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Normal Topic LinkCreated firing again on postback (Read 2326 times)
jcollins@scires
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LinkCreated firing again on postback
Feb 23rd, 2009 at 3:33pm
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Hello, I have server side code within the LinkCreated event. It gets executed fine after the link is created. Yet, if you postback again after the link has been created, the event fires again. I am not sure why this is happening. Below is my code:
aspx:
<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default3.aspx.vb" Inherits="Default3" %>
<%@ Register Assembly="MindFusion.Extenders" Namespace="MindFusion.Diagramming.WebForms"
    TagPrefix="cc1" %>

<%@ Register Assembly="MindFusion.Diagramming.WebForms" Namespace="MindFusion.Diagramming.WebForms"
    TagPrefix="ndiag" %>
   
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
       <asp:ScriptManager ID="ScriptManager1" runat="server" />
       <div>
           <asp:UpdatePanel ID="UpdatePanel1" runat="server">
               <ContentTemplate>
                   <table style="table-layout:fixed;">
                       <tr>
                           <td style="width:740px">
                               <ndiag:DiagramView ID="diagView"  AutoScroll="true"  runat="server" Height="480px" Width="740px" ClientSideMode="ImageMap" >
                                   <Diagram AllowSelfLoops="false" />
                               </ndiag:DiagramView>
                           </td>
                           <td style="vertical-align:top;">
                               <ndiag:Overview ID="ovw" runat="server" DiagramViewID="diagView" Style="left: 680px; width: 120px;
                               top: 320px; height: 160px; display:inline;" />
                           </td>
                       </tr>
                   </table>
                   <cc1:InteractivityExtender ID="InteractivityExtender1" TargetControlID="diagView" runat="server" />
                   <cc1:OverviewExtender ID="ovrExt" TargetControlID="ovw" runat="server" />
               </ContentTemplate>
           </asp:UpdatePanel>
           <asp:Button ID="btnPostBack" runat="server" Text="Postback" />
      </div>
    </form>
</body>
</html>




when I click on btnPostBack, the event fires again and I don't want it to since it has already fired.

Thanks.
Jay
  
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Stoyo
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Re: LinkCreated firing again on postback
Reply #1 - Feb 23rd, 2009 at 4:01pm
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Hi,

Seems some hidden fields are not cleared when reloading from an update panel. As a workaround you could set the value of _mfusion_diagView_ClickedItem to an empty string from the onload handler until we fix it.

Stoyan

edit: you should also clear the value of _mfusion_diagView_Ajax.
  
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jcollins@scires
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Re: LinkCreated firing again on postback
Reply #2 - Feb 23rd, 2009 at 5:27pm
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Thanks for the quick response. I tried the following workaround script below but it still seems to fire twice.

<script type="text/javascript" language="javascript">
           Sys.Application.add_load(loadHandler)
           function loadHandler() 
          { 
               _mfusion_diagView_ClickedItem='';
               _mfusion_diagView_Ajax='';
          }
       </script>
  
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Stoyo
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Re: LinkCreated firing again on postback
Reply #3 - Feb 24th, 2009 at 9:03am
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Hi,

These are HIDDEN html elements, and you should set their value attribute, e.g.:

Code
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field = $get('_mfusion_diagView_ClickedItem');
field.value = '';
field = $get('_mfusion_diagView_Ajax');
field.value = '';


Anyway we'll upload the fixed version in a couple of days.

Stoyan
  
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