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ASP.NET

Posted on 2007-11-26
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Last Modified: 2013-11-26
I have a usercontrol (login.ascx) that gets loaded through the masterpage on load.

There's a submit button on it that I need to make the default button when someone doesn't click on it but just hits the <ENTER> key.  I know I can do that on an ASPX page...but how in a user control?

Thanks
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Question by:lrbrister
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5 Comments
 
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Expert Comment

by:samtran0331
ID: 20350881
This worked for me.
Page_Load is on the master page.
My test user control has a button named "Button1", which I'm setting as the default button on the master page:
<%@ Master Language="VB" %>
 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 
<script runat="server">
 
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)
        Dim ctrl As Control = LoadControl("ucDefaultButton.ascx")
        Dim btn As Button = CType(ctrl.FindControl("Button1"), Button)
        Me.ContentPlaceHolder1.Controls.Add(ctrl)
        Me.form1.DefaultButton = btn.ID
    End Sub
</script>
 
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server" defaultbutton="Button1">
    <div>
        <asp:contentplaceholder id="ContentPlaceHolder1" runat="server">
        </asp:contentplaceholder>
    </div>
    </form>
</body>
</html>

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Author Comment

by:lrbrister
ID: 20351215
samtram0331,
  Trying to figure out why this doesn't work...


 Select Case CStr(Request.Params("page"))
            Case "home"
                Session("info") = " Home Page"
                Dim uc As UserControl = CType(LoadControl("includes/login.ascx"), UserControl)
                Dim btn As Button = CType(uc.FindControl("ImageButton1"), Button)
                ContentPlaceHolder1.Controls.Add(uc)
                Me.form1.DefaultButton = btn.ID
                uc.ID = "uc1"

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LVL 37

Expert Comment

by:samtran0331
ID: 20351331
it looks like you're trying to convert an image button to a button....try changing the line:

Dim btn As Button = CType(uc.FindControl("ImageButton1"), Button)
to
Dim btn As ImageButton = CType(uc.FindControl("ImageButton1"), ImageButton)

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Author Comment

by:lrbrister
ID: 20351497
samtram...It forced me to use the IButton code..below.  But when I load that I'm getting the error message in the attached snippet
Session("info") = "Home Page"
                Dim uc As UserControl = CType(LoadControl("includes/login.ascx"), UserControl)
                Dim btn As IButtonControl = CType(uc.FindControl("ImageButton1"), IButtonControl)
                ContentPlaceHolder1.Controls.Add(uc)
                Me.form1.DefaultButton = btn
                uc.ID = "uc99"
Unable to cast object of type 'System.Web.UI.WebControls.ImageButton' to type 'System.String'. 
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 
 
Exception Details: System.InvalidCastException: Unable to cast object of type 'System.Web.UI.WebControls.ImageButton' to type 'System.String'.
 
Source Error: 
 
 
Line 176:                Dim btn As IButtonControl = CType(uc.FindControl("ImageButton1"), IButtonControl)
Line 177:                ContentPlaceHolder1.Controls.Add(uc)
Line 178:                Me.form1.DefaultButton = btn
Line 179:                uc.ID = "uc99"
Line 180:        End Select
 

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Accepted Solution

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samtran0331 earned 500 total points
ID: 20352351
I don't have the time at the moment to figure out why it won't let you set the defaultbutton in codebehind, but I found that if you wrap the user control in a panel and set the panel's default button, it works...below is a simple uc I'm testing with:
<%@ Control ClassName="ucDefaultButton" Language="VB" %>
 
<script runat="server">
    Protected Sub ImageButton1_Click(ByVal sender As Object, ByVal e As System.Web.UI.ImageClickEventArgs)
        Label1.Text = "Image button clicked! " & Now.ToString & "<br />Textbox: " & TextBox1.Text
    End Sub
</script>
 
<asp:Panel ID="Panel1" runat="server" DefaultButton="ImageButton1">
    <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
    <br />
    <asp:Label ID="Label1" runat="server" Text=""></asp:Label>
    <br />
    <asp:ImageButton ID="ImageButton1" runat="server" ImageUrl="~/Images/disk_green.png" OnClick="ImageButton1_Click" />
    </asp:Panel>

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