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ng-smooth-scroll

Angular smooth scroll

A pure-javascript library and set of directives to scroll smoothly to an element with easing. Easing support contributed by Willem Liu with code from Gaëtan Renaudeau.

No jQuery required.

Features

  • Exposes a service that scrolls the window to an element's location
  • Provides two directives that enable smooth scrolling to elements.
  • Clean: No classes are added, no jQuery is required, no CSS files or configuration is needed.
  • Scrolling within a custom container added in 1.7.3

Installation

Include the .js file in your page then enable usage of the directive by including the "smoothScroll" module as a dependency

Bower

Install with bower with:

bower install ngSmoothScroll

Usage - As a directive

This module provides two directives:

smoothScroll:

Attribute. Scrolls the window to this element, optionally validating the expression inside scroll-if.

Example:

 
// Basic - The window will scroll to this element's position when compiling this directive
<div smooth-scroll></div>
 
// With options
<div smooth-scroll 
    duration="800" 
    easing="easeInQuint" 
    offset="120"
    callback-before="aFunction(element)" 
    callback-after="anotherFunction">
    {{...}}
</div>
    
// Inside a custom container
<div smooth-scroll 
    duration="800" 
    easing="easeInQuint" 
    offset="120"
    callback-before="aFunction(element)" 
    callback-after="anotherFunction"
    container-id="container-id">
    {{...}}
</div>
 
// With condition
<div smooth-scroll 
    scroll-if="{{ myExpression }}">
    {{...}}
</div>
 
// Inside ng-repeat
<div smooth-scroll 
    scroll-if="{{ $last }}" 
    duration="2500">
    {{...}}
</div>

scrollTo:

Attribute. Scrolls the window to the specified element ID when clicking this element.

Example:

 
// Basic
<a href="#" 
    scroll-to="my-element-3">
    Click me!
</a>
 
// Custom containers
<a href="#" 
    scroll-to="my-element-3"
    container-id="custom-container-id">
    Click me!
</a>
 
// onClick for non-anchor tags
<div scroll-to="my-element-3"
    container-id="custom-container-id">
    Click me!
</div>
 
// With options
<button 
    scroll-to="elem-id5" 
    duration="1800" 
    callback-before="aFunction(element)" 
    callback-after="anotherFunction">
    Scroll to next page.
</button>

Usage - As a service

Inject the 'smoothScroll' service in your directive / factory / controller / whatever, and call like this:

 
// Using defaults 
var element = document.getElementById('my-elem');
smoothScroll(element);
 
// With options 
var element = $elem[0];
 
var options = {
    duration: 700,
    easing: 'easeInQuad',
    offset: 120,
    callbackBefore: function(element) {
        console.log('about to scroll to element', element);
    },
    callbackAfter: function(element) {
        console.log('scrolled to element', element);
    }
}
 
smoothScroll(element, options);
 
// With options for custom container 
var element = $elem[0];
 
var options = {
    duration: 700,
    easing: 'easeInQuad',
    offset: 120,
    callbackBefore: function(element) {
        console.log('about to scroll to element', element);
    },
    callbackAfter: function(element) {
        console.log('scrolled to element', element);
    },
    containerId: 'custom-container-id'
}
 
smoothScroll(element, options);
 
// In directive's link function 
link: function($scope, $elem, $attrs){
    var options = $attrs;
 
    smoothScroll($elem[0], options);
}
 
 

Options

duration

Type: Integer Default: 0

The duration of the smooth scroll, in miliseconds.

offset

Type: Integer Default: 800

The offset from the top of the page in which the scroll should stop.

easing

type: string default: easeInOutQuart

the easing function to be used for this scroll.

callbackBefore

type: function default: function(element) {}

a callback function to run before the scroll has started. It is passed the element that will be scrolled to.

callbackAfter

type: function default: function(element) {}

a callback function to run after the scroll has completed. It is passed the element that was scrolled to.

containerId

type: string default: null

ID of the scrollable container which the element is a child of.

Easing functions

The available easing functions are:

  • 'easeInQuad'
  • 'easeOutQuad'
  • 'easeInOutQuad'
  • 'easeInCubic'
  • 'easeOutCubic'
  • 'easeInOutCubic'
  • 'easeInQuart'
  • 'easeOutQuart'
  • 'easeInOutQuart'
  • 'easeInQuint'
  • 'easeOutQuint'
  • 'easeInOutQuint'

Credits

Callback hooks contributed by Ben Armston. https://github.com/benarmston

Easing support contributed by Willem Liu. https://github.com/willemliu

Easing functions forked from Gaëtan Renaudeau. https://gist.github.com/gre/1650294

Infinite loop bugs in iOS and Chrome (when zoomed) by Alex Guzman. https://github.com/alexguzman

Support for scrolling in custom containers by Joseph Matthias Goh. https://github.com/zephinzer

Influenced by Chris Ferdinandi https://github.com/cferdinandi

Free to use under the MIT License.

Cheers.