用C＃編寫一個雙擊事件
[英]Coding a double click event in C#
問題描述
如果我想創建雙擊甚至從列表框和消息框中選擇一個項目，並帶有刪除所選項目的選項，我將如何編碼？
2 個解決方案
解決方案1
0 2012-05-24 22:58:06
只需將這段代碼放在ListBox DoubleClick事件處理程序中即可。 （讓您的列表框ID為“ ListBox1” ）
MessageBox.Show(ListBox1.SelectedItem.ToString());
解決方案2
0 2012-05-24 23:06:44
我做了這樣的事情。 幾乎雙擊可以從一個文本框添加到另一個文本框，然后雙擊另一個將其刪除。 其實在這里！ 獲取整個源代碼。 進行一個新項目，將其粘貼在那里並運行它。 它應該正是您想要的。 請記住，您不能只更改正面的值，因為背面永遠不會看到它，因此我們將這些值存儲在一個隱藏變量中，然后在背面填充它。
ListBoxEvents.aspx（注意：省略標題）
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<script src="http://code.jquery.com/jquery-latest.js"></script>
<script type="text/javascript">
$(document).ready(function () {
//Listbox: ORIGINAL - Controls
var removeOriginal = false;
var lbOriginal = 'ListBox1';
var lbDestination = 'ListBox2'
var lineHeight = 12;
var lbElementsHeight = (($('[id*=' + lbOriginal + ']').find("option").length) * lineHeight) + 'px';
//var lh = $('[id*=' + lbOriginal + ']').css('line-height');
//Normalize Width
$('[id*=' + lbDestination + ']').width($('[id*=' + lbOriginal + ']').width());
$('[id*=' + lbOriginal + ']').dblclick(function () {
//Get name and value of a selected listbox item
var itemName = "";
var itemValue = "";
$('[id*=' + lbOriginal + '] option:selected').each(function () {
itemName += $(this).text();
itemValue += $(this).val();
});
//If user doubleclicked on empty spot, return
if (itemName == "" && itemValue == "")
return;
//Prevent duplicate appends
var itemAlreadyExists = false
$('[id*=' + lbDestination + '] option').each(function () {
if ($(this).text() == itemName && $(this).val() == itemValue)
itemAlreadyExists = true;
});
if (!itemAlreadyExists) {
$('[id*=' + lbDestination + ']').append('<option value="' + itemValue + '">' + itemName + '</option>');
//Select the last element in the destination listbox
$('[id*=' + lbDestination + '] option[selected]').removeAttr("selected");
$('[id*=' + lbDestination + "] option[value='" + itemValue + "']").attr("selected", "selected");
$('[id*=' + lbDestination + ']').animate({ scrollTop: lbElementsHeight }, 800);
AddItem(itemName, itemValue);
}
if (removeOriginal)
$('[id*=' + lbOriginal + "] option[value='" + itemValue + "']").remove();
}).trigger('change');
//Listbox: DESTINATION - Controls
$('[id*=' + lbDestination + ']').dblclick(function () {
//Get name and value of a selected listbox item
var itemName = "";
var itemValue = "";
$('[id*=' + lbDestination + '] option:selected').each(function () {
itemName += $(this).text();
itemValue += $(this).val();
});
//If user doubleclicked on empty spot, return
if (itemName == "" && itemValue == "")
return;
//If we have removed the value from the original listbox, return it
if (removeOriginal)
$('[id*=' + lbOriginal + ']').append('<option value="' + itemValue + '">' + itemName + '</option>');
//Remove the value from this listbox
$('[id*=' + lbDestination + "] option[value='" + itemValue + "']").remove();
RemoveItem(itemName, itemValue);
}).trigger('change');
function AddItem(itemName, itemValue) {
var hfLB2Items = $('[id*=hfLB2Items]');
var item = itemName + '~' + itemValue;
if (hfLB2Items.val() != "")
item = '|' + item;
hfLB2Items.val(hfLB2Items.val() + item);
}
function RemoveItem(itemName, itemValue) {
var hfLB2Items = $('[id*=hfLB2Items]');
var item = itemName + '~' + itemValue;
if (hfLB2Items.val().indexOf('|' + item) != -1)
hfLB2Items.val(hfLB2Items.val().replace('|' + item, ''));
else if (hfLB2Items.val().indexOf(item + '|') != -1)
hfLB2Items.val(hfLB2Items.val().replace(item + '|', ''));
else
hfLB2Items.val(hfLB2Items.val().replace(item, ''));
}
});
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:ListBox ID="ListBox1" runat="server" Width="80" Height="150" style="float:left">
<asp:ListItem Value="one">1</asp:ListItem>
<asp:ListItem Value="two">2</asp:ListItem>
<asp:ListItem Value="three">3</asp:ListItem>
<asp:ListItem Value="four">4</asp:ListItem>
<asp:ListItem Value="five">5</asp:ListItem>
<asp:ListItem Value="six">6</asp:ListItem>
<asp:ListItem Value="seven">7</asp:ListItem>
<asp:ListItem Value="eight">8</asp:ListItem>
<asp:ListItem Value="nine">9</asp:ListItem>
<asp:ListItem Value="ten">10</asp:ListItem>
<asp:ListItem Value="eleven">11</asp:ListItem>
<asp:ListItem Value="twelve">12</asp:ListItem>
<asp:ListItem Value="thirteen">13</asp:ListItem>
<asp:ListItem Value="fourteen">14</asp:ListItem>
<asp:ListItem Value="fifteen">15</asp:ListItem>
<asp:ListItem Value="sixteen">16</asp:ListItem>
<asp:ListItem Value="seventeen">17</asp:ListItem>
<asp:ListItem Value="eighteen">18</asp:ListItem>
</asp:ListBox>
<asp:ListBox ID="ListBox2" runat="server" Width="80" Height="150" style="float:left"></asp:ListBox>
</div>
<div style="clear:both"></div>
<asp:TextBox ID="tbCount" runat="server" Enabled="False"></asp:TextBox><br />
<asp:Button ID="btnCount" runat="server" onclick="btnCount_Click" Text="ListBox 2 Item Count" />
<asp:HiddenField ID="hfLB2Items" runat="server" />
<div>
<h2>Double Click Event</h2><hr />
<p id="MyPara" style="background-color:Yellow;color:Red;font-size:2.2em;">
Double Click here to display alert
</p>
<br />
<br />
<script language="javascript" type="text/javascript">
$(document).ready(function () {
$("#MyPara").dblclick(
function () {
ShowAlert();
}
);
});
function ShowAlert() {
alert("Alert message on double click");
}
</script>
</div>
</form>
</body>
</html>
ListBoxEvents.aspx.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class ListBoxEvents : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void btnCount_Click(object sender, EventArgs e)
{
PopulateDestinationListBox();
int itemCount = ListBox2.Items.Count;
tbCount.Text = itemCount.ToString();
}
protected void lbCount_Click(object sender, EventArgs e)
{
int itemCount = ListBox2.Items.Count;
tbCount.Text = itemCount.ToString();
}
private void PopulateDestinationListBox()
{
ListBox2.Items.Clear();
string[] pairs = hfLB2Items.Value.Split('|');
if (pairs.Length == 0 && string.IsNullOrEmpty(pairs[0]))
return;
foreach (string pair in pairs)
{
string[] values = pair.Split('~');
ListBox2.Items.Add(new ListItem(values[0], values[1]));
}
}
}
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