Set disable attribute based on a condition for Html TextBoxFor

Question

I want to set disable attribute based on a condition for Html TextBoxFor in asp net MVC like below   Html TextBoxFor model   gt  model ExpireDate  new   style    width  70px    maxlength    10   id    expire-date  disabled    Model ExpireDate    null    disable             This helper has two output disabled  disabled   or disabled     both of theme make the textbox disable   I want to disable the textbox if Model ExpireDate    null else I want to enable it

User · Answer

Actually  the internal behavior is translating the anonymous object to a dictionary  So what I do in these scenarios is go for a dictionary        var htmlAttributes   new Dictionary lt string  object gt             class     form-control           placeholder    Why                    if  Model IsDisabled          htmlAttributes Add  disabled    disabled           Html EditorFor m   gt  m Description  new   htmlAttributes   htmlAttributes      Or  as Stephen commented here    Html EditorFor m   gt  m Description      Model IsDisabled    object new   disabled    disabled       object new

User · Answer

if you dont want to use Html Helpers take look it my solution   disabled    your Expression that returns true or false      that it          bool isManager    Session  User   as User  IsManager     lt textarea rows  4  name  LetterManagerNotes  disabled     isManager   gt  lt  textarea gt    and I think the better way to do it is to do that check in the controller and save it within a variable that is accessible inside the view Razor engine  in order to make the view free from business logic

User · Answer

Another approach is to disable the text box on the client side    In your case you have only one textbox that you need to disable but consider the case where you have multiple input  select  and textarea fields that yout need to disable    It is much easier to do it via jquery    since we can not rely on data coming from the client  add some logic to the controller to prevent these fields from being saved   Here is an example    lt input id  document Status  name  document Status  type  hidden  value  2    gt     document  ready function           disableAll       function disableAll       var status       document Status   val       if  status    0             input   attr  disabled   true            textarea   attr  disabled   true            select   attr  disabled   true

User · Answer

The valid way is   disabled  disabled    Browsers also might accept disabled    but I would recommend you the first approach   Now this being said I would recommend you writing a custom HTML helper in order to encapsulate this disabling functionality into a reusable piece of code   using System  using System Linq Expressions  using System Web  using System Web Mvc  using System Web Mvc Html  using System Web Routing   public static class HtmlExtensions       public static IHtmlString MyTextBoxFor lt TModel  TProperty gt           this HtmlHelper lt TModel gt  htmlHelper           Expression lt Func lt TModel  TProperty gt  gt  expression           object htmlAttributes           bool disabled                     var attributes   new RouteValueDictionary htmlAttributes           if  disabled                        attributes  disabled      disabled                     return htmlHelper TextBoxFor expression  attributes             which you could use like this    Html MyTextBoxFor      model   gt  model ExpireDate       new            style    width  70px             maxlength    10            id    expire-date               Model ExpireDate    null       and you could bring even more intelligence into this helper   public static class HtmlExtensions       public static IHtmlString MyTextBoxFor lt TModel  TProperty gt           this HtmlHelper lt TModel gt  htmlHelper          Expression lt Func lt TModel  TProperty gt  gt  expression          object htmlAttributes                     var attributes   new RouteValueDictionary htmlAttributes           var metaData   ModelMetadata FromLambdaExpression expression  htmlHelper ViewData           if  metaData Model    null                        attributes  disabled      disabled                     return htmlHelper TextBoxFor expression  attributes             so that now you no longer need to specify the disabled condition    Html MyTextBoxFor      model   gt  model ExpireDate       new            style    width  70px             maxlength    10            id    expire-date

User · Answer

I like the extension method approach so you don t have to pass through all possible parameters  However using Regular expressions can be quite tricky  and somewhat slower  so I used XDocument instead   public static MvcHtmlString SetDisabled this MvcHtmlString html  bool isDisabled        var xDocument   XDocument Parse html ToHtmlString         if    xDocument FirstNode is XElement element                 return html             element SetAttributeValue  disabled   isDisabled    disabled    null       return MvcHtmlString Create element ToString         Use the extension method like this   Html EditorFor m   gt  m MyProperty  SetDisabled Model ExpireDate    null

User · Answer

This is late  but may be helpful to some people     I have extended  DarinDimitrov s answer to allow for passing a second object that takes any number of boolean html attributes like disabled  disabled  checked  checked   selected  selected  etc     It will render the attribute only if the property value is true  anything else and the attribute will not be rendered at all     The custom reuseble HtmlHelper   public static class HtmlExtensions       public static IHtmlString MyTextBoxFor lt TModel  TProperty gt  this HtmlHelper lt TModel gt  htmlHelper                                                                  Expression lt Func lt TModel  TProperty gt  gt  expression                                                                  object htmlAttributes                                                                  object booleanHtmlAttributes                var attributes   new RouteValueDictionary htmlAttributes              Reflect over the properties of the newly added booleanHtmlAttributes object         foreach  var prop in booleanHtmlAttributes GetType   GetProperties                            Find only the properties that are true and inject into the main attributes                and discard the rest              if  ValueIsTrue prop GetValue booleanHtmlAttributes  null                                  attributes prop Name    prop Name                                                                                   return htmlHelper TextBoxFor expression  attributes              private static bool ValueIsTrue object obj                bool res   false          try                       res   Convert ToBoolean obj                     catch  FormatException                        res   false                    catch InvalidCastException                        res   false                    return res             Which you can use like so    Html MyTextBoxFor m   gt  Model Employee Name                      new    class    x-large    placeholder    Type something                            new   disabled   true

User · Answer

One simple approach I have used is conditional rendering     Model ExpireDate    null       Html TextBoxFor m   gt  m ExpireDate  new    disabled    disabled           Html TextBoxFor m   gt  m ExpireDate

User · Answer

I like Darin method  But quick way to solve this   Html TextBox  Expiry   null  new   style    width  70px    maxlength    10   id    expire-date   disabled    disabled     ToString   Replace  disabled   disabled      1    2         disabled   disabled

User · Answer

I achieved it using some extension methods  private const string endFieldPattern           gt         public static MvcHtmlString IsDisabled this MvcHtmlString htmlString  bool disabled                string rawString   htmlString ToString            if  disabled                        rawString   Regex Replace rawString  endFieldPattern    1 disabled   disabled   gt                        return new MvcHtmlString rawString              public static MvcHtmlString IsReadonly this MvcHtmlString htmlString  bool  readonly                string rawString   htmlString ToString            if   readonly                        rawString   Regex Replace rawString  endFieldPattern    1 readonly   readonly   gt                        return new MvcHtmlString rawString           and then       Html TextBoxFor model   gt  model Name  new    class   someclass    IsDisabled Model ExpireDate    null

User · Answer

Yet another solution would be to create a Dictionary lt string  object gt  before calling TextBoxFor and pass that dictionary  In the dictionary  add  disabled  key only if the textbox is to be diabled  Not the neatest solution but simple and straightforward

User · Answer

Is solved this using RouteValueDictionary  works fine as htmlAttributes as it s based on IDictionary  and an extension method    public static RouteValueDictionary AddIf this RouteValueDictionary dict  bool condition  string name  object value        if  condition  dict Add name  value       return dict      Usage     Html TextBoxFor m   gt  m GovId  new RouteValueDictionary new    class    form-control      AddIf Model IsEntityFieldsLocked   disabled    disabled      Credit goes to https   stackoverflow com a 3481969 40939

User · Answer

If you don t use html helpers you may use simple ternary expression like this    lt input name  Field         value   Model Field  tabindex  0           Model IsDisabledField    disabled   disabled          gt

[asp.net-mvc] Set disable attribute based on a condition for Html.TextBoxFor

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