/// <summary>
/// Creates a <span> tag with appropriate validation information used by client side AND server side code.<br/>
/// WFUtilities.FieldValidationErrorClass is applied if validation fails on a postback. This is used with an Html.<control>For() element.<br/>
/// The property whose validation state is checked is derived from a strongly-typed lambda.
/// </summary>
/// <param name="ErrorMessage">(Optional) Override any ErrorMessage provided by resources/xml/validators with this property.</param>
/// <param name="expression">An expression that identifies the property whose value will be rendered.<br/>
/// ie: m => m.FirstName will render the 'FirstName' property.</param>
/// <param name="htmlProperties">An anonymous object whose properties are applied to the element.<br/>
/// ie: new { Class = "cssClass", onchange = "jsFunction()" } </param>
/// <returns></returns>
public string ValidationMessageFor <TProperty>(Expression <Func <TModel, TProperty> > expression, string ErrorMessage, object htmlProperties)
{
WFModelMetaProperty metaprop = null;
ModelMetaData mmd = ModelMetaData.FromLambdaExpression(expression, _Model);
HtmlTag span = new HtmlTag("span", new { id = mmd.PropertyName + "_validationMessage", name = mmd.PropertyName + "_validationMessage" });
string lcName = mmd.PropertyName.ToLower();
for (int i = 0; i < _MetaData.Properties.Count; i++)
{
if (_MetaData.Properties[i].MarkupName.ToLower() == lcName)
{
metaprop = _MetaData.Properties[i];
break;
}
}
if (metaprop != null)
{
if (metaprop.HasError)
{
span.MergeObjectProperties(htmlProperties);
span.AddClass(WFUtilities.FieldValidationErrorClass);
if (String.IsNullOrEmpty(ErrorMessage))
{
span.InnerText = metaprop.Errors.FirstOrDefault() ?? "";
}
else
{
span.InnerText = ErrorMessage;
}
return(span.Render());
}
}
span.MergeObjectProperties(htmlProperties);
span.AddClass(WFUtilities.FieldValidationValidClass);
span = PreProcess(span, _MetaData, TagTypes.ValidationMessage,
metaprop != null ? metaprop.MarkupName : mmd.PropertyName,
metaprop != null ? metaprop.PropertyName : mmd.PropertyName,
_Model);
return(span.Render());
}
/// <summary>
/// Returns the raw text of any generated server-side validation error for this property.<br/>
/// This is useful if you want to override the default functionality that generates a <span> tag for validation error messages.
/// </summary>
/// <param name="expression">An expression that identifies the property whose value will be rendered.<br/>
/// ie: m => m.FirstName will render the 'FirstName' property.</param>
/// <returns></returns>
public string TextValidationMessageFor <TProperty>(Expression <Func <TModel, TProperty> > expression)
{
WFModelMetaProperty metaprop = null;
ModelMetaData mmd = ModelMetaData.FromLambdaExpression(expression, _Model);
string lcName = mmd.PropertyName.ToLower();
for (int i = 0; i < _MetaData.Properties.Count; i++)
{
if (_MetaData.Properties[i].MarkupName.ToLower() == lcName)
{
metaprop = _MetaData.Properties[i];
break;
}
}
if (metaprop != null)
{
if (metaprop.HasError)
{
return(metaprop.Errors.FirstOrDefault() ?? "");
}
}
return("");
}
private static HtmlTag GetTagFromExpression <TProperty>(TagTypes tagType,
Expression <Func <TModel, TProperty> > expression,
TModel model,
WFModelMetaData metadata,
object htmlProperties,
HtmlHelper <TModel> htmlHelper,
IEnumerable <SelectListItem> selectList,
string optionLabel, bool useLabel, bool isChecked)
{
ModelMetaData mmd = ModelMetaData.FromLambdaExpression(expression, model);
string reflectName = mmd.PropertyName;
string markupName = mmd.PropertyName;
HtmlTag tag = null;
if (tagType == TagTypes.InputBox)
{
tag = new HtmlTag("input", true);
tag.Attr("name", mmd.PropertyName);
tag.Attr("id", mmd.PropertyName);
tag.Attr("type", "text");
tag.Attr("value", GetHTMLValue(mmd.ModelAccessor()));
}
else if (tagType == TagTypes.Checkbox)
{
tag = new HtmlTag("input", true);
tag.Attr("name", mmd.PropertyName);
tag.Attr("id", mmd.PropertyName);
tag.Attr("type", "checkbox");
if (GetHTMLValueAsBoolean(mmd.ModelAccessor()))
{
tag.Attr("checked", "checked");
}
}
else if (tagType == TagTypes.Hidden)
{
tag = new HtmlTag("input", true);
tag.Attr("type", "hidden");
tag.Attr("value", GetHTMLValue(mmd.ModelAccessor()));
tag.Attr("name", mmd.PropertyName);
tag.Attr("id", mmd.PropertyName);
}
else if (tagType == TagTypes.Label)
{
tag = new HtmlTag("label");
tag.Attr("For", mmd.PropertyName);
PropertyInfo pi = (PropertyInfo)((MemberExpression)expression.Body).Member;
DisplayNameAttribute datt = pi.GetCustomAttributes(false).OfType <DisplayNameAttribute>().FirstOrDefault();
string dispName = "";
if (datt != null)
{
dispName = datt.DisplayName ?? pi.Name;
}
else
{
dispName = pi.Name;
}
tag.InnerText = dispName;
}
else if (tagType == TagTypes.RadioButton)
{
tag = new HtmlTag("input", true);
tag.Attr("name", mmd.PropertyName);
tag.Attr("id", mmd.PropertyName);
tag.Attr("type", "radio");
tag.Attr("value", GetHTMLValue(mmd.ModelAccessor()));
if (isChecked)
{
tag.Attr("checked", "checked");
}
}
else if (tagType == TagTypes.Select)
{
tag = new HtmlTag("select");
tag.Attr("id", mmd.PropertyName);
tag.Attr("name", mmd.PropertyName);
if (useLabel)
{
HtmlTag optx = new HtmlTag("option", new { value = "" })
{
InnerText = optionLabel ?? ""
};
tag.Children.Add(optx);
}
if (selectList != null)
{
foreach (SelectListItem si in selectList)
{
HtmlTag opt = new HtmlTag("option", new { value = si.Value ?? "" })
{
InnerText = si.Text ?? ""
};
if (si.Selected)
{
opt.Attr("selected", "selected");
}
tag.Children.Add(opt);
}
}
}
else if (tagType == TagTypes.TextArea)
{
tag = new HtmlTag("textarea");
tag.Attr("cols", "20");
tag.Attr("rows", "2");
tag.Attr("name", mmd.PropertyName);
tag.Attr("id", mmd.PropertyName);
tag.InnerText = GetHTMLValue(mmd.ModelAccessor());
}
else if (tagType == TagTypes.Span)
{
tag = new HtmlTag("span");
tag.Attr("id", mmd.PropertyName);
tag.InnerText = GetHTMLValue(mmd.ModelAccessor());
}
//WFUtilities.CheckPropertyError(metadata, model, tag, mmd.PropertyName, mmd.PropertyName);
tag.MergeObjectProperties(htmlProperties);
if (((MemberExpression)expression.Body).Member is PropertyInfo)
{
tag = htmlHelper.PreProcess(tag, metadata, tagType, mmd.PropertyName, (PropertyInfo)((MemberExpression)expression.Body).Member, model);
}
else
{
throw new Exception("Invalid argument specified in lambda for Html.xFor() method [" + markupName + "] (must be a property). Check your markup.");
}
return(tag);
}
/// <summary>
/// Returns the raw ID of any generated server-side validation error for this property.<br/>
/// This is useful if you want to override the default functionality that generates a <span> tag for validation error messages.
/// </summary>
/// <param name="expression">An expression that identifies the property whose value will be rendered.<br/>
/// ie: m => m.FirstName will render the 'FirstName' property.</param>
/// <returns></returns>
public string TextValidationMessageIDFor <TProperty>(Expression <Func <TModel, TProperty> > expression)
{
ModelMetaData mmd = ModelMetaData.FromLambdaExpression(expression, _Model);
return(mmd.PropertyName + "_validationMessage");
}
