From: Matthias Reitinger <reitinge@...>
Date: 2009-03-19T06:56:01+09:00
Subject: Re: REXML get specific element

7stud -- wrote:
> This doesn't work for me:
> 
> <xml version="1.0" encoding="ISO-8859-1"?>
> <programmers>
>         <programmer age="50">Joh'n</programmer>
>         <programmer age="30">Sally</programmer>
> </programmers>
> 
> 
> require 'rexml/document'
> include REXML
> 
> f = File.new('xml4.xml')
> doc = Document.new(f)
> 
> input_name = gets
> input_name = input_name.chomp
> p input_name
> 
> target = XPath.match(doc, "//programmer[text() = $name]", :name => 
> $input_name)
> p target
> 
> puts target[0].attributes["age"]

There are several flaws in your code:  First, $input_name is not the 
same variable as input_name.  Second, according to the REXML 
documentation the variables hash for the XPath query is in fact the 
fourth argument to XPath#match, not the third.  The third one is for the 
namespaces hash.  And lastly, you have to use strings as keys here, not 
symbols (took me some time to figure that one out).  So this does the 
trick:

  require 'rexml/document'
  include REXML

  doc = Document.new(DATA)

  input_name = gets.chomp
  p input_name

  target = XPath.match(doc, "//programmer[text()=$name]", {}, "name" => 
input_name)
  p target

  puts target[0].attributes["age"]

  __END__
  <xml version="1.0" encoding="ISO-8859-1"?>
  <programmers>
    <programmer age="50">John</programmer>
    <programmer age="50">Joh'n</programmer>
    <programmer age="50">Joh"n</programmer>
  </programmers>


-Matthias
-- 
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