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
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   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
  18 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  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 /**\r
  23  * Namespace: System.Web.UI.WebControls\r
  24  * Class:     RequiredFieldValidator\r
  25  *\r
  26  * Author:  Gaurav Vaish\r
  27  * Maintainer: gvaish@iitk.ac.in\r
  28  * Contact: <my_scripts2001@yahoo.com>, <gvaish@iitk.ac.in>\r
  29  * Implementation: yes\r
  30  * Status:  100%\r
  31  *\r
  32  * (C) Gaurav Vaish (2002)\r
  33  */
  34
  35 using System.ComponentModel;\r
  36 \r
  37 namespace System.Web.UI.WebControls\r
  38 {\r
  39         [ToolboxData("<{0}:RequiredFieldValidator runat=\"server\" "\r
  40                    + "ErrorMessage=\"RequiredFieldValidator\">"\r
  41                    + "</{0}:RequiredFieldValidator>")]\r
  42         public class RequiredFieldValidator : BaseValidator\r
  43         {\r
  44                 public RequiredFieldValidator(): base()\r
  45                 {\r
  46                 }\r
  47
  48                 [DefaultValue (""), Bindable (true), WebCategory ("Behavior")]
  49                 [WebSysDescription ("The initial value for the required field.")]\r
  50                 public string InitialValue\r
  51                 {\r
  52                         get\r
  53                         {\r
  54                                 object o = ViewState["InitialValue"];\r
  55                                 if(o != null)\r
  56                                         return (String)o;\r
  57                                 return String.Empty;\r
  58                         }\r
  59                         set\r
  60                         {\r
  61                                 ViewState["InitialValue"] = value;\r
  62                         }\r
  63                 }\r
  64 \r
  65                 protected override void AddAttributesToRender(HtmlTextWriter writer)\r
  66                 {\r
  67                         base.AddAttributesToRender(writer);\r
  68                         if(RenderUplevel)\r
  69                         {\r
  70                                 writer.AddAttribute("evaluationfunction", "RequiredFieldValidatorEvaluateIsValid");\r
  71                                 writer.AddAttribute("initialvalue", InitialValue);\r
  72                         }\r
  73                 }\r
  74 \r
  75                 protected override bool EvaluateIsValid()\r
  76                 {\r
  77                         string val = GetControlValidationValue(ControlToValidate);\r
  78                         if(val != null)\r
  79                         {\r
  80                                 return (val.Trim() != InitialValue.Trim());\r
  81                         }\r
  82                         return true;\r
  83                 }\r
  84         }\r
  85 }\r