如何在复选框列表中获取当前选中的复选框索引 [英] how to get currect selected checkbox index in checkboxlist

问题描述

在我的复选框列表中有一些类，如1-b.tech（cse）2-b.tech（it）3-b.tech（ece）4-b.tech（me）当我选择b.tech（ ece）它给出b.tech（ece）的正确classid然后我选择b.tech（me）它再次给b.tech（我）的classid如果我选择b.tech（it）或b.tech（ cse）然后它给出正确的classid。基本上它选择了cleckbox列表中第一个选定的classid。如何在每个选择中选择当前选定的classid？





1-b.tech（cse）2-b.tech（它）3-b.tech（ece）4-b.tech（我）



i我正在使用此代码 -



asp.net代码 -

 <   td  >  <   b  > 类：<   / b  >  <   / td  >  
 <   td  >  <   asp：CheckBoxList     ID   =  CheckBoxList1    runat   =  server      AutoPostBack   =  true  
   
                                   RepeatDirection   = < span class =code-keyword>水平    DataSourceID   =  SqlDataSource1  
   
                                   DataTextField   = 类    DataValueField   =  classesid >  
 <   / asp：CheckBoxList  >  
 <   / td  >  

vb.net代码 -

 受保护的  Sub  CheckBoxList1_Sel ectedIndexChanged（ ByVal  sender 作为 对象，< span class =code-keyword> ByVal  e  As  System.EventArgs）句柄 CheckBoxList1 .SelectedIndexChanged 
 
  Dim  c  As  字符串 
  Dim  d 作为 字符串 
  Dim  f 作为 字符串 
 
 
 对于 i  As  < span class =code-keyword>整数 =  0    CheckBoxList1.Items.Count -   1  
 
 如果 CheckBoxList1.Items（i）.Selected 那么 
 
 
 cmd.CommandText =  从classesid =& CheckBoxList1.SelectedValue&   
c = cmd.ExecuteScalar 
 
 Label1.Text = c 
 
 
 cmd.CommandText =  从stu选择计数（studentid） classesid =& CheckBoxList1.SelectedValue&   
d = cmd.ExecuteScalar 
 Label2.Text = d 
 
 cmd.CommandText =  从矩阵中选择count（*），其中classesid =& ; CheckBoxList1.SelectedValue&   
f = cmd.ExecuteScalar 
 Label3.Text = f 
 
 Label4.Text =  CInt （Label2.Text） -   CInt （Label3.Text） 
 
 否则 
 
 结束 如果 
 下一步 
 
 
 结束  Sub  
 结束 类 

解决方案

  string  result = Request.Form [  __ EVENTTARGET]; 
  string  [] checkedBox = result.Split（'  

）; ;
int index = int .Parse（checkedBox [checkedBox.Length - 1 ]）;

if （cbYears.Items [index] .Selected）
{
// 您的逻辑
}
其他
{
// 您的逻辑
}

  protected   void  CheckBoxList1_SelectedIndexChanged（ object  sender，EventArgs e）
 {
  string   value  =  string  .Empty; 
 
  string  result = Request.Form [  __ EVENTTARGET]; 
 
  string  [] checkedBox = result.Split（'  

in my checkboxlist there are some classes like 1-b.tech(cse) 2-b.tech(it) 3-b.tech(ece) 4-b.tech(me) when i select b.tech(ece) it give the correct classid of b.tech(ece) and then i select b.tech(me) it give the classid of b.tech(me) again if i select b.tech(it) or b.tech(cse) then it give right classid. basically it pick the first selected classid in cleckbox list. how can i pick the current selected classid on each selection?


1-b.tech(cse) 2-b.tech(it) 3-b.tech(ece) 4-b.tech(me)

i am using this code--

asp.net code-

<td><b>Class:</b></td>
                <td><asp:CheckBoxList ID="CheckBoxList1" runat="server"  AutoPostBack="true"

                RepeatDirection="Horizontal" DataSourceID="SqlDataSource1"

                DataTextField="classes" DataValueField="classesid">
                </asp:CheckBoxList>
                </td>

vb.net code--

Protected Sub CheckBoxList1_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles CheckBoxList1.SelectedIndexChanged

        Dim c As String
        Dim d As String
        Dim f As String


        For i As Integer = 0 To CheckBoxList1.Items.Count - 1

            If CheckBoxList1.Items(i).Selected Then


                cmd.CommandText = "select classes from classes where classesid=" & CheckBoxList1.SelectedValue & ""
                c = cmd.ExecuteScalar

                Label1.Text = c


                cmd.CommandText = "select count(studentid) from stu where classesid=" & CheckBoxList1.SelectedValue & ""
                d = cmd.ExecuteScalar
                Label2.Text = d

                cmd.CommandText = "select count(*) from matrix where classesid=" & CheckBoxList1.SelectedValue & ""
                f = cmd.ExecuteScalar
                Label3.Text = f

                Label4.Text = CInt(Label2.Text) - CInt(Label3.Text)

            Else

            End If
        Next


    End Sub
End Class

解决方案

string result = Request.Form["__EVENTTARGET"];
string [] checkedBox = result.Split('

'); ; int index = int.Parse(checkedBox[checkedBox.Length - 1]); if (cbYears.Items[index].Selected) { //your logic } else { //your logic }

protected void CheckBoxList1_SelectedIndexChanged(object sender, EventArgs e)
        {
            string value = string.Empty;

            string result = Request.Form["__EVENTTARGET"];

            string[] checkedBox = result.Split('

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