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

   1
   2 //
   3 // Permission is hereby granted, free of charge, to any person obtaining
   4 // a copy of this software and associated documentation files (the
   5 // "Software"), to deal in the Software without restriction, including
   6 // without limitation the rights to use, copy, modify, merge, publish,
   7 // distribute, sublicense, and/or sell copies of the Software, and to
   8 // permit persons to whom the Software is furnished to do so, subject to
   9 // the following conditions:
  10 //
  11 // The above copyright notice and this permission notice shall be
  12 // included in all copies or substantial portions of the Software.
  13 //
  14 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  15 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  16 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  17 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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  19 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  20 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  21 //
  22 /**
  23  * Namespace: System.Web.UI.WebControls
  24  * Class:     RequiredFieldValidator
  25  *
  26  * Author:  Gaurav Vaish
  27  * Maintainer: gvaish@iitk.ac.in
  28  * Contact: <my_scripts2001@yahoo.com>, <gvaish@iitk.ac.in>
  29  * Implementation: yes
  30  * Status:  100%
  31  *
  32  * (C) Gaurav Vaish (2002)
  33  */
  34
  35 using System.ComponentModel;
  36
  37 namespace System.Web.UI.WebControls
  38 {
  39         [ToolboxData("<{0}:RequiredFieldValidator runat=\"server\" "
  40                    + "ErrorMessage=\"RequiredFieldValidator\">"
  41                    + "</{0}:RequiredFieldValidator>")]
  42         public class RequiredFieldValidator : BaseValidator
  43         {
  44                 public RequiredFieldValidator(): base()
  45                 {
  46                 }
  47
  48                 [DefaultValue (""), Bindable (true), WebCategory ("Behavior")]
  49                 [WebSysDescription ("The initial value for the required field.")]
  50                 public string InitialValue
  51                 {
  52                         get
  53                         {
  54                                 object o = ViewState["InitialValue"];
  55                                 if(o != null)
  56                                         return (String)o;
  57                                 return String.Empty;
  58                         }
  59                         set
  60                         {
  61                                 ViewState["InitialValue"] = value;
  62                         }
  63                 }
  64
  65                 protected override void AddAttributesToRender(HtmlTextWriter writer)
  66                 {
  67                         base.AddAttributesToRender(writer);
  68                         if(RenderUplevel)
  69                         {
  70                                 writer.AddAttribute("evaluationfunction", "RequiredFieldValidatorEvaluateIsValid");
  71                                 writer.AddAttribute("initialvalue", InitialValue);
  72                         }
  73                 }
  74
  75                 protected override bool EvaluateIsValid()
  76                 {
  77                         string val = GetControlValidationValue(ControlToValidate);
  78                         if(val != null)
  79                         {
  80                                 return (val.Trim() != InitialValue.Trim());
  81                         }
  82                         return true;
  83                 }
  84         }
  85 }