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

   1 /*      System.Web.UI.HtmlControls\r
   2 *       Authors\r
   3 *               Leen Toelen (toelen@hotmail.com)\r
   4 */\r
   5 \r
   6 using System;\r
   7 using System.ComponentModel;\r
   8 using System.Globalization;\r
   9 using System.Web;\r
  10 using System.Web.UI;\r
  11 \r
  12 namespace System.Web.UI.HtmlControls{\r
  13         \r
  14         [DefaultEvent("ServerClick")]\r
  15         public class HtmlInputButton : HtmlInputControl, IPostBackEventHandler{\r
  16                 \r
  17                 private static readonly object EventServerClick = new object ();\r
  18                 \r
  19                 public HtmlInputButton(): base ("button")\r
  20                 {\r
  21                 }\r
  22                 \r
  23                 public HtmlInputButton(string type): base(type){}\r
  24                 \r
  25                 protected override void OnPreRender (EventArgs e)\r
  26                 {\r
  27                         base.OnPreRender(e);\r
  28                         if (Page != null && Events [EventServerClick] != null)\r
  29                                 Page.RequiresPostBackScript ();\r
  30                 }\r
  31 \r
  32                 protected override void RenderAttributes (HtmlTextWriter writer)\r
  33                 {\r
  34                         if (Page != null && CausesValidation) {\r
  35                                 string type = Type;\r
  36                                 if (String.Compare (type, "button", true) == 0 || String.Compare (type, "submit", true) == 0) {\r
  37                                         string script = Page.GetPostBackClientEvent (this, String.Empty);\r
  38                                         if (script != null && \r
  39                                                 ((String.Compare (type, "button", true) == 0  && Events[EventServerClick] != null )|| \r
  40                                                  (String.Compare (type, "submit", true) == 0 && Page.Validators.Count > 0))){\r
  41                                                 AttributeCollection coll = Attributes;\r
  42                                                 if (coll ["language"] != null)\r
  43                                                         coll.Remove ("language");\r
  44                                                 writer.WriteAttribute ("language", "javascript");\r
  45 \r
  46                                                 string onclick;\r
  47                                                 if ((onclick = coll ["onclick"]) != null) {\r
  48                                                         script = onclick + " " + script;\r
  49                                                         coll.Remove ("onclick");\r
  50                                                 }\r
  51                                                 \r
  52                                                 writer.WriteAttribute ("onclick", script);\r
  53                                         }\r
  54                                 }\r
  55                         }\r
  56                         \r
  57                         base.RenderAttributes (writer);\r
  58                 }\r
  59 \r
  60                 protected virtual void OnServerClick(EventArgs e){\r
  61                         EventHandler handler = (EventHandler) Events[EventServerClick];\r
  62                         if (handler != null){\r
  63                                 handler (this, e);\r
  64                         }\r
  65                 }\r
  66                 \r
  67                 void IPostBackEventHandler.RaisePostBackEvent (string eventArgument)\r
  68                 {\r
  69                         if(CausesValidation == true){\r
  70                                 Page.Validate();\r
  71                         }\r
  72                         OnServerClick(EventArgs.Empty);\r
  73                 }\r
  74                 \r
  75                 [WebCategory("Action")]\r
  76                 [WebSysDescription("Fires when the control is clicked.")]\r
  77                 public event EventHandler ServerClick{\r
  78                         add{\r
  79                                 Events.AddHandler(EventServerClick, value);\r
  80                         }\r
  81                         remove{\r
  82                                 Events.RemoveHandler(EventServerClick, value);\r
  83                         }\r
  84                 }\r
  85                 \r
  86                 [DefaultValue(true)]\r
  87                 [WebCategory("Behavior")]\r
  88                 public bool CausesValidation{\r
  89                         get{\r
  90                                 object causesVal = ViewState["CausesValidation"];\r
  91                                 if (causesVal != null){\r
  92                                         return (Boolean) causesVal;\r
  93                                 }\r
  94                                 return true;\r
  95                         }\r
  96                         set{\r
  97                                 ViewState["CausesValidation"] = (Boolean) value;\r
  98                         }\r
  99                 }\r
 100                 \r
 101         } // end of System.Web.UI.HtmlControls.HtmlInputButton\r
 102 } // namespace System.Web.UI.HtmlControls\r
 103 \r