我用jQueryMobile为iOS和Android创建了一个网站。
我不希望文档本身滚动。相反，只有一个区域(<div>元素)应该可滚动(通过css属性overflow-y:scroll)。
所以我禁用了文档滚动:
$(document).bind("touchstart", function(e){
e.preventDefault();
});
$(document).bind("touchmove", function(e){
e.preventDefault();
});
但是这也会禁用文档中所有其他元素的滚动，无论overflow:scroll是否设置。
我该如何解决这个问题?
这个CSS only解决方案如何:
https://jsfiddle.net/Volker_E/jwGBy/24/ body得到position: fixed;和你想要的overflow: scroll;。适用于移动Chrome (WebKit)/Firefox 19/Opera 12.
您还将看到我对jQuery解决方案的各种尝试。但是一旦你将touchmove/touchstart绑定到文档，它就会阻碍子div的滚动，无论是否未绑定。
免责声明:这个问题的解决方案在很多方面基本上不是很好的ux明智!您永远不会知道访问者的视口究竟有多大，或者他们使用的是哪种字体大小(像客户端用户代理样式)，因此很容易，重要的内容对他们隐藏在文档中。
也许我误解了这个问题，但如果我是正确的:
你希望除了某个元素之外不能滚动，所以你可以:
$(document).bind("touchmove", function(e){
e.preventDefault();
});
阻止文档中的所有内容。
为什么不直接在你想滚动的元素上停止事件冒泡呢?(PS:你不需要阻止touchstart ->如果你使用touchstart来选择元素而不是阻止点击，触摸移动只需要因为它实际上是跟踪移动)
$('#element').on('touchmove', function (e) {
e.stopPropagation();
});
现在进入元素CSS
#element {
overflow-y: scroll; // (vertical)
overflow-x: hidden; // (horizontal)
}
如果你是在移动设备上，你甚至可以更进一步。你可以强制硬件加速滚动(虽然不是所有的移动浏览器都支持);
Browser Overflow scroll:
Android Browser Yes
Blackberry Browser Yes
Chrome for Mobile Yes
Firefox Mobile Yes
IE Mobile Yes
Opera Mini No
Opera Mobile Kinda
Safari Yes
#element.nativescroll {
-webkit-overflow-scrolling: touch;
}
<div id="element"></div>
原生感觉:
<div id="element" class="nativescroll"></div>
最后，我让它工作了。很简单:
var $layer = $("#layer");
$layer.bind('touchstart', function (ev) {
var $this = $(this);
var layer = $layer.get(0);
if ($this.scrollTop() === 0) $this.scrollTop(1);
var scrollTop = layer.scrollTop;
var scrollHeight = layer.scrollHeight;
var offsetHeight = layer.offsetHeight;
var contentHeight = scrollHeight - offsetHeight;
if (contentHeight == scrollTop) $this.scrollTop(scrollTop-1);
});
这是我正在使用的解决方案:
$scrollElement是滚动元素，$scrollMask是样式为position: fixed; top: 0; bottom: 0;的div。$scrollMask的z-index小于$scrollElement。
$scrollElement.on('touchmove touchstart', function (e) {
e.stopPropagation();
});
$scrollMask.on('touchmove', function(e) {
e.stopPropagation();
e.preventDefault();
});
我正在寻找一个不需要调用应该滚动的特定区域的解决方案。将一些资源拼凑在一起，以下是对我有用的:
// Detects if element has scroll bar
$.fn.hasScrollBar = function() {
return this.get(0).scrollHeight > this.outerHeight();
}
$(document).on("touchstart", function(e) {
var $scroller;
var $target = $(e.target);
// Get which element could have scroll bars
if($target.hasScrollBar()) {
$scroller = $target;
} else {
$scroller = $target
.parents()
.filter(function() {
return $(this).hasScrollBar();
})
.first()
;
}
// Prevent if nothing is scrollable
if(!$scroller.length) {
e.preventDefault();
} else {
var top = $scroller[0].scrollTop;
var totalScroll = $scroller[0].scrollHeight;
var currentScroll = top + $scroller[0].offsetHeight;
// If at container edge, add a pixel to prevent outer scrolling
if(top === 0) {
$scroller[0].scrollTop = 1;
} else if(currentScroll === totalScroll) {
$scroller[0].scrollTop = top - 1;
}
}
});
此代码需要jQuery。
来源:
- 这篇文章
- https://github.com/luster-io/prevent-overscroll
- 如何检查滚动条是否可见? Jquery检查父div是否有滚动条
我需要一个普通的JavaScript版本，所以下面是一个修改的版本。我实现了一个边界检查器和一些明确允许输入/文本区域可点击的东西(我在我使用它的项目上遇到了这个问题……这对于您的项目可能不是必需的)。请记住，这是ES6代码。
const preventScrolling = e => {
const shouldAllowEvent = element => {
// Must be an element that is not the document or body
if(!element || element === document || element === document.body) {
return false;
}
// Allow any input or textfield events
if(['INPUT', 'TEXTAREA'].indexOf(element.tagName) !== -1) {
return true;
}
// Get margin and outerHeight for final check
const styles = window.getComputedStyle(element);
const margin = parseFloat(styles['marginTop']) +
parseFloat(styles['marginBottom']);
const outerHeight = Math.ceil(element.offsetHeight + margin);
return (element.scrollHeight > outerHeight) && (margin >= 0);
};
let target = e.target;
// Get first element to allow event or stop
while(target !== null) {
if(shouldAllowEvent(target)) {
break;
}
target = target.parentNode;
}
// Prevent if no elements
if(!target) {
e.preventDefault();
} else {
const top = target.scrollTop;
const totalScroll = target.scrollHeight;
const currentScroll = top + target.offsetHeight;
// If at container edge, add a pixel to prevent outer scrolling
if(top === 0) {
target.scrollTop = 1;
} else if(currentScroll === totalScroll) {
target.scrollTop = top - 1;
}
}
};
document.addEventListener('touchstart', preventScrolling);
document.addEventListener('mousedown', preventScrolling);
在我的例子中，我有一个可滚动的主体和一个可滚动的浮动菜单。两者都必须是可滚动的，但当"浮动菜单"(位置:固定)收到触摸事件并滚动到顶部或底部时，我必须防止主体滚动。默认情况下，浏览器开始滚动正文。
我真的很喜欢jimmont的答案，但不幸的是，它并不是在所有的设备和浏览器上都能很好地工作，尤其是在快速长时间滑动的情况下。
我最终使用JQUERY (hnldesign.nl)在浮动菜单上使用动量滚动，这可以防止默认的浏览器滚动，然后动画滚动本身。为了完整起见，我在这里包含了这些代码:
/**
* jQuery inertial Scroller v1.5
* (c)2013 hnldesign.nl
* This work is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/4.0/.
**/
/*jslint browser: true*/
/*global $, jQuery*/
/* SETTINGS */
var i_v = {
i_touchlistener : '.inertialScroll', // element to monitor for touches, set to null to use document. Otherwise use quotes. Eg. '.myElement'. Note: if the finger leaves this listener while still touching, movement is stopped.
i_scrollElement : '.inertialScroll', // element (class) to be scrolled on touch movement
i_duration : window.innerHeight * 1.5, // (ms) duration of the inertial scrolling simulation. Devices with larger screens take longer durations (phone vs tablet is around 500ms vs 1500ms). This is a fixed value and does not influence speed and amount of momentum.
i_speedLimit : 1.2, // set maximum speed. Higher values will allow faster scroll (which comes down to a bigger offset for the duration of the momentum scroll) note: touch motion determines actual speed, this is just a limit.
i_handleY : true, // should scroller handle vertical movement on element?
i_handleX : true, // should scroller handle horizontal movement on element?
i_moveThreshold : 100, // (ms) determines if a swipe occurred: time between last updated movement @ touchmove and time @ touchend, if smaller than this value, trigger inertial scrolling
i_offsetThreshold : 30, // (px) determines, together with i_offsetThreshold if a swipe occurred: if calculated offset is above this threshold
i_startThreshold : 5, // (px) how many pixels finger needs to move before a direction (horizontal or vertical) is chosen. This will make the direction detection more accurate, but can introduce a delay when starting the swipe if set too high
i_acceleration : 0.5, // increase the multiplier by this value, each time the user swipes again when still scrolling. The multiplier is used to multiply the offset. Set to 0 to disable.
i_accelerationT : 250 // (ms) time between successive swipes that determines if the multiplier is increased (if lower than this value)
};
/* stop editing here */
//set some required vars
i_v.i_time = {};
i_v.i_elem = null;
i_v.i_elemH = null;
i_v.i_elemW = null;
i_v.multiplier = 1;
// Define easing function. This is based on a quartic 'out' curve. You can generate your own at http://www.timotheegroleau.com/Flash/experiments/easing_function_generator.htm
if ($.easing.hnlinertial === undefined) {
$.easing.hnlinertial = function (x, t, b, c, d) {
"use strict";
var ts = (t /= d) * t, tc = ts * t;
return b + c * (-1 * ts * ts + 4 * tc + -6 * ts + 4 * t);
};
}
$(i_v.i_touchlistener || document)
.on('touchstart touchmove touchend', function (e) {
"use strict";
//prevent default scrolling
e.preventDefault();
//store timeStamp for this event
i_v.i_time[e.type] = e.timeStamp;
})
.on('touchstart', function (e) {
"use strict";
this.tarElem = $(e.target);
this.elemNew = this.tarElem.closest(i_v.i_scrollElement).length > 0 ? this.tarElem.closest(i_v.i_scrollElement) : $(i_v.i_scrollElement).eq(0);
//dupecheck, optimizes code a bit for when the element selected is still the same as last time
this.sameElement = i_v.i_elem ? i_v.i_elem[0] == this.elemNew[0] : false;
//no need to redo these if element is unchanged
if (!this.sameElement) {
//set the element to scroll
i_v.i_elem = this.elemNew;
//get dimensions
i_v.i_elemH = i_v.i_elem.innerHeight();
i_v.i_elemW = i_v.i_elem.innerWidth();
//check element for applicable overflows and reevaluate settings
this.i_scrollableY = !!((i_v.i_elemH < i_v.i_elem.prop('scrollHeight') && i_v.i_handleY));
this.i_scrollableX = !!((i_v.i_elemW < i_v.i_elem.prop('scrollWidth') && i_v.i_handleX));
}
//get coordinates of touch event
this.pageY = e.originalEvent.touches[0].pageY;
this.pageX = e.originalEvent.touches[0].pageX;
if (i_v.i_elem.is(':animated') && (i_v.i_time.touchstart - i_v.i_time.touchend) < i_v.i_accelerationT) {
//user swiped while still animating, increase the multiplier for the offset
i_v.multiplier += i_v.i_acceleration;
} else {
//else reset multiplier
i_v.multiplier = 1;
}
i_v.i_elem
//stop any animations still running on element (this enables 'tap to stop')
.stop(true, false)
//store current scroll positions of element
.data('scrollTop', i_v.i_elem.scrollTop())
.data('scrollLeft', i_v.i_elem.scrollLeft());
})
.on('touchmove', function (e) {
"use strict";
//check if startThreshold is met
this.go = (Math.abs(this.pageX - e.originalEvent.touches[0].pageX) > i_v.i_startThreshold || Math.abs(this.pageY - e.originalEvent.touches[0].pageY) > i_v.i_startThreshold);
})
.on('touchmove touchend', function (e) {
"use strict";
//check if startThreshold is met
if (this.go) {
//set animpar1 to be array
this.animPar1 = {};
//handle events
switch (e.type) {
case 'touchmove':
this.vertical = Math.abs(this.pageX - e.originalEvent.touches[0].pageX) < Math.abs(this.pageY - e.originalEvent.touches[0].pageY); //find out in which direction we are scrolling
this.distance = this.vertical ? this.pageY - e.originalEvent.touches[0].pageY : this.pageX - e.originalEvent.touches[0].pageX; //determine distance between touches
this.acc = Math.abs(this.distance / (i_v.i_time.touchmove - i_v.i_time.touchstart)); //calculate acceleration during movement (crucial)
//determine which property to animate, reset animProp first for when no criteria is matched
this.animProp = null;
if (this.vertical && this.i_scrollableY) { this.animProp = 'scrollTop'; } else if (!this.vertical && this.i_scrollableX) { this.animProp = 'scrollLeft'; }
//set animation parameters
if (this.animProp) { this.animPar1[this.animProp] = i_v.i_elem.data(this.animProp) + this.distance; }
this.animPar2 = { duration: 0 };
break;
case 'touchend':
this.touchTime = i_v.i_time.touchend - i_v.i_time.touchmove; //calculate touchtime: the time between release and last movement
this.i_maxOffset = (this.vertical ? i_v.i_elemH : i_v.i_elemW) * i_v.i_speedLimit; //(re)calculate max offset
//calculate the offset (the extra pixels for the momentum effect
this.offset = Math.pow(this.acc, 2) * (this.vertical ? i_v.i_elemH : i_v.i_elemW);
this.offset = (this.offset > this.i_maxOffset) ? this.i_maxOffset : this.offset;
this.offset = (this.distance < 0) ? -i_v.multiplier * this.offset : i_v.multiplier * this.offset;
//if the touchtime is low enough, the offset is not null and the offset is above the offsetThreshold, (re)set the animation parameters to include momentum
if ((this.touchTime < i_v.i_moveThreshold) && this.offset !== 0 && Math.abs(this.offset) > (i_v.i_offsetThreshold)) {
if (this.animProp) { this.animPar1[this.animProp] = i_v.i_elem.data(this.animProp) + this.distance + this.offset; }
this.animPar2 = { duration: i_v.i_duration, easing : 'hnlinertial', complete: function () {
//reset multiplier
i_v.multiplier = 1;
}};
}
break;
}
// run the animation on the element
if ((this.i_scrollableY || this.i_scrollableX) && this.animProp) {
i_v.i_elem.stop(true, false).animate(this.animPar1, this.animPar2);
}
}
});
另一个观察:我还尝试了菜单div上的e.p stoppropagation()和touchmove事件上的窗口/主体上的e.p preventdefault()的各种组合，但没有成功，我只设法阻止我想要的滚动，而不是我不想要的滚动。我还尝试在整个文档上有一个div，在文档和菜单之间有z-index，仅在touchstart和touchend之间可见，但它没有接收touchmove事件(因为它在菜单div下)。
这是一个使用jQuery处理事件的解决方案。
var stuff = {};
$('#scroller').on('touchstart',stuff,function(e){
e.data.max = this.scrollHeight - this.offsetHeight;
e.data.y = e.originalEvent.pageY;
}).on('touchmove',stuff,function(e){
var dy = e.data.y - e.originalEvent.pageY;
// if scrolling up and at the top, or down and at the bottom
if((dy < 0 && this.scrollTop < 1)||(dy > 0 && this.scrollTop >= e.data.max)){
e.preventDefault();
};
});
首先将innerscroll定位在屏幕上的任何位置，然后通过将其css设置为'hidden'来固定outerscroll。当你想恢复它时，你可以将它设置回"自动"或"滚动"，无论你以前使用的。
这是我在触摸设备和笔记本电脑上的实现。
function ScrollManager() {
let startYCoord;
function getScrollDiff(event) {
let delta = 0;
switch (event.type) {
case 'mousewheel':
delta = event.wheelDelta ? event.wheelDelta : -1 * event.deltaY;
break;
case 'touchstart':
startYCoord = event.touches[0].clientY;
break;
case 'touchmove': {
const yCoord = event.touches[0].clientY;
delta = yCoord - startYCoord;
startYCoord = yCoord;
break;
}
}
return delta;
}
function getScrollDirection(event) {
return getScrollDiff(event) >= 0 ? 'UP' : 'DOWN';
}
function blockScrollOutside(targetElement, event) {
const { target } = event;
const isScrollAllowed = targetElement.contains(target);
const isTouchStart = event.type === 'touchstart';
let doScrollBlock = !isTouchStart;
if (isScrollAllowed) {
const isScrollingUp = getScrollDirection(event) === 'UP';
const elementHeight = targetElement.scrollHeight - targetElement.offsetHeight;
doScrollBlock =
doScrollBlock &&
((isScrollingUp && targetElement.scrollTop <= 0) ||
(!isScrollingUp && targetElement.scrollTop >= elementHeight));
}
if (doScrollBlock) {
event.preventDefault();
}
}
return {
blockScrollOutside,
getScrollDirection,
};
}
const scrollManager = ScrollManager();
const testBlock = document.body.querySelector('.test');
function handleScroll(event) {
scrollManager.blockScrollOutside(testBlock, event);
}
window.addEventListener('scroll', handleScroll);
window.addEventListener('mousewheel', handleScroll);
window.addEventListener('touchstart', handleScroll);
window.addEventListener('touchmove', handleScroll);.main {
border: 1px solid red;
height: 200vh;
}
.test {
border: 1px solid green;
height: 300px;
width: 300px;
overflow-y: auto;
position: absolute;
top: 100px;
left: 50%;
}
.content {
height: 100vh;
}<div class="main">
<div class="test">
<div class="content"></div>
</div>
</div>这是我在Android和IOS设备上使用的方法。
假设我们有一个div class="backdrop">元素，我们不想滚动它。但是我们希望能够滚动到backdrop顶部的元素。
function handleTouchMove(event) {
const [backdrop] = document.getElementsByClassName('backdrop');
const isScrollingBackdrop = backdrop === event.target;
isScrollingBackdrop ? event.preventDefault() : event.stopPropagation();
}
window.addEventListener('touchmove', handleTouchMove, { passive: false });
所以，我们听touchmove事件，如果我们在背景上滚动，我们阻止它。如果我们滚动到其他东西上，我们允许它，但是停止它的传播所以它也不会滚动backdrop。
当然，这是非常基本的，可以重新工作和扩展很多，但这是解决我在VueJs2项目中的问题。
希望有帮助!)
我可以通过在HTML中添加css "overflow-y: hidden"来禁用主文档的滚动。