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    <p>Ive made the script but also included some changes. In your code, you would append multiple classes 'tiny' since the event gets trigged by every scrollmovement. Ive just added a class and I first check if this class has been set. If it has not been set, then I will change the color on the scroll. If you remove the 'check', the color would change every scrollmovement, which can be very cool if you aint epileptic :)</p> <pre><code> // array with the colors, you can add the colors here. var colors = ["red", "blue", "yellow", "black", "green"]; $(window).scroll(function () { if ($(document).scrollTop() == 0) { //if scrollbar is at the top (doing nothing atm) } else if($( "#header_nav" ).hasClass( "colorSet" )) { //if the colorSet class has been apended (remove this, if you want some fun :)) } else { //first, add the class, so we know we do not have to walk tru this anymore. $('#header_nav').addClass('colorSet'); // Apend a CSS background-color based on a rand function on our color array $('#header_nav').css( "background-color", colors[Math.floor(Math.random() * colors.length)] ); } }); </code></pre> <p>Now if you want, you can alter the first if statement (scrollTop() ). If you remove the colorSet class here, you will get a new random color if someone scrolls down -> top -> down again.</p> <p>For multiple classes with random colors;</p> <pre><code> // array with the colors, you can add the colors here. var colors = ["red", "blue", "yellow", "black", "green"]; $(window).scroll(function () { if ($(document).scrollTop() == 0) { //if scrollbar is at the top (doing nothing atm) } else if($( "#header_nav" ).hasClass( "colorSet" )) { //if the colorSet class has been apended (remove this, if you want some fun :)) } else { //first, add the class, so we know we do not have to walk tru this anymore. $('#header_nav').addClass('colorSet'); // Apend a CSS background-color based on a rand function on our color array $('#header_nav').css( "background-color", colors[Math.floor(Math.random() * colors.length)] ); $('.header').css( "background-color", colors[Math.floor(Math.random() * colors.length)] ); $('.header.tiny').css( "background-color", colors[Math.floor(Math.random() * colors.length)] ); } }); </code></pre> <p>And for multiple classes who share the same color;</p> <pre><code>// array with the colors, you can add the colors here. var colors = ["red", "blue", "yellow", "black", "green"]; $(window).scroll(function () { if ($(document).scrollTop() == 0) { //if scrollbar is at the top (doing nothing atm) } else if($( "#header_nav" ).hasClass( "colorSet" )) { //if the colorSet class has been apended (remove this, if you want some fun :)) } else { //first, add the class, so we know we do not have to walk tru this anymore. $('#header_nav').addClass('colorSet'); var color = colors[Math.floor(Math.random() * colors.length)]; // Apend a CSS background-color based on a rand function on our color array $('#header_nav').css( "background-color", color ); $('.header').css( "background-color", color ); $('.header.tiny').css( "background-color", color ); } }); </code></pre>
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    1. PORandom color in jQuery
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    1. COThank you for your help, but i have a little problem here. I need to play with multiple classes, because it handles the size of the header: `.header { width:100%; height:124px; color: #fff; position:fixed; top:0; left:0; transition: height 500ms, background 500ms; z-index:100;-webkit-box-shadow: 0px 2px 3px 0px rgba(0, 0, 0, 0.2); box-shadow: 0px 2px 3px 0px rgba(0, 0, 0, 0.2); } .header.tiny { height:70px; background: #aaa; }` But if you can integrate these in jquery too, well, that would be epic :)
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    2. COUpdated the code. It should be pretty easy to adjust some parts. You now see how to add a class/id to the script.
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