选择TreeView节点,页面回送刷新后,滚动条自动回到TreeView顶部,而不是被选中节点处,使节点在Treeview可视区域可见,可以利用scrollIntoView方法使TreeView中页面刷新后自动定位到被选择节点处,使被选择节点可见,方法如下:
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scrollTop、scrollLeft、scrollWidth、scrollHeight
scrollTop 是“卷”起来的高度值,示例:
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由于为外层元素 p 设置了 scrollTop,所以内层元素会向上卷。
scrollLeft 也是类似道理。
我们已经知道 offsetHeight 是自身元素的宽度。
而 scrollHeight 是内部元素的绝对宽度,包含内部元素的隐藏的部分。
上述中 p 的 scrollHeight 为 300,而 p 的 offsetHeight 为 100。
scrollWidth 也是类似道理。