ASP.NET MVC Html.TextBoxFor rendered different value than <%: Model.value %>

Question

This is very strange and I don't know why. I have a ViewModel that return some value for my object, when rendering it, they have different values, yet, they points to the same property:

<%: Model.myProperty %>

That returns "25", which is what I've set the property to be. But when rendered it as an textbox, it returned "0" as the value for my textbox!

<%: Html.TextBoxFor(f => f.myProperty) %>

Any idea why? The property is of decimal type. Thanks.

That code won't compile. Typo? Should be <%= Html.TextBoxFor(f => f.myProperty) %>. — djdd87
– djdd87, Commented Sep 2, 2010 at 21:10
I have some logic before that to determine the value for myProperty, then something like this: var model = new MyViewModel { myProperty = 25 }; When I run the debug, it clearly displaying myProperty = 25, and it reflects when rendering it as text, but for the textbox, somehow it didn't! Thanks. — Saxman
– Saxman, Commented Sep 2, 2010 at 21:12
@Saxman - No problem... I think we might need to see your model and property here though. — djdd87
– djdd87, Commented Sep 2, 2010 at 21:22

Jake Hoffner · Accepted Answer · 2011-01-12 05:55:45Z

16

Try ModelState.Clear() before calling View or PartialView and passing in the model.

This issue was happening for me after doing a post. Its because the HTML helpers get their value from ModelState first before checking the actual model. Seems like this should be reversed IMO.

answered Jan 12, 2011 at 5:55

Jake Hoffner

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Jordan Rieger Over a year ago

I agree, it's not desirable behavior in many scenarios. Here's another relevant question: stackoverflow.com/questions/1775170/….

SAVJunior · Accepted Answer · 2013-07-07 02:05:03Z

2

Having the same problem, I read this post today (and it’s solved my problem) and decided to investigate more regarding it. So, here is what I found:

“ASP.NET MVC assumes that if you are rendering a View in response to an HTTP POST, and you are using the Html Helpers, then you are most likely to be redisplaying a form that has failed validation. Therefore, the Html Helpers actually check in ModelState for the value to display in a field before they look in the Model.” By: Simon J Ince

If you want read more about this, access the link bellow: http://blogs.msdn.com/b/simonince/archive/2010/05/05/asp-net-mvc-s-html-helpers-render-the-wrong-value.aspx

See you.

answered Jul 7, 2013 at 2:05

SAVJunior

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Saxman · Accepted Answer · 2010-09-02 21:25:31Z

0

My bad, seems like the problem is in the HTML, where I have the view rendered from multiple partial views, and some of the ID for the input are the same (I hide the edit view and rendered the main view using jQuery), somehow this textbox picks up the value from the view that was hidden!!! :)

Thanks all for looking.

answered Sep 2, 2010 at 21:25

Saxman

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