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Subject:
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Searching for body element in an html not working
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Posted By:
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aldwinenriquez
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Post Date:
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8/26/2008 12:40:17 AM
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It seems that SelectSingle node does not work well with HTML documents loaded as XML.
XmlDocument doc = new XmlDocument();
doc.Load(@"c:\temp\layout.html");//load html as xml doc
//add namespace manager
XmlNamespaceManager man = new XmlNamespaceManager(doc.NameTable);
man.AddNamespace(string.Empty, "www.w3.org/1999/xhtml" target="_blank">http://wwww.w3.org/1999/xhtml");
XmlNode body = doc.DocumentElement.SelectSingleNode("//body",man);//also tried without namespace manager, but didn't work too.
if(body != null)
Console.WriteLine(body.OuterXml);
However when I do doc.DocumentElement["body"], it gives me the node.
What am I missing here?
Below is the HTML document:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>Untitled Page</title>
<link href="workflow.css" rel="stylesheet" type="text/css" />
</head>
<body>
<div style="height: 100%; width: 100%; overflow: auto; text-align: center; padding-left: 20px;">
<br />
<table class="workflow_container">
<tr>
<td>
<div id="dvDevelop" class="workflow_active">
</div>
</td>
</tr>
<tr>
<td>
<div class="down_arrow">
</div>
</td>
</tr>
<tr>
<td>
<div id="dvReview" class="workflow_disable">
</div>
</td>
</tr>
</table>
<div class="right_arrow">
</div>
<div id="dvContentQC" class="workflow_next">
</div>
<div class="right_arrow">
</div>
<div id="dvPublish" class="workflow_disable">
</div>
</div>
<p>
</p>
<p>
</p>
<p>
</p>
<p>
</p>
<div class="workflow_disable">
Approve
<table>
<tr>
<td>
3<br />
APP-00-102-11
<br />
Apr 12, 2007
</td>
</tr>
</table>
</div>
</body>
</html>
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Reply By:
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samjudson
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Reply Date:
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8/26/2008 2:05:56 AM
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1) I assume that the error above is in the url checking code on the forum, but the xhtml namespace is http://www.w3.org/1999/xhtml.
2) Have you tried adding the namespace with a prefix (such as xhtml) and then using "//xhtml:body" ?
/- Sam Judson : Wrox Technical Editor -/
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Reply By:
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aldwinenriquez
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Reply Date:
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8/26/2008 6:48:50 PM
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XmlNode body = doc.DocumentElement.SelectSingleNode("//body",man);
This always returns null.
"//xhtml:body" does not work either.
"Dont you ever give up!"
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Reply By:
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joefawcett
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Reply Date:
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8/27/2008 1:57:01 AM
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Show the relevant code where you read the document and set up the NamespaceManager.
--
Joe (Microsoft MVP - XML)
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Reply By:
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aldwinenriquez
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Reply Date:
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8/27/2008 6:38:55 PM
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XmlDocument doc = new XmlDocument();
doc.Load(@"c:\temp\layout.html");//load html as xml doc
//add namespace manager
XmlNamespaceManager man = new XmlNamespaceManager(doc.NameTable);
man.AddNamespace(string.Empty, www.w3.org/1999/xhtml" target="_blank">http://wwww.w3.org/1999/xhtml");
XmlNode body = doc.DocumentElement.SelectSingleNode("//body",man);//this is where I am searching for the node
if(body != null)
Console.WriteLine(body.OuterXml);
HTML document is available in the first post as inline text..
"Dont you ever give up!"
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Reply By:
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joefawcett
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Reply Date:
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8/28/2008 2:29:19 AM
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Well you don't assign a prefix, string.Empty cannot be used. You need to use something like "xhtml" and use "//xhtml:body" as your XPath.
If that doesn't work then your HTML is not XHTML.
--
Joe (Microsoft MVP - XML)
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Reply By:
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samjudson
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Reply Date:
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8/28/2008 3:26:27 AM
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Joe, according to the docs String.Empty can be used to define the default namespace. Should this not work then?
http://msdn.microsoft.com/en-us/library/system.xml.xmlnamespacemanager.addnamespace.aspx
/- Sam Judson : Wrox Technical Editor -/
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Reply By:
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mhkay
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Reply Date:
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8/28/2008 3:46:12 AM
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In XPath 1.0 "//body" means "find body elements in no namespace", not "find body elements in the default namespace". So setting the default namespace should make no difference.
Michael Kay
http://www.saxonica.com/
Author, XSLT 2.0 and XPath 2.0 Programmer's Reference
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Reply By:
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joefawcett
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Reply Date:
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8/28/2008 5:56:20 AM
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quote:
Originally posted by samjudson
Joe, according to the docs String.Empty can be used to define the default namespace. Should this not work then?
http://msdn.microsoft.com/en-us/library/system.xml.xmlnamespacemanager.addnamespace.aspx
/- Sam Judson : Wrox Technical Editor -/
It can be used to define the default namespace but that doesn't help you use it in XPath so I'm not sure what use that is.
--
Joe (Microsoft MVP - XML)
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