mcs/class/System.Web/System.Web.UI.HtmlControls/HtmlInputHidden.cs

   1 /*      System.Web.UI.HtmlControls
   2 *       Authors
   3 *               Leen Toelen (toelen@hotmail.com)
   4 */
   5
   6 using System;
   7 using System.Collections.Specialized;
   8 using System.ComponentModel;
   9 using System.Globalization;
  10 using System.Web;
  11 using System.Web.UI;
  12
  13 namespace System.Web.UI.HtmlControls{
  14
  15         [DefaultEvent("ServerChange")]
  16         public class HtmlInputHidden : HtmlInputControl, IPostBackDataHandler{
  17
  18                 private static readonly object EventServerChange = new object ();
  19
  20                 public HtmlInputHidden () : base ("hidden")
  21                 {
  22                 }
  23
  24                 bool IPostBackDataHandler.LoadPostData (string postDataKey,
  25                                                        NameValueCollection postCollection)
  26                 {
  27                         string postValue = postCollection [postDataKey];
  28                         if (postValue != null)
  29                                 Value = postValue;
  30                         return false;
  31                 }
  32
  33                 void IPostBackDataHandler.RaisePostDataChangedEvent ()
  34                 {
  35                         // don't need anything. LoadPostData always returns false.
  36                 }
  37
  38                 protected virtual void OnServerChange (EventArgs e)
  39                 {
  40                         EventHandler handler = (EventHandler) Events [EventServerChange];
  41                         if (handler != null)
  42                                 handler (this, e);
  43                 }
  44
  45                 protected override void OnPreRender(EventArgs e){
  46                         if (Events[EventServerChange] != null && !Disabled)
  47                                 ViewState.SetItemDirty("value",false);
  48                 }
  49
  50                 [WebCategory("Action")]
  51                 [WebSysDescription("Fires when the value of the control changes.")]
  52                 public event EventHandler ServerChange{
  53                         add{
  54                                 Events.AddHandler(EventServerChange, value);
  55                         }
  56                         remove{
  57                                 Events.RemoveHandler(EventServerChange, value);
  58                         }
  59                 }
  60
  61         } // class HtmlInputFile
  62 } // namespace System.Web.UI.HtmlControls
  63