[英]Cycle through different sized images on scroll
我正在尝试在滚动时更改图像(并且我知道jquery可能有点杂乱,但似乎可以正常工作),但我想:
才能拥有不同高度和宽度的图像,而不是所有相同大小的图像(现在)。
垂直/水平居中。
这是一个小提琴: https : //jsfiddle.net/postcolonialboy/WTkqn/486/
谢谢!
HTML:
<div id="contentwrapper">
<div class="centreme">
<img src="https://picsum.photos/200/200?image=1" id="animation" />
<img class="hidden" src="https://picsum.photos/200/200?image=1" />
<img class="hidden" src="https://picsum.photos/200/200?image=2" />
<img class="hidden" src="https://picsum.photos/200/200?image=3" />
<img class="hidden" src="https://picsum.photos/200/200?image=4" />
<img class="hidden" src="https://picsum.photos/200/200?image=5" />
<div id="bottommark"></div>
</div>
</div>
CSS:
body,
html {
height: 7000px;
margin: 0;
background-color: grey;
}
.hidden {
position: absolute;
top: -9999999px
}
#bottommark {
position: absolute;
bottom: 0;
}
#contentwrapper {
width: 100%;
height: 100%;
position: fixed;
}
.centreme {
position: fixed;
width: 200px;
/* the image width */
height: 200px;
/* the image height */
top: 50%;
left: 50%;
margin-top: -100px;
/* half the image height */
margin-left: -100px;
/* half the image width */
}
JS:
$(document).ready(function() {
var a = $(document).height();
var b = a - $("#bottommark").position().top;
$(window).scroll(function() {
var e = $(document).height();
var f = $(window).scrollTop();
var c = e - $("#bottommark").position().top - f;
var d = b / 5;
$("span").html(c);
if (c > d * 4) {
$("#animation").attr("src", "https://picsum.photos/200/200?image=1")
}
if ((c < d * 4) && (c > d * 3)) {
$("#animation").attr("src", "https://picsum.photos/200/200?image=2")
}
if ((c < d * 3) && (c > d * 2)) {
$("#animation").attr("src", "https://picsum.photos/200/200?image=3")
}
if (c < d * 2 && c > d * 1) {
$("#animation").attr("src", "https://picsum.photos/200/200?image=4")
}
if (c < d) {
$("#animation").attr("src", "https://picsum.photos/200/200?image=5")
}
})
});
我认为用更少的代码会更好。
现在您可以拥有任意数量的图像而无需更改js和css部分
$(function() { var win = $(window), images = $(".images > div"), img = $(".img > img"); img.attr('src', images.eq(0).data('img')); win.on('scroll', function(event) { var st = win.scrollTop(), num1 = $(document).height() / images.length, num = Math.round(st / num1); img.attr('src', images.eq(num).data('img')); }); });
body, html { height: 8000px; margin: 0; background-color: grey; } .img { position: fixed; top: 50%; left: 50%; transform: translate(-50%, -50%); }
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <div class="images"> <div data-img="https://picsum.photos/300/200?image=1"></div> <div data-img="https://picsum.photos/400/300?image=2"></div> <div data-img="https://picsum.photos/200/200?image=3"></div> <div data-img="https://picsum.photos/300/400?image=4"></div> <div data-img="https://picsum.photos/500/300?image=5"></div> </div> <div class="img"><img></div>
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