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onbeforeunload event on Maximize/Restore command

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This is a migrated thread and some comments may be shown as answers.

Eugene asked on 27 Jan 2009, 01:01 PM

Hi guys,

Can you please explain why when click on Maximize/Restore button the "onbeforeunload" event of parent window is fired? And how it can be avoided?

Here is the code:

    
            <%@ Page Language="C#" CodeFile="Default.aspx.cs" Inherits="_Default" %> 
        
            <%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %> 
        
            <html> 
        
            <head> 
        
            <title>Rad Window Test</title> 
        
            </head> 
        
            <body onbeforeunload="alert('onbeforeunload')"> 
        
                <form runat="server"> 
        
                <asp:ScriptManager ID="PageScriptManager" runat="server"> 
        
                </asp:ScriptManager> 
        
                <%for (int i = 0; i < 100; i++) {%> 
        
                <a onclick="radopen('http://google.com/', 'testWind')" href="javascript:void(0)">google</a><br />         
        
                <%} %>    
        
                <telerik:RadWindowManager ID="RadWindowManager2" runat="server"> 
        
                    <Windows> 
        
                        <telerik:RadWindow ID="testWind" runat="server" /> 
        
                    </Windows> 
        
                </telerik:RadWindowManager> 
        
                </form> 
        
            </body> 
        
            </html>

Browser: IE 7

2 Answers, 1 is accepted

answered on 27 Jan 2009, 02:56 PM

Hello Eugene,

We are familiar with this problem and we will fix it for one of the following updates.
Here is how to fix the problem with the current version:

Add return false to the onclick handler
Hook to the OnClientShow eventhandler and use the following code:

    
            <%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %>  
        
            <html>  
        
            <head>  
        
            <title>Rad Window Test</title>  
        
            </head>  
        
            <body onbeforeunload="alert('onbeforeunload')">  
        
                <form id="Form1" runat="server">  
        
                <asp:ScriptManager ID="PageScriptManager" runat="server">  
        
                </asp:ScriptManager>  
        
                   <script type="text/javascript"> 
        
                    function OnClientShow(wnd)   
        
                    {               
        
                        wnd.get_popupElement().onclick = function(e){return false;}   
        
                    }  
        
                    </script> 
        
                <%for (int i = 0; i < 100; i++) {%>  
        
                <a onclick="radopen('http://google.com/', 'testWind'); return false;" href="javascript:void(0)">google</a><br />          
        
                <%} %>     
        
                <telerik:RadWindowManager OnClientShow="OnClientShow" ID="RadWindowManager2" runat="server">  
        
                    <Windows>  
        
                        <telerik:RadWindow ID="testWind" runat="server" />  
        
                    </Windows>  
        
                </telerik:RadWindowManager>  
        
                </form>  
        
            </body>  
        
            </html>

Kind regards,
Georgi Tunev
the Telerik team

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