[英]Displaying Text in a Text Box From Listbox - ASP.net & VB.net
ASP.net code (ListBox) ASP.net代码(列表框)
<asp:ListBox class="mailList" ID="ListBox1" runat="server"
SelectionMode="Multiple" >
<asp:ListItem Value="0">Welcome to PVAL Portal</asp:ListItem>
<asp:ListItem Value="1">Reminder</asp:ListItem>
<asp:ListItem Value="2">User2</asp:ListItem>
</asp:ListBox>
ASP.net code (TextBox) ASP.net代码(文本框)
<asp:Label ID="Label3" runat="server" Text="Title:"></asp:Label>
<asp:TextBox ID="messageTitle" runat="server"></asp:TextBox>
<asp:TextBox ID="messageText" runat="server"TextMode="MultiLine" ></asp:TextBox>
VB.net code VB.net代码
Protected Sub ListBox1_SelectedIndexChanged(sender As Object, e As EventArgs) Handles ListBox1.SelectedIndexChanged
Dim curItem As String = ListBox1.SelectedIndex()
If curItem = 0 Then
messageTitle.Text = "Testing1"
messageText.Text = "Hello"
ElseIf curItem = 1 Then
messageTitle.Text = "Testing2"
messageText.Text = "Hello2"
ElseIf curItem = 2 Then
messageTitle.Text = "Testing3"
messageText.Text = "Hello3"
End If
End Sub
When I run the program and select any item from Listbox, but it didn't show the text in text box. 当我运行程序并从列表框中选择任何项目时,它没有在文本框中显示文本。 I figure out a way to fix this problem by adding a button for it. 我想出一种方法来解决此问题,方法是为其添加一个按钮。 But i do't really like it. 但是我真的不喜欢。 Just want to know is there any method to show the text in text box right after i select one of the item from ListBox without using button? 我只是想知道有什么方法可以在不使用按钮的情况下从ListBox中选择一项后立即在文本框中显示文本?
thank you in advance and appreciate it. 在此先感谢您,并感谢您。
Add Autopostback =true in your html of asp.net listbox. 在asp.net的HTML列表框中添加Autopostback = true。 Because right now your listbox does not postback when you change selection. 因为现在您的列表框在更改选择时不会回发。
<asp:ListBox class="mailList" ID="ListBox1" runat="server"
SelectionMode="Multiple" AutoPostBack="true">
<asp:ListItem Value="0">Welcome to PVAL Portal</asp:ListItem>
<asp:ListItem Value="1">Reminder</asp:ListItem>
<asp:ListItem Value="2">User2</asp:ListItem>
</asp:ListBox>
您应该在ListBox中将AutoPostBack属性设置为true
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