asp.net列表框中的事件 [英] Event in asp.net list box
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问题描述
我如何在列表框事件处理程序中编写代码,我正在尝试valuechanged
和indexchanged
事件,但无法获取该事件.
请帮助我...
解决方案
很可能您没有设置AutoPostBack [ MSDN:ListControl.SelectedIndexChanged事件 [ ^ ]
样本:
< 表格 id =" runat =" < asp:ListBox id =" span> =" ListBox1_SelectedIndexChanged" =" true" =" 服务器" < asp:ListItem > Item 1 < /asp:ListItem > < asp:ListItem > Item 2 < /asp:ListItem > < asp:ListItem > Item 3 < /asp:ListItem > < asp:ListItem > Item 4 < /asp:ListItem > < asp:ListItem > Item 5 < /asp:ListItem > < asp:ListItem > Item 6 < /asp:ListItem > < /asp:ListBox > < asp:Label id =" runat 服务器" > < /form >
受保护的 无效 ListBox1_SelectedIndexChanged(对象发件人,EventArgs e) { Label1.Text = " + ListBox1.SelectedItem.Text + " + ListBox1.SelectedItem.价值+ " ; // 选择Item4会得出:您选择的Item 4的值为
>
How can i write the code in list box event handler, i am trying valuechanged
and indexchanged
event but i can not get the event.
please help me...
解决方案
Most likely you haven''t set the AutoPostBack[^] to true
Here, have a look at how it can be done:
MSDN: ListControl.SelectedIndexChanged Event[^]
Sample:
<form id="form1" runat="server"> <asp:ListBox id="ListBox1" OnSelectedIndexChanged="ListBox1_SelectedIndexChanged" AutoPostBack="true" runat="server"> <asp:ListItem>Item 1</asp:ListItem> <asp:ListItem>Item 2</asp:ListItem> <asp:ListItem>Item 3</asp:ListItem> <asp:ListItem>Item 4</asp:ListItem> <asp:ListItem>Item 5</asp:ListItem> <asp:ListItem>Item 6</asp:ListItem> </asp:ListBox> <asp:Label id="Label1" runat="server"/> </form>
protected void ListBox1_SelectedIndexChanged(object sender, EventArgs e) { Label1.Text = "You selected " + ListBox1.SelectedItem.Text + " with a value of
" + ListBox1.SelectedItem.Value + "."; // Selection of Item4 gives: "You selected Item 4 with a value of
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