progress test 2 <script> $(function(){ var wn = $(window); var obj = $('<div id="pageprogress">'); var footer = $('#footer'); function setPosition(){ var wn_h = wn.height(); var scr_bottom = wn.scrollTop() + wn_h; var doc_height = footer.offset().top; var sprite_interval = 40; var sprite_width = 135; var sprite_pos = 0; if(doc_height <= scr_bottom){ obj.addClass('bottom'); }else{ // move position obj.removeClass('bottom'); obj.css('top', (scr_bottom-wn_h)/(doc_height-wn_h)*(wn_h-obj.height())); // sprite sprite_pos = Math.floor(wn.scrollTop() / sprite_interval)*sprite_width; obj.css('background-position', sprite_pos+'px 0'); } } $('#container').append(obj); wn.on('scroll.pageprogress resize.pageprogress', setPosition); }) </script>
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