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    <p>How about this, see <a href="http://jsfiddle.net/MW8N3/" rel="nofollow"><strong>JSFiddle</strong></a> (explained below):</p> <pre><code>var height_colors = [ [0, "#FFF"], [50, "#FFFF00"], [100, "#FF0000"], [150, "#FF00FF"], [200, "#00FF00"], [250, "#0000FF"], [300, "#00FFFF"], [350, "#123456"], [400, "#654321"], [450, "ABCDEF"], [500, "FEDCBA"] ]; var box = $("#lipsum"); box.on("scroll", function () { var scrollPos = $(this).scrollTop(); $.each(height_colors, function(key, value) { if(scrollPos &lt; value[0] || key == height_colors.length - 1) { box.css("background", value[1]); return false; } }); }); </code></pre> <p>Given a scrollable div <code>#lipsum</code>, and an Array of <code>[&lt;height&gt;, &lt;color&gt;]</code> values, when we scroll our element, we check it's <code>scrollTop()</code> value, and iterate over our array until we find a <code>height</code> value which is lower than the current <code>scrollTop()</code>. </p> <p>Now, this could be transformed in a number of ways. For example, rather than calculate the position of a scrollable div, you could calculate the scroll position relative to the <code>document</code>, and then replace your <code>height_colors</code> array, to be an array of elements, and colors to iterate over. You'd do very much the same thing, but calculate the <code>offset</code> of the iterated elements until you've got an element with an <code>offset</code> greater than the current <code>scrollTop</code>.</p> <p>Your new Array could look like:</p> <pre><code>var height_colors = [ ["#elem-a", "#FFF"], ["#elem-b", "#555"], ... ] </code></pre> <p>It might be better in this case to keep a track of the last checked element so that you use the "one before last" once you realise you've gone too far. (not checked this code)</p> <pre><code> // Assign a default color for scroll positions before your first element var last_color = "#FFF"; $.each(height_colors, function(key, value) { var current = $(value[0]); if(scrollPos &lt; current.offset().top) { $("body").css("background", last_color); } last_color = value[1]; }); </code></pre> <p>The link you provided seems to do something similar, and as someone pointed out, you could use the jQuery UI variant of <code>.animate()</code> to fade between colours (though in my example with only 50 pixel stops, a 200ms animation was far too long).</p>
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    1. POHow to make background colour fade in when div is scrolled down
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