如何检查ASP.NET按钮是否被点击或没有在页面加载 [英] How to check whether ASP.NET button is clicked or not on page load

问题描述

如何检查是否某个特殊按钮被点击或者不ASP.NET？

How can I check whether a particular button was clicked or not in ASP.NET?

我想我需要执行对的Page_Load 一些操作。这不应该是进入到 Button_Click 事件找到。有什么办法，我可以找到它被点击或没有在客户端，并把它的Page_Load ？

I think I need to perform some operation on Page_Load. This shouldn't be entering to Button_Click event to find. Is there any way that I can find where it was clicked or not on Client Side and take it to Page_Load?

推荐答案

背景：基本上 __ EVENTTARGET 和 __ EVENTARGUMENT ，这两个隐藏控件添加到HTML源代码，当过任何的AutoPostBack属性设置为true的任何网络的控制。

Background: Basically __EVENTTARGET and __EVENTARGUMENT , These two Hidden controls are added to the HTML source, when ever any autopostback attribute is set to true for any of the web control.

的 __ EVENTTARGET 隐变量会告诉服务器，它实际控制做服务器端事件触发，使这个框架可以触发该控制服务器端事件。

The __EVENTTARGET hidden variable will tell the server ,which control actually does the server side event firing so that the framework can fire the server side event for that control.

__ EVENTARGUMENT 变量用于如果需要由应用程序，它可以在服务器进行访问，以提供额外的事件信息。

The __ EVENTARGUMENT variable is used to provide additional event information if needed by the application, which can be accessed in the server.

因此​​，我们可以很容易地得到控制使用造成回传： Request.Params.Get（__ EVENTTARGET）;

So we can easily get the control causing postback using:Request.Params.Get("__EVENTTARGET");

问题：的

PROBLEM:

的方法： Request.Params.Get（__ EVENTTARGET）; 将为的CheckBox ， DropDownLists ， LinkBut​​tons ，等等。但这并不Button控件，如<$ C工作$ C>按钮和 ImageButtons 的

The method: Request.Params.Get("__EVENTTARGET"); will work for CheckBoxes, DropDownLists, LinkButtons, etc.. but this does not work for Button controls such as Buttons and ImageButtons

的按钮控制和的ImageButton 控制不叫 __ doPostBack 功能。正因为如此，在 _EVENTTARGET 将永远是空的。然而，其他控件使用javascript函数 __ doPostBack 触发回发。

The Button controls and ImageButton controls does not call the __doPostBack function. Because of this, the _EVENTTARGET will always be empty. However, other controls uses javascript function __doPostBack to trigger postback.

所以，我会建议如下做一些事情。一个的OnClientClick 属性添加到按钮。此外，在您的标记，其价值将包含实际按钮导致回发定义hiddenField。

So, I will suggest to do something as below. Add an OnClientClick property to the buttons. Also, define a hiddenField in your Markup, whose value will contain the actual button causing postback.

<asp:Button ID="Button1" runat="server" Text="Button"
     OnClientClick = "SetSource(this.id)" />
<asp:ImageButton ID="ImageButton1" runat="server"
     OnClientClick = "SetSource(this.id)" />
<asp:HiddenField ID="hidSourceID" runat="server" />

在按钮的的OnClientClick 属性和的ImageButton 调用的SetSource JavaScript函数

On the OnClientClick property of the Button and ImageButton Call the SetSource JavaScript function

<script type = "text/javascript">
    function SetSource(SourceID)
    {
        var hidSourceID =
        document.getElementById("<%=hidSourceID.ClientID%>");
        hidSourceID.value = SourceID;
    }
</script>

在这里起，你可以非常容易地查看您的Page_Load 去哪家控制造成回发：

if (IsPostBack)
{
    string CtrlName;
    CtrlName=hidSourceID.Value;
}

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