Parent of htmlagilitypack text node is select instead of option?
html-agility-pack
Question
I'm looking for text nodes in a select-based dom structure using htmlagility.
<select>
<option>
one
</option>
<option>
two
</option>
</select>
Parents of those nodes seem to be the
<select>
as opposed to an
<option>
Why?
using System.IO;
using System.Linq;
using HtmlAgilityPack;
using Microsoft.VisualStudio.TestTools.UnitTesting;
namespace Foo.Test
{
[TestClass]
public class HtmlAgilityTest
{
[TestMethod]
public void TestTraverseTextNodesInSelect()
{
var html = "<select><option>one</option><option>two</option></select>";
var doc = new HtmlDocument();
doc.Load(new StringReader(html));
var elements = doc.DocumentNode.Descendants().Where(n=>n.Name == "#text");
Assert.AreEqual(2, elements.Count());
Assert.AreEqual("select", elements.ElementAt(0).ParentNode.Name);
Assert.AreEqual("select", elements.ElementAt(1).ParentNode.Name);
}
}
}
Accepted Answer
That is due to Drop closing HtmlAgilityPack<option>
tag automatically. HAP interprets your HTML as follows:
Console.WriteLine(doc.DocumentNode.OuterHtml);
//result :
//<select><option>one<option>two</select>
Additionally, as noted in the related query up above, you may change that behavior by calling the following line before to starting theHtmlDocument
:
HtmlNode.ElementsFlags.Remove("option");
Popular Answer
[TestMethod]
public void TestTraverseTextNodesInSelect()
{
HtmlNode.ElementsFlags.Remove("option");
var html = "<select><option>one</option><option>two</option></select>";
var doc = new HtmlDocument();
doc.Load(new StringReader(html));
var elements = doc.DocumentNode.Descendants().Where(n=>n.Name == "#text");
Assert.AreEqual(2, elements.Count());
Assert.AreEqual("select", elements.ElementAt(0).ParentNode.Name);
Assert.AreEqual("select", elements.ElementAt(1).ParentNode.Name);
}
You may give it a go.
It is like this at the library. You must take it out. The AgilityPack is configured by default to consider option tags as empty.
ElementsFlags.Add("option", HtmlElementFlag.Empty);
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