我在更新面板中有一个列表框.当我向下滚动并选择一个项目时,它会滚动回列表框的顶部.我听说 dom 不会跟踪回发时的滚动位置.有没有人有关于如何解决这个问题的解决方案/示例?
I have a listbox inside an update panel. When I scroll down and select an item, it scrolls back to the top of the listbox. I heard that the dom does not keep track of the scroll position on a postback. Does anyone have a solution/example on how to solve this?
谢谢,赛软
您遇到了这个问题,因为 UpdatePanel
完全替换了滚动的 <select>
元素当异步请求返回时使用一个新的.
You're running into this problem because the UpdatePanel
completely replaces your scrolled <select>
element with a new one when the asynchronous request comes back.
可能的解决方案:
使用 JavaScript 将 元素的
scrollTop
属性存储在 UpdatePanel
之前的隐藏表单元素中提交(通过调用 ClientScriptManager.RegisterOnSubmitStatement
方法),然后在 AJAX 调用返回时将其设置在新的 上.这会很乏味、容易出错,而且可能不太兼容(请参阅 这里).
Use JavaScript to store the scrollTop
property of the <select>
element in a hidden form element before the UpdatePanel
is submitted (by calling the ClientScriptManager.RegisterOnSubmitStatement
method) and then setting it on the new <select>
when the AJAX call comes back. This will be tedious, error-prone, and probably not very compatible (see here).
使用 JavaScript 存储 <select>
的 selectedIndex
属性,并在 AJAX 调用返回时重新选择该项目.如果用户还没有选择任何东西,这显然是行不通的.
Use JavaScript to store the <select>
's selectedIndex
property and re-select that item when the AJAX call comes back. Obviously this won't work if the user hasn't selected anything yet.
不要't 使用 UpdatePanel
s.试试 jQuery + ASP.NET 页面方法.
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