How do I populate HTML content with new values once data has been changed on postback?

Question

I have MVC3 razor application. Once I'm submitting a form and in Action i'm changing ViewModel content, i can't see new values populated.

There was a topic about that in MVC2 where guys told that it may be fixed in MVC3 http://aspnet.codeplex.com/workitem/5089?ProjectName=aspnet

Can you tell if there is an option to do that or what is the better way(workaround) to update UI without JavaScript using postbacks?

Action:

[HttpPost]
public ActionResult Index(MyViewModel model)
{
    model.Value = "new value"
    return View("Index", model);
}

UI:

@Html.HiddenFor(x => x.Value)

ViewModel:

public class MyViewModel
{
   public string Value { get;set; }
}

score 1 · Accepted Answer · answered Dec 14 '12 at 13:38

1

Looks like it's using the ModelState values that were posted.

If you clear the ModelState using ModelState.Clear() the new value you set should be in the hidden field.

answered Dec 14 '12 at 13:38

Richard Dalton

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AliRıza Adıyahşi · Answer 2 · 2012-12-14T13:43:10.310

You should use form and to post it to action.

@model MyViewModel

@using (Html.BeginForm("Index", "Home", FormMethod.Post))
{
    @Html.HiddenFor(x=>x.Value)
    <input type="submit" value="Submit" />
}

Controller

//
public ActionResult Index()
{
    MyViewModel model = new MyViewModel();
    model.Value = "old value";

    return View("Index", model);
}

[HttpPost]
public ActionResult Index(MyViewModel model)
{
    //get posted model values (changed value by view "new value")
    string changed_value = model.Value;

    // you can return model again if your model.State is false or after update
    return View("Index", model);
}

How do I populate HTML content with new values once data has been changed on postback?

2 Answers2