不使用ASP.NET WebForm Button控制項，使用html Button並在Button的onclick事件中，使用javascript觸發postback，在Page_Load中去確認哪一個按鈕觸發。
以下的作法，不曉得是否正確，還請各位程式設計師們不吝指教。
test_js_postback.aspx
<%@ Page Language="VB" AutoEventWireup="false" CodeFile="test_js_postback.aspx.vb" Inherits="test_js_postback" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title></title>
<script type="text/javascript">
function Button1_Click() {
<%=ClientScript.GetPostBackEventReference(Me, "Button1_Click").ToString%>
};
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<input id="Button1" type="button" value="測試javascript觸發postback" onclick="Button1_Click();" />
<span id="span_message" runat="server">[訊息顯示在此處]</span>
</div>
</form>
</body>
</html>
test_js_postback.aspx.vb
Partial Class test_js_postback
Inherits System.Web.UI.Page
Private Sub test_js_postback_Load(sender As Object, e As EventArgs) Handles Me.Load
If Not Page.IsPostBack Then
Else
Dim con As Control = Nothing
Dim str_event_target As String = String.Empty
Dim str_event_targument As String = String.Empty
str_event_target = Page.Request.Params.Get("__EVENTTARGET") 'html hidden __EVENTTARGET
str_event_targument = Page.Request.Params.Get("__EVENTARGUMENT") 'html hidden __EVENTARGUMENT
If (Not str_event_target Is Nothing) And (str_event_target <> "") Then
con = Page.FindControl(str_event_target)
Response.Write("EVENTTARGET=[" & str_event_target & "][" & con.GetType.ToString & "]<br/>")
If InStr(1, str_event_target.ToLower, "page", CompareMethod.Text) > 0 Then
If (Not str_event_targument Is Nothing) And (str_event_targument <> "") Then
Response.Write("EVENTARGUMENT=[" & str_event_targument & "]<br/>")
If str_event_targument = "Button1_Click" Then 'html input的Button1_Click
Me.span_message.InnerHtml = "觸發Button1_Click<br/>"
End If
Else
Response.Write("EVENTARGUMENT=[無]<br/>")
End If
End If
Else
Response.Write("PostBack:可能是某個控制項送出<br/>")
End If
End If
End Sub
End Class
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