What is readonly for in a disabled TextBoxFor?

Question

I have two different ways to use a DISABLED TextBoxFor, which is:

@Html.TextBoxFor(u => u.Visibilidade, new { disabled = "disabled", @readonly = "readonly" })

and

@Html.TextBoxFor(u => u.Visibilidade, new { disabled = "disabled" })

ie. using or not readonly property

What is the difference, considering that a disabled field will not be changed any way?

Thanks in advance

Answer 1

Note: If you want it to be disabled, but you do want the original value to be posted with the form, you can use a HiddenFor along with your TextboxFor (with id set to null so the browser console doesn't complain about duplicate ids):

@Html.TextBoxFor(u => u.Visibilidade, new { @disabled = "disabled"})
@Html.HiddenFor(u => u.Visibilidade, new { id = null });

This way, the value from the HiddenFor will be posted with the form, but the textbox will be displayed as disabled.