showModalDialog()

leion · March 30th, 2004, 08:53 AM

I'm practising using showModalDialog() but there is a problem occur during the execution. when i close or submit a value back to parent.aspx from child.aspx, the application will pop up another child.aspx in the same time the value transfer back to parent.aspx. the sample codes are as below

===========
parent.aspx
===========
<%@ Page AutoEventWireup="false" Src="parent.aspx.vb" Inherits="parent"%>

<form runat="server">
<asp:textbox runat="server" id="submitText"/>
<asp:button runat="server" id="button1" Text="Submit"/>
</form>

==============
parent.aspx.vb
==============
Public Class parent
Inherits System.Web.UI.Page
Protected WithEvents button1 As System.Web.UI.WebControls.Button

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

button1.Attributes.Add("onclick", "var strReturn; strReturn=window.showModalDialog"& _
"('child.aspx','','status:no;dialogWidth:370px;dia logHeight:220px;"& _
"dialogHide:true;help:no;scroll:yes;');if (strReturn != null) document.getElementById('SubmitText')."& _
"value=strReturn;")

End Sub
End Class

==========
child.aspx
==========
<%@ Page Language="vb" AutoEventWireup="false" Src="child.aspx.vb" Inherits="child"%>

<form runat="server">
<asp:textbox id="returnText" runat="server"/>
<asp:button id="Submit" runat="server" Text="Submit"/>
<asp:button id="btnCancel" runat="server" Text="Cancel"/>
</form>

=============
child.aspx.vb
=============
Public Class child
Inherits System.Web.UI.Page
Protected WithEvents submit, btnCancel As System.Web.UI.WebControls.Button

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
submit.Attributes.Add("onclick", "window.returnValue = "& _
"document.getElementById('returnText').value; window.close();")
btnCancel.Attributes.Add("onclick", "window.close();")
End Sub
End Class

===============================================
Can anybody tells me why this happen? I keep and keep searching for the problem but failed. any help will be appreciated.

tarunvars · April 3rd, 2004, 04:02 AM

put IsPostBack check in the pag_load event of parent form as...

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

       If not IsPostBack Then
          button1.Attributes.Add("onclick", "var strReturn; strReturn=window.showModalDialog"& _
               "('child.aspx','','status:no;dialogWidth:370px;dia logHeight:220px;"& _
            "dialogHide:true;help:no;scroll:yes;');if (strReturn != null) document.getElementById('SubmitText')."& _
"value=strReturn;")
         End If

End Sub

leion · April 4th, 2004, 08:27 PM

Hi tarunvars, thanks for your suggestion but it seems that this method does not work anyway...

RayAndrade · June 6th, 2004, 04:08 PM

Hope this helps:

In the <HEAD> tag of the child page place <base target="_self">.

This tells the form that it is the target of itself when it comes to various functions.

Next in the Page_Load event place the following:

Response.Cache.SetNoServerCaching();
Response.Cache.SetCacheability(System.Web.HttpCach eability.NoCache);
Response.Cache.SetNoStore();
Response.Cache.SetExpires(new DateTime(1900,01,01,00,00,00,00));

This will clear out the Cashe and allow the user to re-visit the child window again.