Set disable attribute based on a condition for Html.TextBoxFor
The valid way is:
disabled="disabled"
Browsers also might accept disabled=""
but I would recommend you the first approach.
Now this being said I would recommend you writing a custom HTML helper in order to encapsulate this disabling functionality into a reusable piece of code:
using System;
using System.Linq.Expressions;
using System.Web;
using System.Web.Mvc;
using System.Web.Mvc.Html;
using System.Web.Routing;
public static class HtmlExtensions
{
public static IHtmlString MyTextBoxFor<TModel, TProperty>(
this HtmlHelper<TModel> htmlHelper,
Expression<Func<TModel, TProperty>> expression,
object htmlAttributes,
bool disabled
)
{
var attributes = new RouteValueDictionary(htmlAttributes);
if (disabled)
{
attributes["disabled"] = "disabled";
}
return htmlHelper.TextBoxFor(expression, attributes);
}
}
which you could use like this:
@Html.MyTextBoxFor(
model => model.ExpireDate,
new {
style = "width: 70px;",
maxlength = "10",
id = "expire-date"
},
Model.ExpireDate == null
)
and you could bring even more intelligence into this helper:
public static class HtmlExtensions
{
public static IHtmlString MyTextBoxFor<TModel, TProperty>(
this HtmlHelper<TModel> htmlHelper,
Expression<Func<TModel, TProperty>> expression,
object htmlAttributes
)
{
var attributes = new RouteValueDictionary(htmlAttributes);
var metaData = ModelMetadata.FromLambdaExpression(expression, htmlHelper.ViewData);
if (metaData.Model == null)
{
attributes["disabled"] = "disabled";
}
return htmlHelper.TextBoxFor(expression, attributes);
}
}
so that now you no longer need to specify the disabled condition:
@Html.MyTextBoxFor(
model => model.ExpireDate,
new {
style = "width: 70px;",
maxlength = "10",
id = "expire-date"
}
)
Actually, the internal behavior is translating the anonymous object to a dictionary. So what I do in these scenarios is go for a dictionary:
@{
var htmlAttributes = new Dictionary<string, object>
{
{ "class" , "form-control"},
{ "placeholder", "Why?" }
};
if (Model.IsDisabled)
{
htmlAttributes.Add("disabled", "disabled");
}
}
@Html.EditorFor(m => m.Description, new { htmlAttributes = htmlAttributes })
Or, as Stephen commented here:
@Html.EditorFor(m => m.Description,
Model.IsDisabled ? (object)new { disabled = "disabled" } : (object)new { })
I like Darin method. But quick way to solve this,
Html.TextBox("Expiry", null, new { style = "width: 70px;", maxlength = "10", id = "expire-date", disabled = "disabled" }).ToString().Replace("disabled=\"disabled\"", (1 == 2 ? "" : "disabled=\"disabled\""))
One simple approach I have used is conditional rendering:
@(Model.ExpireDate == null ?
@Html.TextBoxFor(m => m.ExpireDate, new { @disabled = "disabled" }) :
@Html.TextBoxFor(m => m.ExpireDate)
)