Angular JS指令

我必须封装一个角度指令。以下是其他答案的混搭。在Chrome和Internet Explorer 11上进行了测试。

var app = angular.module('myApp');

app.directive("preventParentScroll", function () {
    return {
        restrict: "A",
        scope: false,
        link: function (scope, elm, attr) {
            elm.bind('mousewheel', onMouseWheel);
            function onMouseWheel(e) {
                elm[0].scrollTop -= (e.wheelDeltaY || (e.originalEvent && (e.originalEvent.wheelDeltaY || e.originalEvent.wheelDelta)) || e.wheelDelta || 0);
                e.stopPropagation();
                e.preventDefault();
                e.returnValue = false;
            }
        }
    }
});

使用

<div prevent-parent-scroll>
    ...
</div>

---

希望这能帮助下一个从谷歌搜索到这里的人。

Angular JS指令

我必须封装一个角度指令。以下是其他答案的混搭。在Chrome和Internet Explorer 11上进行了测试。

var app = angular.module('myApp');

app.directive("preventParentScroll", function () {
    return {
        restrict: "A",
        scope: false,
        link: function (scope, elm, attr) {
            elm.bind('mousewheel', onMouseWheel);
            function onMouseWheel(e) {
                elm[0].scrollTop -= (e.wheelDeltaY || (e.originalEvent && (e.originalEvent.wheelDeltaY || e.originalEvent.wheelDelta)) || e.wheelDelta || 0);
                e.stopPropagation();
                e.preventDefault();
                e.returnValue = false;
            }
        }
    }
});

使用

<div prevent-parent-scroll>
    ...
</div>

---

希望这能帮助下一个从谷歌搜索到这里的人。

我也遇到过类似的情况，我是这样解决的: 所有可滚动的元素使类可滚动。

$(document).on('wheel', '.scrollable', function(evt) {
  var offsetTop = this.scrollTop + parseInt(evt.originalEvent.deltaY, 10);
  var offsetBottom = this.scrollHeight - this.getBoundingClientRect().height - offsetTop;

  if (offsetTop < 0 || offsetBottom < 0) {
    evt.preventDefault();
  } else {
    evt.stopImmediatePropagation();
  }
});

stopImmediatePropagation()确保不从可滚动的子区域滚动父可滚动区域。

下面是它的一个普通JS实现: http://jsbin.com/lugim/2/edit?js,output

对于那些使用MooTools的人，这里是等效的代码:

            'mousewheel': function(event){
            var height = this.getSize().y;
            height -= 2;    // Not sure why I need this bodge
            if ((this.scrollTop === (this.scrollHeight - height) && event.wheel < 0) || 
                (this.scrollTop === 0 && event.wheel > 0)) {
                event.preventDefault();
            }

请记住，像其他人一样，我必须将一个值调整几个px，这就是height -= 2的意义。

基本上，主要的区别是在MooTools中，增量信息来自事件。轮，而不是传递给事件的额外参数。

此外，如果我将这段代码绑定到任何东西(event.target。绑定函数的scrollHeight不等于此值。scrollHeight(非绑定)

希望这篇文章能像这篇文章帮助我一样帮助别人;)

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;
}

我知道这是一个相当老的问题，但由于这是谷歌的顶级结果之一……我不得不以某种方式取消滚动冒泡没有jQuery和这段代码为我工作:

function preventDefault(e) {
  e = e || window.event;
  if (e.preventDefault)
    e.preventDefault();
  e.returnValue = false;  
}

document.getElementById('a').onmousewheel = function(e) { 
  document.getElementById('a').scrollTop -= e. wheelDeltaY; 
  preventDefault(e);
}