问题下拉事件onselectedIndexChange [英] problem dropdown event onselectedIndexChange

问题描述

亲爱的所有人，

我的.aspx页在下面给出..

Dear all,

my .aspx page given below..

<table class="style1">
    <tr>
        <td>
            <asp:DropDownList ID="Ddl" runat="server"

                onselectedindexchanged="Ddl_SelectedIndexChanged">
                <asp:ListItem Value=0 Selected="True">------Select-----</asp:ListItem>
                <asp:ListItem Value=1>National Sales Manager</asp:ListItem>
                <asp:ListItem Value=2>Regional Manager</asp:ListItem>
            </asp:DropDownList>
            <asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Button" />
        </td>
        <td>
            &nbsp;</td>
    </tr>
    <tr>
        <td>
            <asp:CheckBoxList ID="CheckBoxList1" runat="server" Height="66px" Width="689px">
            </asp:CheckBoxList>
        </td>
        <td>
            &nbsp;</td>
    </tr>
</table>

----和我的aspx.cs页面---

----and my aspx.cs page ---

public partial class Test : System.Web.UI.Page
{
    SqlConnection ConnDeemah = new SqlConnection();
    public string Cmd = "";
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
           // BindCheckboxList();
        }
        
            
        }
    public void BindCheckboxList()
    {
        string connectionString = (string)ConfigurationSettings.AppSettings["ConnectionString"];
        ConnDeemah.ConnectionString = connectionString;
        ConnDeemah.Open();
        SqlDataReader nsmDr;
        Cmd = "SELECT Convert(varchar, NSM.NationalSalesManagerCode)+ '' - '' + NSM.NationalSalesManagerName + '' / '' + C.CountryName As NationalSalesManagerName, NSM.NationalSalesManagerCode FROM NationalSalesManager NSM INNER JOIN Country C ON NSM.NationalSalesManagerCode = C.NationalSalesManagerCode ORDER BY NationalSalesManagerName";
        SqlCommand RCMD = new SqlCommand(Cmd, ConnDeemah);
        nsmDr = RCMD.ExecuteReader(CommandBehavior.CloseConnection);
        CheckBoxList1.DataSource = nsmDr;
        CheckBoxList1.DataTextField = "NationalSalesManagerName";
        CheckBoxList1.DataValueField = "NationalSalesManagerCode";
        CheckBoxList1.DataBind();
    }
protected void Ddl_SelectedIndexChanged(object sender, EventArgs e)
    {


    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        if (Ddl.SelectedValue == "1")
        {
            CheckBoxList1.Visible = true;
            BindCheckboxList();
        }
        else if (Ddl.SelectedValue == "2")
        {
            CheckBoxList1.Visible = true;
            BindCheckboxList();
        }
    }

上面的代码正常工作，但是我不想在按钮单击事件上填写复选框列表，当我将按钮事件代码放在Ddl_SelectedIndexChanged事件的块中时，它确实会填充复选框列表.

因此，请有人帮助我.................

the above code is working properly ,but I don''t want to fill the checkboxlist on button click event,when I put button event code in the block of Ddl_SelectedIndexChanged event then it does populate the checkboxlist.

so please somebody help me.................

推荐答案

将dropdownlist的AutoPostBack属性设置为TRUE.

Set AutoPostBack property of dropdownlist to TRUE.

<asp:DropDownList ID="Ddl" runat="server" AutoPostBack="true"

                onselectedindexchanged="Ddl_SelectedIndexChanged">
                <asp:ListItem Value=0 Selected="True">------Select-----</asp:ListItem>
                <asp:ListItem Value=1>National Sales Manager</asp:ListItem>
                <asp:ListItem Value=2>Regional Manager</asp:ListItem>
            </asp:DropDownList>

这篇关于问题下拉事件onselectedIndexChange的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！