I have implemented the CSS Tricks Smooth Page Scroll on my site and it's working pretty nicely. However, because I have a fixed nav at the top of the page, when the page scrolls to the appropriate anchor div, the top of the div disappears behind the nav. How can I offset the scroll (about 70px) so that the whole div is shown? I tried doing this:
var targetOffset = $target.offset().top - 70;
But that doesn't quite work. The page scrolls to the appropriate spot but then it immediately jumps back up so that the top of the div is hidden. What am I missing? Here's the code in full:
$(function() {
function filterPath(string) {
return string
.replace(/^//,'')
.replace(/(index|default).[a-zA-Z]{3,4}$/,'')
.replace(//$/,'');
}
var locationPath = filterPath(location.pathname);
var scrollElem = scrollableElement('html', 'body');
// Any links with hash tags in them (can't do ^= because of fully qualified URL potential)
$('a[href*=#]').each(function() {
// Ensure it's a same-page link
var thisPath = filterPath(this.pathname) || locationPath;
if ( locationPath == thisPath
&& (location.hostname == this.hostname || !this.hostname)
&& this.hash.replace(/#/,'') ) {
// Ensure target exists
var $target = $(this.hash), target = this.hash;
if (target) {
// Find location of target
var targetOffset = $target.offset().top - 70;
$(this).click(function(event) {
// Prevent jump-down
event.preventDefault();
// Animate to target
$(scrollElem).animate({scrollTop: targetOffset}, 400, function() {
// Set hash in URL after animation successful
location.hash = target;
});
});
}
}
});
// Use the first element that is scrollable (cross-browser fix?)
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 [];
}
});
Thanks in advance for your help.