embed xml

[murali.trichy]

Hi,

I'm new to dotnet xml.

I want to embed my part of xml to existing xml data using xmldocument.
I think there is an option but i'm not getting exactly.

eg: DocumentElement.InsertAfter is used to insert the node but
reference is
problem ie how can i give ?

sample :

<span>
<div align="center">
< input id="myTxt" type="text"
style="background-color:LightSteelBlue;width:90%" autosuggest="true" />
<input type="button" value="myButton" onclick="myFunction();" />
</div>
</span>

from the above sample xml I want to insert a table tag before and after

input type=text tag.

Is possible ?
if yes pls suggest.

Thanks in advance.

[Cerebrus]

Hi Murali,

You can get the reference to the required "input" tag using a XPath
query. After that, just use the InsertBefore and InsertAfter functions
to insert away... !

The XPath to use here could be of the format :
".//span/div/input[@type='text']"
Try this :

==============================

Dim xDoc As New XmlDocument()
xDoc.Load("MyFile.xml")
Dim xList As XmlNode =
xDoc.SelectSingleNode(".//span/div/input[@type='text']")
Dim xNode, xParent As XmlNode
Dim xFrag As XmlDocumentFragment = xDoc.CreateDocumentFragment()
Dim xFrag2 As XmlDocumentFragment = xDoc.CreateDocumentFragment()
xFrag.InnerXml = "<TABLE id=""Table1"" cellspacing=""1""
cellpadding=""1"" width=""100%"" border=""0"" />"
xFrag2.InnerXml = "<TABLE id=""Table2"" cellspacing=""1""
cellpadding=""1"" width=""100%"" border=""0"" />"
xParent = xNode.ParentNode
xParent.InsertBefore(xFrag, xNode)
xParent.InsertAfter(xFrag2, xNode)
xDoc.Save("MyFile.xml"")

==============================

You did not give a lengthier part of your XML file, so I thought it
would be easier to explain using an XmlNode. The XPath expression
should match multiple "input" nodes, one for every "Span/div". In that
case, you can use the SelectNodes("") method to get an XmlNodeList and
iterate through that List.

HTH,

Regards,

Cerebrus.

[dickster]

Perhaps use this as an alternative solution :
================================================== =============

Dim xdoc As New XmlDocument
xdoc.LoadXml("<span><div align='center'><input id='myTxt'
type='text' style='background-color:LightSteelBlue;width:90%'
autosuggest='true'/><input type='button' value='myButton'
onclick='myFunction();' /> </div></span>")

Dim xmlOldEle As XmlElement =
xdoc.SelectSingleNode("//input[@type='text']")
Dim xmlNewEle As XmlElement = xdoc.CreateElement("table")
xmlNewEle.AppendChild(xmlOldEle)

xdoc.SelectSingleNode("//div").PrependChild(xmlNewEle)

================================================== =============
Cerebus,
Im not that hot on using XmlDocumentFragment, but would like to learn
more - any good resources on this?

[murali.trichy]

wow,
really thanks guys I'm also solved - I'm basically C# programmer.

main function which I used here is : ReplaceChild() and AppendChild()
and other part of coding which I need to do.

& once again thanks to Cerebrus & dickster.

XmlElement newcatalogentry =
xmldoc.CreateElement("TABLE");
XmlAttribute tblwidthattr =
xmldoc.CreateAttribute("width");
tblwidthattr.Value = "100%";

newcatalogentry.SetAttributeNode(tblwidthattr);
XmlAttribute tblcspaceattr =
xmldoc.CreateAttribute("cellspacing");
tblcspaceattr.Value = "0";

newcatalogentry.SetAttributeNode(tblcspaceattr);
XmlAttribute tblcpadattr =
xmldoc.CreateAttribute("cellpadding");
tblcpadattr.Value = "0";

newcatalogentry.SetAttributeNode(tblcpadattr);

XmlAttribute newcatalogattr =
xmldoc.CreateAttribute("ID");
newcatalogattr.Value = "custctltbl2_1";

newcatalogentry.SetAttributeNode(newcatalogattr);
XmlElement firstelement =
xmldoc.CreateElement("TR");
newcatalogentry.AppendChild(firstelement);
XmlAttribute trtxtwidthattr =
xmldoc.CreateAttribute("width");
trtxtwidthattr.Value = "100%";

firstelement.SetAttributeNode(trtxtwidthattr);
XmlElement tdxe =
xmldoc.CreateElement("TD");
XmlAttribute tdtxtwidthattr =
xmldoc.CreateAttribute("width");
tdtxtwidthattr.Value = "100%";
tdxe.SetAttributeNode(tdtxtwidthattr);
firstelement.AppendChild(tdxe);
XmlNode xnode = xnod.Clone();
tdxe.AppendChild(xnode);
XmlElement lstelmt =
xmldoc.CreateElement("SELECT");
XmlAttribute sltwidthattr =
xmldoc.CreateAttribute("style");
sltwidthattr.Value = "width:91%";
lstelmt.SetAttributeNode(sltwidthattr);

XmlAttribute selidattr =
xmldoc.CreateAttribute("ID");
selidattr.Value = "custsugg" + id;
lstelmt.SetAttributeNode(selidattr);
XmlAttribute selclsattr =
xmldoc.CreateAttribute("classname");
selclsattr.Value = "drp";
lstelmt.SetAttributeNode(selclsattr);
XmlAttribute selsizeattr =
xmldoc.CreateAttribute("size");
selsizeattr.Value = "4";
lstelmt.SetAttributeNode(selsizeattr);
XmlElement tdlstelmt =
xmldoc.CreateElement("TD");
XmlAttribute tdsltwidthattr =
xmldoc.CreateAttribute("width");
tdsltwidthattr.Value = "100%";
tdlstelmt.SetAttributeNode(tdsltwidthattr);
tdlstelmt.AppendChild(lstelmt);

XmlElement trlstelmt =
xmldoc.CreateElement("TR");
XmlAttribute tridattr =
xmldoc.CreateAttribute("ID");
tridattr.Value = "custsugg" + id;
trlstelmt.SetAttributeNode(tridattr);

XmlAttribute trsltwidthattr =
xmldoc.CreateAttribute("width");
trsltwidthattr.Value = "100%";
trlstelmt.SetAttributeNode(trsltwidthattr);
XmlAttribute trposatt =
xmldoc.CreateAttribute("style");
trposatt.Value =
"position:absolute;display:none;visibility:hidden" ;
trlstelmt.SetAttributeNode(trposatt);
trlstelmt.AppendChild(tdlstelmt);
newcatalogentry.AppendChild(trlstelmt);

divnod.ReplaceChild(newcatalogentry, xnod);

[Cerebrus]

Hi Murali,

I personally find it much more concise and efficient to simply load an
XML string (where it is not known beforehand), and then make inserts /
removals from the Main document, rather than adding elements and
attributes individually. It also uses far less variables and there is
less room for confusion. You might experiment with both methods.

Dickster,

Your solution will surely do the job, but it might be more complicated
to add attributes to the "table" element.

Im not that hot on using XmlDocumentFragment, but would like to learn
more - any good resources on this?

Well, using an XmlDocumentFragment is pretty simple. (Note: I'm talking
about VS 2003)
1. Instantiate it using the CreateDocumentFragment() method of the
XmlDocument
2. Set it's InnerXml property to the XML markup of the fragment you
want to insert / replace etc.
3. Use it wherever you can use an XmlNode, since it inherits from
XmlNode.

As for resources, I just use the MSDN help. You might search online for
some good tutorials.

HTH,

Regards,

Cerebrus.

[dickster]

Thanks Cerebus

XmlNode is abstract - XmlDocument, XmlElement & XmlDocumentFragment
all inherit from it. Which is fine

What I can not get my head round is that XmlElement objects have to
come from a XmlDocument Context..

Consider this code:
----------------------------------------------------------
Dim xdoc As New XmlDocument
xdoc.LoadXml("<table></table>")
Dim xmlEle As XmlElement = xdoc.CreateElement("tr")

But I cant then say:

xmlNewEle.AppendChild(<< A New XmlElement object which would be a 'td'

)

Any thoughts?

[murali.trichy]

> load an

XML string (where it is not known beforehand), and then make inserts /
removals from the Main document, rather than adding elements and
attributes individually

Hi Cerebrus,

Can you expain with sample code, then it is clear for me.

bye
murali@pune

[Cerebrus]

Hi Murali,

The sample code is there in my reply to your original post. Did you try
it ?

Regards,

Cerebrus.

[dickster]

The XmlDocument type has a method

..LoadXml()

You can either load an xml file by passing in the path

..LoadXml("path to xml file")

or XML as a string

..LoadXml("<table></table>")