下拉列表默认值 [英] dropdownlist default value

问题描述

早上好



i在gridview.i中有一个下拉列表我将它绑定到我有一些价值的数据库。



当我运行程序时，它显示默认值为--Select--



但是我想看到默认项目已经选好了。



请帮帮我。



谢谢。

解决方案

这是我以前的问题

试着看这里



分配下拉列表文本值 [ ^ ]

您好，



使用以下代码，

 <   asp：DataGrid   
   
           id   =  DataGrid1   < span class =code-attribute> runat   =  server  
   
           AutoGenerateColumns   = 错误  
   
           OnItemDataBound   =  DataGrid1_ItemDataBound >  
 <  列 >  
 <   asp：BoundColumn     DataField   =  au_fname    HeaderText   =  au_fname    /  >  
 <   asp：TemplateColumn  >  
 <   HeaderTemplate  >  
 <   asp：DropDownList   
   
                                           ID   = < span class =code-keyword> HeaderDropDown    Runat   =  server  
   
                                           AutoPostBack   =  True   
   
                                           OnSelectedIndexChanged   =  DropDown_SelectedIndexChanged   < span class =code-keyword> /  >  
 <   / HeaderTemplate  >  
 <   ItemTemplate  >  
 <   asp：DropDownList   
   
                                           ID   =  ItemDropDown    Runat   = 服务器  
   
                                           AutoPostBack   =  True  
   
                            < span class =code-attribute>               OnSelectedIndexChanged   =  DropDown_SelectedIndexChanged    /  >  
 <   / ItemTemplate  >  
 <   / asp：TemplateColumn  >  
 <   /列 >  
 <   / asp：DataGrid  >  

 protected void DataGrid1_ItemDataBound（object sender，DataGridItemEventArgs e）
 {
 if（e.Item.ItemType == ListItemType） .AlternatingItem || 
 e.Item.ItemType == ListItemType.Item）
 {
 string [] options = {Option1，Option2，Option3}; 
 
 DropDownList list =（DropDownList）e.Item.FindControl（ItemDropDown）; 
 list.DataSource = options; 
 list.DataBind（）; 
} 
 else if（e.Item.ItemType == ListItemType.Header）
 {
 string [] options = {OptionA，OptionB，OptionC} ; 
 
 DropDownList list =（DropDownList）e.Item.FindControl（HeaderDropDown）; 
 list.DataSource = options; 
 list.DataBind（）; 
} 
} 

请参阅以下链接



http://odetocode.com/articles/231.aspx [ ^ ]



问候，

Babu.K

在页面加载中使用

  if （！isPostBack）
 {
  //  编写代码或调用函数来绑定你的gridview  
} 

感谢

good morning

i have a dropdown in gridview.i am binding it to the database in which i am having some values.

when i run the program, it is showing the default value as --Select--

but i want to see the default item which is already selected.

please help me.

thank you.

解决方案

it''s my previous problem
try to look here

assign dropdownlist text value[^]

Hi,

Use the below code,

<asp:DataGrid

    id="DataGrid1" runat="server"

    AutoGenerateColumns="False"

    OnItemDataBound="DataGrid1_ItemDataBound">
    <Columns>
        <asp:BoundColumn DataField="au_fname" HeaderText="au_fname" />
        <asp:TemplateColumn>
            <HeaderTemplate>
                <asp:DropDownList

                    ID="HeaderDropDown" Runat="server"

                    AutoPostBack="True"

                    OnSelectedIndexChanged="DropDown_SelectedIndexChanged" />
            </HeaderTemplate>
            <ItemTemplate>
                <asp:DropDownList

                    ID="ItemDropDown" Runat="server"

                    AutoPostBack="True"

                    OnSelectedIndexChanged="DropDown_SelectedIndexChanged" />
            </ItemTemplate>
        </asp:TemplateColumn>
    </Columns>
</asp:DataGrid>

protected void DataGrid1_ItemDataBound(object sender, DataGridItemEventArgs e)
{
   if(e.Item.ItemType == ListItemType.AlternatingItem ||
      e.Item.ItemType == ListItemType.Item)
   {
      string[] options = { "Option1", "Option2", "Option3" };

      DropDownList list = (DropDownList)e.Item.FindControl("ItemDropDown");
      list.DataSource = options;
      list.DataBind();
   }
   else if(e.Item.ItemType == ListItemType.Header)
   {
      string[] options = { "OptionA", "OptionB", "OptionC" };

      DropDownList list = (DropDownList)e.Item.FindControl("HeaderDropDown");
      list.DataSource = options;
      list.DataBind();
   }
}

Refer the below link

http://odetocode.com/articles/231.aspx[^]

Regards,
Babu.K

in page load use

if(!isPostBack)
{
//write code or call function for bound your gridview here
}

Thanks

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