Still celebrating National IT Professionals Day with 3 months of free Premium Membership. Use Code ITDAY17

Solved

ASP.NET

Posted on 2007-11-26

1 solution

Medium Priority

205 Views

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

Comment

Question by:lrbrister

[X]

Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

Help others & share knowledge
Earn cash & points
Learn & ask questions

Join The Community

5 Comments

LVL 37

Expert Comment

by:samtran0331

ID: 203508812007-11-26

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>

Open in new window

Author Comment

by:lrbrister

ID: 203512152007-11-26

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"

Open in new window

LVL 37

Expert Comment

by:samtran0331

ID: 203513312007-11-26

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)

Author Comment

by:lrbrister

ID: 203514972007-11-26

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

Open in new window

LVL 37

Accepted Solution

by:samtran0331

samtran0331 earned 2000 total points

ID: 203523512007-11-26

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>

Open in new window

Featured Post

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Finding Control that causes PostBack Made Simple

Article by: kak_mca

IntroductionWhile developing web applications, a single page might contain many regions and each region might contain many number of controls with the capability to perform postback. Many times you might need to perform some action on an ASP.NET po…

ASP.NET

5 Common Exceptions in .NET (and How to Resolve Them)

Article by: käµfm³d 👽

Many of us here at EE write code. Many of us write exceptional code; just as many of us write exception-prone code. As we all should know, exceptions are a mechanism for handling errors which are typically out of our control. From database errors, t…

.NET Programming

Some Basic Differences Between MySQL and MongoDB

Video by: Percona

In this video, Percona Solutions Engineer Barrett Chambers discusses some of the basic syntax differences between MySQL and MongoDB. To learn more check out our webinar on MongoDB administration for MySQL DBA: https://www.percona.com/resources/we…

[Webinar] Multi-Vector Protection from Cyber attacks

Video by: Experts Exchange

We’ve all felt that sense of false security before—locking down external access to a database or component and feeling like we’ve done all we need to do to secure company data. But that feeling is fleeting. Attacks these days can happen in many w…