MVC3 Conditionally disable Html.TextBoxFor()

Question

I have a C# .Net web app. In that app I need to conditionally disable Html.TextBoxFor controls (also Html.DropDownListFor controls) based on who is

Answer 1

Extending @James's answer, I wrote this HtmlHelper extension that updates/removes the disabled attribute if it's already present, or adds it if not:

public static MvcHtmlString Disable(this MvcHtmlString helper, bool disabled) {
    string html = helper.ToString();
    var regex = new Regex("(disabled(?:=\".*\")?)");
    if (regex.IsMatch(html)) {
        html = regex.Replace(html, disabled ? "disabled=\"disabled\"" : "", 1);
    } else {
        regex = new Regex(@"(\/?>)");
        html = regex.Replace(html, disabled ? "disabled=\"disabled\"$1" : "$1", 1);
    }
    return MvcHtmlString.Create(html);
}

It also plays nicely with self-closing tags (like ).

Usage is the same:

@Html.TextBoxFor(model => model.PropertyName).Disable(true)

Tested on both @Html.DropDownListFor() and @Html.TextBoxFor().