客户确认后DROPDOWNLIST autoposback [英] DropdownList autoposback after client confirmation

问题描述

我有设置为true的自动回一个DropDownList。我想要的
用户确认，如果他们真的想改变的价值，
这对后回触发一个服务器端事件（的SelectedIndexChanged）。

I have a dropdownlist with the autopostback set to true. I want the user to confirm if they really want to change the value, which on post back fires a server side event (selectedindexchanged).

我曾尝试添加onchange属性返回确认（请单击确定以更改，否则单击取消。？;），但它不会不管回发确认的
结果，如果取消列表中的值不恢复
选中。

I have tried adding an onchange attribute "return confirm('Please click OK to change. Otherwise click CANCEL?';") but it will not postback regardless of the confirm result and the value in the list does not revert back if cancel selected.

当我从DROPDOWNLIST标签移除onchange属性，页面不回发。它不添加onchange属性时。我还需要接线的事件处理程序（我在C＃.NET 2.0）。

When I remove the onchange attribute from the DropdownList tag, the page does postback. It does not when the onchange attribute is added. Do I still need to wire the event handler (I'm on C# .Net 2.0 ).

任何线索会有所帮助。

谢谢！

推荐答案

您是否尝试过onChange事件设置为一个JavaScript函数，然后在函数中显示JavaScript警告，如果它通过利用__doPostBack功能？

Have you tried to set the onChange event to a javascript function and then inside the function display the javascript alert and utilize the __doPostback function if it passes?

即

   
drpControl.Attributes("onChange") = "DisplayConfirmation();"

function DisplayConfirmation() {
  if (confirm('Are you sure you want to do this?')) {
    __doPostback('drpControl','');
  }
}

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