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

   1 /**\r
   2  * Namespace: System.Web.UI.WebControls\r
   3  * Class:     RequiredFieldValidator\r
   4  *\r
   5  * Author:  Gaurav Vaish\r
   6  * Maintainer: gvaish@iitk.ac.in\r
   7  * Contact: <my_scripts2001@yahoo.com>, <gvaish@iitk.ac.in>\r
   8  * Implementation: yes\r
   9  * Status:  100%\r
  10  *\r
  11  * (C) Gaurav Vaish (2002)\r
  12  */
  13
  14 using System.ComponentModel;\r
  15 \r
  16 namespace System.Web.UI.WebControls\r
  17 {\r
  18         [ToolboxData("<{0}:RequiredFieldValidator runat=\"server\" "\r
  19                    + "ErrorMessage=\"RequiredFieldValidator\">"\r
  20                    + "</{0}:RequiredFieldValidator>")]\r
  21         public class RequiredFieldValidator : BaseValidator\r
  22         {\r
  23                 public RequiredFieldValidator(): base()\r
  24                 {\r
  25                 }\r
  26
  27                 [DefaultValue (""), Bindable (true), WebCategory ("Behavior")]
  28                 [WebSysDescription ("The initial value for the required field.")]\r
  29                 public string InitialValue\r
  30                 {\r
  31                         get\r
  32                         {\r
  33                                 object o = ViewState["InitialValue"];\r
  34                                 if(o != null)\r
  35                                         return (String)o;\r
  36                                 return String.Empty;\r
  37                         }\r
  38                         set\r
  39                         {\r
  40                                 ViewState["InitialValue"] = value;\r
  41                         }\r
  42                 }\r
  43 \r
  44                 protected override void AddAttributesToRender(HtmlTextWriter writer)\r
  45                 {\r
  46                         base.AddAttributesToRender(writer);\r
  47                         if(RenderUplevel)\r
  48                         {\r
  49                                 writer.AddAttribute("evaluationfunction", "RequiredFieldValidatorEvaluateIsValid");\r
  50                                 writer.AddAttribute("initialvalue", InitialValue);\r
  51                         }\r
  52                 }\r
  53 \r
  54                 protected override bool EvaluateIsValid()\r
  55                 {\r
  56                         string val = GetControlValidationValue(ControlToValidate);\r
  57                         if(val != null)\r
  58                         {\r
  59                                 return (val.Trim() != InitialValue.Trim());\r
  60                         }\r
  61                         return true;\r
  62                 }\r
  63         }\r
  64 }\r