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

上面的方法不是那么自然,经过一些谷歌我找到了一个更好的解决方案,不需要jQuery。参见[1]和演示[2]。

var element = document.getElementById('uf-notice-ul'); var isMacWebkit = (navigator.userAgent.indexOf("Macintosh") !== -1 && navigator.userAgent.indexOf("WebKit") !== -1); var isFirefox = (navigator.userAgent.indexOf("firefox") !== -1); element.onwheel = wheelHandler; // Future browsers element.onmousewheel = wheelHandler; // Most current browsers if (isFirefox) { element.scrollTop = 0; element.addEventListener("DOMMouseScroll", wheelHandler, false); } // prevent from scrolling parrent elements function wheelHandler(event) { var e = event || window.event; // Standard or IE event object // Extract the amount of rotation from the event object, looking // for properties of a wheel event object, a mousewheel event object // (in both its 2D and 1D forms), and the Firefox DOMMouseScroll event. // Scale the deltas so that one "click" toward the screen is 30 pixels. // If future browsers fire both "wheel" and "mousewheel" for the same // event, we'll end up double-counting it here. Hopefully, however, // cancelling the wheel event will prevent generation of mousewheel. var deltaX = e.deltaX * -30 || // wheel event e.wheelDeltaX / 4 || // mousewheel 0; // property not defined var deltaY = e.deltaY * -30 || // wheel event e.wheelDeltaY / 4 || // mousewheel event in Webkit (e.wheelDeltaY === undefined && // if there is no 2D property then e.wheelDelta / 4) || // use the 1D wheel property e.detail * -10 || // Firefox DOMMouseScroll event 0; // property not defined // Most browsers generate one event with delta 120 per mousewheel click. // On Macs, however, the mousewheels seem to be velocity-sensitive and // the delta values are often larger multiples of 120, at // least with the Apple Mouse. Use browser-testing to defeat this. if (isMacWebkit) { deltaX /= 30; deltaY /= 30; } e.currentTarget.scrollTop -= deltaY; // If we ever get a mousewheel or wheel event in (a future version of) // Firefox, then we don't need DOMMouseScroll anymore. if (isFirefox && e.type !== "DOMMouseScroll") { element.removeEventListener("DOMMouseScroll", wheelHandler, false); } // Don't let this event bubble. Prevent any default action. // This stops the browser from using the mousewheel event to scroll // the document. Hopefully calling preventDefault() on a wheel event // will also prevent the generation of a mousewheel event for the // same rotation. if (e.preventDefault) e.preventDefault(); if (e.stopPropagation) e.stopPropagation(); e.cancelBubble = true; // IE events e.returnValue = false; // IE events return false; }

[1] https://dimakuzmich.wordpress.com/2013/07/16/prevent-scrolling-of-parent-element-with-javascript/

[2] http://jsfiddle.net/dima_k/5mPkB/1/

其他回答

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);

我添加这个答案是为了完整性,因为@amustill接受的答案在Internet Explorer中不能正确解决问题。详情请参阅我原始帖子中的评论。另外,这个解决方案不需要任何插件——只需要jQuery。

本质上,代码通过处理鼠标滚轮事件来工作。每个这样的事件都包含一个wheelDelta,它等于它要将可滚动区域移动到的px的数量。如果这个值是>0,那么我们向上滚动。如果wheelDelta <0,则向下滚动。

FireFox: FireFox使用DOMMouseScroll作为事件,并填充originalEvent.detail,其+/-与上面描述的相反。它通常以3为间隔返回滚动,而其他浏览器则以120为间隔返回滚动(至少在我的机器上是这样)。为了纠正,我们只需检测它并乘以-40来归一化。

@amustill的答案是取消事件,如果<div>的滚动区域已经在顶部或底部的最大位置。但是,当增量大于剩余的可滚动空间时,Internet Explorer将忽略已取消的事件。

换句话说,如果你有一个200px高的<div>包含500px的可滚动内容,而当前的scrollTop是400,一个告诉浏览器再滚动120px的鼠标滚轮事件将导致<div>和<body>滚动,因为400 + 120 > 500。

因此,为了解决这个问题,我们必须做一些稍微不同的事情,如下所示:

必备的jQuery代码是:

$(document).on('DOMMouseScroll mousewheel', '.Scrollable', function(ev) {
    var $this = $(this),
        scrollTop = this.scrollTop,
        scrollHeight = this.scrollHeight,
        height = $this.innerHeight(),
        delta = (ev.type == 'DOMMouseScroll' ?
            ev.originalEvent.detail * -40 :
            ev.originalEvent.wheelDelta),
        up = delta > 0;

    var prevent = function() {
        ev.stopPropagation();
        ev.preventDefault();
        ev.returnValue = false;
        return false;
    }

    if (!up && -delta > scrollHeight - height - scrollTop) {
        // Scrolling down, but this will take us past the bottom.
        $this.scrollTop(scrollHeight);
        return prevent();
    } else if (up && delta > scrollTop) {
        // Scrolling up, but this will take us past the top.
        $this.scrollTop(0);
        return prevent();
    }
});

从本质上讲,这段代码取消了任何会创建不需要的边缘条件的滚动事件,然后使用jQuery将<div>的scrollTop设置为最大值或最小值,这取决于鼠标滚轮事件请求的方向。

由于事件在任何一种情况下都被完全取消,因此它根本不会传播到主体,因此解决了IE以及所有其他浏览器中的问题。

我还在jsFiddle上提供了一个工作示例。

还有一个有趣的技巧,当鼠标悬停在可滚动元素上时,锁定父元素的scrollTop。这样你就不必实现自己的滚轮。

下面是一个防止文档滚动的示例,但它可以针对任何元素进行调整。

scrollable.mouseenter(function ()
{
  var scroll = $(document).scrollTop();
  $(document).on('scroll.trap', function ()
  {
    if ($(document).scrollTop() != scroll) $(document).scrollTop(scroll);
  });
});

scrollable.mouseleave(function ()
{
  $(document).off('scroll.trap');
});

jQuery插件模拟自然滚动的Internet Explorer

  $.fn.mousewheelStopPropagation = function(options) {
    options = $.extend({
        // defaults
        wheelstop: null // Function
        }, options);

    // Compatibilities
    var isMsIE = ('Microsoft Internet Explorer' === navigator.appName);
    var docElt = document.documentElement,
        mousewheelEventName = 'mousewheel';
    if('onmousewheel' in docElt) {
        mousewheelEventName = 'mousewheel';
    } else if('onwheel' in docElt) {
        mousewheelEventName = 'wheel';
    } else if('DOMMouseScroll' in docElt) {
        mousewheelEventName = 'DOMMouseScroll';
    }
    if(!mousewheelEventName) { return this; }

    function mousewheelPrevent(event) {
        event.preventDefault();
        event.stopPropagation();
        if('function' === typeof options.wheelstop) {
            options.wheelstop(event);
        }
    }

    return this.each(function() {
        var _this = this,
            $this = $(_this);
        $this.on(mousewheelEventName, function(event) {
            var origiEvent = event.originalEvent;
            var scrollTop = _this.scrollTop,
                scrollMax = _this.scrollHeight - $this.outerHeight(),
                delta = -origiEvent.wheelDelta;
            if(isNaN(delta)) {
                delta = origiEvent.deltaY;
            }
            var scrollUp = delta < 0;
            if((scrollUp && scrollTop <= 0) || (!scrollUp && scrollTop >= scrollMax)) {
                mousewheelPrevent(event);
            } else if(isMsIE) {
                // Fix Internet Explorer and emulate natural scrolling
                var animOpt = { duration:200, easing:'linear' };
                if(scrollUp && -delta > scrollTop) {
                    $this.stop(true).animate({ scrollTop:0 }, animOpt);
                    mousewheelPrevent(event);
                } else if(!scrollUp && delta > scrollMax - scrollTop) {
                    $this.stop(true).animate({ scrollTop:scrollMax }, animOpt);
                    mousewheelPrevent(event);
                }
            }
        });
    });
};

https://github.com/basselin/jquery-mousewheel-stop-propagation/blob/master/mousewheelStopPropagation.js

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();
                }
            }
        });
    }
};