public static ScopedHtmlHelper <T> VisibleWhenChecked <T>(this HtmlHelper <T> helper, Expression <Func <T, bool> > property, bool visible, Action <HtmlTag> mutator = null)
{
var propertyName = property.GetExpressionText();
var name = helper.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldName(propertyName);
var modelChecked = helper.ViewData.ModelState.ContainsKey(name);
if (!modelChecked)
{
var modelValue = ModelMetadata.FromLambdaExpression(property, helper.ViewData).Model;
modelChecked = modelValue != null && (bool)modelValue;
}
var container = new DivTag().NoClosingTag();
if (visible && !modelChecked || !visible && modelChecked)
{
container.AddClasses("show-hide-hidden");
}
if (visible)
{
container.Attr("data-checkbox-checked-show", name);
}
else
{
container.Attr("data-checkbox-checked-hide", name);
}
if (mutator != null)
{
mutator(container);
}
helper.ViewContext.Writer.Write(container.ToHtmlString());
return(new ScopedHtmlHelper <T>(helper, () =>
{
helper.ViewContext.Writer.Write($"</{container.TagName()}>");
}));
}
public static ScopedHtmlHelper <T> VisibleWhenValue <T>(this HtmlHelper <T> helper, Expression <Func <T, bool?> > property, string value, Action <HtmlTag> mutator = null)
{
var propertyName = property.GetExpressionText();
var name = helper.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldName(propertyName);
string modelValue = null;
var modelState = helper.ViewData.ModelState;
if (modelState.ContainsKey(name))
{
modelValue = (modelState[name].Value?.AttemptedValue ?? "").ToString();
}
else
{
modelValue = (ModelMetadata.FromLambdaExpression(property, helper.ViewData).Model ?? "").ToString();
}
var container = new DivTag().NoClosingTag();
if (modelValue != value)
{
container.AddClasses("show-hide-hidden");
}
container.Attr("data-radio-show-name", name);
container.Attr("data-radio-show-value", value);
if (mutator != null)
{
mutator(container);
}
helper.ViewContext.Writer.Write(container.ToHtmlString());
return(new ScopedHtmlHelper <T>(helper, () =>
{
helper.ViewContext.Writer.Write($"</{container.TagName()}>");
}));
}