datalist与checkbox判断问题

Question

1.datalist中放入1个checkbox,共7条数据,也就是显示7个checkbox,如何判断只选中其中的4个?
2.如何得到当前所选中的checkbox的值?

Answer 1

11.checkbox

//checkbox验证
public bool IsCHBValid()
{
bool flag=false;
string sort="";
foreach(ListItem i in this.CheckBoxList1.Items)
{
if(i.Selected==true)
{
sort+=i.Value;
}
} if( sort!="" )
{
flag=true;
}
return flag;
}

Answer 2

在Button的click事件下:
    protected void Button1_Click(object sender, EventArgs e)
    {
        int a=0;
        for (int i = 0; i < DataList1.Items.Count; i++)
        {
            if (((CheckBox)DataList1.Items[i].FindControl("CheckBox1")).Checked==true)
                a += 1;
        }
        if(a==4)
            Response.Write("你选中了4项!!");
    }

Answer 3

在每一个checkbox的click事件添加如下代码bool status=CheckStatus();
if(!status)
{
this.checkbox1.checked=false;
}
在类中添加如下代码private bool CheckStatus()
{
int a=0;
for (int i = 0; i < DataList1.Items.Count; i++) 
        { 
            if (((CheckBox)DataList1.Items[i].FindControl("CheckBox1")).Checked==true) 
                a += 1; 
        } 
        if(a==4) 
            return false;
return ture; }

Answer 4

 <asp:CheckBox ID="single_Chk"  name="selectAll" runat="server" />
 <asp:HiddenField  ID="commentid" Value='<%#Eval("commentid")%>' runat="server"/>  
//删除选中的数据。可全删除。全选根据ID删除
    protected void delWriteLog_Click(object sender, ImageClickEventArgs e)
    {
        sqlt.SetSQLBeginTrans();
        try
        {
            for (int i = 0; i < rpMyReceiveComment.Items.Count; i++)
            {
                CheckBox CB = (CheckBox)rpMyReceiveComment.Items[i].FindControl("single_Chk");
                if (CB.Checked == true)
                {
                    string delID = ((HiddenField)rpMyReceiveComment.Items[i].FindControl("commentid")).Value;
                    cookies = Request.Cookies["UserCookies"];
                    if (cookies != null)
                    {
                        int uid = int.Parse(cookies["User_Uid"].ToString());//
                        sqlt.Operate("update a set a.delstate=1 from dbo.space_MyComments a inner join dbo.space_MyReleased b on a.logid=b.logid  where a.commentid=" + delID + " and b.uid=" + uid);
                    }
                 }
            } sqlt.SetSQLCommitTrans(); sqlt.ConClose();
        }
        catch
        {
            sqlt.SetSQLRollBack(); sqlt.ConClose(); base.MessageBox("00006", null);
        }
        this.PageFen();
    }

Answer 5

选中任意四项，点击事件然后循环得到选中的值 for (int i = 0; i < rpMyReceiveComment.Items.Count; i++)
            {
                CheckBox CB = (CheckBox)rpMyReceiveComment.Items[i].FindControl("single_Chk");
                if (CB.Checked == true)
                {
                    string delID = ((HiddenField)rpMyReceiveComment.Items[i].FindControl("commentid")).Value;//选中的四项值
                }
            }

Answer 6

单个选择，再循环判断。
foreach ( DataListItem item in DataList1.Items )
{
CheckBox chk = (CheckBox) item.FindControl("CheckBox1");
if(chk.Checked)
{
}
}

Answer 7

这是不可能滴!!
一般的错误是id错!!你看是否打错了!!
 if (((CheckBox)DataList1.Items[i].FindControl("CheckBox1")).Checked==true) 

Answer 8

 protected void CheckBoxList2_SelectedIndexChanged(object sender, EventArgs e)
        {            for (int i = 0; i < shu; i++)
            {
                if (CheckBoxList2.Items[i].Selected)
                {
                    s1 = s1 + CheckBoxList2.Items[i].Text + ",";                }            }
             Label10.Text = s1 ;
            Label6.Text = Label10.Text + Label11.Text;
            string str1 = Label6.Text.ToString();
            string[] astr = str1.Split(',');
            intCnt = astr.Length - 1;
            if (intCnt > shu)
            {
                Response.Write("<script>alert('最多只能选"+shu+"个')</script>");
                Response.AddHeader("refresh", "0");
            }
        }        public void panduan()
        {
            for (int i = 0; i < shu; i++)
            {
                if (CheckBoxList2.Items[i].Selected)
                {
                    s1 = s1 + CheckBoxList2.Items[i].Text + ",";                }            }
            Label10.Text = s1;
            Label6.Text = Label10.Text + Label11.Text;
            string str1 = Label6.Text.ToString();
            string[] astr = str1.Split(',');
            intCnt = astr.Length - 1;
            if (intCnt > shu)
            {
                Response.Write("<script>alert('最多只能选" + shu + "个')</script>");
                Response.AddHeader("refresh", "0");
            }
        }