Setting html attribute that is reserved keyword in Html.CheckBoxFor in ASP.NET MVC

Question

Hi, I am using the HtmlHelper to create a checkbox in my view like so:

<%= Html.CheckBoxFor(model => model.SeatOnly, new { checked = "checked" })%>

However, an error is being thrown as checked is a reserved keyword. I have found a couple of people saying that you must use the 'reserved word prefix' and simply put an uderscore in front of the attribute like so:

<%= Html.CheckBoxFor(model => model.SeatOnly, new { _checked = "checked" })%>

This does not generate an error but in the generated html the attribute is actually '_checked' which means it doesn't work (if I use firebug and remove the underscore the attribute then takes effect).

Does anyone know a way around this while still using CheckBoxFor?

Thanks

Answer 1

<%= Html.CheckBoxFor(model => model.SeatOnly, new { @checked = "checked" })%>

You need to prefix it with an '@' :-)

Update

Just tested with the following and works. Try this ...

Model

public class MyModel
{
    public bool SomeBooleanValue { get; set; }
    public string Title { get; set; }
}

View (snipped to only the important bits)

<%= Html.TextBoxFor(x => x.Title) %>

<%= Html.CheckBoxFor(x => x.SomeBooleanValue, new { @checked = "checked" }) %>

Answer 2

Use @checked

Also occurs with the attribute class (reserved word), them use @class

Answer 3

I couldn't figure out a way to get the HtmlHelper to register the checked attribute so I simple used Html.CheckBox("SeatOnly", true) instead. This way the property in my view model is still being set and the checkbox is checked.

This is fine but I would still be interested in knowing why @checked doesn't work in the same way as @class.

Answer 4

I had the same problem: the "checked" attribute was always omitted in the html code. i solved the problem by passing "true" into the model. snippet looks like this:

MyModel model = new MyModel();
model.SomeBooleanValue = true;

As you connect the Checkbox with the Model the checkbox always shows the value the model has. If the value in your model is "false" the checkbox will always be unchecked.

Maybe this helps ..