archive/simparallax
Archived
1
Fork 0
Code Releases Packages Activity

Uploaded initial code

Browse source
This commit is contained in:
Jake Howard 2015-08-13 13:36:19 +01:00
parent d71bfa5545
commit 0a3cf31b37
1 changed files with 24 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

24
parallax.js Normal file
View file

@ -0,0 +1,24 @@
function init_parallax() {
$('.parallax').each(function(){
// Calculate Offset
inset = $(this).attr('parallax-inset');
image_height = $(this).height();
range = image_height / inset;
$(this).attr('parallax-offset', range / 2);
});
console.log("Parallax Initialised.");
parallax();
}
function parallax() {
window_top = $(window).scrollTop();
window_bottom = window_top + $(window).height();
$('.parallax').each(function(){
if (!is_on_screen(this) || !$(this).attr('parallax-offset') != false) { return; }
element = $(this);
center_pos = (element.offset().top - $(window).scrollTop()) + (element.height() / 2);
perc = -(0.5 - ((window_top - center_pos) / window_bottom));
pos = Math.round((perc * element.attr('parallax-offset')) * 100) / 100;
element.css('background-position',"0px " + pos + "px");
});
}