Jquery Anchor scroll & offset

scroll to an anchor point with offset

by toubia95

HTML

<div>stuff</div>
<a href="#content">go</a>
<div class="push">push<div>
<div id="content">content</div>
<div class="push">push<div>

CSS

/* http://stackoverflow.com/questions/11007756/offset-anchors-for-autoscrolling */

div.push{height:900px !important;width:100%;display:block}
#content {margin-top:1000px;}

JavaScript

$(document).ready(function() {

var MenuTitres = $('a[href*=#]');
var AnchorOffset = 50;
  
// ANCHORS MENU OFFSET & SCROLL
function filterPath(string) {
  return string
    .replace(/^\//,'')
    .replace(/(index|default).[a-zA-Z]{3,4}$/,'')
    .replace(/\/$/,'');
  }
  
var locationPath = filterPath(location.pathname);
var scrollElem = scrollableElement('html', 'body');

MenuTitres.each(function() {
    var thisPath = filterPath(this.pathname) || locationPath;
    if (  locationPath == thisPath
    && (location.hostname == this.hostname || !this.hostname)
    && this.hash.replace(/#/,'') ) {
      var $target = $(this.hash), target = this.hash;
      if (target) {
        var targetOffset = $target.offset().top-AnchorOffset;
        $(this).click(function(event) {
          event.preventDefault();
          $(scrollElem).animate({scrollTop: targetOffset}, 400, function() {
            //location.hash = target;
          });
        });
      }
    }
});

  // use the first element that is "scrollable"
function scrollableElement(els) {
    for (var i = 0, argLength = arguments.length; i <argLength; i++) {
      var el = arguments[i],
          $scrollElement = $(el);
      if ($scrollElement.scrollTop()> 0) {
        return el;
      } else {
        $scrollElement.scrollTop(1);
        var isScrollable = $scrollElement.scrollTop()> 0;
        $scrollElement.scrollTop(0);
        if (isScrollable) {
          return el;
        }
      }
    }
    return [];
}

});