public static MvcHtmlString RadioButton(this HtmlHelper htmlHelper, string name, object value, IDictionary <string, object> htmlAttributes)
{
// Determine whether or not to render the checked attribute based on the contents of ViewData.
string valueString = Convert.ToString(value, CultureInfo.CurrentCulture);
bool isChecked = (!String.IsNullOrEmpty(name)) && (String.Equals(htmlHelper.EvalString(name), valueString, StringComparison.OrdinalIgnoreCase));
// checked attributes is implicit, so we need to ensure that the dictionary takes precedence.
RouteValueDictionary attributes = ToRouteValueDictionary(htmlAttributes);
if (attributes.ContainsKey("checked"))
{
return(InputHelper(htmlHelper,
InputType.Radio,
metadata: null,
name: name,
value: value,
useViewData: false,
isChecked: false,
setId: true,
isExplicitValue: true,
format: null,
htmlAttributes: attributes));
}
return(RadioButton(htmlHelper, name, value, isChecked, htmlAttributes));
}
// Helper methods
#region Common Helpers
private static MvcHtmlString InputHelper(HtmlHelper htmlHelper, InputType inputType, ModelMetadata metadata, string name, object value, bool useViewData, bool isChecked, bool setId, bool isExplicitValue, string format, IDictionary <string, object> htmlAttributes)
{
//string fullName = htmlHelper.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldName(name);
string fullName = name;
if (String.IsNullOrEmpty(fullName))
{
throw new ArgumentException(MvcResources.Common_NullOrEmpty, "name");
}
TagBuilder tagBuilder = new TagBuilder("input");
tagBuilder.MergeAttributes(htmlAttributes);
tagBuilder.MergeAttribute("type", HtmlHelper.GetInputTypeString(inputType));
tagBuilder.MergeAttribute("name", fullName, true);
string valueParameter = htmlHelper.FormatValue(value, format);
bool usedModelState = false;
switch (inputType)
{
case InputType.CheckBox:
bool?modelStateWasChecked = htmlHelper.GetModelStateValue(fullName, typeof(bool)) as bool?;
if (modelStateWasChecked.HasValue)
{
isChecked = modelStateWasChecked.Value;
usedModelState = true;
}
goto case InputType.Radio;
case InputType.Radio:
if (!usedModelState)
{
string modelStateValue = htmlHelper.GetModelStateValue(fullName, typeof(string)) as string;
if (modelStateValue != null)
{
isChecked = String.Equals(modelStateValue, valueParameter, StringComparison.Ordinal);
usedModelState = true;
}
}
if (!usedModelState && useViewData)
{
isChecked = htmlHelper.EvalBoolean(fullName);
}
if (isChecked)
{
tagBuilder.MergeAttribute("checked", "checked");
}
tagBuilder.MergeAttribute("value", valueParameter, isExplicitValue);
break;
case InputType.Password:
if (value != null)
{
tagBuilder.MergeAttribute("value", valueParameter, isExplicitValue);
}
break;
default:
string attemptedValue = (string)htmlHelper.GetModelStateValue(fullName, typeof(string));
tagBuilder.MergeAttribute("value", attemptedValue ?? ((useViewData) ? htmlHelper.EvalString(fullName, format) : valueParameter), isExplicitValue);
break;
}
if (setId)
{
tagBuilder.GenerateId(fullName);
}
// If there are any errors for a named field, we add the css attribute.
if (htmlHelper.HasFieldError(fullName))
{
tagBuilder.AddCssClass(HtmlHelper.ValidationInputCssClassName);
}
tagBuilder.MergeAttributes(htmlHelper.GetUnobtrusiveValidationAttributes(name, metadata));
//causes 'true,false' to be posted which is an invalid value for booleans
if (false && inputType == InputType.CheckBox)
{
// Render an additional <input type="hidden".../> for checkboxes. This
// addresses scenarios where unchecked checkboxes are not sent in the request.
// Sending a hidden input makes it possible to know that the checkbox was present
// on the page when the request was submitted.
StringBuilder inputItemBuilder = new StringBuilder();
inputItemBuilder.Append(tagBuilder.ToString(TagRenderMode.SelfClosing));
TagBuilder hiddenInput = new TagBuilder("input");
hiddenInput.MergeAttribute("type", HtmlHelper.GetInputTypeString(InputType.Hidden));
hiddenInput.MergeAttribute("name", fullName);
hiddenInput.MergeAttribute("value", "false");
inputItemBuilder.Append(hiddenInput.ToString(TagRenderMode.SelfClosing));
return(MvcHtmlString.Create(inputItemBuilder.ToString()));
}
return(tagBuilder.ToHtmlString(TagRenderMode.SelfClosing));
}
// Helper methods
#region Common Helpers
private static MvcHtmlString InputHelper(HtmlHelper htmlHelper, InputType inputType, ModelMetadata metadata, string name, object value, bool useViewData, bool isChecked, bool setId, bool isExplicitValue, string format, IDictionary <string, object> htmlAttributes)
{
//string fullName = htmlHelper.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldName(name);
string fullName = name;
if (String.IsNullOrEmpty(fullName))
{
throw new ArgumentException(MvcResources.Common_NullOrEmpty, "name");
}
TagBuilder tagBuilder = new TagBuilder("input");
tagBuilder.MergeAttributes(htmlAttributes);
tagBuilder.MergeAttribute("type", HtmlHelper.GetInputTypeString(inputType));
tagBuilder.MergeAttribute("name", fullName, true);
string valueParameter = htmlHelper.FormatValue(value, format);
bool usedModelState = false;
switch (inputType)
{
case InputType.CheckBox:
bool?modelStateWasChecked = htmlHelper.GetModelStateValue(fullName, typeof(bool)) as bool?;
if (modelStateWasChecked.HasValue)
{
isChecked = modelStateWasChecked.Value;
usedModelState = true;
}
goto case InputType.Radio;
case InputType.Radio:
if (!usedModelState)
{
string modelStateValue = htmlHelper.GetModelStateValue(fullName, typeof(string)) as string;
if (modelStateValue != null)
{
isChecked = String.Equals(modelStateValue, valueParameter, StringComparison.Ordinal);
usedModelState = true;
}
}
if (!usedModelState && useViewData)
{
isChecked = htmlHelper.EvalBoolean(fullName);
}
if (isChecked)
{
tagBuilder.MergeAttribute("checked", "checked");
}
tagBuilder.MergeAttribute("value", valueParameter, isExplicitValue);
break;
case InputType.Password:
if (value != null)
{
tagBuilder.MergeAttribute("value", valueParameter, isExplicitValue);
}
break;
default:
string attemptedValue = (string)htmlHelper.GetModelStateValue(fullName, typeof(string));
tagBuilder.MergeAttribute("value", attemptedValue ?? ((useViewData) ? htmlHelper.EvalString(fullName, format) : valueParameter), isExplicitValue);
break;
}
if (setId)
{
tagBuilder.GenerateId(fullName);
}
// If there are any errors for a named field, we add the css attribute.
if (htmlHelper.HasFieldError(fullName))
{
tagBuilder.AddCssClass(HtmlHelper.ValidationInputCssClassName);
}
tagBuilder.MergeAttributes(htmlHelper.GetUnobtrusiveValidationAttributes(name, metadata));
return(tagBuilder.ToHtmlString(TagRenderMode.SelfClosing));
}
// Helper methods
private static MvcHtmlString InputHelper(HtmlHelper htmlHelper, InputType inputType, ModelMetadata metadata, string name, object value, bool useViewData, bool isChecked, bool setId, bool isExplicitValue, IDictionary <string, object> htmlAttributes)
{
var fullName = name;
if (String.IsNullOrEmpty(name))
{
throw new ArgumentException(MvcResources.Common_NullOrEmpty, "name");
}
var tagBuilder = new TagBuilder("input");
tagBuilder.MergeAttributes(htmlAttributes);
tagBuilder.MergeAttribute("type", HtmlHelper.GetInputTypeString(inputType));
tagBuilder.MergeAttribute("name", fullName, true);
string valueParameter = Convert.ToString(value, CultureInfo.CurrentCulture);
bool usedModelState = false;
switch (inputType)
{
case InputType.CheckBox:
var modelStateWasChecked = htmlHelper.GetModelStateValue(fullName, typeof(bool)) as bool?;
if (modelStateWasChecked.HasValue)
{
isChecked = modelStateWasChecked.Value;
usedModelState = true;
}
goto case InputType.Radio;
case InputType.Radio:
if (!usedModelState)
{
var modelStateValue = htmlHelper.GetModelStateValue(fullName, typeof(string)) as string;
if (modelStateValue != null)
{
isChecked = String.Equals(modelStateValue, valueParameter, StringComparison.Ordinal);
usedModelState = true;
}
}
if (!usedModelState && useViewData)
{
isChecked = htmlHelper.EvalBoolean(fullName);
}
if (isChecked)
{
tagBuilder.MergeAttribute("checked", "checked");
}
tagBuilder.MergeAttribute("value", valueParameter, isExplicitValue);
break;
case InputType.Password:
if (value != null)
{
tagBuilder.MergeAttribute("value", valueParameter, isExplicitValue);
}
break;
default:
var attemptedValue = (string)htmlHelper.GetModelStateValue(fullName, typeof(string));
tagBuilder.MergeAttribute("value", attemptedValue ?? ((useViewData) ? htmlHelper.EvalString(fullName) : valueParameter), isExplicitValue);
break;
}
if (setId)
{
tagBuilder.GenerateId(fullName);
}
return(tagBuilder.ToMvcHtmlString(TagRenderMode.SelfClosing));
}