javascript 防止整页滚动 iOS
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原文地址: http://stackoverflow.com/questions/16889447/
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prevent full page scrolling iOS
提问by Aaron Yodaiken
Under Mobile Safari, is it possible to allow one absolutely positioned divto scroll without allowing the entire page to bob up and down when it the scroll reaches the edges (elastically scrolling)?
在 Mobile Safari 下，是否可以div在滚动到达边缘时允许一个绝对定位的滚动而不允许整个页面上下摆动（弹性滚动）？
Here is a minimal working example of the issue I'm facing:
这是我面临的问题的最小工作示例：
<!doctype html>
<html>
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no">
<meta name="apple-mobile-web-app-capable" content="yes" />
<style>
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
#a, #b {
position: absolute;
top: 0;
left: 0;
height: 100%;
padding: 10px;
overflow: auto;
}
#a {
width: 80px;
background: #f00;
}
#b {
background: #00f;
left: 80px;
width: 100%;
}
</style>
<script src="http://code.jquery.com/jquery-1.10.1.min.js"></script>
<script>
function pdcb(e) {
e.preventDefault();
}
function npcb(e) {
e.stopPropagation();
}
$(document).on('touchstart touchmove', pdcb).
on('touchstart touchmove', '.scrollable', npcb);
</script>
</head>
<body>
<div id="a" class="scrollable">
This<br>
should<br>
be<br>
scrollable<br>
but<br>
not<br>
scroll<br>
the<br>
whole<br>
page<br>
This<br>
should<br>
be<br>
scrollable<br>
but<br>
not<br>
scroll<br>
the<br>
whole<br>
page<br>
This<br>
should<br>
be<br>
scrollable<br>
but<br>
not<br>
scroll<br>
the<br>
whole<br>
page<br>
This<br>
should<br>
be<br>
scrollable<br>
but<br>
not<br>
scroll<br>
the<br>
whole<br>
page<br>
This<br>
should<br>
be<br>
scrollable<br>
but<br>
not<br>
scroll<br>
the<br>
whole<br>
page<br>
</div>
<div id="b">
this should never scroll
</div>
</body>
</html>
Solution:
解决方案：
$(document).on('touchmove', function(e) {
e.preventDefault();
}).ready(function() {
$(".scrollable").on('touchstart', function(e) {
this.allowUp = (this.scrollTop > 0);
this.allowDown = (this.scrollTop < this.scrollHeight - this.clientHeight);
this.prevTop = null;
this.prevBot = null;
this.lastY = e.originalEvent.pageY;
}).on('touchmove', function(e) {
var event = e.originalEvent;
var up = (event.pageY > this.lastY), down = !up;
this.lastY = event.pageY;
if ((up && this.allowUp) || (down && this.allowDown))
event.stopPropagation();
else
event.preventDefault();
});
});
采纳答案by 1nfiniti
While you're not hitting the edges of your div's content, you need to allow the native touchmove event to work on that element (so it can scroll), but you're going to want to stop the event from bubbling up the DOM so that it doesn't trigger scrolling on the page body.
虽然您没有触及 div 内容的边缘，但您需要允许本机 touchmove 事件处理该元素（以便它可以滚动），但您将希望阻止该事件冒泡 DOM，因此它不会触发页面 body 上的滚动。
When you hit the boundary of your element, you need to prevent the native momentum scrolling entirely.
当您到达元素的边界时，您需要完全阻止原生动量滚动。
The code I use for this is as follows (apologies to the original author, this is adapted from a tutorial on this topic I found somewhere on the internet in the past... Can't seem to find the URL now though):
我为此使用的代码如下（向原作者道歉，这是改编自我过去在互联网上某处找到的有关此主题的教程......虽然现在似乎找不到 URL）：
where elem is your DOM node
其中 elem 是您的 DOM 节点
elem.addEventListener('touchstart', function(event){
this.allowUp = (this.scrollTop > 0);
this.allowDown = (this.scrollTop < this.scrollHeight - this.clientHeight);
this.prevTop = null; this.prevBot = null;
this.lastY = event.pageY;
});
elem.addEventListener('touchmove', function(event){
var up = (event.pageY > this.lastY), down = !up;
this.lastY = event.pageY;
if ((up && this.allowUp) || (down && this.allowDown)) event.stopPropagation();
else event.preventDefault();
});
I usually define an array of elements and loop through them - applying this code to each one iteratively.
我通常定义一个元素数组并遍历它们 - 将此代码迭代地应用于每个元素。
Best of luck, hope this helps.
祝你好运，希望这会有所帮助。
回答by micho
The original answers are fantastic, but have a few flaws that I resolved:
原始答案很棒，但我解决了一些缺陷：
- If an element is at the top or the bottom, it won't scroll up and down respectively.
- If an element is added dynamically, it won't have the scroll handlers.
- There were unused variables (prevTop, prevBot)
- 如果一个元素在顶部或底部，它不会分别向上和向下滚动。
- 如果一个元素是动态添加的，它将没有滚动处理程序。
- 有未使用的变量（prevTop、prevBot）
My answer addresses those. (Notice that I use .scroll-y, instead of .scrollable)
我的回答解决了这些问题。（请注意，我使用.scroll-y, 而不是.scrollable）
First, add these CSS rules:
首先，添加这些 CSS 规则：
.scroll-y {
overflow-y: auto;
overflow-x: hidden;
-webkit-overflow-scrolling: touch; /* nice webkit native scroll */
}
Add the .scroll-yclass to any elements you want to make scroll.
将该.scroll-y类添加到要滚动的任何元素。
Then, add this JS somewhere:
然后，在某处添加这个 JS：
// Disable scroll for the document, we'll handle it ourselves
$(document).on('touchmove', function(e) {
e.preventDefault();
});
// Check if we should allow scrolling up or down
$(document.body).on("touchstart", ".scroll-y", function (e) {
// If the element is scrollable (content overflows), then...
if (this.scrollHeight !== this.clientHeight) {
// If we're at the top, scroll down one pixel to allow scrolling up
if (this.scrollTop === 0) {
this.scrollTop = 1;
}
// If we're at the bottom, scroll up one pixel to allow scrolling down
if (this.scrollTop === this.scrollHeight - this.clientHeight) {
this.scrollTop = this.scrollHeight - this.clientHeight - 1;
}
}
// Check if we can scroll
this.allowUp = this.scrollTop > 0;
this.allowDown = this.scrollTop < (this.scrollHeight - this.clientHeight);
this.lastY = e.originalEvent.pageY;
});
$(document.body).on('touchmove', ".scroll-y", function(e) {
var event = e.originalEvent;
var up = event.pageY > this.lastY;
var down = !up;
this.lastY = event.pageY;
if ((up && this.allowUp) || (down && this.allowDown)) {
event.stopPropagation();
} else {
event.preventDefault();
}
});
回答by user4533280
The note provided by Aaron Grey helped!
Aaron Gray 提供的说明很有帮助！
See link: http://blog.christoffer.me/six-things-i-learnt-about-ios-safaris-rubber-band-scrolling/
见链接：http: //blog.christoffer.me/six-things-i-learnt-about-ios-safaris-rubber-band-scrolling/
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="minimum-scale=1.0, width=device-width, maximum-scale=1.0, user-scalable=no, initial-scale=1">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<style>
.page{
font-size: 24px;
overflow: scroll;
}
.menu{
position: fixed;
top: 0;
bottom: 0;
left: 0;
width: 80%;
background: gray;
z-index: 1;
font-size: 10px;
overflow: scroll;
/* uncomment to get smooth momentum scroll, but also a rubber band effect */
/*-webkit-overflow-scrolling: touch;*/
}
.menu-item{
padding: 10px;
background: darkgray;
font-size: 24px;
}
</style>
</head>
<body>
<div class="menu scrollable">
<div class="menu-item">hello world</div>
<div class="menu-item">hello world</div>
<div class="menu-item">hello world</div>
<div class="menu-item">hello world</div>
<div class="menu-item">hello world</div>
<div class="menu-item">hello world</div>
<div class="menu-item">hello world</div>
<div class="menu-item">hello world</div>
<div class="menu-item">hello world</div>
<div class="menu-item">hello world</div>
<div class="menu-item">hello world</div>
<div class="menu-item">hello world</div>
<div class="menu-item">hello world</div>
<div class="menu-item">hello world</div>
<div class="menu-item">hello world</div>
<div class="menu-item">hello world</div>
<div class="menu-item">hello world</div>
<div class="menu-item">hello world</div>
</div>
<div class="page disable-scrolling">
Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's
standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make
a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting,
remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing
Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions
of Lorem Ipsum.
</div>
<script>
document.ontouchmove = function ( event ) {
var isTouchMoveAllowed = true, target = event.target;
while ( target !== null ) {
if ( target.classList && target.classList.contains( 'disable-scrolling' ) ) {
isTouchMoveAllowed = false;
break;
}
target = target.parentNode;
}
if ( !isTouchMoveAllowed ) {
event.preventDefault();
}
};
function removeIOSRubberEffect( element ) {
element.addEventListener( "touchstart", function () {
var top = element.scrollTop, totalScroll = element.scrollHeight, currentScroll = top + element.offsetHeight;
if ( top === 0 ) {
element.scrollTop = 1;
} else if ( currentScroll === totalScroll ) {
element.scrollTop = top - 1;
}
} );
}
removeIOSRubberEffect( document.querySelector( ".scrollable" ) );
</script>
</body>
</html>
