one dropdown list affecting another dropdown list vb.net
I am desgining a website using VB.NET wherein the data items of one dropdown list depends on the selection of a data item in the previous dropdown list
something similar to selection of country USA from 1st dropdown list...triggers 2nd dropdown with list of states in USA
How can this be accomplished....
Any help will be appreciated...
Thanks & Best Regards...
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ramkunchur
6/18/2008 7:16:20 AM
asp.net.getting-started
91979 articles. 
4 followers.
5 Replies
1177 Views
hi boy,
first I suggest turn on auto postback on first dropdownlist. In select index changes(first dropdownlist) - select value on second dropdownlist
My blog is here.
Please remember to 'Mark as Answer' if this post answered your question!
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ivanatanasov
6/18/2008 7:55:24 AM
Hi,
One what i want to know is that ..are fetching the data of both dropdownlists from database or just putting it manually....
If using Manually, then check the below sample code.
protected void drplst1_SelectedIndexChanged(object sender, EventArgs e)
{
if (drplst1.SelectedItem.Text == "USA")
{
drplst2.Visible = true;
drplst2.SelectedItem.Text = "California";}
else
{
//Do something
}
}Hope this helps.....
Click "Mark As Answer" if it helped you.
TALIB ALI KHAN
MCTS
Welcome to TALIB's World
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Talib_dotnet
6/18/2008 8:05:19 AM
hi...thanks for the reply...
I want to do the above operation by using AJAX
also, I am using SQL database tables to populate data in both the dropdownlists....
How do I implement it?
Thanks again.
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ramkunchur
6/18/2008 8:57:51 AM
Hi,
Check this out for implementing it with a database...
http://www.asp.net/AJAX/AjaxControlToolkit/Samples/Walkthrough/CCDWithDB.aspx
Hope this helps....
Click "Mark As Answer" if it helped you.
TALIB ALI KHAN
MCTS
Welcome to TALIB's World
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Talib_dotnet
6/18/2008 9:08:43 AM
Hi,
Firstly, you can fill with a mutiple level array to generate a client dropdownlist.
Please check this: http://forums.asp.net/t/1198683.aspx
It will generate all the information to the client at once time.
You can also use AJAX UpdatePanel to achieve it directly, please install the 'ASP.NET 2.0 AJAX Extensions 1.0': http://www.microsoft.com/downloads/details.aspx?FamilyID=ca9d90fa-e8c9-42e3-aa19-08e2c027f5d6&displaylang=en
HTML:
<asp:ScriptManager ID="ScriptManager1" runat="server"> </asp:ScriptManager> <asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="true" onselectedindexchanged="DropDownList1_SelectedIndexChanged"> <asp:ListItem>Please Select</asp:ListItem> <asp:ListItem>item1</asp:ListItem> <asp:ListItem>item2</asp:ListItem> </asp:DropDownList> <asp:UpdatePanel ID="UpdatePanel1" runat="server"> <ContentTemplate> <asp:DropDownList ID="DropDownList2" runat="server"> <asp:ListItem>Please Select</asp:ListItem> </asp:DropDownList> </ContentTemplate> <Triggers> <asp:AsyncPostBackTrigger ControlID="DropDownList1" EventName="SelectedIndexChanged" /> </Triggers> </asp:UpdatePanel>Code Behind:
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e) { DropDownList2.Items.Clear(); DropDownList2.Items.Add("Please Select"); if (DropDownList1.SelectedIndex == 1) { DropDownList2.Items.Add("item1_1"); DropDownList2.Items.Add("item1_2"); } else if (DropDownList1.SelectedIndex == 2) { DropDownList2.Items.Add("item2_1"); DropDownList2.Items.Add("item2_2"); } }Hope it helps.
Vince Xu
Microsoft Online Community Support
Please remember to mark the replies as answers if they help and unmark them if they provide no help.
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Vince
6/20/2008 3:07:25 AM
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