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

   1 //
   2 // Permission is hereby granted, free of charge, to any person obtaining
   3 // a copy of this software and associated documentation files (the
   4 // "Software"), to deal in the Software without restriction, including
   5 // without limitation the rights to use, copy, modify, merge, publish,
   6 // distribute, sublicense, and/or sell copies of the Software, and to
   7 // permit persons to whom the Software is furnished to do so, subject to
   8 // the following conditions:
   9 //
  10 // The above copyright notice and this permission notice shall be
  11 // included in all copies or substantial portions of the Software.
  12 //
  13 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  14 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  15 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  16 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  17 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  18 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  19 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  20 //
  21 //
  22 // System.Web.UI.HtmlControls.HtmlButton
  23 //
  24 // Authors:
  25 //      Jackson Harper (jackson@ximian.com)
  26 //
  27 // (C) 2005-2010 Novell, Inc.
  28
  29
  30 using System.ComponentModel;
  31 using System.Security.Permissions;
  32
  33 namespace System.Web.UI.HtmlControls {
  34
  35         // CAS
  36         [AspNetHostingPermission (SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
  37         [AspNetHostingPermission (SecurityAction.InheritanceDemand, Level = AspNetHostingPermissionLevel.Minimal)]
  38         // attributes
  39         [DefaultEvent("ServerClick")]
  40         [SupportsEventValidation]
  41         public class HtmlButton : HtmlContainerControl, IPostBackEventHandler {
  42
  43                 static readonly object ServerClickEvent = new object();
  44
  45                 public HtmlButton () : base ("button")
  46                 {
  47                 }
  48
  49                 [DefaultValue(true)]
  50                 [WebSysDescription("")]
  51                 [WebCategory("Behavior")]
  52                 public virtual bool CausesValidation {
  53                         get {
  54                                 return ViewState.GetBool ("CausesValidation", true);
  55                         }
  56                         set {
  57                                 ViewState ["CausesValidation"] = value;
  58                         }
  59                 }
  60
  61                 [DefaultValue ("")]
  62                 public virtual string ValidationGroup
  63                 {
  64                         get {
  65                                 return ViewState.GetString ("ValidationGroup", "");
  66                         }
  67                         set {
  68                                 ViewState ["ValidationGroup"] = value;
  69                         }
  70                 }
  71                 void IPostBackEventHandler.RaisePostBackEvent (string eventArgument)
  72                 {
  73                         RaisePostBackEvent (eventArgument);
  74                 }
  75
  76                 protected virtual void RaisePostBackEvent (string eventArgument)
  77                 {
  78                         ValidateEvent (UniqueID, eventArgument);
  79                         if (CausesValidation)
  80                                 Page.Validate (ValidationGroup);
  81                         OnServerClick (EventArgs.Empty);
  82                 }
  83
  84                 protected internal override void OnPreRender (EventArgs e)
  85                 {
  86                         base.OnPreRender (e);
  87                 }
  88
  89                 protected virtual void OnServerClick (EventArgs e)
  90                 {
  91                         EventHandler server_click = (EventHandler) Events [ServerClickEvent];
  92                         if (server_click != null)
  93                                 server_click (this, e);
  94                 }
  95
  96                 protected override void RenderAttributes (HtmlTextWriter writer)
  97                 {
  98                         Page page = Page;
  99                         if (page != null && Events [ServerClickEvent] != null) {
 100                                 PostBackOptions options = GetPostBackOptions ();
 101                                 Attributes ["onclick"] += page.ClientScript.GetPostBackEventReference (options, true);
 102                                 writer.WriteAttribute ("language", "javascript");
 103                         }
 104
 105                         base.RenderAttributes (writer);
 106                 }
 107
 108                 PostBackOptions GetPostBackOptions ()
 109                 {
 110                         Page page = Page;
 111                         PostBackOptions options = new PostBackOptions (this);
 112                         options.ValidationGroup = null;
 113                         options.ActionUrl = null;
 114                         options.Argument = String.Empty;
 115                         options.RequiresJavaScriptProtocol = false;
 116                         options.ClientSubmit = true;
 117                         options.PerformValidation = CausesValidation && page != null && page.AreValidatorsUplevel (ValidationGroup);
 118                         if (options.PerformValidation)
 119                                 options.ValidationGroup = ValidationGroup;
 120
 121                         return options;
 122                 }
 123
 124                 [WebSysDescription("")]
 125                 [WebCategory("Action")]
 126                 public event EventHandler ServerClick {
 127                         add { Events.AddHandler (ServerClickEvent, value); }
 128                         remove { Events.RemoveHandler (ServerClickEvent, value); }
 129                 }
 130         }
 131 }
 132