我想让我的身体在使用鼠标滚轮时停止滚动,而我的网站上的Modal(来自http://twitter.github.com/bootstrap)是打开的。
当模式被打开时,我试图调用下面的javascript片段,但没有成功
$(window).scroll(function() { return false; });
AND
$(window).live('scroll', function() { return false; });
请注意,我们的网站放弃了对IE6的支持,IE7+需要兼容。
我读的大多数答案都是关于React的。
我的React功能组件的最佳解决方案是使用@arcticmatt最初提供的解决方案
我在下面的代码示例中包含了一些在其他答案中提到的改进(注意useEffect定义):
import {useEffect, useRef} from "react";
export default function PopoverMenu({className, handleClose, children}) {
const selfRef = useRef(undefined);
useEffect(() => {
const isPopoverOpenned = selfRef.current?.style.display !== "none";
const focusedElement = document?.activeElement;
const scrollPosition = {x: window.scrollX, y: window.scrollY};
if (isPopoverOpenned) {
preventDocBodyScrolling();
} else {
restoreDocBodyScrolling();
}
function preventDocBodyScrolling() {
const width = document.body.clientWidth;
const hasVerticalScrollBar = (window.innerWidth > document.documentElement.clientWidth);
document.body.style.overflowX = "hidden";
document.body.style.overflowY = hasVerticalScrollBar ? "scroll" : "";
document.body.style.width = `${width}px`;
document.body.style.position = "fixed";
}
function restoreDocBodyScrolling() {
document.body.style.overflowX = "";
document.body.style.overflowY = "";
document.body.style.width = "";
document.body.style.position = "";
focusedElement?.focus();
window.scrollTo(scrollPosition.x, scrollPosition.y);
}
return () => {
restoreDocBodyScrolling(); // cleanup on unmount
};
}, []);
return (
<>
<div
className="backdrop"
onClick={() => handleClose && handleClose()}
/>
<div
className={`pop-over-menu${className ? (` ${className}`) : ""}`}
ref={selfRef}
>
<button
className="pop-over-menu--close-button" type="button"
onClick={() => handleClose && handleClose()}
>
X
</button>
{children}
</div>
</>
);
}
这个解决方案对我很有效:
var scrollDistance = 0;
$(document).on("show.bs.modal", ".modal", function () {
scrollDistance = $(window).scrollTop();
$("body").css("top", scrollDistance * -1);
});
$(document).on("hidden.bs.modal", ".modal", function () {
$("body").css("top", "");
$(window).scrollTop(scrollDistance);
});
.content-area {
height: 750px;
background: grey;
text-align: center;
padding: 25px;
font-weight:700;
font-size: 30px;
}
body.modal-open {
position: fixed;
left: 0;
width: 100%;
}
<link href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.css" rel="stylesheet"/>
<script src="https://code.jquery.com/jquery-3.4.1.slim.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.0/umd/popper.js"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.js"></script>
<div class="content-area">
Scroll Down To Modal Button<br/>
<svg xmlns="http://www.w3.org/2000/svg" width="56" height="56" fill="currentColor" class="bi bi-arrow-down" viewBox="0 0 16 16">
<path fill-rule="evenodd" d="M8 1a.5.5 0 0 1 .5.5v11.793l3.146-3.147a.5.5 0 0 1 .708.708l-4 4a.5.5 0 0 1-.708 0l-4-4a.5.5 0 0 1 .708-.708L7.5 13.293V1.5A.5.5 0 0 1 8 1z"/>
</svg>
</div>
<center class="my-3">
<button type="button" class="btn btn-primary" data-toggle="modal" data-target="#exampleModal">
Launch demo modal
</button>
</center>
<div class="content-area"></div>
<!-- Modal -->
<div class="modal fade" id="exampleModal" tabindex="-1" role="dialog" aria-labelledby="exampleModalLabel" aria-hidden="true">
<div class="modal-dialog" role="document">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title" id="exampleModalLabel">Modal title</h5>
<button type="button" class="close" data-dismiss="modal" aria-label="Close">
<span aria-hidden="true">×</span>
</button>
</div>
<div class="modal-body">
<p>Cras mattis consectetur purus sit amet fermentum. Cras justo odio, dapibus ac facilisis in, egestas eget quam. Morbi leo risus, porta ac consectetur ac, vestibulum at eros.</p>
<p>Praesent commodo cursus magna, vel scelerisque nisl consectetur et. Vivamus sagittis lacus vel augue laoreet rutrum faucibus dolor auctor.</p>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
<button type="button" class="btn btn-primary">Save changes</button>
</div>
</div>
</div>
</div>
基本上,当打开模态时,它会为主体添加一个负顶部,以在打开模态之前保持窗口滚动位置。关闭模态时,窗口滚动保持使用相同的值应用于顶部时,打开。
这种方法可以防止身体滚动。
这是一把能用的小提琴
添加类'is-modal-open'或用javascript修改body标签的样式都是可以的,它会像预期的那样工作。但我们要面对的问题是当body变成overflow:hidden时,它会跳到顶部(scrollTop将变成0)。这将在以后成为一个可用性问题。
作为这个问题的解决方案,而不是改变正文标签溢出:隐藏改变它在html标签
$('#myModal').on('shown.bs.modal', function () {
$('html').css('overflow','hidden');
}).on('hidden.bs.modal', function() {
$('html').css('overflow','auto');
});