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 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         public class HtmlButton : HtmlContainerControl, IPostBackEventHandler {
  41
  42                 private static readonly object ServerClickEvent = new object();
  43
  44                 public HtmlButton () : base ("button")
  45                 {
  46                 }
  47
  48                 [DefaultValue(true)]
  49                 [WebSysDescription("")]
  50                 [WebCategory("Behavior")]
  51 #if NET_2_0
  52                 public virtual
  53 #else
  54                 public
  55 #endif
  56                 bool CausesValidation {
  57                         get {
  58                                 return ViewState.GetBool ("CausesValidation", true);
  59                         }
  60                         set {
  61                                 ViewState ["CausesValidation"] = value;
  62                         }
  63                 }
  64
  65 #if NET_2_0
  66                 [DefaultValue ("")]
  67                 public string ValidationGroup
  68                 {
  69                         get {
  70                                 return ViewState.GetString ("ValidationGroup", "");
  71                         }
  72                         set {
  73                                 ViewState ["ValidationGroup"] = value;
  74                         }
  75                 }
  76 #endif
  77
  78 #if NET_2_0
  79                 void IPostBackEventHandler.RaisePostBackEvent (string eventArgument)
  80                 {
  81                         RaisePostBackEvent (eventArgument);
  82                 }
  83
  84                 protected virtual void RaisePostBackEvent (string eventArgument)
  85 #else
  86                 void IPostBackEventHandler.RaisePostBackEvent (string eventArgument)
  87 #endif
  88                 {
  89                         if (CausesValidation)
  90 #if NET_2_0
  91                                 Page.Validate (ValidationGroup);
  92 #else
  93                                 Page.Validate ();
  94 #endif
  95                         OnServerClick (EventArgs.Empty);
  96                 }
  97
  98 #if NET_2_0
  99                 protected internal
 100 #else
 101                 protected
 102 #endif
 103                 override void OnPreRender (EventArgs e)
 104                 {
 105                         base.OnPreRender (e);
 106                 }
 107
 108                 protected virtual void OnServerClick (EventArgs e)
 109                 {
 110                         EventHandler server_click = (EventHandler) Events [ServerClickEvent];
 111                         if (server_click != null)
 112                                 server_click (this, e);
 113                 }
 114
 115                 protected override void RenderAttributes (HtmlTextWriter writer)
 116                 {
 117                         ClientScriptManager csm = new ClientScriptManager (Page);
 118                         bool postback = false;
 119
 120                         if (Page != null && Events [ServerClickEvent] != null)
 121                                 postback = true;
 122
 123                         if (CausesValidation && Page != null && Page.AreValidatorsUplevel ()) {
 124                                 if (postback)
 125                                         writer.WriteAttribute ("onclick",
 126                                                                String.Format ("javascript:{{if (typeof(Page_ClientValidate) != 'function' ||  Page_ClientValidate()) {0}}}",
 127                                                                               csm.GetPostBackEventReference (this, String.Empty)));
 128                                 else
 129                                         writer.WriteAttribute ("onclick",
 130                                                                "if (typeof(Page_ClientValidate) == 'function') Page_ClientValidate();");
 131
 132                                 writer.WriteAttribute ("language", "javascript");
 133                         }
 134                         else if (postback) {
 135                                 writer.AddAttribute ("onclick",
 136                                                      Page.ClientScript.GetPostBackClientHyperlink (this, ""));
 137
 138                                 writer.WriteAttribute ("language", "javascript");
 139                         }
 140
 141                         base.RenderAttributes (writer);
 142                 }
 143
 144                 [WebSysDescription("")]
 145                 [WebCategory("Action")]
 146                 public event EventHandler ServerClick {
 147                         add { Events.AddHandler (ServerClickEvent, value); }
 148                         remove { Events.RemoveHandler (ServerClickEvent, value); }
 149                 }
 150         }
 151
 152 }
 153