ASP.NET中ListBox实现Double Click事件

来源：互联网发布：播放视频软件编辑：程序博客网时间：2024/06/05 21:53

在网络上找了很多关于 ASP.NET中ListBox实现Double Click事件的信息,很多都是在用JS来实现双击事件的方法,看后感觉都比较麻烦,而且容易出错.通过一段时间的搜索,重要找到了一个自己觉得比较满意的方法来实现该功能.起具体实现方法如下:

(1)在WEB页面上加入JS脚本和存放ListBox事件的隐藏输入框,LISTBOX是用来保存时间的名称,在CS页面用到:其JS代码如下:

(2)将ASP.NET控件LISTBOX中加入双击事件声明如下:

<asp:ListBox id="ListBox1"
                     ondblclick="ListBox1_DoubleClick()" runat="server">
                 <asp:ListItem Value="1">One</asp:ListItem>
                 <asp:ListItem Value="2">Two</asp:ListItem>
                 <asp:ListItem Value="3">Three</asp:ListItem>
                 <asp:ListItem Value="4">Four</asp:ListItem>
             </asp:ListBox>
(3)在WEB窗体加载的时候执行如下代码(即双击LISTBOX中ITEM后执行的内容),

if(Request.Params["ListBox1Hidden"] != null
     && (string)Request.Params["ListBox1Hidden"] == "doubleclicked" )

{
    //the Listwas double click Event
    }
    }

例子如下:

<html>
<head>
     <script language="javascript">
     function ListBox1_DoubleClick() {
       /* we will change value of this hidden field so

    that in     page load event we can identify event.            */        document.forms[0].ListBox1Hidden.value = "doubleclicked";        document.forms[0].submit();     }</script></head><body>     <form runat="server">         <div>Double click on Listbox             <br />             <asp:ListBox id="ListBox1"                      ondblclick="ListBox1_DoubleClick()" runat="server">                 <asp:ListItem Value="1">One</asp:ListItem>                 <asp:ListItem Value="2">Two</asp:ListItem>                 <asp:ListItem Value="3">Three</asp:ListItem>                 <asp:ListItem Value="4">Four</asp:ListItem>             </asp:ListBox>             <input type="hidden" name="ListBox1Hidden" />         </div>         <div>click on button             <br />             <asp:Button id="Button1" onclick="Button1_Click"                  runat="server" Text="Button"/>         </div>     </form></body></html>

WEB窗体加载时候执行下列代码就能实现双击ListBox中Item执行一些操作

void Page_Load(Object sender, EventArgs e){   if(Request.Params["ListBox1Hidden"] != null     && (string)Request.Params["ListBox1Hidden"] == "doubleclicked") {    //This means It was double click     Response.Write("Double Click was fired selected item is "      + ListBox1.SelectedItem.Text);

}
}