Question

我正在努力将以前上课的学生提升为新课程。为此，我使用gridview和checkboxes来选择学生，并使用新班级仅更新数据库中选定的学生详细信息。

问题在于，当我单击提升时，只有第一行的详细信息会更新到新类，其余的则没有。即使我正在使用foreach，所以所有选定的学生都会得到更新。

我的输出如下：

促销后我的桌子：

这是我的aspx标记：

<asp:Content ID="Content1" ContentPlaceHolderID="head" runat="Server">
    <script type = "text/javascript">
function checkAll(objRef)
{
    var GridView = objRef.parentNode.parentNode.parentNode;
    var inputList = GridView.getElementsByTagName("input");
    for (var i=0;i<inputList.length;i++)
    {
        //Get the Cell To find out ColumnIndex
        var row = inputList[i].parentNode.parentNode;
        if(inputList[i].type == "checkbox"  && objRef != inputList[i])
        {
            if (objRef.checked)
            {
                //If the header checkbox is checked, check all checkboxes
                inputList[i].checked=true;
            }
            else
            {
                //If the header checkbox is unchecked, uncheck all checkboxes
                inputList[i].checked=false;
            }
        }
    }
}
</script>
    <script type="text/javascript">
   var TargetBaseControl = null;

   window.onload = function()
   {
      try
      {
         //get target base control.
         TargetBaseControl = 
           document.getElementById('<%= this.GridView1.ClientID %>');
      }
      catch(err)
      {
         TargetBaseControl = null;
      }
   }

   function TestCheckBox()
   {              
      if(TargetBaseControl == null) return false;

      //get target child control.
      var TargetChildControl = "chkPromote";
      var TargetChildControlAll = "chkboxSelectAll";

      //get all the control of the type INPUT in the base control.
      var Inputs = TargetBaseControl.getElementsByTagName("input"); 

      for(var n = 0; n < Inputs.length; ++n)
         if(Inputs[n].type == 'checkbox' && Inputs[n].id.indexOf(TargetChildControl,0) >= 0 && Inputs[n].checked || Inputs[n].type == 'checkbox' && Inputs[n].id.indexOf(TargetChildControlAll, 0) >= 0 &&
            Inputs[n].checked)
          return true;        

      alert('Select at least one student!');
      return false;
   }
</script>
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="Server">
    <div class="content-wrapper">
        <section class="content-header">
            <h1>Student Promotion
        <small>Administrator</small>
            </h1>
            <ol class="breadcrumb">
                <li><a href="#"><i class="fa fa-dashboard"></i>Home</a></li>
                <li class="active">Student Promotion</li>
            </ol>
        </section>
        <section class="content">
            <div class="box box-danger">
                <div class="box-header with-border">
                    <h3 class="box-title">Student Promotion Manager</h3>
                </div>
                <div class="box-body">
                    <div class="col-md-6">
                        <div class="form-group">
                            <label>Select Standard You Wanna Promote</label>
                            <asp:DropDownList ID="drpclass" runat="server" CssClass="btn btn-default form-control" OnSelectedIndexChanged="drpclass_SelectedIndexChanged" AutoPostBack="true"></asp:DropDownList>
                        </div>
                    </div>
                    <div class="col-md-12" style="overflow: scroll; height: 200px">
                        <div class="form-group">
                            <asp:GridView ID="GridView1" runat="server" CssClass="table table-bordered table-condensed table-hover table-responsive"
                                GridLines="None">
                                <Columns>
                                    <asp:TemplateField>
                                        <HeaderTemplate>
                                            <asp:CheckBox ID="chkboxSelectAll" AutoPostBack="true" OnCheckedChanged="checkmobilenumbers"  runat="server" onclick="checkAll(this);" />
                                        </HeaderTemplate>
                                        <ItemTemplate>
                                            <asp:CheckBox ID="chkPromote" runat="server"  OnCheckedChanged="checkmobilenumbers" />
                                        </ItemTemplate>
                                    </asp:TemplateField>
                                    <asp:TemplateField HeaderText="Sl. No.">
                                        <ItemTemplate>
                                            <%#Container.DataItemIndex + 1 %>
                                        </ItemTemplate>
                                    </asp:TemplateField>
                                </Columns>
                            </asp:GridView>
                        </div>
                    </div>
                </div>
                <div class="box-footer">
                    <div class="pull-right">
                        <asp:Button ID="btnPromote" runat="server" CssClass="btn btn-default" OnClientClick="javascript:return TestCheckBox();" Text="Promote Selected Students" OnClick="PromoteSelectedStudents" />
                    </div>
                </div>
            </div>
        </section>
    </div>
</asp:Content>

这是我的c＃代码背后：

protected void PromoteSelectedStudents(object sender, EventArgs e)
{
    if (drpclass.SelectedIndex.ToString() != "0")
    {
        try
        {
            foreach (GridViewRow row in GridView1.Rows)
            {
                //if eligible start promote process                    
                CheckBox chkRow = (CheckBox)row.FindControl("chkPromote");
                //bool isSelected = (row.FindControl("chkPromote") as CheckBox).Checked;
                if (chkRow.Checked)
                {
                    string nowDate = DateTime.Now.AddDays(365).ToString();
                    string classdrp = drpclass.SelectedItem.ToString();
                    //Int16 clsupdt = Convert.ToInt16(classdrp + 1);
                    string Student = row.Cells[4].Text.Trim();
                    string dateCreated = DateTime.Now.ToShortDateString();
                    con.Open();
                    cmd.Connection = con;
                    cmd.CommandText = "update studentregistration set class = (Select promotable_to from addclass where classname = '" + classdrp + "'), LastPromotedOn = convert(varchar, GETDATE(), 103), NextPossiblePromotion = DATEADD(year, 1, NextPossiblePromotion) where class = '" + classdrp + "' and name = '" + Student + "'";
                    int i = cmd.ExecuteNonQuery();
                    if (i > 0)
                    {
                        message = "Selected Students are promoted to the new class & the next promotion date is: " + nowDate;
                        script += message;
                        script += "')};";
                        ClientScript.RegisterStartupScript(this.GetType(), "Message From St.Joseph", script, true);
                        ga.bindClassDropDown(drpclass);
                        GridView1.DataSource = "";
                        GridView1.DataBind();
                    }
                    con.Close();
                }

            }
        }
        catch (Exception ex)
        {
            Response.Write("<script language='javascript'>alert('" + Server.HtmlEncode(ex.Message.ToString()) + "')</script>");
        }
    }
    string strConnString = ConfigurationManager.ConnectionStrings["stjosephconnect"].ConnectionString;
}

Answer 1

更新第一行后，如果需要重置，请在循环GridView1内重置GridView1.DataSource = ""; GridView1.DataBind();数据源。在完成所有学生更新后，请在循环外执行此操作。

if (i > 0)
{
    message = "Selected Students are promoted to the new class & the next promotion date is: " + nowDate;
    script += message;
    script += "')};";
    ClientScript.RegisterStartupScript(this.GetType(), "Message From St.Joseph", script, true);
    ga.bindClassDropDown(drpclass);
    // Below two lines are the issue you need to remove them or move them outside foreach
    GridView1.DataSource = "";
    GridView1.DataBind();
}

无法使用c＃ASP.NET

1 个答案: