I have written a simple custom section snapping script, works great in chrome and safari, but after nothing happens in firefox...
What it is does:
When scrolling stops it checks the direction and location of each secrion... if the top of a section is within a certain range either go to the top of the page or bottom. (scroll directions is also checked). Also, it accounts for the height of a fixed header. Like I said works in Chrome and Safari. Any ideas what's wrong?
$( document ).ready(function() {
var animating = false;
var mainHeader = $('#main-header');
var items = $("section");
var lastOffset = 0;
var scrollDir = 'none';
$(window).scroll(function() {
var windowHeight = $(this).height();
var currOffset = $(this).scrollTop();
var headerHeight = mainHeader.outerHeight();
if (currOffset > lastOffset) {
scrollDir = 'down';
} else {
scrollDir = 'up';
}
lastOffset = currOffset;
clearTimeout($.data(this, 'scrollTimer'));
if (!animating) {
$.data(this, 'scrollTimer', setTimeout(function() {
items.each(function(key, value) {
var currentItem = $(value);
var sectionOffset = currentItem.offset().top;
var sectionDist = sectionOffset - currOffset;
if ( scrollDir === 'up' && sectionDist > windowHeight*0.15 && sectionDist < windowHeight ) {
animating = true;
$('body').animate( { scrollTop: sectionOffset-windowHeight + 'px' }, 250);
setTimeout(function() { animating = false; }, 300);
return false;
}
else if ( scrollDir === 'down' && sectionDist < windowHeight*0.85 && sectionDist > 0 ) {
animating = true;
$('body').animate( { scrollTop: sectionOffset-headerHeight + 'px' }, 250);
setTimeout(function() { animating = false; }, 300);
return false;
}
});
}, 200));
}
});
});
