How to use Html Agility Pack for HTML validations
Question
I am using HTML Agility Pack for validating my html. Below is what I am using,
public class MarkupErrors
{
public string ErrorCode { get; set; }
public string ErrorReason { get; set; }
}
public static List<MarkupErrors> IsMarkupValid(string html)
{
var document = new HtmlAgilityPack.HtmlDocument();
document.OptionFixNestedTags = true;
document.LoadHtml(html);
var parserErrors = new List<MarkupErrors>();
foreach(var error in document.ParseErrors)
{
parserErrors.Add(new MarkupErrors
{
ErrorCode = error.Code.ToString(),
ErrorReason = error.Reason
});
}
return parserErrors;
}
So say my input is something like the one shown below :
<h1>Test</h1>
Hello World</h2>
<h3>Missing close h3 tag
So my current function return a list of following errors
- Start tag <h2> was not found
- End tag </h3> was not found
which is fine...
My problem is that I want the entire html to be valid, that is with a proper <head> and <body> tags, because this html will later be available for preview, download as .html files.
So I was wondering if I could check for this using HTML Agility Pack ?
Any ideas or other options will be appreciated. Thanks
1 answers
solution1
5 ACCPTED 2013-05-20 08:45:12
You can check there is a HEAD element or a BODY element under an HTML element like this for example:
bool hasHead = doc.DocumentNode.SelectSingleNode("html/head") != null;
bool hasBody = doc.DocumentNode.SelectSingleNode("html/body") != null;
These would fail if there is no HTML element, or if there is no BODY element under the HTML element.
Note I don't use this kind of XPATH expression "//head" because it would give a result even if the head was not directly under the HTML element.
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.