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Perform the following three XPath queries on the XML Document below: |
Perform the following three XPath queries on the XML Document below: |
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Line 87: | Line 87: | ||
</cfsavecontent> |
</cfsavecontent> |
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<cfset xml = xmlParse(xmlString)> |
<cfset xml = xmlParse(xmlString)> |
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<!--- First Task ---> |
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<cfset itemSearch = xmlSearch(xml, "//item")> |
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<!--- item = the first Item (xml element object) ---> |
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<cfset item = itemSearch[1]> |
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<!--- Second Task ---> |
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<cfset priceSearch = xmlSearch(xml, "//price")> |
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<!--- loop and print each price ---> |
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<cfloop from="1" to="#arrayLen(priceSearch)#" index="i"> |
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#priceSearch[i].xmlText#<br/> |
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</cfloop> |
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<!--- Third Task ---> |
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<!--- array of all the name elements ---> |
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<cfset names = xmlSearch(xml, "//name")> |
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<!--- visualize the results ---> |
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<cfdump var="#variables#"> |
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==[[JavaScript]]== |
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[[Category:JavaScript]] |
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'''Interpreter:''' Firefox 2.0 |
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//create XMLDocument object from file |
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var xhr = new XMLHttpRequest(); |
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xhr.open('GET', 'file.xml', false); |
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xhr.send(null); |
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var doc = xhr.responseXML; |
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//get first <item> element |
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var firstItem = doc.evaluate( '//item[1]', doc, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null ).singleNodeValue; |
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alert( firstItem.textContent ); |
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//output contents of <price> elements |
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var prices = doc.evaluate( '//price', doc, null, XPathResult.ANY_TYPE, null ); |
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for( var price = prices.iterateNext(); price != null; price = prices.iterateNext() ) { |
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alert( price.textContent ); |
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} |
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//add <name> elements to array |
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var names = doc.evaluate( '//name', doc, null, XPathResult.ANY_TYPE, null); |
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var namesArray = []; |
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for( var name = names.iterateNext(); name != null; name = names.iterateNext() ) { |
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namesArray.push( name ); |
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} |
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alert( namesArray ); |
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Although some browsers support XPath, working with XML is much easier with E4X. |
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//create XML object from file |
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var xhr = new XMLHttpRequest(); |
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xhr.open('GET', 'file.xml', false); |
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xhr.send(null); |
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var doc = new XML(xhr.responseText); |
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//get first <item> element |
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var firstItem = doc..item[0]; |
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alert( firstItem ); |
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//output contents of <price> elements |
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for each( var price in doc..price ) { |
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alert( price ); |
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} |
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//add <name> elements to array |
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var names = []; |
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for each( var name in doc..name ) { |
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names.push( name ); |
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} |
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alert( names ); |
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==[[Perl]]== |
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[[Category:Perl]] |
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use XML::XPath qw(); |
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my $x = XML::XPath->new('<inventory ... </inventory>'); |
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[$x->findnodes('//item[1]')->get_nodelist]->[0]; |
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print $x->findnodes_as_string('//price'); |
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$x->findnodes('//name')->get_nodelist; |
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==[[PHP]]== |
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[[Category:PHP]] |
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<?php |
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//PHP5 only example due to changes in XML extensions between version 4 and 5 (Tested on PHP5.2.0) |
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$doc = DOMDocument::loadXML('<inventory title="OmniCorp Store #45x10^3">...</inventory>'); |
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//Load from file instead with $doc = DOMDocument::load('filename'); |
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$xpath = new DOMXPath($doc); |
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/* |
|||
1st Task: Retrieve the first "item" element |
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*/ |
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$nodelist = $xpath->query('//item'); |
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$result = $nodelist->item(0); |
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/* |
|||
2nd task: Perform an action on each "price" element (print it out) |
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*/ |
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$nodelist = $xpath->query('//price'); |
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for($i = 0; $i < $nodelist->length; $i++) |
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{ |
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//print each price element in the DOMNodeList instance, $nodelist, as text/xml followed by a newline |
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print $doc->saveXML($nodelist->item($i))."\n"; |
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} |
|||
/* |
|||
3rd Task: Get an array of all the "name" elements |
|||
*/ |
|||
$nodelist = $xpath->query('//name'); |
|||
//our array to hold all the name elements, though in practice you'd probably not need to do this and simply use the DOMNodeList |
|||
$result = array(); |
|||
//a different way of iterating through the DOMNodeList |
|||
foreach($nodelist as $node) |
|||
{ |
|||
$result[] = $node; |
|||
} |
|||
==[[Ruby]]== |
|||
[[Category:Ruby]] |
|||
#Example taken from the REXML tutorial (http://www.germane-software.com/software/rexml/docs/tutorial.html) |
|||
require "rexml/document" |
|||
include REXML |
|||
#create the REXML Document from the string (%q is Ruby's multiline string, everything between the two @-characters is the string) |
|||
doc = Document.new( |
|||
%q@<inventory title="OmniCorp Store #45x10^3"> |
|||
... |
|||
</inventory> |
|||
@ |
|||
) |
|||
# The invisibility cream is the first <item> |
|||
invisibility = XPath.first( doc, "//item" ) |
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# Prints out all of the prices |
|||
XPath.each( doc, "//price") { |element| puts element.text } |
|||
# Gets an array of all of the "name" elements in the document. |
|||
names = XPath.match( doc, "//name" ) |