Question

I’m trying to dynamically set the disabled attribute for the TextBoxFor HtmlHelper

@Html.TextBoxFor(model => model.Street, 
                 new
                 {
                    @class = "", 
                    disabled = (Model.StageID==(int)MyEnum.Sth) ? "disabled" : "" 
                 })

but even if there is disabled="" it is the same as disabled="disabled". How to get around of this ?

Answer 1

I have the same problem about month ago and I finished by using this extension method for it

public static class AttributesExtensions
{
    public static RouteValueDictionary DisabledIf(
        this object htmlAttributes, 
        bool disabled
    )
    {
        var attributes = new RouteValueDictionary(htmlAttributes);
        if (disabled)
        {
            attributes["disabled"] = "disabled";
        }
        return attributes;
    }
}

And after that you can use it like this

@Html.TextBoxFor(
    model => model.Street, 
    new { @class = "" }.DisabledIf(Model.StageID==(int)MyEnum.Sth)
)

EDIT (after Paul‘s comment):

The using of data-xxx html attributes may be mined by using the constructor of the System.Web.Routing.RouteValueDictionary class, since underscores will not be automatically converted to minus sign.

Use the method System.Web.Mvc.HtmlHelper.AnonymousObjectToHtmlAttributes instead: will solve this issue.

UPDATED CODE (Extension method body only)

var attributes = HtmlHelper.AnonymousObjectToHtmlAttributes(htmlAttributes);
if (disabled)
{
    attributes["disabled"] = "disabled";
}
return attributes;