如何拦截在页面回发任何？ - ASP.NET [英] How to intercept any postback in a page? - ASP.NET

问题描述

我要截取当前页面的的回传之前的它发生。我想要做一些自定义的操作回传送达前。任何想法如何做到这一点？

I want to intercept any postbacks in the current page BEFORE it occurs . I want to do some custom manipulation before a postback is served. Any ideas how to do that?

推荐答案

有一对夫妇的事情可以做，拦截客户端上的回发。

There's a couple of things you can do to intercept a postback on the client.

该__doPostBack函数如下：

The __doPostBack function looks like this:

function __doPostBack(eventTarget, eventArgument) {
    if (!theForm.onsubmit || (theForm.onsubmit() != false)) {
        theForm.__EVENTTARGET.value = eventTarget;
        theForm.__EVENTARGUMENT.value = eventArgument;
        theForm.submit();
    }
}

请注意，它调用theForm.onsubmit（）之前，实际上做回发。这意味着，如果您将其分配形式的onsubmit的javascript函数，它总是会回发的每个之前调用。

Notice that it calls "theForm.onsubmit()" before actually doing the postback. This means that if you assign your form an onsubmit javascript function, it will always be called before every postback.

<form id="form1" runat="server" onsubmit="return myFunction()">

另外，你其实可以覆盖__doPostBack功能，并用自己的替换它。这是用于早在ASP.Net1.0天一个老把戏。

Alternately, you can actually override the __doPostBack function and replace it with your own. This is an old trick that was used back in ASP.Net 1.0 days.

var __original= __doPostBack;
__doPostBack = myFunction();

此替换自己的__doPostBack功能，你可以从你的新调用原来的。

This replaces the __doPostBack function with your own, and you can call the original from your new one.

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