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Getting a list of Nodes by tag name, starting at a particular Node in the tree...

Posted on 2006-11-14
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Last Modified: 2008-02-01
I'm new to XML. I want to get a list of Nodes by tag name, but starting at some node/depth in the tree - not starting at the top level.

For example, if I have the following simple XML file:

<?xml version="1.0" encoding="ISO-8859-1"?>
<store>
     <item iName="widget1">
          <title> Widget One </title>
          <baseprice> 35.00 </baseprice>
          <repeat> x1 </repeat>
          <repeat> x2 </repeat>
          <repeat> x3 </repeat>
          <more> etc </more>
     </item>

     <item iName="widget2">
          <title> Widget Two </title>
          <baseprice> 1500.00 </baseprice>
          <repeat> y1 </repeat>
          <repeat> y2 </repeat>
          <repeat> y3 </repeat>
          <more> data </more>
     </item>

     <item iName="widget3">
          <title> Widget Three </title>
          <baseprice> 300.00 </baseprice>
     </item>
</store>

and some javascript:

var widget2 = xmlDoc.getElementsByTagName("item")[1];

Can I do something like widget2.getElementsByTagName("repeat") in order to get a list of all the repeat tags within the widget2 tag? In the docs, I don't see any "getElementsByTagName" or similar function in the Node class. Does it only exist at the top level? How do I get a list of tags starting at a particular Node in the tree?
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Question by:Melvinivitch
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Expert Comment

by:ozymandias
ID: 17937175
xmlDoc.SelectNodes("store/item[@iName = 'widget2']/repeat");

This will return an XmlNodeList with all of the repeat nodes under the item with the iName of widget2.
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LVL 60

Expert Comment

by:Geert Bormans
ID: 17937238
Hi Melvinivitch,

Here is what you could do

First you can use SelectNodes to address the node you want to select with XPath
That is a lot more straightforward then using getElementsByTagName.
If you are sure you only want one node instead of a nodelist,
you can use selectSingleNode

You can learn about XPath here
http://www.w3schools.com/xpath/default.asp

var itemNode=oXML.selectNodes("/store/item[@iName = 'widget2']/repeat");

After that you can loop over the nodes like this

                         for (j=0; j<itemNode.length; j++)
                              {
                                  test = test + (itemNode[j].nodeName);
                                  test = test + ("=");
                                  test = test + (itemNode.childNodes[0].nodeValue);
                                  test = test + ("<br />");
                              }          

In this example I write the repeat values in a test string, of course you can use them in your response
The result will be like this
        repeat = y1
        repeat = y2
        repeat = y3            

Cheers!

Geert
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Author Comment

by:Melvinivitch
ID: 17937371
Thanks...

When I use that code: var itemNode=oXML.selectNodes("/store/item[@iName = 'widget2']/repeat");
where oXML is my toplevel xmlDoc object,
and then do: itemNode.childNodes[0].nodeName;
IE gives me this message: "childNodes.0 is null or not an object" ...

Thanks again...
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LVL 15

Expert Comment

by:ozymandias
ID: 17937514
I am guessing that this :

 test = test + (itemNode.childNodes[0].nodeValue);

should be :

 test = test + (itemNode.childNodes[j].nodeValue);
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LVL 60

Accepted Solution

by:
Geert Bormans earned 325 total points
ID: 17937538
no,
should be test = test + (itemNode[j].childNodes[0].nodeValue);

itemNode[j] is the jth <repeat> element (the jth element in your nodelist)

remeber from one of your previous questions:
childNodes[0].nodeValue is there to get at the text value

you are right, there was a bug in my code, but at a different locaton than you thought

To allign with your question
var itemNode=oXML.selectNodes("/store/item[@iName = 'widget2']/repeat");
should be
var itemNode=xmlDoc.selectNodes("/store/item[@iName = 'widget2']/repeat");

cheers

Geert


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Author Comment

by:Melvinivitch
ID: 17940441
Thanks again.
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LVL 60

Expert Comment

by:Geert Bormans
ID: 17940532
welcome
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