我有一个小的“浮动工具箱”-一个div的位置:fixed;溢出:汽车。 工作得很好。

但是当滚动到盒子里面(用鼠标滚轮)并到达底部或顶部时,父元素“接管”“滚动请求”:工具箱后面的文档滚动。 -这是恼人的,而不是用户“要求”。

我正在使用jQuery,并认为我可以用event.stoppropagation()停止这种行为: $(" #工具箱”)。Scroll (function(event){event.stoppropagation()});

它确实进入了函数,但传播仍然发生(文档滚动) 在SO(和谷歌)上搜索这个话题是非常困难的,所以我不得不问: 如何防止滚动事件的传播/冒泡?

编辑: 工作解决方案感谢amustill(和Brandon Aaron的鼠标轮插件在这里: https://github.com/brandonaaron/jquery-mousewheel/raw/master/jquery.mousewheel.js

$(".ToolPage").bind('mousewheel', function(e, d)  
    var t = $(this);
    if (d > 0 && t.scrollTop() === 0) {
        e.preventDefault();
    }
    else {
        if (d < 0 && (t.scrollTop() == t.get(0).scrollHeight - t.innerHeight())) {
            e.preventDefault();
        }
    }
});

当前回答

我在MooTools上搜索这个,这是第一个出现的。 最初的MooTools示例可以用于向上滚动,但不能用于向下滚动,因此我决定编写这个示例。

MooTools 1.4.5: http://jsfiddle.net/3MzFJ/ MooTools 1.3.2: http://jsfiddle.net/VhnD4/ MooTools 1.2.6: http://jsfiddle.net/xWrw4/


var stopScroll = function (e) {
    var scrollTo = null;
    if (e.event.type === 'mousewheel') {
        scrollTo = (e.event.wheelDelta * -1);
    } else if (e.event.type === 'DOMMouseScroll') {
        scrollTo = 40 * e.event.detail;
    }
    if (scrollTo) {
        e.preventDefault();
        this.scrollTo(0, scrollTo + this.scrollTop);
    }
    return false;
};

用法:

(function)($){
    window.addEvent('domready', function(){
        $$('.scrollable').addEvents({
             'mousewheel': stopScroll,
             'DOMMouseScroll': stopScroll
        });
    });
})(document.id);

其他回答

我能找到的最佳解决方案是监听窗口上的滚动事件,并在子div可见时将scrollTop设置为前一个scrollTop。

prevScrollPos = 0
$(window).scroll (ev) ->
    if $('#mydiv').is(':visible')
        document.body.scrollTop = prevScrollPos
    else
        prevScrollPos = document.body.scrollTop

如果触发大量滚动事件,子div的背景中会有闪烁,所以这可以进行调整,但它几乎不会被注意到,对于我的用例来说已经足够了。

有es6跨浏览器+移动香草js决定:

function stopParentScroll(selector) {
    let last_touch;
    let MouseWheelHandler = (e, selector) => {
        let delta;
        if(e.deltaY)
            delta = e.deltaY;
        else if(e.wheelDelta)
            delta = e.wheelDelta;
        else if(e.changedTouches){
            if(!last_touch){
                last_touch = e.changedTouches[0].clientY;
            }
            else{
                if(e.changedTouches[0].clientY > last_touch){
                    delta = -1;
                }
                else{
                    delta = 1;
                }
            }
        }
        let prevent = function() {
            e.stopPropagation();
            e.preventDefault();
            e.returnValue = false;
            return false;
        };

        if(selector.scrollTop === 0 && delta < 0){
            return prevent();
        }
        else if(selector.scrollTop === (selector.scrollHeight - selector.clientHeight) && delta > 0){
            return prevent();
        }
    };

    selector.onwheel = e => {MouseWheelHandler(e, selector)}; 
    selector.onmousewheel = e => {MouseWheelHandler(e, selector)}; 
    selector.ontouchmove  = e => {MouseWheelHandler(e, selector)};
}

有很多这样的问题,有很多答案,但我找不到一个不涉及事件、脚本、插件等的令人满意的解决方案。我想在HTML和CSS中保持它的直。我最终找到了一个可行的解决方案,尽管它涉及到重新构造标记以中断事件链。


1. 基本问题

应用于模态元素的滚动输入(例如:鼠标滚轮)将溢出到一个祖先元素中,并以相同的方向滚动它,如果某些这样的元素是可滚动的:

(所有示例都是在桌面分辨率下查看的)

https://jsfiddle.net/ybkbg26c/5/

HTML:

<div id="parent">
  <div id="modal">
    This text is pretty long here.  Hope fully, we will get some scroll bars.
  </div>
</div>

CSS:

#modal {
  position: absolute;
  height: 100px;
  width: 100px;
  top: 20%;
  left: 20%;
  overflow-y: scroll;
}
#parent {
  height: 4000px;
}

2. 模态滚动上没有父滚动

The reason why the ancestor ends up scrolling is because the scroll event bubbles and some element on the chain is able to handle it. A way to stop that is to make sure none of the elements on the chain know how to handle the scroll. In terms of our example, we can refactor the tree to move the modal out of the parent element. For obscure reasons, it is not enough to keep the parent and the modal DOM siblings; the parent must be wrapped by another element that establishes a new stacking context. An absolutely positioned wrapper around the parent can do the trick.

我们得到的结果是,只要模态接收到滚动事件,事件就不会冒泡到“父”元素。

通常应该可以重新设计DOM树来支持这种行为,而不影响最终用户所看到的内容。

https://jsfiddle.net/0bqq31Lv/3/

HTML:

<div id="context">
  <div id="parent">
  </div>
</div>
<div id="modal">
  This text is pretty long here.  Hope fully, we will get some scroll bars.
</div>

CSS(仅新):

#context {
  position: absolute;
  overflow-y: scroll;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
}

3.没有滚动的任何地方,除了在模式,而它是

The solution above still allows the parent to receive scroll events, as long as they are not intercepted by the modal window (i.e. if triggered by mousewheel while the cursor is not over the modal). This is sometimes undesirable and we may want to forbid all background scrolling while the modal is up. To do that, we need to insert an extra stacking context that spans the whole viewport behind the modal. We can do that by displaying an absolutely positioned overlay, which can be fully transparent if necessary (but not visibility:hidden).

https://jsfiddle.net/0bqq31Lv/2/

HTML:

<div id="context">
  <div id="parent">
  </div>
</div>
<div id="overlay">  
</div>
<div id="modal">
  This text is pretty long here.  Hope fully, we will get some scroll bars.
</div>

CSS(在#2的顶部新增):

#overlay {
  background-color: transparent;
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
}

Amustill的回答是:

ko.bindingHandlers.preventParentScroll = {
    init: function (element, valueAccessor, allBindingsAccessor, context) {
        $(element).mousewheel(function (e, d) {
            var t = $(this);
            if (d > 0 && t.scrollTop() === 0) {
                e.preventDefault();
            }
            else {
                if (d < 0 && (t.scrollTop() == t.get(0).scrollHeight - t.innerHeight())) {
                    e.preventDefault();
                }
            }
        });
    }
};

新的web开发人员在这里。这对我来说在IE和Chrome浏览器上都很有吸引力。

static preventScrollPropagation(e: HTMLElement) {
    e.onmousewheel = (ev) => {
        var preventScroll = false;
        var isScrollingDown = ev.wheelDelta < 0;
        if (isScrollingDown) {
            var isAtBottom = e.scrollTop + e.clientHeight == e.scrollHeight;
            if (isAtBottom) {
                preventScroll = true;
            }
        } else {
            var isAtTop = e.scrollTop == 0;
            if (isAtTop) {
                preventScroll = true;
            }
        }
        if (preventScroll) {
            ev.preventDefault();
        }
    }
}

不要被行数骗了,其实很简单——只是为了可读性有点啰嗦(自文档代码对吧?)

我还应该提到这里的语言是TypeScript,但和往常一样,将它转换为JS很简单。