1  [ToolboxData("<{0}:GroupRadioButton runat=server></{0}:GroupRadioButton>")]
2    public class GroupRadioButton : RadioButton, IPostBackDataHandler
3    {
4        public GroupRadioButton()
5            : base()
6        {
7        }
8
9        Properties#region Properties
10
11        private string Value
12        {
13            get
14            {
15                string val = Attributes["value"];
16                if (val == null)
17                    val = UniqueID;
18                else
19                    val = UniqueID + "_" + val;
20                return val;
21            }
22        }
23
24        #endregion
25
26        Rendering#region Rendering
27
28        protected override void Render(HtmlTextWriter output)
29        {
30            RenderInputTag(output);
31        }
32
33        private void RenderInputTag(HtmlTextWriter htw)
34        {
35            htw.AddAttribute(HtmlTextWriterAttribute.Id, ClientID);
36            htw.AddAttribute(HtmlTextWriterAttribute.Type, "radio");
37            htw.AddAttribute(HtmlTextWriterAttribute.Name, GroupName);
38            htw.AddAttribute(HtmlTextWriterAttribute.Value, Value);
39            if (Checked)
40                htw.AddAttribute(HtmlTextWriterAttribute.Checked, "checked");
41            if (!Enabled)
42                htw.AddAttribute(HtmlTextWriterAttribute.Disabled, "disabled");
43
44            string onClick = Attributes["onclick"];
45            if (AutoPostBack)
46            {
47                if (onClick != null)
48                    onClick = String.Empty;
49                onClick += Page.GetPostBackClientEvent(this, String.Empty);
50                htw.AddAttribute(HtmlTextWriterAttribute.Onclick, onClick);
51                htw.AddAttribute("language", "javascript");
52            }
53            else
54            {
55                if (onClick != null)
56                    htw.AddAttribute(HtmlTextWriterAttribute.Onclick, onClick);
57            }
58
59            if (AccessKey.Length > 0)
60                htw.AddAttribute(HtmlTextWriterAttribute.Accesskey, AccessKey);
61            if (TabIndex != 0)
62                htw.AddAttribute(HtmlTextWriterAttribute.Tabindex,
63                    TabIndex.ToString(NumberFormatInfo.InvariantInfo));
64            htw.RenderBeginTag(HtmlTextWriterTag.Input);
65            htw.RenderEndTag();
66        }
67
68        #endregion
69
70        IPostBackDataHandler Members#region IPostBackDataHandler Members
71
72        void IPostBackDataHandler.RaisePostDataChangedEvent()
73        {
74            OnCheckedChanged(EventArgs.Empty);
75        }
76
77        bool IPostBackDataHandler.LoadPostData(string postDataKey,
78            System.Collections.Specialized.NameValueCollection postCollection)
79        {
80            bool result = false;
81            string value = postCollection[GroupName];
82            if ((value != null) && (value == Value))
83            {
84                if (!Checked)
85                {
86                    Checked = true;
87                    result = true;
88                }
89            }
90            else
91            {
92                if (Checked)
93                    Checked = false;
94            }
95            return result;
96        }
97
98        #endregion
99    }