在组合框中选择文本时更改标签VB.Net

Question

我有一个包含两个选项的组合框。从下拉列表中选择一个选项时，我希望标签的文字在其上方进行相应更改。有没有一种简单的方法可以做到这一点事件呢？

我很感激任何答复。

Answer 1

试试这个

你需要写在组合框中的selectedIndex更改事件的代码

如：

Protected Sub DropDownList1_SelectedIndexChanged(sender As Object, e As EventArgs) Handles DropDownList1.SelectedIndexChanged 
     Label1.Text= DropDownList1.SelectedItem.Text.ToString() 
End Sub 

和你需要在PageLoad中设置DropDownList.AutoPostBack=true事件

Answer 2

变化取决于您的控件..

Private Sub YourComboBox_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles YourComboBox.Click 

    UrLabel.Text = YourComboBox.SelectedValue 

End Sub 

Answer 3

Asp.net

组合框

您需要设置的AutoPostBack = “真”

<table> 
      <tr> 
       <td><asp:ComboBox ID="cmb" runat="server" AutoPostBack="True"> 
      <asp:ListItem>1</asp:ListItem> 
      <asp:ListItem>2</asp:ListItem> 
      </asp:ComboBox></td> 

     <td> 
      <asp:Label ID="lbl" runat="server"></asp:Label> 
     </td> 
      </tr> 
     </table> 

.aspx文件（代码后面）

Protected Sub cmb_SelectedIndexChanged(sender As Object, e As EventArgs) Handles cmb.SelectedIndexChanged 
     lbl.Text = cmb.SelectedValue 
    End Sub 

Asp.net

的DropDownList

您需要设置的AutoPostBack = “真”

<table> 
      <tr> 
       <td><asp:DropDownList ID="ddl" runat="server" AutoPostBack="True"> 
      <asp:ListItem>1</asp:ListItem> 
      <asp:ListItem>2</asp:ListItem> 
      </asp:DropDownList></td> 

     <td> 
      <asp:Label ID="lbl" runat="server"></asp:Label> 
     </td> 
      </tr> 
     </table> 

.aspx文件（代码后面）

Protected Sub ddl_SelectedIndexChanged(sender As Object, e As EventArgs) Handles ddl.SelectedIndexChanged 
     lbl.Text = ddl.SelectedValue 
    End Sub