海友我对Asp下拉列表有疑问 [英] Hai Friends I Have A Question On Asp Drop Down List

问题描述

我将数据库中的数据绑定到下拉列表



喜欢

i'll bind the data from databse to dropdownlist

like

string query = "SELECT id code,country DESCRIPTION description FROM world";
            OracleDataAdapter adpt = new OracleDataAdapter(query, con);
            DataTable dt = new DataTable();
            adpt.Fill(dt);
            DataRow dr = dt.NewRow();
            dr["code"] = 0;
            dr["description"] = "-Select-";
            dt.Rows.InsertAt(dr, 0);
            ddlcounry.DataSource = dt;
            ddlcounry.DataBind();
            ddlcounry.DataTextField = "description";
            ddlcounry.DataValueField = "code";
            ddlcounry.DataBind();  

和aspx页面

and in aspx page

<asp:DropDownList ID="ddlcounry" runat="server" Style="font-size: medium; font-family: 'Times New Roman', Times, serif"

                        TabIndex="1" Width="158px" CssClass="Dropdown">
                    </asp:DropDownList>
                    <asp:RequiredFieldValidator ID="RequiredFieldValidator1" ControlToValidate="ddlcounry"

                        InitialValue="0" runat="server" ErrorMessage="Please select ddlcounry"></asp:RequiredFieldValidator>

当我点击savebtn如果dropdownlist有-select-它会显示警告信息

请告诉我thankssss

when ever i click on savebtn if dropdownlist have -select- it will show alert message
please tell me thankssss

推荐答案

<asp:requiredfieldvalidator id="RequiredFieldValidator1" runat="server" errormessage="Please select the data" controltovalidate="ddlcounry" initialvalue="-Select-" ></asp:requiredfieldvalidator>

在你的ddl代码中加上这个：

In ur ddl code add this one :

ddlcountry.Items.Insert(0, "-Select-");

您好，



尝试以下解决方案：



ASPX HTML：

Hi,

Try below solution:

ASPX HTML:

<asp:DropDownList runat="server" ID="ddlList" CssClass="form-control"> </asp:DropDownList>
<asp:RequiredFieldValidator Display="Dynamic" ID="RequiredFieldValidator3" ErrorMessage="Please select from the list." InitialValue="" ControlToValidate="ddlList" runat="server" />

代码

Code

ddlList.DataSource = objSource;
ddlList.DataTextField = "Description";
ddlList.DataValueField = "Code";
ddlList.DataBind();

ListItem liSelect = new ListItem();
liSelect.Text = "--- Please Select ---";
liSelect.Value = "";

ddlList.Items.Insert(0, liSelect);

这是完全正常工作的代码。

This is fully working code.

set tht initialvalue =' - Select - *'

如下所示

set tht initialvalue ='-Select-*'
like below

<asp:DropDownList ID="ddlcounry" runat="server" Style="font-size: medium; font-family: 'Times New Roman', Times, serif"

                        TabIndex="1" Width="158px" CssClass="Dropdown">
                    </asp:DropDownList>
                    <asp:RequiredFieldValidator ID="RequiredFieldValidator1" ControlToValidate="ddlcounry"

                        InitialValue="-Select-*" runat="server" ErrorMessage="Please select ddlcounry"></asp:RequiredFieldValidator>

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