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Example HTML:
<html><body> <form id="form1"> <input name="foo1" value="bar1" /> <!-- Other elements --> </form> <form id="form2"> <input name="foo2" value="bar2" /> <!-- Other elements --> </form> </body></html> Test code:
HtmlDocument doc = new HtmlDocument(); doc.Load(@"D:\test.html"); foreach (HtmlNode node in doc.GetElementbyId("form2").SelectNodes(".//input")) { Console.WriteLine(node.Attributes["value"].Value); } The statement doc.GetElementbyId("form2").SelectNodes(".//input") gives me a null reference.
Anything I did wrong? thanks.
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You can do the following:
HtmlNode.ElementsFlags.Remove("form"); HtmlDocument doc = new HtmlDocument(); doc.Load(@"D:\test.html"); HtmlNode secondForm = doc.GetElementbyId("form2"); foreach (HtmlNode node in secondForm.Elements("input")) { HtmlAttribute valueAttribute = node.Attributes["value"]; if (valueAttribute != null) { Console.WriteLine(valueAttribute.Value); } } By default HTML Agility Pack parses forms as empty node because they are allowed to overlap other HTML elements. The first line, (HtmlNode.ElementsFlags.Remove("form");) disables this behavior allowing you to get the input elements inside the second form.
Update: Example of form elements overlap:
<table> <form> <!-- Other elements --> </table> </form> The element begins inside a table but is closed outside the table element. This is allowed in the HTML specification and HTML Agility Pack has to deal with it.
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