<%@ Page Language="C#" %> <html xmlns="http://www.w3.org/1999/xhtml"> <head id="Head1" runat="server"> <title></title> <script runat="server"> protected void SelectSubCategoies(object sender, EventArgs e) { string s = this.ddlCategories.SelectedValue; this.ddlSubcategories.Items.Clear(); if (s.Equals("-1")) this.ddlSubcategories.Enabled = false; else { this.ddlSubcategories.Enabled = true; for (int i = 0; i < 10; i++) this.ddlSubcategories.Items.Add(new ListItem(s + " Sub Cateogry")); } } </script> </head> <body> <form id="form1" runat="server"> <asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager> <asp:UpdatePanel runat="server" ID="upnlCascadeDropdown"> <ContentTemplate> <asp:DropDownList runat="server" ID="ddlCategories" AutoPostBack="true" OnSelectedIndexChanged="SelectSubCategoies"> <asp:ListItem Value="-1">Select</asp:ListItem> <asp:ListItem Value="A">Category A</asp:ListItem> <asp:ListItem Value="B">Category B</asp:ListItem> <asp:ListItem Value="C">Category C</asp:ListItem> <asp:ListItem Value="D">Category D</asp:ListItem> </asp:DropDownList> <asp:DropDownList runat="server" ID="ddlSubcategories" Enabled="false"></asp:DropDownList> </ContentTemplate> </asp:UpdatePanel> </form> </body> </html>
Saturday, July 10, 2010
How to bulid a simple cascade dropdownlist - Asp.net
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