CheckBoxList Web Control

Prerequisites

Lecture – Getting Started in Visual Studio

Summary

Part 1 -The basics of how a CheckBoxList handles indexes

Part 2 – How to retrieve and set values in a CheckBoxList

Video

Part 1 – http://online1.daytonastate.edu/player2.php?id=82ca5dd156cc926b2992f73c2896f761

Part 2 – http://online1.daytonastate.edu/player2.php?id=55a988dfb00a914717b3000a3374694c

Reference Materials

<body> <form id=”form1″ runat=”server”> <div> <table><tr> <td> <asp:CheckBoxList ID=”cblMain” runat=”server” onselectedindexchanged=”cblMain_SelectedIndexChanged” AutoPostBack=”True”> <asp:ListItem>AUTO</asp:ListItem> <asp:ListItem>MC</asp:ListItem> <asp:ListItem>BICYCLE</asp:ListItem> <asp:ListItem>FALL</asp:ListItem> <asp:ListItem>GSW</asp:ListItem> <asp:ListItem>HELMET</asp:ListItem> <asp:ListItem>OTHER</asp:ListItem> </asp:CheckBoxList> </td> <td > <asp:CheckBoxList ID=”cblAuto” runat=”server” Visible=”false”> <asp:ListItem>Driver</asp:ListItem> <asp:ListItem>Passenger</asp:ListItem> <asp:ListItem>Pedestrian</asp:ListItem> <asp:ListItem>Airbag</asp:ListItem> </asp:CheckBoxList> <asp:CheckBoxList ID=”cblHelmet” runat=”server” Visible=”false”> <asp:ListItem>None</asp:ListItem> <asp:ListItem>1/2</asp:ListItem> <asp:ListItem>3/4</asp:ListItem> <asp:ListItem>Full</asp:ListItem> </asp:CheckBoxList> </td> </tr> </table> </div> <asp:Label ID=”Label1″ runat=”server” Text=”Label”></asp:Label> <asp:Label ID=”Label2″ runat=”server” Text=”Label”></asp:Label> </form></body>

protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { string s = “AUTO;HELMET;GSW”; string[] t = s.Split(new Char[] { ‘;’, ‘,’ }); foreach (string u in t) { for (int i = 0; i < cblMain.Items.Count; i++) if (u.Trim() == cblMain.Items[i].Value) cblMain.Items[i].Selected = true; } } } protected void cblMain_SelectedIndexChanged(object sender, EventArgs e) { if (cblMain.Items[0].Selected) cblAuto.Visible = true; else cblAuto.Visible = false; if (cblMain.Items[5].Selected) cblHelmet.Visible = true; else cblHelmet.Visible = false; string s = String.Empty; for (int j = 0;j<cblMain.Items.Count; j++) { if (cblMain.Items[j].Selected) s += cblMain.Items[j].Value + “;”; } Label1.Text = s; }

Additional Information

All about the CheckBoxList Control – http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.checkboxlist.aspx

The String Split method demonstrated in the Video 2 – http://msdn.microsoft.com/en-us/library/y7h14879