public ValidationError[] ValidateHtml(HtmlDocument document)
{
var records = new List<ValidationError>();
var nodes = document.SelectNodes("//h1");
if (nodes.Count == 0)
{
records.Add(new ValidationError("There must be at least one H1 tag on the page"));
}
return records.ToArray();
}
public ValidationError[] ValidateHtml(HtmlDocument document)
{
var records = new List<ValidationError>();
string formElementXPath = "//input[@type='image'][not(@alt) or @alt='']";
var imageButtonsWithoutAlt = document.SelectNodes(formElementXPath);
foreach (var imageButton in imageButtonsWithoutAlt)
{
string message = string.Format("Image input missing alt text: {0}", imageButton.OuterHtml);
records.Add(new ValidationError(message, imageButton.Line, imageButton.LinePosition));
}
return records.ToArray();
}
public 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.SelectNodes(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.SelectSingleNode(xpath);
}
if (correspondingLabel == null)
{
var message = string.Format("{0} missing correpsonding label: {1}", definition.Description, element.OuterHtml);
records.Add(new ValidationError(message));
}
}
}
return records.ToArray();
}
public ValidationError[] ValidateHtml(HtmlDocument document)
{
var records = new List<ValidationError>();
var existingLinks = new List<Link>();
const string formElementXPath = "//a";
var linksNodeList = document.SelectNodes(formElementXPath);
if (linksNodeList != null)
foreach (var currentNode in linksNodeList)
{
var urlAttribute = currentNode.Attributes["href"];
var titleAttribute = currentNode.Attributes["title"];
var nameAttribute = currentNode.Attributes["name"];
var linkText = currentNode.InnerText;
var url = urlAttribute == null ? string.Empty : urlAttribute.Value;
var title = titleAttribute == null ? string.Empty : titleAttribute.Value;
var name = nameAttribute == null ? string.Empty : nameAttribute.Value;
var link = new Link(url, linkText, title, name);
var matches = from c in existingLinks
where c.Url != link.Url && c.Text == link.Text && c.Title == link.Title && c.Name == link.Name
select c;
if (matches.Count() == 0)
existingLinks.Add(link);
else
{
records.Add(
new ValidationError(
string.Format(
"Link text does not make sense out of context,link is the same as another link on the page, but links to a different location: {0}",
currentNode.OuterHtml)));
}
}
return records.ToArray();
}
public ValidationError[] ValidateHtml(HtmlDocument document)
{
var records = new List<ValidationError>();
var labels = document.SelectNodes("//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.SelectSingleNode(xpath);
if (relatedElement == null)
{
xpath = string.Format("//select[@id='{0}']", labelId);
relatedElement = document.SelectSingleNode(xpath);
}
if (relatedElement == null)
{
xpath = string.Format("//textarea[@id='{0}']", labelId);
relatedElement = document.SelectSingleNode(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.ToArray();
}
public ValidationError[] ValidateHtml(HtmlDocument document)
{
var records = new List<ValidationError>();
var nodes = document.SelectNodes("//table");
if (nodes != null)
foreach (var node in nodes)
{
var tableHeaders = node.SelectNodes("tr/th");
var tableHeadersWithThead = node.SelectNodes("thead/tr/th");
if (tableHeaders.Count < 1 && tableHeadersWithThead.Count < 1)
{
string message =
string.Format(
"Layout table detected - if the table is a data table, use TH for the column or row headers. Otherwise, use CSS for layout: {0}",
node.OuterHtml);
records.Add(new ValidationError(message));
}
}
return records.ToArray();
}
public ValidationError[] ValidateHtml(HtmlDocument document)
{
var records = new List<ValidationError>();
var previousAltText = new List<string>();
const string formElementXPath = "//img";
var images = document.SelectNodes(formElementXPath);
foreach (var currentImage in images)
{
var altTextAttribute = currentImage.Attributes["alt"];
if (altTextAttribute != null)
{
if (previousAltText.Contains(altTextAttribute.Value))
{
string message = string.Format("Image has duplicate alt text: {0}", currentImage.OuterHtml);
records.Add(new ValidationError(message));
}
previousAltText.Add(altTextAttribute.Value);
}
}
return records.ToArray();
}