">
      </a>
    </td>
  </tr>
  <tr>
    <th align="left" valign="top">Downloads</th>
    <td>NPM</td>
    <td>
      <a href="https://npmjs.org/@nicky-lenaers/ngx-scroll-to" target="_blank">
        <img src="https://img.shields.io/npm/dm/%40nicky-lenaers%2Fngx-scroll-to.svg?style=flat-square" alt="NPM Monthly Downloads">
      </a>
    </td>
  </tr>
  <tr>
    <th align="left" valign="top">License</th>
    <td>MIT</td>
    <td>
      <a href="https://github.com/nicky-lenaers/ngx-scroll-to/blob/master/LICENSE" target="_blank">
        <img src="https://img.shields.io/npm/l/@nicky-lenaers/ngx-scroll-to.svg?style=flat-square" alt="License">
      </a>
    </td>
  </tr>
</table>

Current Angular Version

[![npm version](https://img.shields.io/npm/v/%40angular%2Fcore.svg?style=flat-square)](https://www.npmjs.com/~angular)

## Installation
Angular 14
```sh
$ npm install @nicky-lenaers/ngx-scroll-to
```
Angular 13
```sh
$ npm install @nicky-lenaers/ngx-scroll-to@'13'
```
Angular 8 and 9
```sh
$ npm install @nicky-lenaers/ngx-scroll-to@'9'
```
Angular 7
```sh
$ npm install @nicky-lenaers/ngx-scroll-to@'2'
```
Angular 6
```sh
$ npm install @nicky-lenaers/ngx-scroll-to@'1'
```
Angular <= 5.x
```sh
$ npm install @nicky-lenaers/ngx-scroll-to@'<1'
```

## Setup
```typescript
...
import { ScrollToModule } from '@nicky-lenaers/ngx-scroll-to';
...

@NgModule({
  imports: [
    ...
    ScrollToModule.forRoot()
  ],
  ...
  bootstrap: [AppComponent]
})
export class AppModule { }
```

## Basic Usage - Directive to Target
**my.component.html**

```html

<button [ngxScrollTo]="'#destination'">Go to destination</button>

<button [ngxScrollTo]="'destination'">Go to destination</button>

<button [ngxScrollTo]="destinationRef">Go to destination</button>

<div id="destination" #destinationRef>
  You've reached your destination.
</div>
```

## Basic Usage - Directive to Offset Only
Besides scrolling to a specific element, it is also possible to scroll a given offset only. This can be achieved by an empty target and an offset:

**my.component.html**

```html
<button 
  ngxScrollTo
  [ngxScrollToOffset]="200">
  Go down 200 pixels
</button>
```

## Basic Usage - Service to Target
**my.component.html**
```html
<button (click)="triggerScrollTo()">Go to destination</button>

<div id="destination">
  You've reached your destination.
</div>
```

**my.service.ts**

```typescript
import { Injectable } from '@angular/core';
import { ScrollToService, ScrollToConfigOptions } from '@nicky-lenaers/ngx-scroll-to';

@Injectable()
export class MyService {

constructor(private scrollToService: ScrollToService) { }

triggerScrollTo() {
    
    const config: ScrollToConfigOptions = {
      target: 'destination'
    };

this.scrollToService.scrollTo(config);
  }
}
```

## Basic Usage - Service to Offset Only
Just like with the Directive, the Service can be used to scroll to an offset only instead of a given target element:

**my.component.html**
```html
<button (click)="triggerScrollToOffsetOnly(200)">Go down 200 pixels</button>
```

**my.service.ts**

```typescript
import { Injectable } from '@angular/core';
import { ScrollToService, ScrollToConfigOptions } from '@nicky-lenaers/ngx-scroll-to';

@Injectable()
export class MyService {

constructor(private scrollToService: ScrollToService) { }

triggerScrollToOffsetOnly(offset: number = 0) {
    
    const config: ScrollToConfigOptions = {
      offset
    };

this.scrollToService.scrollTo(config);
  }
}
```

## Advanced Usage - Directive
**my.component.ts**
```typescript
import { ScrollToAnimationEasing, ScrollToEvent, ScrollToOffsetMap } from '@nicky-lenaers/ngx-scroll-to';

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

ngxScrollToDestination: string;
  ngxScrollToEvent: ScrollToEvent;
  ngxScrollToDuration: number;
  ngxScrollToEasing: ScrollToAnimationEasing;
  ngxScrollToOffset: number;
  ngxScrollToOffsetMap: ScrollToOffsetMap;

constructor() {

this.ngxScrollToDestination = 'destination-1';
    this.ngxScrollToEvent = 'mouseenter';
    this.ngxScrollToDuration = 1500;
    this.ngxScrollToEasing = 'easeOutElastic';
    this.ngxScrollToOffset = 300;
    this.ngxScrollToOffsetMap = new Map();
    this.ngxScrollToOffsetMap
      .set(480, 100)
      .set(768, 200)
      .set(1240, 300)
      .set(1920, 400)

}

toggleDestination() {
    this.ngxScrollToDestination = this.ngxScrollToDestination === 'destination-1' ? 'destination-2' : 'destination-1';
  }
}
```

**my.component.html**
```html
<button (click)="toggleDestination()">Toggle Destination</button>

<button 
  [ngxScrollTo]="ngxScrollToDestination"
  [ngxScrollToEvent]="ngxScrollToEvent"
  [ngxScrollToDuration]="ngxScrollToDuration"
  [ngxScrollToEasing]="ngxScrollToEasing"
  [ngxScrollToOffset]="ngxScrollToOffset"
  [ngxScrollToOffsetMap]="ngxScrollToOffsetMap">
  Go to destination
</button>

<div id="destination-1">
  You've reached your first destination
</div>

<div id="destination-2">
  You've reached your second destination
</div>
```

## Advanced Usage - Service
**my.component.html**
```html
<button (click)="triggerScrollTo()">Go to destination</button>

<div id="custom-container">
  <div id="destination">
    You've reached your destination.
  </div>
</div>
```

**my.service.ts**

```typescript
import { Injectable } from '@angular/core';
import { ScrollToService, ScrollToConfigOptions } from '@nicky-lenaers/ngx-scroll-to';

@Injectable()
export class MyService {

constructor(private scrollToService: ScrollToService) { }

triggerScrollTo() {
    
    /**
     * @see NOTE:1
     */
    const config: ScrollToConfigOptions = {
      container: 'custom-container',
      target: 'destination',
      duration: 650,
      easing: 'easeOutElastic',
      offset: 20
    };

this.scrollToService.scrollTo(config);
  }
}
```
**NOTE:1**

*The `container` property is an optional property. By default, `ngxScrollTo` searches for the first scrollable parent `HTMLElement` with respect to the specified `target`. This should suffice in most cases. However, if multiple scrollable parents reside in the DOM tree, you have the degree of freedom the specify a specific container by using the `container` property, as used in the above example.*

## Directive Attributes Map
<table>
  <tr>
    <th align="left">Options</th>
    <th align="left">Type</th>
    <th align="left">Default</th>
  </tr>
  <tr>
    <td><a href="#ngx-scroll-to-details">ngxScrollTo</a></td>
    <td><code>string</code> | <code>number</code> | <code>ElementRef</code> | <code>HTMLElement</code></td>
    <td><code>''</code></td>
  </tr>
  <tr>
    <td><a href="#ngx-scroll-to-event-details">ngxScrollToEvent</a></td>
    <td><code>ScrollToEvent</code></td>
    <td><code>click</code></td>
  </tr>
  <tr>
    <td><a href="#ngx-scroll-to-duration-details">ngxScrollToDuration</a></td>
    <td><code>number</code></td>
    <td><code>650</code></td>
  </tr>
  <tr>
    <td><a href="#ngx-scroll-to-easing-details">ngxScrollToEasing</a></td>
    <td><code>ScrollToAnimationEasing</code></td>
    <td><code>easeInOutQuad</code></td>
  </tr>
  <tr>
    <td><a href="#ngx-scroll-to-offset-details">ngxScrollToOffset</a></td>
    <td><code>number</code></td>
    <td><code>0</code></td>
  </tr>
  <tr>
    <td><a href="#ngx-scroll-to-offset-map-details">ngxScrollToOffsetMap</a></td>
    <td><code>ScrollToOffsetMap</code></td>
    <td><code>new Map()</code></td>
  </tr>
</table>

## Error Handling
In some occasions, one might misspell a target or container selector string. Even though `ngx-scoll-to` will not be able to initiate the scrolling animation, you can catch the internally generated error and handle it as you please on the `Observable` chain returned from the `scrollTo` method.

**faulty.service.ts**
```typescript
import { Injectable } from '@angular/core';
import { ScrollToService } from '@nicky-lenaers/ngx-scroll-to';

@Injectable()
export class FaultyService {

constructor(private scrollToService: ScrollToService) { }

triggerScrollTo() {
    
    this.scrollToService
      .scrollTo({
        target: 'faulty-id'
      })
      .subscribe(
        value => { console.log(value) },
        err => console.error(err) // Error is caught and logged instead of thrown
      );
  }
}
```

## Directive Attribute Map Details
#### <a name="ngx-scroll-to-details"></a>`[ngxScrollTo]`
This value specifies the ID of the HTML Element to scroll to. Note the outer double quotes `""` and the inner single quotes `''` in the above example(s). This enables you to dynamically set the string value based on a class property of your Component.

#### <a name="ngx-scroll-to-event-details"></a>`[ngxScrollToEvent]`
This value controls to event on which to trigger the scroll animation. Allowed values are:
- `click`
- `mouseenter`
- `mouseover`
- `mousedown`
- `mouseup`
- `dblclick`
- `contextmenu`
- `wheel`
- `mouseleave`
- `mouseout`

#### <a name="ngx-scroll-to-duration-details"></a>`[ngxScrollToDuration]`
This value controls to duration of your scroll animation. Note that this value is in milliseconds.

#### <a name="ngx-scroll-to-easing-details"></a>`[ngxScrollToEasing]`
This value controls a named easing logic function to control your animation easing. Allowed values are:
- `easeInQuad`
- `easeOutQuad`
- `easeInOutQuad`
- `easeInCubic`
- `easeOutCubic`
- `easeInOutCubic`
- `easeInQuart`
- `easeOutQuart`
- `easeInOutQuart`
- `easeInQuint`
- `easeOutQuint`
- `easeInOutQuint`
- `easeOutElastic`

#### <a name="ngx-scroll-to-offset-details"></a>`[ngxScrollToOffset]`
This value controls the offset with respect to the top of the destination HTML element. Note that this value is in pixels.

#### <a name="ngx-scroll-to-offset-map-details"></a>`[ngxScrollToOffsetMap]`
This value allows you to control dynamic offsets based on the width of the device screen. The Map get's iterated over internally in a sequential fashion, meaning you need to supply key values in the order from low to high. The `key` of the `Map` defines the width treshold. The `value` of the `Map` defines the offset. Note that this value is in pixels.

# Contributing
Please see [Contributing Guidelines](.github/CONTRIBUTING.md).

# Code of Conduct
Please see [Code of Conduct](.github/CODE_OF_CONDUCT.md).

# License
 [MIT](/LICENSE)