javascript - Switching CSS Background Image With jQuery On Scroll -


i'm trying header made gets smaller on scroll. currently, code looks jquery involved in header size:

$(function() {     $('#header').data('size','big'); });  $(window).scroll(function() {     if ($(document).scrolltop() > 0) {         if ($('#header').data('size') == 'big') {             $('#header').data('size', 'small');             $('#header').stop().animate({                 height: '60px'             }, 600);         }     } else {         if ($('#header').data('size') == 'small') {             $('#header').data('size', 'big');             $('#header').stop().animate({                 height: '100px'             }, 600);         }       } });

it working great, , have header size portion down. how can replicate in order change size of logo 80 x 80 40 x 40 (and include transition)?

here's css logo:

#logo {     background: url("images/logo.png") no-repeat;     position: absolute;     top: 8px;     width: 81px;     height: 85px;     z-index: 73;     -webkit-transition: background-image .5s;     margin-left: 100px; }

site url http://www.tremor.yt/site/creators.html

*edited include full code

your js:

$(function() {     $('#header').data('size','big'); });  $(window).scroll(function() {     if ($(document).scrolltop() > 0) {         if ($('#header').data('size') == 'big') {             $('#header').data('size', 'small');             $('#header').stop().animate({                 height: '60px'             }, 600);             $('#logo').stop().animate({                 height: '40px',                 width: '40px'             },600);         }     } else {         if ($('#header').data('size') == 'small') {             $('#header').data('size', 'big');             $('#header').stop().animate({                 height: '100px'             }, 600);             $('#logo').stop().animate({                 height: '85px',                 width: '81px'             },600);         }       } });

and css:

#logo {     background: url("images/logo.png") no-repeat;     background-size: contain;     position: absolute;     top: 8px;     width: 81px;     height: 85px;     z-index: 73;     -webkit-transition: background-image .5s;     margin-left: 100px; }

i'd point out while jquery nice , easily, (myself included) might consider preferable toggle css class (something 'smaller') on both #header , #logo , use css resizing , animation. css transition be:

#header, #logo {     transition: height 0.6s, width 0.6s; }

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