How to set a hidden value in Razor

Question

I know that what I m trying to do is bad idea  but I have specific constrains for now   I have multiple sites  using one and the same MVC3 code base  For one of them the requirement is to hide some required fields from the form   I know that the best approach is to modify the controller to set the defaults for these fields  but I d like to achieve this modifying only the view for this particular site w o changing the code   So  how do I set a particular model property to a default value in the view  The ideal should be something like    Html HiddenFor model   gt  model RequiredProperty   model RequiredProperty    default    EDIT  more explanation  So  actually this is in a sub-view  which is used by 2 different main views  I need these properties set only if one particular main view is used  and not the others   So  I guess the setting to default need to go to that particular  main  view  Looks like I can not use HiddenFor in the sub-view  and then Html Hidden in the main   Is there a way to check in the sub-view which is the outer view

User · Answer

While I would have gone with Piotr s answer  because it s all in one line   I was surprised that your sample is closer to your solution than you think  From what you have  you simply assign the model value before you use the Html helper method     Model RequiredProperty    default     Html HiddenFor model   gt  model RequiredProperty

User · Answer

How about like this  public static MvcHtmlString HiddenFor lt TModel  TProperty gt  this HtmlHelper lt TModel gt  htmlHelper  Expression lt Func lt TModel  TProperty gt  gt  expression  object value  object htmlAttributes                return HiddenFor htmlHelper  expression  value  HtmlHelper AnonymousObjectToHtmlAttributes htmlAttributes               public static MvcHtmlString HiddenFor lt TModel  TProperty gt  this HtmlHelper lt TModel gt  htmlHelper  Expression lt Func lt TModel  TProperty gt  gt  expression  object value  IDictionary lt string  object gt  htmlAttributes                return htmlHelper Hidden ExpressionHelper GetExpressionText expression   value  htmlAttributes           Use it like this    Html HiddenFor customerId   gt  reviewModel CustomerId  Site LoggedInCustomerId  null

User · Answer

There is a Hidden helper alongside HiddenFor which lets you set the value     Html Hidden  RequiredProperty    default     EDIT Based on the edit you ve made to the question  you could do this  but I believe you re moving into territory where it will be cheaper and more effective  in the long run  to fight for making the code change  As has been said  even by yourself  the controller or view model should be setting the default    This code    lt ul gt             var stacks   new System Diagnostics StackTrace   GetFrames            foreach  var frame in stacks                         lt li gt  frame GetMethod   Name -  frame GetMethod   DeclaringType lt  li gt               lt  ul gt    Will give output like this   Execute - ASP  Page Views ViewDirectoryX  SubView cshtml ExecutePageHierarchy - System Web WebPages WebPageBase ExecutePageHierarchy - System Web Mvc WebViewPage ExecutePageHierarchy - System Web WebPages WebPageBase RenderView - System Web Mvc RazorView Render - System Web Mvc BuildManagerCompiledView RenderPartialInternal - System Web Mvc HtmlHelper RenderPartial - System Web Mvc Html RenderPartialExtensions Execute - ASP  Page Views ViewDirectoryY  MainView cshtml   So assuming the MVC framework will always go through the same stack  you can grab var frame   stacks 8   and use the declaring type to determine who your parent view is  and then use that determination to set  or not  the default value  You could also walk the stack instead of directly grabbing  8  which would be safer but even less efficient

User · Answer

If I understand correct you will have something like this    lt input value  default  id  sth  name  sth  type  hidden  gt    And to get it you have to write    Html HiddenFor m   gt  m sth  new   Value    default       for Strongly-typed view

[asp.net-mvc-3] How to set a hidden value in Razor

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