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POText box shows values incorrectly after return to page (ASP.NET 3.5)
 

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  1. POText box shows values incorrectly after return to page (ASP.NET 3.5)
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    <p>could you please clarify my issue?</p> <p>I have a starting page ListBox1.aspx that calls another one ListBox1_sub.aspx. I need to preserve a state of the page ListBox1.aspx so that after returning from ListBox1_sub.aspx all the controls of ListBox1.aspx keep their state. I assume it could be achieved by using a client-side code and in the attached code everything looks OK except one thing.</p> <p>In my code, I set the value of the Session variable Session("back_from_ListBox1_sub") in ListBox1_sub.aspx. After returning from ListBox1_sub.aspx to ListBox1.aspx, I expected the txtReturn TextBox to show the value of the Session variable. However, although this value was set to the text box, it was not shown.</p> <p>In the below code, the value of the Session variable is displayed only after the 2nd call to ListBox1_sub.aspx. For example, if I set the value to "x" in the first call and to "y" in the second call, after returning from the 2d call the value will be set to "x".</p> <p>Can you advise as to how I should modify my code so that the returned value be displayed correctly in the first page after the call to the second page? Many Thanks, Lev</p> <p>======= test code ======= == ListBox1.aspx =====</p> <pre><code>&lt;%@ Page Language="VB" AutoEventWireup="false" CodeFile="ListBox1.aspx.vb" Inherits="ListBox1" %&gt; &lt;!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"&gt; &lt;html xmlns="http://www.w3.org/1999/xhtml"&gt; &lt;head runat="server"&gt; &lt;title&gt;&lt;/title&gt; &lt;/head&gt; &lt;body&gt; &lt;form id="form1" runat="server"&gt; &lt;div&gt; &lt;asp:CheckBoxList ID="CheckBoxList1" runat=server Visible="True"&gt; &lt;asp:ListItem Text="a" /&gt; &lt;asp:ListItem Text="b" /&gt; &lt;asp:ListItem Text="c" /&gt; &lt;asp:ListItem Text="d" /&gt; &lt;/asp:CheckBoxList&gt; &lt;br /&gt; &lt;asp:LinkButton ID="lnkWindowOpen" runat="server" Text="Window.Open"&gt; &lt;/asp:LinkButton&gt; &lt;br /&gt; &lt;asp:TextBox ID="txtReturn" runat="server"&gt; &lt;/asp:TextBox&gt; &lt;/div&gt; &lt;/form&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>'code-behind</p> <pre><code>Partial Class ListBox1 Inherits System.Web.UI.Page Public Const JS_START As String = "&lt;script language=javascript&gt;" Public Const JS_END As String = "&lt;/script&gt;" Public Const DBQT As Char = Chr(34) Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load If Not (Session("back_from_ListBox1_sub") Is Nothing) Then txtReturn.Text = Session("back_from_ListBox1_sub").ToString End If End Sub Protected Sub lnkWindowOpen_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles lnkWindowOpen.Click Dim message As String Dim script As String message = "" message += "window.blur();" message += "window.open(" &amp; DBQT &amp; "ListBox1_sub.aspx" &amp; DBQT &amp; ",null," message += DBQT &amp; "height=200,width=400,top=300,left=325," message += "status=yes,toolbar=no,titlebar=0,menubar=no,location=no,scrollbars=0,resizable=0;modal=yes" &amp; DBQT &amp; ");" script = JS_START &amp; message &amp; JS_END ClientScript.RegisterClientScriptBlock(Page.GetType, Guid.NewGuid().ToString(), script) End Sub End Class </code></pre> <p>======== page ListBox1_sub.aspx ========== </p> <pre><code>&lt;%@ Page Language="VB" AutoEventWireup="false" CodeFile="ListBox1_sub.aspx.vb" Inherits="ListBox1_sub" %&gt; &lt;!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"&gt; &lt;html xmlns="http://www.w3.org/1999/xhtml"&gt; &lt;head runat="server"&gt; &lt;title&gt;&lt;/title&gt; &lt;/head&gt; &lt;body&gt; &lt;form id="form1" runat="server"&gt; &lt;div&gt; &lt;asp:ListBox ID="ListBox1" runat="server" AutoPostBack="True" OnSelectedIndexChanged="ListBox1_SelectedIndexChanged"&gt; &lt;asp:ListItem Text="x" /&gt; &lt;asp:ListItem Text="y" /&gt; &lt;asp:ListItem Text="z" /&gt; &lt;/asp:ListBox&gt; &lt;br /&gt; &lt;asp:TextBox ID="TextBox1" runat="server"&gt;&lt;/asp:TextBox&gt; &lt;br /&gt; &lt;asp:LinkButton ID="lnkBack" runat="server"&gt;Back&lt;/asp:LinkButton&gt; &lt;/div&gt; &lt;/form&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>'code-behind</p> <pre><code>Partial Class ListBox1_sub Inherits System.Web.UI.Page Public Const JS_START As String = "&lt;script language=javascript&gt;" Public Const JS_END As String = "&lt;/script&gt;" Public Const DBQT As Char = Chr(34) Protected Sub ListBox1_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles ListBox1.SelectedIndexChanged TextBox1.Text = ListBox1.SelectedItem.Text End Sub Protected Sub lnkBack_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles lnkBack.Click Dim message As String Dim script As String Session("back_from_ListBox1_sub") = TextBox1.Text message = "window.close();" script = JS_START &amp; message &amp; JS_END ClientScript.RegisterClientScriptBlock(Page.GetType, Guid.NewGuid().ToString(), script) End Sub End Class </code></pre>
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