Geek Answers Handbook

LabelFor and TextBoxFor do not generate the same identifiers

When using the following code, the field identifier and identifier in the attribute for the label label are not identical.

<%: Html.LabelFor(x => x.Localizations["en"]) %>   => Localizations[en]
<%: Html.TextBoxFor(x=> x.Localizations["en"]) %>  => Localizations_en_

<%: Html.LabelFor(x => x.Localizations["en"].Property) %>
       => Localizations[en]_Property
<%: Html.TextBoxFor(x=> x.Localizations["en"].Property) %>
       => Localizations_en__Property

I followed the code in the reflector and saw that the way the values ​​were generated is different. Do not use the same helper method.

LabelFor uses HtmlHelper.GenerateIdFromName, and TextBoxFor uses TagBuilder#GenerateId.

Does anyone know the reason for this or a workaround (other than writing all your own set of input helpers / textarea / select)? Or is this a mistake?

UPDATE:

Since I still use the html helper for the label with the second parameter for the label text, I modified it to use the same code generation code as the form field helpers.

public static MvcHtmlString LabelFor<TModel, TValue>(this HtmlHelper<TModel> helper, Expression<Func<TModel, TValue>> expression, string labelText)
{
    // The main part of this code is taken from the internal code for Html.LabelFor<TModel, TValue>(...).
    var metaData = ModelMetadata.FromLambdaExpression(expression, helper.ViewData);
    var fieldName = ExpressionHelper.GetExpressionText(expression);

    TagBuilder builder = new TagBuilder("label");
    // Generate the id as for the form fields (adds it to self).
    builder.GenerateId(fieldName);
    // Use the generated id for the 'for' attribute.
    builder.Attributes.Add("for", builder.Attributes["id"]);
    // Remove the id again.
    builder.Attributes.Remove("id");
    builder.SetInnerText(labelText);
    return MvcHtmlString.Create(builder.ToString());
}

, , , MVC2. .

: id/ HTML5, , , id ^~[]. . Mathias Bynens.

2:

, DefaultModelBinder . , -, MVC 2, :

<input type="text" name="Dict[en]" value="(VALUE)">

, :

<input type="hidden" name="Dict[0].Key" value="en">
<input type="text" name="Dict[0].Value" value="(VALUE)">

, .

, MVC2 , :

ModelBinders.Binders.Add(typeof(IDictionary<string,object>), new DictionaryModelBinder());
ModelBinders.Binders.Add(typeof(IDictionary<string,string>), new DictionaryModelBinder());
ModelBinders.Binders.Add(typeof(IDictionary), new DictionaryModelBinder());
ModelBinders.Binders.Add(typeof(Dictionary), new DictionaryModelBinder());

, .Key.

+5
2

MVC3, (RTM MVC 3). LabelFor tagbuilder, "", , , .

html 4.01 , , -. , , .

+3

MVC mungs id , jQuery/CSS3. , , "" ( jQuery/CSS3).

name, .

, , , LabelFor TextBoxFor. , LabelFor, TextBoxFor.

+1

More articles:


All Articles