HTML HiddenFor value set

Question

Html HiddenFor model   gt  model title  new   id   natureOfVisitField    value     Model title      it doesen t work  how to set the value

User · Answer

It is just Value  not  value   Try it  I m not sure about  Model title  maybe it s just Model title

User · Answer

Necroing this question because I recently ran into the problem myself  when trying to add a related property to an existing entity  I just ended up making a nice extension method       public static MvcHtmlString HiddenFor lt TModel  TProperty gt  this HtmlHelper lt TModel gt  htmlHelper  Expression lt Func lt TModel  TProperty gt  gt  expression  TProperty value                string expressionText   ExpressionHelper GetExpressionText expression           string propertyName   htmlHelper ViewContext ViewData TemplateInfo GetFullHtmlFieldName expressionText            return htmlHelper Hidden propertyName  value           Use like so    Html HiddenFor m   gt  m RELATED ID  Related Id    Note that this has a similar signature to the built-in HiddenFor  but uses generic typing  so if Value is of type System Object  you ll actually be invoking the one built into the framework  Not sure why you d be editing a property of type System Object in your views though

User · Answer

For setting value in hidden field do in the following way    Html HiddenFor model   gt  model title                   new   id   natureOfVisitField   Value    Model title     It will work

User · Answer

The   symbol when specifying HtmlAttributes is used when the  thing  you are trying to set is a keyword c   So for instance the word class  you cannot specify class  you must use  class

User · Answer

You can do this way   Html HiddenFor model  gt model title  new  ng init   string Format  model title   0     Model title

User · Answer

Strange but  Try with  Value   capital  V   e g   working on MVC4    Html HiddenFor m   gt  m Id  new    Value   Model Id      Update   Found that  Value  capital V  is creating another attribute with  Value  along with  value   using small  value seems to be working too    Need to check the MVC source code to find more     Update  After going through how it works internally   First of all forget all these workarounds  I have kept in for the sake of continuity here   now looks silly     Basically  it happens when a model is posted and the model is returned back to same page   The value is accessed  and formed into html  in InputHelper method  InputExtensions cs  using following code fragment  string attemptedValue    string htmlHelper GetModelStateValue fullName  typeof string      The GetModelStateValue method  in Htmlelper cs  retrieves the value as  ViewData ModelState TryGetValue key  out modelState    Here is the issue  since the value is accessed from ViewData ModelState dictionary  This returns the value posted from the page instead of modified value    i e  If your posted value of the variable  e g  Person Id  is 0 but you set the value inside httpPost action  e g  Person Id   2   the ModelState still retains the old value  0  and the attemptedValue contains  0    so the field in rendered page will contain  0  as value    Workaround if you are returning model to same page   Clear the item from ModelState    e g    ModelState Remove  Id       This will remove the item from dictionary and the      ViewData ModelState TryGetValue key  out modelState  returns null  and the next statement  inside InputExtensions cs  takes the actual value  valueParameter  passed to      HiddenFor m    m Id   this is done in the following line in InputExtensions cs  tagBuilder MergeAttribute  value   attemptedValue      useViewData    htmlHelper EvalString fullName  format    valueParameter   isExplicitValue     Summary   Clear the item in ModelState using   ModelState Remove           Hope this is helpful

User · Answer

You shouldn t need to set the value in the attributes parameter  MVC should automatically bind it for you    Html HiddenFor model   gt  model title  new   id   natureOfVisitField

[asp.net-mvc] HTML.HiddenFor value set

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