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Visual Basic - How do I make a Panel that is not visible when the program...

Visual Basic - How do I make a Panel that is not visible when the program runs become visible when a DropDownList selects an item.

The first item on the list should be "Select Option" which leaves the Panel as not visible. The second item should be "North" and when it is selected, the Panel should appear and a Label on the Panel should say "North Location". The third item should be "South" and when it is selected, the Panel should appear as well and the Label should say "South Location.

I have tried the code below and it does not make the panel appear.

Protected Sub DropDownList1_SelectedIndexChanged1(sender As Object, e As EventArgs) Handles DropDownList1.SelectedIndexChanged
Panel1.Visible = True

NOR

If DropDownList1.SelectedIndex = 1 Then

Panel1.Visible=True

End If


End Sub

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Homework Answers

Answer #1

Dear Student ,

As per requirement submitted above kindly find below solution.

Here new asp,net web application in VB is created using visual studio 2019 with name "WebApplication1". This application contains a web form with name "WebForm1.aspx".Below is the details of this web form.

NOTE :Hre AutoPostBack property for dropdown is need to set as true.

WebForm1.aspx :

<%@ Page Language="vb" AutoEventWireup="false" CodeBehind="WebForm1.aspx.vb" Inherits="WebApplication1.WebForm1" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True">
<asp:ListItem>Select Option</asp:ListItem>
<asp:ListItem>North</asp:ListItem>
<asp:ListItem>South</asp:ListItem>
</asp:DropDownList>
<br />
<br />
</div>
<asp:Panel ID="Panel1" runat="server" Visible="False">
<asp:Label ID="lblHeader" runat="server"></asp:Label>
</asp:Panel>
</form>
</body>
</html>

************************************

WebForm1.aspx.cs :

Public Class WebForm1 'VB Class
Inherits System.Web.UI.Page

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

End Sub
'DropDownList1 selected index changed
Protected Sub DropDownList1_SelectedIndexChanged(sender As Object, e As EventArgs) Handles DropDownList1.SelectedIndexChanged
'checking which index is selected
If DropDownList1.SelectedIndex = 1 Then
Panel1.Visible = True 'make panel visible
lblHeader.Text = "North Location" 'set text to the label
ElseIf DropDownList1.SelectedIndex = 2 Then
Panel1.Visible = True 'make panel visible
lblHeader.Text = "South Location" 'set text to the label
Else
Panel1.Visible = False 'do not show the panel
lblHeader.Text = "" 'set empty text to the label
End If
End Sub
End Class

==================================

Output :Run application using F5 and will get the screen as shown below

Screen 1:WebForm1.aspx

Screen 2:WebForm1.aspx, screen when North is selected

Screen 3:WebForm1.aspx, screen when South is selected

NOTE :PLEASE FEEL FREE TO PROVIDE FEEDBACK ABOUT THE SOLUTION.

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