How to Set RadioButtonFor() in ASp.net MVC 2 as Checked by default

Question

How can i Set RadioButtonFor() as Checked By Default

<%=Html.RadioButtonFor(m => m.Gender,\"Male\")%>

there is way out for (Html.Radio

Answer 1

I found another option so you can just use @Html.EditorFor() with templates:

Say I have this enum:

public enum EmailType { Pdf, Html }

I can put this code in Views/Shared/EditorTemplates/EmailType.cshtml

@model EmailType
@{
    var htmlOptions = Model == EmailType.Html ? new { @checked = "checked" } : null;
    var pdfOptions = Model == EmailType.Pdf ? new { @checked = "checked" } : null;
}

@Html.RadioButtonFor(x => x, EmailType.Html, htmlOptions) @EmailType.Html.ToString()
@Html.RadioButtonFor(x => x, EmailType.Pdf, pdfOptions) @EmailType.Pdf.ToString()

Now I can simply use this if I want to use it at any time:

@Html.EditorFor(x => x.EmailType)

It's much more universal this way, and easier to change I feel.

Answer 2

<%: Html.RadioButtonFor(m => m.Gender, "Male", new { @checked = true } )%>

or

@checked = checked

if you like

Answer 3

If you're using jquery, you can call this right before your radio buttons.

$('input:radio:first').attr('checked', true);

^ This will check the first radio box, but you can look at more jquery to cycle through to the one you want selected.

Answer 4

This Helper evaluates the expression and if equals to the value it checks the radio button, and has the same parameters than RadioButtonFor (for this reason the name is diferent):

public static MvcHtmlString CheckedRadioButtonFor<TModel, TProperty>(this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TProperty>> expression, object value)
{
    return CheckedRadioButtonFor(htmlHelper, expression, value, null);
}

public static MvcHtmlString CheckedRadioButtonFor<TModel, TProperty>(this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TProperty>> expression, object value, object htmlAttributes)
{
    var func = expression.Compile();
    var attributes = new RouteValueDictionary(htmlAttributes);
    if ((object)func(htmlHelper.ViewData.Model) == value) {
        attributes["checked"] = "checked";
    }
    return htmlHelper.RadioButtonFor(expression, value, attributes);
}

Usage:

<%= Html.CheckedRadioButtonFor(m => m.Gender, "Male", new { id = "gender-male" })%>

Result:

<!-- For Model.Gender = "Male" -->
<input checked="checked" id="gender-male" name="Gender" type="radio" value="Male">
<!-- For Model.Gender = "Female" -->
<input id="gender-male" name="Gender" type="radio" value="Male">

Answer 5

It's not too pretty, but if you have to implement only very few radio buttons for the entire site, something like this might also be an option:

<%=Html.RadioButtonFor(m => m.Gender,"Male",Model.Gender=="Male" ? new { @checked = "checked" } : null)%>

Answer 6

I assume you should have a group of radio buttons. something could be like

<%=Html.RadioButtonFor(m => m.Gender,"Male")%>
<%=Html.RadioButtonFor(m => m.Gender,"Female")%>
<%=Html.RadioButtonFor(m => m.Gender,"Unknown")%>

You may give the default value for m.Gender = "Unknown" (or something) from your controller.