Reading integer from TextBox in MVC 3

Question

Good day all, what would be the best way to read a value from a text box in a view and to cast it into an integer in the corresponding controller?

View:

@{
    ViewBag.Title = "Index";
}

<h2>Administration</h2>

<p>
    Page number:
    @Html.TextBox("pageNumber")

    @Html.ActionLink("Fetch stats", "FetchStats", "Admin", null,
             new { @style = "text-transform:capitalize;" })


</p>

Controller:

public ActionResult FetchStats(int pageNumber)
    {
    CurrentGameNumber = pageNumber;
    [...]

    return View("Index");

}

Phil Klein · Accepted Answer · 2011-12-14 17:55:03Z

2

Here's a simple example. We'll add a textbox named "PageNumber" to the form within our View to post data to our FetchStats action method. MVC will take care of all of the plumbing, instantiating the controller and calling the FetchStats action method while provide pageNumber as an integer.

View

@{
    ViewBag.Title = "Index";
}

<h2>Administration</h2>

@using (Html.BeginForm("FetchStats", "Admin")) {    
<p>
    Page number:
    @Html.TextBox("pageNumber")

    <input type="submit" value="Fetch Stats" />
</p>
}

Action Method

[HttpPost]
public ActionResult FetchStats(int pageNumber)
{
    CurrentGameNumber = pageNumber;
}

edited Dec 14, 2011 at 17:55

answered Dec 14, 2011 at 17:41

Phil Klein

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4 Comments

Jean-François Beaulieu Over a year ago

I get this error : The parameters dictionary contains a null entry for parameter 'pageNumber' of non-nullable type 'System.Int32' for method 'System.Web.Mvc.ActionResult FetchStats(Int32)' in 'NHLStats2.Controllers.AdminController'. An optional parameter must be a reference type, a nullable type, or be declared as an optional parameter. Parameter name: parameters

Phil Klein Over a year ago

Can you update your question with a snippet from your view including the form and the PageNumber textbox?

Phil Klein Over a year ago

I've updated my answer. It this case form is required for us to issue the post to the FetchStats(int pageNumber) action method. That's also why I added the submit button. To use an action link, you would have to use some client-side scripting (likely jQuery) to modify the href of the link to perform a GET to the FetchStats method and include ?pageNumber=[PAGENUMBERHERE] as a query string parameter.

Jean-François Beaulieu Over a year ago

Works perfectly. Simple and efficient!

bobek · Accepted Answer · 2011-12-14 17:41:59Z

0

You can use either HttpPost with AJAX or regular function for that. Basically you need to create a model and then a text field that corresponds to the model variable. Then you can easily manipulate your model data in the Controller Action method. Please check this link. The author displays a way of creating a contact form which is basically your problem in a more expanded way : http://derans.blogspot.com/2011/05/contact-form-revisited-with-aspnet-mvc.html. I hope this helps.

answered Dec 14, 2011 at 17:41

bobek

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