CODEWITHSUNDEEP
asp.net-mvcmodel-view-controller
tayfunozturk3561
tayfunozturk3561

Reputation: 23

How to add default attribute value of "class" in custom htmlhelper?

I try to create a custom textbox in mvc. I want to add default class value "text-uppercase".I also want add new class values in view.

Myhelper class is;

public static MvcHtmlString Custom_TextBox<TModel, TValue>(this HtmlHelper<TModel> helper, Expression<Func<TModel, TValue>> expression, IDictionary<string, object> htmlAttributes)
    {

        ModelMetadata oModelMetadata = ModelMetadata.FromLambdaExpression(expression, helper.ViewData);
        if (htmlAttributes == null)
        {
            htmlAttributes = new Dictionary<string, object>();
        }
        htmlAttributes.Add("type", "text");
        htmlAttributes.Add("name", oModelMetadata.DisplayName);
        htmlAttributes.Add("id", oModelMetadata.DisplayName);
        htmlAttributes.Add("class", "text-uppercase");


        return helper.TextBoxFor(expression, htmlAttributes);
    }

And my view code:

   @Html.Custom_TextBox(model => model.YazilimAdi,new { @class = "form-control" } )

Actually the error is: An item with the same key has already been added. "class".

How can i add my default class value "text-uppercase"?

Upvotes: 0

Views: 309

Answers (1)

Gene R
Gene R

Reputation: 3744

if(htmlAttributes.ContainsKey("class"))
{
    htmlAttributes["class"] += " text-uppercase";
}
else
{
    htmlAttributes.Add("class", "text-uppercase");
}

and put this at the beginning of extension:

if (htmlAttributes == null)
{
    htmlAttributes = new Dictionary<string, object>();
}

Upvotes: 2

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