Question

获取下拉列表作为输出后，在下拉列表中选择用户时，我没有获得相关表单？检查code.i使用面板控件3个用户详细信息表 protected void Page_Load（object sender，Eventargs e） {

        if (!IsPostBack)
        {
            AdminPanel.Visible = false;
            TeacherPanel.Visible = false;
            StudentPanel.Visible = false;
        }
    }
    protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
    {
        if (DropDownList1.SelectedValue == "-1")
        {
            AdminPanel.Visible = false;
            TeacherPanel.Visible = false;
            StudentPanel.Visible = false;
        }
        else if (DropDownList1.SelectedValue == "admin")
        {
            AdminPanel.Visible = true;
            TeacherPanel.Visible = false;
            StudentPanel.Visible = false;
        }
        else if (DropDownList1.SelectedValue == "teacher")
        {
            AdminPanel.Visible = false;
            TeacherPanel.Visible = true;
            StudentPanel.Visible = false;
        }
        else
        {
            AdminPanel.Visible = false;
            TeacherPanel.Visible = false;
            StudentPanel.Visible = true;
        }
    }

Answer 1

你的问题没有提供足够的信息，但让我一起摇摆，因为这是人们对DropDownList的常见错误。

如果要在选择DropDownList后将表单发回服务器，则需要设置AutoPostBack="True"。

<asp:DropDownList 
    ID="DropDownList1" 
    runat="server"
    AutoPostBack="True"
    OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged">
</asp:DropDownList>

我没有使用面板控件获取下拉列表值相关表单

1 个答案: