Asp.net 2.0 自定义控件开发[创建自定义右键PopupMenu控件]

(一). 概述

        1. 当鼠标悬浮到控件对象上, 右击, 会弹出此自定义控件.

        2. 仅当控件支持oncontextmenu事件.

(二). 运行如图

  

(三). 用法

   1. 将PopupTraceMenur控件Dll添加引用到Web站点工程中

   2. 从工具箱拖动一个PopupTraceMenu控件和另一个支持oncontextmenu事件的控件到设计器中,

       比如: <GridView id="GridView1" runat="server" />

   3. 设置PopupTraceMenur的属性TargetControl=GridView1

   4. F5运行即可

(四). 完整代码

    1. 主控件PopupTraceMenu.cs代码

  1  /// <summary>
  2     /// Author: ChengKing(ZhengJian)
  3     /// </summary>
  4     [DefaultProperty("TargetControl")]
  5     [ToolboxData("<{0}:PopupTraceMenu runat=server></{0}:PopupTraceMenu>")]
  6     //[Designer(typeof(System.ComponentModel.Design.DesignerCollection))]
  7     public class PopupTraceMenu : Control, IComponent
  8     {
  9 
 10         [Bindable(true)]
 11         [Category("Appearance")]
 12         [DefaultValue("[PopupTraceMenu \"PopupTraceMenu11\"]")]
 13         [Localizable(true)]
 14         public string Text
 15         {
 16             get
 17             {
 18                 String s = (String)ViewState["Text"];
 19                 return ((s == null) ? String.Empty : s);
 20             }
 21 
 22             set
 23             {
 24                 ViewState["Text"] = value;
 25             }
 26         }
 27 
 28         [Bindable(true)]
 29         [Category("Appearance")]
 30         [DefaultValue("")]
 31         [Description("设置此控件的寄主控件")]
 32         [TypeConverter(typeof(ControlIDConverter))] 
 33         public string TargetControl
 34         {
 35             get
 36             {
 37                 String s = (String)ViewState["TargetControl"];
 38                 return ((s == null) ? String.Empty : s);                                                
 39             }
 40             set
 41             {
 42                 ViewState["TargetControl"] = value;
 43             }
 44         }
 45 
 46         protected override void Render(HtmlTextWriter writer)
 47         {
 48             if (DesignMode)
 49             {
 50                 this.Controls.Clear();                
 51                 LiteralControl lc = new LiteralControl();
 52                 lc.Text = this.Text;                
 53                 this.Controls.Add(lc);                
 54             }
 55             base.Render(writer);            
 56         }
 57 
 58         protected override void CreateChildControls()
 59         {            
 60             base.CreateChildControls();
 61         }
 62 
 63         protected override void OnPreRender(EventArgs e)
 64         {
 65 
 66             if (!Page.ClientScript.IsClientScriptBlockRegistered("BuildMenu"))
 67             {
 68                 Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "BuildMenu",
 69                     "<script type=‘text/javascript‘ src=‘JScript.js‘></script>");
 70             }
 71 
 72             Control targetControl = this.FindControl(TargetControl);
 73 
 74             StringBuilder strInitScript = new StringBuilder();
 75             if (targetControl != null)
 76             {                
 77                 strInitScript.Append("<script text/javascript> ");
 78                 strInitScript.Append("   writeStyle(); makeMenu(); ");
 79                 strInitScript.Append("   if( document.all&&window.print ) ");
 80                 strInitScript.Append("   { ");
 81                 strInitScript.Append("      var objClientId = ‘" + targetControl.ClientID + "‘;");
 82                 strInitScript.Append("      if(objClientId != null) ");
 83                 strInitScript.Append("      {");
 84                 strInitScript.Append("         var obj = document.getElementById(objClientId);");
 85                 strInitScript.Append("         document.onclick = hideMenu; ");
 86                 strInitScript.Append("         obj.oncontextmenu = showMenu;");
 87                 strInitScript.Append("      }");
 88                 strInitScript.Append("      else {alert(‘Please Set TargetControl Property!‘)}");
 89                 strInitScript.Append("   } ");
 90                 strInitScript.Append("</script>");
 91             }
 92             else
 93             {
 94                 strInitScript.Append("<script text/javascript> ");
 95                 strInitScript.Append("   alert(‘Please Set TargetControl Property!‘); ");
 96                 strInitScript.Append("</script>");
 97             }
 98             if (!Page.ClientScript.IsStartupScriptRegistered("InitScript"))
 99             {
100                 Page.ClientScript.RegisterStartupScript(this.GetType(), "InitScript",
101                     strInitScript.ToString());
102             }
103            
104             base.OnPreRender(e);
105         }        
106     }

    2. 测试页面文件default.aspx代码

1 <div>
2    <asp:GridView ID="GridView1" runat="server" </asp:GridView>  
3    <cc1:PopupTraceMenu ID="PopupTraceMenu1" runat="server" TargetControl= "GridView1">

 </cc1:PopupTraceMenu>                      
4 </div>

(五). 示例代码下载

       http://www.cnblogs.com/Files/MVP33650/自定义控件开发--[右键菜单].rar