如何在javascript之前调用代码 [英] How to call code behind before javascript

问题描述

我有2页

第1页包含一个asp按钮，它应该调用函数后面的代码然后打开page2作为弹出窗口

on page2还有一个asp按钮应该从自己的代码后面调用一个函数而另一个函数从page1代码后面然后关闭弹出窗口



换句话说：我需要传输数据来自page1到page2，并在关闭之前准备page2中的另一个数据，并通知page1关于关闭以接收数据



注意：我想在没有用户权限的情况下执行此操作，所以从代码注册脚本？不是我要找的！



我用会话来传输数据



我尝试了什么：



我试图使用javascript调用隐形asp按钮点击事件

它适用于page1但是并不总是



page1使用母版页

page2 webform



在这段代码中，我使用了

I have 2 pages
page 1 contains an asp button which should call a code behind function then open the page2 as a popup window
on page2 there is also an asp button which should call a function from its own code behind and another function from page1 code behind then close the popup window

in other words: I need to transfer data from page1 to page2, and prepare another data in page2 before closing and inform page1 about closing to receive the data

note: I want to do this without user permission for the popup, so registering scripts from code behind? not what I am looking for!

"I use sessions to transfer data"

What I have tried:

I tried to call an invisible asp buttons click event using javascript
It works in page1 but not always

"page1 using master page"
"page2 webform"

At this code I used

document.getElementById('ContentPlaceHolder1_HiddenButton').click();

在打开弹出窗口之前创建数据会话。并使用

in page1 to create the data session before opening the popup. and used

document.getElementById('HiddenButton').click();

在第2页中准备另一个数据会话以便返回。还使用了

in page2 to prepare another data session for return. also used

opener.document.getElementById('ContentPlaceHolder1_HiddenButton1').click();

告知第1页关于新数据会话和弹出结束的信息。



page1 code < br $>

in page2 to inform page1 about new data session and popup closing.

page1 code

<script type="text/jscript">
     
       function OpenPopup() {
         document.getElementById('ContentPlaceHolder1_HiddenButton').click();
         window.open("WebForm1.aspx", "List", "scrollbars=yes,resizable=no,width=1000,height=600");
            return false;
        }

    </script>

 <asp:Button  ID="HiddenButton1" runat="server" Text="Button"  style="display:none"	

        OnClick="HiddenButton1_Click"/>
    <asp:Button  ID="HiddenButton" runat="server" Text="Button" style="display:none"	OnClick="HiddenButton_Click"/>

<asp:Button ID="btnOffer" runat="server" Text="Add Offer"  onclientclick="javascript:return OpenPopup();"/>

page2 code

page2 code

<script type="text/javascript"> 
   function returnValues() {
    
            document.getElementById('HiddenButton').click();
           opener.document.getElementById('ContentPlaceHolder1_HiddenButton1').click();
            window.close();
     
    }
    </script>

 <asp:Button  ID="HiddenButton" runat="server" Text="Button" style="display:none" OnClick="HiddenButton_Click"/>

<asp:Button ID="btnFinish" runat="server"  OnClientClick="javascript:return returnValues()" Text="finish and close" />

推荐答案

我刚刚在父页面（page1）上创建了一个函数，如下所示：

I just created a function on parent page(page1) as below:

function InformedFromPage2() {
           alert('from page2');
       }

在第2页，我调用了以下函数：

And on page 2 I called the function as followed:

function returnValues() {
           opener.InformedFromPage2();
           document.getElementById('HiddenButton').click();
           opener.document.getElementById('HiddenButton1').click();
           window.close();

       }

为什么不学习和使用AJAX来调用服务器方法。这样你就不会处理回调，这可能会让你在与JavaScript逻辑混合时感到痛苦。这是一个可以帮助您入门的快速参考：使用jQuery AJAX和ASP.NET与数据库进行通信的许多方法 [ ^ ]

why not learn and use AJAX to invoke server methods. That way you won't be dealing with postbacks which could cause you pain when mixing with JavaScript logic. Here's a quick reference that may help you get started: Many ways to communicate with your database using jQuery AJAX and ASP.NET[^]

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