我如何...下拉列表中的多个选择 [英] How do I... Multiple selection in dropdown

问题描述

如何在下拉列表中进行多项选择并在文本框中显示。



我尝试过：



< asp：ListBox ID =lstSelectrunat =serverSelectionMode =Multiple>

< asp：ListItem Text =Mango值=1/>

< asp：ListItem Text =Apple值=2/>

< asp：ListItem Text = BananaValue =3/>

How to do multiple selection in dropdownlist and display it in textbox.

What I have tried:

<asp:ListBox ID="lstSelect" runat="server" SelectionMode="Multiple">
<asp:ListItem Text="Mango" Value="1" />
<asp:ListItem Text="Apple" Value="2" />
<asp:ListItem Text="Banana" Value="3" />

推荐答案

试试这个

try this

<asp:ListBox ID="lstSelect" runat="server" SelectionMode="Multiple" AutoPostBack="true" OnSelectedIndexChanged="lstSelect_SelectedIndexChanged">
            <asp:ListItem Text="Mango" Value="1" />
            <asp:ListItem Text="Apple" Value="2" />
            <asp:ListItem Text="Banana" Value="3" />
        </asp:ListBox>
        <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>

protected void lstSelect_SelectedIndexChanged(object sender, EventArgs e)
      {
          string items = "";
          foreach (ListItem item in lstSelect.Items)
              if (item.Selected)
                  items += item.Text + ",";
          TextBox1.Text = items.Trim().TrimEnd(','); ;
      }

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