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

   1 //
   2 // System.Web.UI.WebControls.CustomValidator.cs
   3 //
   4 // Authors:
   5 //   Gaurav Vaish (gvaish@iitk.ac.in)
   6 //   Andreas Nahr (ClassDevelopment@A-SoftTech.com)
   7 //
   8 // (C) Gaurav Vaish (2002)
   9 // (C) 2003 Andreas Nahr
  10 //
  11
  12 //
  13 // Permission is hereby granted, free of charge, to any person obtaining
  14 // a copy of this software and associated documentation files (the
  15 // "Software"), to deal in the Software without restriction, including
  16 // without limitation the rights to use, copy, modify, merge, publish,
  17 // distribute, sublicense, and/or sell copies of the Software, and to
  18 // permit persons to whom the Software is furnished to do so, subject to
  19 // the following conditions:
  20 //
  21 // The above copyright notice and this permission notice shall be
  22 // included in all copies or substantial portions of the Software.
  23 //
  24 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  28 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  29 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  30 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  31 //
  32
  33 using System;
  34 using System.Web;
  35 using System.Web.UI;
  36 using System.ComponentModel;
  37
  38 namespace System.Web.UI.WebControls
  39 {
  40         [DefaultEvent("ServerValidate")]
  41         [ToolboxData("<{0}:CustomValidator runat=\"server\""
  42                      + "ErrorMessage=\"CustomValidator\">"
  43                      + "</{0}:CustomValidator>")]
  44         public class CustomValidator : BaseValidator
  45         {
  46                 private static readonly object ServerValidateEvent = new object();
  47
  48                 public CustomValidator()
  49                 {
  50                 }
  51
  52                 [DefaultValue (""), WebCategory ("Behavior")]
  53                 [WebSysDescription ("A client script that performs the validation.")]
  54                 public string ClientValidationFunction
  55                 {
  56                         get
  57                         {
  58                                 object o = ViewState["ClientValidationFunction"];
  59                                 if(o != null)
  60                                 {
  61                                         return (string)o;
  62                                 }
  63                                 return String.Empty;
  64                         }
  65                         set
  66                         {
  67                                 ViewState["ClientValidationFunction"] = value;
  68                         }
  69                 }
  70
  71                 [WebSysDescription ("Raised for validation on the server.")]
  72                 public event ServerValidateEventHandler ServerValidate
  73                 {
  74                         add
  75                         {
  76                                 Events.AddHandler(ServerValidateEvent, value);
  77                         }
  78                         remove
  79                         {
  80                                 Events.RemoveHandler(ServerValidateEvent, value);
  81                         }
  82                 }
  83
  84                 protected override void AddAttributesToRender(HtmlTextWriter writer)
  85                 {
  86                         base.AddAttributesToRender(writer);
  87                         if(RenderUplevel)
  88                         {
  89                                 writer.AddAttribute("evaluationfunction", "CustomValidatorEvaluateIsValid");
  90                                 if(ClientValidationFunction.Length > 0)
  91                                 {
  92                                         writer.AddAttribute("clientvalidationfunction", ClientValidationFunction);
  93                                 }
  94                         }
  95                 }
  96
  97                 protected override bool ControlPropertiesValid()
  98                 {
  99                         if(ControlToValidate.Length > 0)
 100                         {
 101                                 CheckControlValidationProperty(ControlToValidate, "ControlToValidate");
 102                         }
 103                         return true;
 104                 }
 105
 106                 protected virtual bool OnServerValidate(string value)
 107                 {
 108                         if(Events != null)
 109                         {
 110                                 ServerValidateEventHandler sveh = (ServerValidateEventHandler)(Events[ServerValidateEvent]);
 111                                 if(sveh != null)
 112                                 {
 113                                         ServerValidateEventArgs args = new ServerValidateEventArgs(value, true);
 114                                         sveh(this, args);
 115                                         return args.IsValid;
 116                                 }
 117                         }
 118                         return true;
 119                 }
 120
 121                 protected override bool EvaluateIsValid()
 122                 {
 123                         string ctrl = ControlToValidate;
 124                         if(ctrl.Length > 0)
 125                         {
 126                                 ctrl = GetControlValidationValue(ctrl);
 127                                 if(ctrl== null || ctrl.Length == 0)
 128                                 {
 129                                         return true;
 130                                 }
 131                         }
 132                         return OnServerValidate(ctrl);
 133                 }
 134         }
 135 }