datalist 中的 CheckBoxList 如何判断当前选了几个选项顶者有分提供实例者可得50分

baiyashan 2008-05-13 11:11:22

我是要完成这样一件事,就是如果一个多选题限制最多只能选N个, 哪么当选题时超出N个时就不能在选择了.
我的checkboxList 是嵌套在datalist里面的.

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liyin_liu 2008-05-16

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GridView和CheckBox结合
http://blog.csdn.net/liyin_liu/archive/2008/05/08/2415145.aspx

LutzMark 2008-05-16

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/// <summary>

		/// 获取页面上已选择的复选框已选择数量

		/// </summary>

		/// <param name="dg">DataGrid实例</param>

		/// <returns>返回一个int已选择复选框的数目</returns>

		public static int GetCheckBoxNum(DataList dg)

		{

			int checkNum = 0;

			int editIndex = 0;

			for (int i = 0; i < dg.Items.Count; i++)

			{

				CheckBox chk = (CheckBox)dg.Items[i].Cells[0].Controls[1];

				if (chk.Checked)

				{

					checkNum = checkNum + 1;

					editIndex = i;

				}

			}

			if (checkNum == 1)

			{

				return checkNum;

			}

			else if (checkNum == 0)

			{

				return -1;

			}

			else

			{

				return checkNum;

			}

		}

baiyashan 2008-05-16

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amandag 同志.你用得 <asp:UpdatePanel /> 控件在我这不好用呀.你用得是 vs05吗?

GengWH 2008-05-14

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for (int i= 0; i < CreateMyDataTable().Rows.Count; i++)
{
rdb_unreg_now = (System.Web.UI.WebControls.RadioButton)DataGrid1.Items[i].Cells[7].Controls[1];
chb_unreg_now1= (System.Web.UI.WebControls.CheckBox)DataGrid1.Items[i].Cells[8].Controls[1];
if(rdb_unreg_now.Checked==true)
{
chb_unreg_now1.Checked=true;
sel_zzid=DataGrid1.Items[i].Cells[0].Text.Trim();
lb_now =(System.Web.UI.WebControls.LinkButton)DataGrid1.Items[i].Cells[1].Controls[1];
zzxm=lb_now.Text.Trim();
}
}

philchang718 2008-05-14

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 gi.ROLE_ID = new System.Collections.Generic.List<int>();

        for (int i = 0; i < this.CheckBoxList1.Items.Count; i++)

        {

            if (this.CheckBoxList1.Items[i].Selected == true)

            {

                gi.ROLE_ID.Add(int.Parse(CheckBoxList1.Items[i].Value));

            }

        }

wxg22526451 2008-05-14

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学习帮顶

Snobish 2008-05-14

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FishFlying1985 2008-05-14

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amandag 2008-05-14

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代码我已经写了,楼主有什么问题?

万小萌 2008-05-14

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通过遍历一个一个判断是否被钩选，可以得到结果

baiyashan 2008-05-14

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还没有决解呢....顶..

xiangyu5945 2008-05-14

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ding xuexi

amandag 2008-05-13

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....

不过看看代码应该查不多的..

baiyashan 2008-05-13

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不好意思,我用得是reqeate

我是要完成这样一件事,就是如果一个多选题限制最多只能选N个, 哪么当选题时超出N个时就不能在选择了.
我的checkboxList 是嵌套在reqeate 里面的.

popeyepower 2008-05-13

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客户端判断,服务端验证.

amandag 2008-05-13

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用Ajax实现的版本



<%@ Page Language="C#" AutoEventWireup="true" CodeFile="DataListDemo.aspx.cs" Inherits="DataListDemo" %>



<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">



<html xmlns="http://www.w3.org/1999/xhtml" >

<head runat="server">

    <title>无标题页</title>

</head>

<body>

    <form id="form1" runat="server">

    <asp:ScriptManager ID="ScriptManager1" runat="server">

    </asp:ScriptManager>    

    <div>

        <asp:DataList ID="DataList1" runat="server" RepeatLayout="Flow">

        <ItemTemplate>

            <%#Eval("OrderID") %>

            <asp:UpdatePanel ID="UpdatePanel1" runat="server" ChildrenAsTriggers="False" RenderMode="Inline" UpdateMode="Conditional">

                <ContentTemplate>

                    <asp:CheckBoxList ID="CheckBoxList1" runat="server" DataSource='<%# GetOrderDetails(Convert.ToInt32(Eval("OrderID"))) %>' DataTextField="UnitPrice" DataValueField="ProductID" RepeatLayout="Flow" RepeatDirection="Horizontal" AutoPostBack="True" OnSelectedIndexChanged="CheckBoxList1_SelectedIndexChanged">

                    </asp:CheckBoxList>                

                </ContentTemplate>

            </asp:UpdatePanel>

        </ItemTemplate>

        </asp:DataList>

        <asp:UpdatePanel ID="UpdatePanel2" runat="server" ChildrenAsTriggers="False" RenderMode="Inline" UpdateMode="Conditional">

        <ContentTemplate>

        <asp:Label ID="Label1" runat="server"></asp:Label>        

        </ContentTemplate>

        </asp:UpdatePanel>

     </div>

    </form>

</body>

</html>



private void BindDataList()

{

    SqlConnection cn = new SqlConnection(@"server=.\SQLExpress;uid=sa;pwd=;database=Northwind");

    SqlDataAdapter da = new SqlDataAdapter("select top 10 orderid, CustomerID, OrderDate from Orders", cn);

    DataSet ds = new DataSet();

    cn.Open();

    da.Fill(ds);

    cn.Close();

    DataList1.DataSource = ds.Tables[0].DefaultView;

    DataList1.DataBind();

}



protected DataTable GetOrderDetails(int orderID)

{

    SqlConnection cn = new SqlConnection(@"server=.\SQLExpress;uid=sa;pwd=;database=Northwind");

    SqlDataAdapter da = new SqlDataAdapter("select ProductID, UnitPrice from [Order Details] where orderid = @orderid", cn);

    da.SelectCommand.Parameters.AddWithValue("@orderid", orderID);

    DataSet ds = new DataSet();

    cn.Open();

    da.Fill(ds);

    cn.Close();

    return ds.Tables[0];

}



protected void Page_Load(object sender, EventArgs e)

{

    if (!IsPostBack)

    {

        BindDataList();

    }

}



protected void CheckBoxList1_SelectedIndexChanged(object sender, EventArgs e)

{

    CheckBoxList chk = sender as CheckBoxList;

    int count = 0;

    foreach (ListItem li in chk.Items)

    {

        if (li.Selected)

        {

            count++;

            if (count >= 3)

            {

                Label1.Text = "Wrong";

                UpdatePanel2.Update();

                break;

            }

            else

            {

                Label1.Text = string.Empty;

                UpdatePanel2.Update();

            }

        }

    }

    ((UpdatePanel)((DataListItem)chk.NamingContainer).FindControl("UpdatePanel1")).Update();

}