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/**
* Namespace: System.Web.UI.WebControls
* Class: RadioButton
*
* Author: Gaurav Vaish
* Maintainer: gvaish@iitk.ac.in
* Contact: <my_scripts2001@yahoo.com>, <gvaish@iitk.ac.in>
* Implementation: yes
* Status: 100%
*
* (C) Gaurav Vaish (2001)
*/
using System;
using System.Collections;
using System.Collections.Specialized;
using System.Globalization;
using System.Web;
using System.Web.UI;
using System.ComponentModel;
namespace System.Web.UI.WebControls
{
//[Designer("??")]
public class RadioButton : CheckBox, IPostBackDataHandler
{
public RadioButton () : base ()
{
}
public virtual string GroupName
{
get {
object o = ViewState ["GroupName"];
return (o == null) ? String.Empty : (string) o;
}
set { ViewState ["GroupName"] = value; }
}
protected override void OnPreRender (EventArgs e)
{
base.OnPreRender (e);
if (Page != null && Enabled && !Checked)
Page.RegisterRequiresPostBack (this);
if(GroupName.Length == 0)
GroupName = UniqueID;
}
internal override void RenderInputTag (HtmlTextWriter writer, string id)
{
writer.AddAttribute (HtmlTextWriterAttribute.Id, id);
writer.AddAttribute (HtmlTextWriterAttribute.Type, "radio");
writer.AddAttribute (HtmlTextWriterAttribute.Name, UniqueGroupNamePrivate);
writer.AddAttribute (HtmlTextWriterAttribute.Value, ValueAttributePrivate);
if (Checked)
writer.AddAttribute (HtmlTextWriterAttribute.Checked, "checked");
if (AutoPostBack){
writer.AddAttribute (HtmlTextWriterAttribute.Onclick,
Page.GetPostBackClientEvent (this, ""));
writer.AddAttribute ("language", "javascript");
}
if (AccessKey.Length > 0)
writer.AddAttribute (HtmlTextWriterAttribute.Accesskey, AccessKey);
if (TabIndex > 0)
writer.AddAttribute (HtmlTextWriterAttribute.Tabindex,
TabIndex.ToString (NumberFormatInfo.InvariantInfo));
writer.RenderBeginTag (System.Web.UI.HtmlTextWriterTag.Input);
writer.RenderEndTag ();
}
private string UniqueGroupNamePrivate
{
get {
string retVal = GroupName;
int unique = UniqueID.LastIndexOf (':');
if (unique >= 0)
retVal += UniqueID.Substring (unique + 1);
return retVal;
}
}
private string ValueAttributePrivate
{
get {
string retVal = Attributes ["value"];
if (retVal != null)
return retVal;
if (ID != null)
return ID;
return UniqueID;
}
}
bool IPostBackDataHandler.LoadPostData (string postDataKey,
NameValueCollection postCollection)
{
bool _checked = Checked;
if (postCollection [UniqueGroupNamePrivate] == ValueAttributePrivate){
if (_checked)
return false;
Checked = true;
return true;
}
if (_checked)
Checked = false;
return true;
}
void IPostBackDataHandler.RaisePostDataChangedEvent ()
{
OnCheckedChanged (EventArgs.Empty);
}
}
}
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