asp.net - 如何找出哪个按钮正在提交页面？

Question

我有一个与 ClientScript.RegisterOnSubmitStatement 绑定(bind)的函数，该函数在 UpdatePanel 更新时显示 JQuery UI 对话框(更新需要一段时间)。页面上有 2 个按钮，我想根据单击的按钮在对话框中显示不同的文本。有没有办法做这样的事情:

服务器端

ClientScript.RegisterOnSubmitStatement(this.GetType(), "ShowSplashScreen", "ShowSplashScreen(this)");

客户端

function ShowSplashScreen(source) { 
// Do stuff depending on the button that was clicked
}

目前，“源”是 DOM 窗口，而不是按钮。

Answer 1

您可以使用__EVENTTARGET来查找发起回发的控件:

/// <summary> 
/// Retrieves the control that caused the postback. 
/// </summary> 
/// <param name="page"></param> 
/// <returns></returns> 
private Control GetControlThatCausedPostBack() 
{ 
    Control ctrl = null; 

    //use the event target to get the control that initiated the postback 
    string ctrlName = Page.Request.Params.Get("__EVENTTARGET"); 
    if (!String.IsNullOrEmpty(ctrlName)) 
        ctrl = Page.FindControl(ctrlName); 

    //return the control to the calling method 
    return ctrl; 
}