The typed html helpers that were introduced in ASP.NET MVC 2 are great. If you not using them, you should be. Basically, you pass them an expression tree pointing at a property in your model and it renders the proper html – complete with a nested-delimited id and name attribute. For example, the follow:
<%= Html.TextBoxFor(m => m.Filters.Occurred.From) %>
Renders:
<input type="text" value="" name="Filters.Occurred.From" id="Filters_Occurred_From">
I recently ran into an issue where I needed to output the id that would be generated by using a typed helper. In the HtmlHelper class, I found a GenerateIdFromName method – but I still needed the generated name for that to work. After digging around in the MVC code for a while (open source is awesome), I found the magic and wrapped it all up into two simple yet helpful extension methods for my HtmlHelper:
public static class HtmlExtensions
{
public static string NameFor<TModel, TProperty>(this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TProperty>> expression)
{
return htmlHelper.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldName( ExpressionHelper.GetExpressionText(expression));
}
public static string IdFor<TModel, TProperty>(this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TProperty>> expression)
{
return HtmlHelper.GenerateIdFromName(NameFor(htmlHelper, expression));
}
}
So from our previous example, this view code:
<%= Html.NameFor(m => m.Filters.Occurred.From) %> <%= Html.IdFor(m => m.Filters.Occurred.From) %>
Renders:
Filters.Occurred.From Filters_Occurred_From
You might ask: why would you need to do that? In my case I was dynamically creating a lot of html that needed to be wired up to specific JavaScript objects.
Enjoy.
Thank you very much for your sharing. This article give me a lot of idea to deal with custom Html helper. And if it convenient for you. May I show you some my custom Html helper for your recommendation via email.
No sooner, I will publish MVC blog but in Thai language. 🙂
thanks its what I need exactly
Thank You Very Much!!! It was so helpful…
Thanks for this info. It saved me lots of time.
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Why does this have to be the ONLY relabile source? Oh well, gj!
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