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POModalPopupExtender shows popup when the user hits the back button
 

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    <p>How do I stop a ModalPopupExtender from showing the popup when a user navigates to the page via the browser's back button?</p> <p>I tried to implement the solution found <a href="http://forums.asp.net/p/1261943/2373610.aspx" rel="nofollow">here</a> which essentially handles the ModalPopup using client side script but had trouble with its implementation. ($find("modPop") always returns null). </p> <p>Are there other techniques for handling this?</p> <p>EDIT: <b>The plot thickens</b>. This only occurs because I am using an UpdatePanel inside of the popup. The code below should duplicate the error. Also note, the use of the dummy button is required.</p> <ol><li>Click button to show modal</li><li>Confirm modal</li> <li>Navigate away from page</li> <li>Navigate back to page w/ back button</li> <li>Modal appears undesireably.</li></ol> <pre><code>&lt;%@ Page Language="VB" AutoEventWireup="false" CodeFile="Test.aspx.vb" Inherits="Test" %&gt; &lt;form id="form1" runat="server"&gt; &lt;div&gt; &lt;asp:ScriptManager ID="ScriptManager1" runat="server" EnablePartialRendering="true"&gt; &lt;/asp:ScriptManager&gt; &lt;span style="display:none;"&gt;&lt;asp:Button ID="btnDummy" runat="server" Text="Dummy" /&gt;&lt;/span&gt; &lt;asp:Button id="btnShow" runat="server" Text="Show Modal"/&gt; &lt;ajax:ModalPopupExtender ID="mpTest" runat="server" TargetControlID="btnDummy" PopupControlID="pnlTest"&gt;&lt;/ajax:ModalPopupExtender&gt; &lt;asp:Panel id="pnlTest" style="display:none;border:10px solid green" DefaultButton="btnTest" runat="server"&gt; &lt;asp:UpdatePanel ID="upTest" runat="server"&gt; &lt;ContentTemplate&gt; &lt;asp:Button ID="btnTest" runat="server" Text="Test" /&gt; &lt;/ContentTemplate&gt; &lt;Triggers&gt; &lt;ajax:AsyncPostBackTrigger ControlID="btnTest" /&gt; &lt;/Triggers&gt; &lt;/asp:UpdatePanel&gt; &lt;/asp:Panel&gt; &lt;a href="http://stackoverflow.com"&gt;StackOverflow&lt;/a&gt; &lt;/div&gt; &lt;/form&gt; </code></pre> <pre>Partial Class Test Inherits System.Web.UI.Page Protected Sub btnShow_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnShow.Click mpTest.Show() End Sub Protected Sub btnTest_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnTest.Click mpTest.Hide() End Sub End Class</pre> <p>I think this makes sense as when you confirm the modal a full postback doesn't happen but I need to do it this way. Are there any workarounds? </p>
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