A basic jQuery scroller

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I was looking for a nice jQuery scroller plugin for a client website and though I should write my own. I end up with a little (really basic) jQuery code.

Considering the followings CSS & HTML :

body { 
  width: 600px; 
  margin: 0 auto; 
  text-align: center; 

section { min-height: 1000px; }

h1 { font-size: 96px;}

nav { 
  position: fixed; 
  top: 0; 
  left: 0; 
  width: 100%;
  background-color: #999; 

a { 
  color: #fff; 
  font-size: 20px; 
  margin:0 30px; 
  <a href="#1">1</a>
  <a href="#2">2</a>
  <a href="#3">3</a>
  <a href="#4">4</a>

<!-- CONTENT -->
<section id="1">
  <h1>Title 1</h1>
  <p>paragraph 1</p>

<section id="2">
  <h1>Title 2</h1>
  <p>paragraph 2</p>

<section id="3">
  <h1>Title 3</h1>
  <p>paragraph 3</p>

<section id="4">
  <h1>Title 4</h1>
  <p>paragraph 3</p>

Then add the following scripts, just before the </body> tag :

$('a[href^="#"]').on('click', function(e){
    var anchor = $(this).attr('href'),
    sectionPosition = $(anchor).offset().top;
  $('html, body').animate({
    scrollTop: sectionPosition - 100

The code is really simple, and some part can be improved, but this is a really easy and quick way to set up your own scroll without installing a plugin.