Change image on scroll

Question

On my website is a fixed image. This image should be "animated", meaning that the single frames of the animation should be iterated. So the idea is to have an array of images and that every time the user scrolls, the array is iterated and the displayed image changes, thus creating an animation. I'm not that accustomed to using JS, thus I don't really know where to start. The only thing I have is the CSS:

#animation { 
background-repeat: no-repeat;
position : fixed; 
width: 980px;
margin: 0 auto;
}

Have you looked into JQuery parallax scrollers? You can do a lot with them http://ianlunn.co.uk/plugins/jquery-parallax/ http://stephband.info/jparallax/demos/index.html — Adam Brown, Apr 07 '13 at 12:03

score 7 · Accepted Answer · answered Apr 07 '13 at 14:07

Ok, I've created example for fixed number of images that will be used in "movie/animation". In this case, the number is 5. Script will get image of site's height and whole animation (5 frames) will have lenght of site's lenght. I've preloaded and hide images that will be used in animation just to make sure that animation will work smooth.

HTML

<img class="hidden" src="http://coverjunction.s3.amazonaws.com/manual/low/colorful1.jpg"/>
<img class="hidden" src="http://coverjunction.s3.amazonaws.com/manual/low/colorful2.jpg"/>
<img class="hidden" src="http://coverjunction.s3.amazonaws.com/manual/low/colorful3.jpg"/>
<img class="hidden" src="http://coverjunction.s3.amazonaws.com/manual/low/colorful4.jpg"/>
<img class="hidden" src="http://coverjunction.s3.amazonaws.com/manual/low/colorful5.jpg"/>

<!-- Next image is used for first frame, before scroll -->
<img src="http://coverjunction.s3.amazonaws.com/manual/low/colorful1.jpg" id="animation" />

<div id="bottommark"></div>

CSS

.hidden {
    position: absolute;
    top: -9999999px;
}

#bottommark {
    position: absolute;
    bottom: 0;
}

#animation { 
    background-repeat: no-repeat;
    position : fixed; 
    top: 0;
    width: 980px;
    margin: 0 auto;
}

body, html {
    height: 1000px; /* just for DEMO */
    margin: 0;
}

jQuery

$(document).ready(function(){
    var offset2 = $(document).height();
   var lineHF = offset2 - $("#bottommark").position().top;
    $(window).scroll(function(){
        var offset1 = $(document).height();
        var offset = $(window).scrollTop();
        var lineH = offset1 - $("#bottommark").position().top - offset;
        var lineHpart = lineHF/5; //just in case animation have 5 frames/images

        //below is code in case that animation have 5 frames.
        //If number of frames is different, edit code (add/remove if loops) 

        $("span").html(lineH);
            if (lineH > lineHpart*4) {
                $("#animation").attr("src", "http://coverjunction.s3.amazonaws.com/manual/low/colorful1.jpg");
            }
            if ((lineH < lineHpart*4) && (lineH > lineHpart*3)) {
                $("#animation").attr("src", "http://coverjunction.s3.amazonaws.com/manual/low/colorful2.jpg");
            }
            if ((lineH < lineHpart*3) && (lineH > lineHpart*2)) {
                $("#animation").attr("src", "http://coverjunction.s3.amazonaws.com/manual/low/colorful3.jpg");
            }
            if (lineH < lineHpart*2 && lineH > lineHpart*1) {
                $("#animation").attr("src", "http://coverjunction.s3.amazonaws.com/manual/low/colorful4.jpg");
            }
            if (lineH < lineHpart) {
                $("#animation").attr("src", "http://coverjunction.s3.amazonaws.com/manual/low/colorful5.jpg");
            }
        });
    });

DEMO

Now that answers my question, thank you :) But I am afraid, I did not express myself correctly: I want the animation to loop. Now I could just copy paste the entire thing and add my frames over and over again, but that looks kind of stupid to me... So how would I loop your script? — pudelhund, Apr 11 '13 at 19:32
Someone opened a separate thread for my question [here](http://stackoverflow.com/questions/18080809/image-change-on-scroll?lq=1) (including answer). — pudelhund, Aug 28 '14 at 12:10
Can i did this?fadeIn(500) $("#animation").fadeIn(500).attr("src", "http://coverjunction.s3.amazonaws.com/manual/low/colorful5.jpg"); — DK Thakur, Apr 29 '22 at 09:45

Change image on scroll

1 Answers1

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