What does Html.HiddenFor do?

Question

Although I have read the documentation on Html.HiddenFor, I've not grasped what is it used for...

Could somebody explain its uses and give a short example?

Where should those helpers go in the code?

Answer 1

It creates a hidden input on the form for the field (from your model) that you pass it.

It is useful for fields in your Model/ViewModel that you need to persist on the page and have passed back when another call is made but shouldn't be seen by the user.

Consider the following ViewModel class:

public class ViewModel {     public string Value { get; set; }     public int Id { get; set; } } 

Now you want the edit page to store the ID but have it not be seen:

<% using(Html.BeginForm() { %>     <%= Html.HiddenFor(model.Id) %><br />     <%= Html.TextBoxFor(model.Value) %> <% } %> 

This results in the equivalent of the following HTML:

<form name="form1">     <input type="hidden" name="Id">2</input>     <input type="text" name="Value" value="Some Text" /> </form>