Asp.net 2.0 自定義控件開發(fā)[創(chuàng)建自定義右鍵PopupMenu控件]

學無止境 2007-04-02

展開全文

(一). 概述

1. 當鼠標懸浮到控件對象上, 右擊, 會彈出此自定義控件.

2. 僅當控件支持oncontextmenu事件.

(二). 運行如圖

(三). 用法

1. 將PopupTraceMenur控件Dll添加引用到Web站點工程中

2. 從工具箱拖動一個PopupTraceMenu控件和另一個支持oncontextmenu事件的控件到設(shè)計器中,

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

3. 設(shè)置PopupTraceMenur的屬性TargetControl=GridView1

4. F5運行即可

(四). 完整代碼

1. 主控件PopupTraceMenu.cs代碼

  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("設(shè)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. 測試頁面文件default.aspx代碼

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