webScroll/6_5_scroll_change_img_array.html at main · p4css/webScroll · GitHub

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<!DOCTYPE html>
<html lang="en">

<head>
    <!-- Required meta tags -->
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

    <!-- Bootstrap CSS -->
    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" integrity="sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" crossorigin="anonymous">

    <meta charset="utf-8">
    <style>
        body {
            height: 6400px;
            margin: 0;
        }

        #animation {
            position: fixed;
            top: 0;
            left: 50%;
            transform: translate(-50%, 0%);
            height: 100%;
/*            margin: 0 auto;*/
        }
    </style>
</head>


<body>
    <div class="container-fluid">
        <img id="animation" src="assets/snoopy6.jpg" />
    </div>

    <script src="https://code.jquery.com/jquery-3.3.1.js" integrity="sha256-2Kok7MbOyxpgUVvAk/HJ2jigOSYS2auK4Pfzbm7uH60=" crossorigin="anonymous"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js" integrity="sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvCWPIPm49" crossorigin="anonymous"></script>
    <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js" integrity="sha384-ChfqqxuZUCnJSK3+MXmPNIyE6ZbWh2IMqE241rYiqJxyMiZ6OW/JmZQ5stwEULTy" crossorigin="anonymous"></script>
    <script>
        $(function() {
            var doch = $(document).height();
            var winh = $(window).height();
            console.log("doch/winh: " + doch + "/" + winh);
            var nimgs = 8;
            var scrollheight = (doch - winh) / nimgs;
            var arr = [];
            var srcs = [];
            for (var i = 0; i < nimgs; i++) {
                arr.push((i + 1) * scrollheight);
                srcs.push("assets/snoopy" + (i + 1) + ".jpg");
            }
            console.log(arr);

            $(window).scroll(function() {
                var scroll_position = $(document).scrollTop();
                for (i = 0; i < arr.length - 1; i++) {
                    if (arr[i] < scroll_position && arr[i + 1] > scroll_position) {
                        console.log(srcs[i]);
                        $('#animation').attr("src", srcs[i]);
                    }
                }

            });
        });
    </script>
</body>

</html>