public IEnumerable<ValidationError> ValidateHtml(HtmlDocument document)
{
var records = new List<ValidationError>();
var labels = document.GetNodes("//label");
foreach (var label in labels)
{
var forAttribute = label.Attributes["for"];
HtmlNode relatedElement = null;
if (forAttribute != null)
{
string labelId = forAttribute.Value;
string xpath = string.Format("//input[@id='{0}']", labelId);
relatedElement = document.GetNode(xpath);
if (relatedElement == null)
{
xpath = string.Format("//select[@id='{0}']", labelId);
relatedElement = document.GetNode(xpath);
}
if (relatedElement == null)
{
xpath = string.Format("//textarea[@id='{0}']", labelId);
relatedElement = document.GetNode(xpath);
}
}
if (relatedElement == null)
{
string message = string.Format("Label does not relate to a form control: {0}", label.OuterHtml);
records.Add(new ValidationError(message));
}
}
return records;
}
public IEnumerable<ValidationError> ValidateHtml(HtmlDocument document)
{
var records = new List<ValidationError>();
var textDefinition = new {TagName = "text", Description = "Textbox", IsInput = true};
var passwordDefinition = new {TagName = "password", Description = "Password textbox", IsInput = true};
var checkboxDefinition = new {TagName = "checkbox", Description = "Checkbox", IsInput = true};
var selectDefinition = new { TagName = "select", Description = "Select list", IsInput = false };
var textAreaDefinition = new { TagName = "textarea", Description = "Text area", IsInput = false };
var definitions = new[] {textDefinition, passwordDefinition, checkboxDefinition, selectDefinition, textAreaDefinition};
foreach (var definition in definitions)
{
var formElementXPath = definition.IsInput ? string.Format("//input[@type='{0}']", definition.TagName) : string.Format("//{0}", definition.TagName);
var elements = document.GetNodes(formElementXPath);
foreach (var element in elements)
{
var idAttribute = element.Attributes["id"];
HtmlNode correspondingLabel = null;
if (idAttribute != null)
{
var elementId = idAttribute.Value;
var xpath = string.Format("//label[@for='{0}']", elementId);
correspondingLabel = document.GetNode(xpath);
}
if (correspondingLabel == null)
{
var message = string.Format("{0} missing corresponding label: {1}", definition.Description, element.OuterHtml);
records.Add(new ValidationError(message, element.Line, element.LinePosition));
}
}
}
return records;
}