Create a custom HtmlHelper.TextBoxFor() to display label text as “placeholder” integrated with twitter bootstrap

We have TextBoxFor() and LabelFor() in MVC, they are binded with my model. If you are using twitter bootstrap and want to display the model property label as a placeholder in textboxes, what should you do.

Here is what I have done.

My model:

public class User
{
    [Display(Name="User name")]
    public string Username {get;set;}
}

Normally in the view we put,

@model User

<ol>
    <li>
        @Html.LabelFor(p=&gt;p.Username)
        @Html.TextBoxFor(p=&gt;p.Username)
    </li>
</ol>

image

If you want to display it as placeholder in twitter bootstrap,

image

Let’s create a TextBoxPlaceHolderFor() extension method of the htmlhelpers, remember to reference the namespace,

using System.Web.Mvc.Html;

So you can re-use the HtmlHelper.TextBoxFor() in your TextBoxPlaceHolderFor() method.

Here is the code with three overloads,

public static class TextBoxForExtensions
    {
        public static MvcHtmlString TextBoxPlaceHolderFor(this HtmlHelper html, Expression<Func> expression, object htmlAttributes)
        {
            var dict = new RouteValueDictionary(htmlAttributes);
            return html.TextBoxPlaceHolderFor(expression, dict);
        }
        public static MvcHtmlString TextBoxPlaceHolderFor(this HtmlHelper html, Expression<Func> expression)
        {
            var htmlAttributes = new Dictionary();
            return html.TextBoxPlaceHolderFor(expression, htmlAttributes);
        }

        public static MvcHtmlString TextBoxPlaceHolderFor(this HtmlHelper html, Expression<Func> expression, IDictionary htmlAttributes)
        {
            ModelMetadata metadata = ModelMetadata.FromLambdaExpression(expression, html.ViewData);
            string htmlFieldName = ExpressionHelper.GetExpressionText(expression);
            string labelText = metadata.DisplayName ?? metadata.PropertyName ?? htmlFieldName.Split('.').Last();
            if (!String.IsNullOrEmpty(labelText))
            {
                if (htmlAttributes == null )
                {
                    htmlAttributes = new Dictionary();
                }
                htmlAttributes.Add("placeholder", labelText);
            }
            return html.TextBoxFor(expression, htmlAttributes);
        }

    }

When you call the methods you can do,

@Html.TextBoxPlaceHolderFor(m => m.UserName)

//or 

@Html.TextBoxPlaceHolderFor(m => m.UserName, new { @class="form-field" })


You are done. Now get your form neat and clean using the TextBoxPlaceHolderFor().

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