mcs/class/System.Web/System.Web.UI.WebControls/RequiredFieldValidator.cs

   1 //
   2 // System.Web.UI.WebControls.RequiredFieldValidator
   3 //
   4 // Authors:
   5 //      Ben Maurer (bmaurer@novell.com)
   6 //
   7 // (C) 2005 Novell, Inc (http://www.novell.com)
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining
  10 // a copy of this software and associated documentation files (the
  11 // "Software"), to deal in the Software without restriction, including
  12 // without limitation the rights to use, copy, modify, merge, publish,
  13 // distribute, sublicense, and/or sell copies of the Software, and to
  14 // permit persons to whom the Software is furnished to do so, subject to
  15 // the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be
  18 // included in all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27 //
  28
  29 using System.ComponentModel;
  30 using System.Security.Permissions;
  31
  32 namespace System.Web.UI.WebControls {
  33         // CAS
  34         [AspNetHostingPermission (SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
  35         [AspNetHostingPermission (SecurityAction.InheritanceDemand, Level = AspNetHostingPermissionLevel.Minimal)]
  36         // attributes
  37 #if NET_2_0
  38         [ToolboxData ("<{0}:RequiredFieldValidator runat=\"server\" ErrorMessage=\"RequiredFieldValidator\"></{0}:RequiredFieldValidator>")]
  39 #else
  40         [ToolboxData ("<{0}:RequiredFieldValidator runat=server ErrorMessage=\"RequiredFieldValidator\"></{0}:RequiredFieldValidator>")]
  41 #endif
  42         public class RequiredFieldValidator : BaseValidator {
  43                 protected override void AddAttributesToRender (HtmlTextWriter w)
  44                 {
  45                         if (RenderUplevel) {
  46 #if NET_2_0
  47                                 RegisterExpandoAttribute (ClientID, "evaluationfunction", "RequiredFieldValidatorEvaluateIsValid");
  48                                 RegisterExpandoAttribute (ClientID, "initialvalue", InitialValue, true);
  49 #else
  50                                 w.AddAttribute ("evaluationfunction", "RequiredFieldValidatorEvaluateIsValid", false);
  51                                 w.AddAttribute ("initialvalue", InitialValue);
  52 #endif
  53                         }
  54
  55                         base.AddAttributesToRender (w);
  56                 }
  57
  58                 protected override bool EvaluateIsValid ()
  59                 {
  60                         return GetControlValidationValue (ControlToValidate) != InitialValue;
  61                 }
  62
  63
  64 #if NET_2_0
  65                 [Themeable(false)]
  66 #else
  67                 [Bindable(true)]
  68 #endif
  69                 [DefaultValue("")]
  70                 [WebSysDescription ("")]
  71                 [WebCategory ("Behavior")]
  72                 public string InitialValue {
  73                         get {
  74                                 return ViewState.GetString ("InitialValue", "");
  75                         }
  76                         set {
  77                                 ViewState ["InitialValue"] = value;
  78                         }
  79                 }
  80         }
  81 }