此处示例:http://codepen.io/eliseosoto/pen/YqxQKx
const l = document.getElementById('scrollableList');
const item3 = document.getElementById('item3');
l.addEventListener('mouseover', function(e) {
e.stopPropagation();
e.preventDefault();
console.log('mouseover', e.target);
});
item3.addEventListener('dragenter', function(e) {
e.stopPropagation();
e.preventDefault();
console.log('dragenter', e.target);
});
l.addEventListener('dragover', function(e) {
console.log('xxx');
e.stopPropagation();
e.preventDefault();
});
l.addEventListener('scroll', function(e) {
console.log('scroll!', e);
e.stopPropagation();
e.preventDefault();
});
item3.addEventListener('dragover', function(e) {
console.log('dragover item3');
e.stopPropagation();
e.preventDefault();
});
#container {
background-color: lightblue;
}
#scrollableList {
height: 50px;
background-color: green;
overflow: auto;
}
<div id="container">
<br>
<div id="scrollableList">
<div>Item 1</div>
<div>Item 2</div>
<div id="item3">Item 3</div>
<div>Item 4</div>
<div>Item 5</div>
<div>Item 6</div>
<div>Item 7</div>
<div>Item 8</div>
<div>Item 9</div>
<div>Item 10</div>
<div>Item 11</div>
<div>Item 12</div>
<div>Item 13</div>
<div>Item 14</div>
</div>
<br>
<div id="dragMe" draggable="true">Drag me near the top/bottom of the Item list.</div>
</div>
请注意,当您在“项目”列表的顶部/底部附近拖动“拖动我...”文本时,该列表将自动滚动。
通常这种行为很有用,因为您可以查看所需的放置区域,但有时根本不需要。
是否有纯粹的JS方法可以在Chrome 47+中禁用该行为?我尝试在不同的元素上使用'dragover','mouseover','scroll'等无效。
答案 0 :(得分:0)
我能够通过存储滚动的当前位置来实现这一点,当引发滚动事件时,我将scrollTop设置为先前存储的位置。
const list = document.getElementById('scrollableList');
const dragMe = document.getElementById('dragMe');
var scrollPosition = 0;
dragMe.addEventListener('dragstart', function(e) {
scrollPosition = list.scrollTop;
list.addEventListener('scroll', preventDrag);
});
dragMe.addEventListener('dragend', function(e) {
list.removeEventListener('scroll', preventDrag);
});
function preventDrag(e) {
list.scrollTop = scrollPosition;
};
很奇怪你无法取消滚动事件。