Inserting new node in html document in c#

Question

I am trying to insert new node in the document using htmlagilitypack. I am reading the document from the stream , insert the node and then return the document as a FileContentResult object :

HtmlDocument ndoc = new HtmlDocument();
ndoc.Load(stream);

HtmlNode usern = HtmlNode.CreateNode("<img .... />");
usern.Attributes.Add("onclick", "javascript:document.location.href='/Home/Index';");
ndoc.DocumentNode.SelectSingleNode("id('main')").AppendChild(usern);

using (MemoryStream ms = new MemoryStream())
{
   ndoc.Save(ms);
   ms.Seek(0, System.IO.SeekOrigin.Begin);
   fileBytes = ms.ToArray();
}

FileContentResult file = File(fileBytes, "text/html");
return file;

Problem : New node ( img ) is not inserting. My footer content gone if i am using this code and if i just read the document from the stream and return as a FileContentResult then everything perfect. I want to know whats the problem with this code or where i am doing wrong ?

score 0 · Answer 1 · edited May 23 '17 at 10:24

0

Take a look at HTML Agility pack create new HTMLNode.

This shows how to properly create a new node. In my experience, their code works fine. Similar to jQuery taking it step by step. Good luck!

edited May 23 '17 at 10:24

Community

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answered Jul 31 '12 at 05:36

jamesbar2

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Namely, you need to use the current node to create a new element. – jamesbar2 Jul 31 '12 at 05:37

COLD TOLD · Answer 2 · 2012-07-31T05:46:03.600

0

try to change

HtmlNode usern = HtmlNode.CreateNode("<img .... />");

to just img

HtmlNode usern = HtmlNode.CreateNode("<img></img>");

and add this

 ndoc.OptionWriteEmptyNodes = true;

edited Jul 31 '12 at 05:46

answered Jul 31 '12 at 05:39

COLD TOLD

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@King Kong try this ndoc.OptionOutputAsXml = true; – COLD TOLD Jul 31 '12 at 05:53
@King Kong are you using html agility pack to add footer – COLD TOLD Jul 31 '12 at 06:03
no i am using it to add img node , but after inserting the node when i save the document , the footer contents not save or somehow it disappeared. I mentioned this in my question also – King Kong Jul 31 '12 at 06:06
@King Kong try to read the footer content first and the append it after your image – COLD TOLD Jul 31 '12 at 06:07
let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/14665/discussion-between-cold-told-and-king-kong) – COLD TOLD Jul 31 '12 at 06:14
@King Kong it might be the way you append the text after the image gets lost – COLD TOLD Jul 31 '12 at 06:14

score 0 · Answer 3 · answered Mar 15 '13 at 11:34

I came across the same issue, resolved it by passing the clone object. just modify the line

ndoc.DocumentNode.SelectSingleNode("id('main')").AppendChild(usern);

to

ndoc.DocumentNode.SelectSingleNode("id('main')").AppendChild(usern.CloneNode(true));

Inserting new node in html document in c#

3 Answers3