前台有两个个listbox控件,通过listbox控件s1里选中多个选项后移到s2,在点击确定按钮后通过 label1显示s2中的内容,但label1显示为空,不知道问题出在哪里?
protected void Button1_Click(object sender, EventArgs e)
{
System.Text.StringBuilder str = new System.Text.StringBuilder();
foreach (ListItem i in s2.Items)
{
if (i.Selected == true)
str.Append(i.Value + ","); } if (str.Length > 2)
str.Remove(str.Length - 1, 1);
label1.Text = str.ToString();
}
protected void Button1_Click(object sender, EventArgs e)
{
System.Text.StringBuilder str = new System.Text.StringBuilder();
foreach (ListItem i in s2.Items)
{
if (i.Selected == true)
str.Append(i.Value + ","); } if (str.Length > 2)
str.Remove(str.Length - 1, 1);
label1.Text = str.ToString();
}
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using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{ }
protected void Button1_Click(object sender, EventArgs e)
{//两个按妞使用一个实践。COMMANNAME 一个为UP 一个为DOWN
//声明一个变量INDEX
//如果满足第一个条件那么INDEX为-1,因为你要实现的功能是像上移动,所以索引要减1
//如果不满足那就为+1像上移动,因为只有两个按妞来响应一个时间。
//
if (((Button)sender).CommandName == "up" && ListBox1.SelectedIndex > 0 || ((Button)sender).CommandName == "down" && ListBox1.SelectedIndex < ListBox1.Items.Count - 1)
{
int index;
if (((Button)sender).CommandName == "up")
{
index = -1;
}
else
{
index = 1;
}
//声明一个LISTITEM对象把选定的值和文本传进去
ListItem lt = new ListItem(ListBox1.SelectedItem.Text, ListBox1.SelectedValue);
//[ListBox1.SelectedIndex]为索引值然后讲ListBox1.Items[ListBox1.SelectedIndex].Text的值
//传给ListBox1.Items[ListBox1.SelectedIndex + index].Text
//ListBox1.SelectedIndex + index是经过转换后的索引
ListBox1.Items[ListBox1.SelectedIndex].Text = ListBox1.Items[ListBox1.SelectedIndex + index].Text;
ListBox1.Items[ListBox1.SelectedIndex].Value = ListBox1.Items[ListBox1.SelectedIndex + index].Text;
ListBox1.Items[ListBox1.SelectedIndex + index].Text = lt.Text;
ListBox1.Items[ListBox1.SelectedIndex + index].Value = lt.Value;
ListBox1.SelectedIndex = ListBox1.SelectedIndex + index; }
}
protected void Button2_Click(object sender, EventArgs e)
{ }
protected void Button3_Click(object sender, EventArgs e)
{//光标的索引移动到0 也就是第一个位置
ListBox1.SelectedIndex = 0;
}
protected void Button4_Click(object sender, EventArgs e)
{
ListBox1.SelectedIndex = ListBox1.SelectedIndex - 1; }
protected void Button5_Click(object sender, EventArgs e)
{
ListBox1.SelectedIndex = ListBox1.SelectedIndex + 1;
}
protected void Button6_Click(object sender, EventArgs e)
{
ListBox1.SelectedIndex = ListBox1.Items.Count - 1;
}
}
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title></title>
<script type="text/javascript">
var bak = null;
function setData() {
ss1 = document.getElementById("<%=s1.ClientID %>");
ss2 = document.getElementById("<%=s2.ClientID %>");
if (bak == null) {
bak = [];
for (i = 0; i < ss1.length; i++) bak.push(ss1[i].value);
} for (i = ss1.length - 1; i > -1; i--) {
if (ss1[i].selected) {
ss2.options[ss2.options.length] = new Option(ss1[i].value, ss1[i].value);
ss1[i].parentNode.removeChild(ss1[i]);
}
}
SortSelect(ss1);
SortSelect(ss2);
} function removeData() {
ss1 = document.getElementById("<%=s1.ClientID %>");
ss2 = document.getElementById("<%=s2.ClientID %>");
for (i = ss2.length - 1; i > -1; i--) {
if (ss2[i].selected) {
ss1.options[ss1.options.length] = new Option(ss2[i].value, ss2[i].value);
ss2[i].parentNode.removeChild(ss2[i]);
}
}
SortSelect(ss1);
SortSelect(ss2);
} function SortSelect(ss) {
var tt = [];
for (i = 0; i < bak.length; i++) {
for (j = 0; j < ss.length; j++) {
if (ss[j].value == bak[i]) tt.push(bak[i]);
}
}
ss.length = 0;
for (i = 0; i < tt.length; i++) {
ss.options[ss.options.length] = new Option(tt[i], tt[i]);
}
}
</script>
</head>
<body>
<form runat="server" id="form1">
<table>
<tr>
<td>
<asp:ListBox ID="s1" runat="server" SelectionMode="Multiple" Rows="6"
Width="107px">
<asp:ListItem>A</asp:ListItem>
<asp:ListItem>B</asp:ListItem>
<asp:ListItem>C</asp:ListItem>
<asp:ListItem>D</asp:ListItem>
</asp:ListBox>
</td>
<td>
<input onclick="setData()" type="button" value="->"/>
<br />
<input onclick="removeData()" type="button" value="<-" />
</td>
<td>
<asp:ListBox ID="s2" runat="server" SelectionMode="Multiple" Rows="6"
Width="109px"></asp:ListBox>
</td>
</tr>
</table>
<asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="gread" />
</form>
<asp:Label ID="label1" runat="server" ForeColor="Red" Text="123"
Visible="True" style="text-align: right"></asp:Label>
</body>
</html>
后台测试:
protected void Button1_Click(object sender, EventArgs e)
{
int t = s1.Items.Count;
for (int i = 0; i < t; i++)
{
Response.Write(s1.Items[i].Text);
Response.Write("<br/>");
}
}