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

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