Depending Dropdowns : DropDownList « Asp Control « ASP.Net

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ASP.Net » Asp Control » DropDownList 
Depending Dropdowns

<%@ Page Language="vb" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
  <HEAD>
    <title>Depending Dropdowns</title>
  </HEAD>
  <script runat="server">
         Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgsHandles MyBase.Load
             If Not IsPostBack Then
                 countryList.Items.Clear()
                 countryList.Items.Add(New ListItem("- Make a selection -"))
                 countryList.Items.Add(New ListItem("A""B"))
                 countryList.Items.Add(New ListItem("B""F"))
             End If
         End Sub

         Private Sub SelectedIndexChangedEventHandler(ByVal sender As System.Object, ByVal e As System.EventArgs)
             cityList.Items.Clear()
             If countryList.SelectedItem.Value = "B" Then
     
                 cityList.Items.Add(New ListItem("A1"))
                 cityList.Items.Add(New ListItem("A2"))
                 cityList.Items.Add(New ListItem("A3"))
             ElseIf countryList.SelectedItem.Value = "F" Then
                 cityList.Items.Add(New ListItem("B1"))
                 cityList.Items.Add(New ListItem("B2"))
                 cityList.Items.Add(New ListItem("B3"))
             End If
     
         End Sub
  </script>
  <body>
    <form id="Form1" method="post" runat="server">
      <asp:DropDownList id="countryList" runat="server" AutoPostBack="True" OnSelectedIndexChanged="SelectedIndexChangedEventHandler"></asp:DropDownList>
      <asp:DropDownList id="cityList" runat="server"></asp:DropDownList>
    </form>
  </body>
</HTML>

 
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