System Information

Impossible Is Nothing...

导航

为.net中的ListBox控件添加双击事件

        我在用dotnet做一个项目的过程中,遇到了一个ListBox的问题:通过在一个ListBox中双击,把选中的项添加到另一个ListBox中,但ListBox控件本身并没有该事件,那么如何实现呢?我就想到了客户端脚本javascrit,通过查阅相关资料,终于把这个问题解决了,现在写出来与大家分享,希望能对大家有所帮助。
        这里有三个问题:
        第一:双击所要执行的javascript代码是什么?
 1                     function change()
 2                         {
 3                              var addOption=document.createElement("option");
 4                              var index1;
 5                              if(document.Form1.ListBox1.length==0)return(false);
 6                               index1=document.Form1.ListBox1.selectedIndex; 
 7                              if(index1<0)return(false);
 8                               addOption.text=document.Form1.ListBox1.options(index1).text;
 9                               addOption.value=document.Form1.ListBox1.value;
10                              document.Form1.ListBox2.add(addOption);
11                              document.Form1.ListBox1.remove (index1);
12                          }
13 

        第二:如何将 javas cript 代码转换为C#代码?
  
 1 public static void ListBox_DblClick(Page page,System.Web.UI.WebControls.WebControl webcontrol,string                                 SourceControlName,string TargetControlName)
 2                      {
 3                            SourceControlName = "document.Form1." +  SourceControlName;
 4                            TargetControlName = "document.Form1." +  TargetControlName;
 5                            string js = "<s cript language=javas cript> function change(SourceControlName,TargetControlName)";
 6                            js += "{";
 7                            js +=     "var addOption=document.createElement('option'); \n";
 8                            js += "  var index1; \n";
 9                            js += "if(SourceControlName.length==0)return(false);\n";
10                            js += "  index1=SourceControlName.selectedIndex; \n ";
11                            js += "  if(index1<0)return(false);\n";
12                            js += " addOption.text=SourceControlName.options(index1).text; \n";
13                            js += "addOption.value=SourceControlName.value; \n";
14                            js += "TargetControlName.add(addOption); \n";
15                            js += "SourceControlName.remove (index1) \n";
16                            js +="}";
17                            js += "</s cript>";
18                             //注册该 javas cript ;
19                            page.RegisterStartups cript("",js);
20                             //为控件添加双击事件;
21                            webcontrol.Attributes.Add("onDblClick","change(" + SourceControlName + "," + TargetControlName +                                 ");");
22                       }
23 
24 
            在该方法中,SourceControlName是要绑定双击事件的控件,TargetControlName是接收双击事件选定项的控件。    
            这里有一个问题,如何让对象作为参数传给javas cript的change函数,我这里采用的是用 SourceControlName  ,TargetControlName 来传递两个ListBox的Name, 然后与“document.Form1.“组合成一个串来传递给javas cript的change函数,即
                            SourceControlName = "document.Form1." +  SourceControlName;
                           TargetControlName = "document.Form1." +  TargetControlName;
        第三:如何为控件添加双击事件?
        用ControlName.Attributes.Add(“属性名称”,“函数名称或代码”);

posted on 2005-11-17 21:47  SysInfo  阅读(1058)  评论(1编辑  收藏  举报