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POChange only y-position in background while scrolling
 

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  1. POChange only y-position in background while scrolling
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    <blockquote> <p><strong>Possible Duplicate:</strong><br> <a href="https://stackoverflow.com/questions/4900212/changing-only-y-pos-of-background-image-via-jquery">Changing only y pos of background image via Jquery</a> </p> </blockquote> <p>I want to change only y-position of backournd of .nav-logo while scrolling and keeping x-position consant. I have implemented like this but doesnot get result. Here is my usage code</p> <pre><code>jQuery(document).ready(function($) { a=parseFloat(-28);// valor inccial para el background 1 b=parseFloat(1);// valor inccial para el background 1 var scrollTop = $(window).scrollTop(); var scroll_actually= new Array();// identifica los valoares del background X y Y $(window).scroll(function(){//this is not the cleanest way to do this, I'm just keeping it short. if(scrollTop&gt;$(this).scrollTop()) // desplazamiento hacia arriba { if (getScrollTop()&lt;=100 &amp;&amp; getScrollTop()&gt;=0)// identyifica cuando la posicion del background_1 esta en scroll { a=a+1;// posicion del background1 decrementa en 1 pixeles b=b+1;// posicion de background1 decrementa en 1 pizeles $('a.qa-logo-link').css('top', +a+'px'); $('.nav-logo a').css('background-position', -1+'px' , 0+b+'px'); // i think something is wrong here } }scrollTop = $(this).scrollTop();}); }); function getScrollTop(){ if(typeof pageYOffset!= 'undefined'){ //most browsers return pageYOffset; } else{ var B= document.body; //IE 'quirks' var D= document.documentElement; //IE with doctype D= (D.clientHeight)? D: B; return D.scrollTop; } } </code></pre> <p>my css file is </p> <pre><code>.nav-logo a{ background:url("logo1.png") no-repeat scroll transparent; background-position:-1px 1px;} </code></pre>
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