(Ruby) Find XML Element where Attribute = Value

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Finds an XML element at a particular location where an attribute has a specified value.

Chilkat Ruby Downloads install from rubygems.org gem install chilkat or download... Ruby Library for Windows, MacOS, Linux, Alpine Linux

require 'chilkat'

# We have the following XML and wish to find the value of the time attribute where msg = "alert-from".

# <cdr id="4e5d3e7f41bf6201ad81000c29703270" e164="6207">
#     <user>
#         <grp name="wfln" mode="active"/>
#     </user>
#     <event msg="setup-to" time="287069" e164="5034"/>
#     <event msg="alert-from" time="287069" e164="5034"/>
#     <event msg="rel-to" time="287079" e164="5034"/>
# </cdr>

# First, build the above XML:

xml = Chilkat::CkXml.new()
xml.put_Tag("cdr")
xml.AddAttribute("id","4e5d3e7f41bf6201ad81000c29703270")
xml.AddAttribute("e164","6207")
xml.UpdateAttrAt("user|grp",true,"name","wfln")
xml.UpdateAttrAt("user|grp",true,"mode","active")
xml.UpdateAttrAt("event",true,"msg","setup-to")
xml.UpdateAttrAt("event",true,"time","287069")
xml.UpdateAttrAt("event",true,"e164","5034")
xml.UpdateAttrAt("event[1]",true,"msg","alert-from")
xml.UpdateAttrAt("event[1]",true,"time","287069")
xml.UpdateAttrAt("event[1]",true,"e164","5034")
xml.UpdateAttrAt("event[2]",true,"msg","rel-to")
xml.UpdateAttrAt("event[2]",true,"time","287079")
xml.UpdateAttrAt("event[2]",true,"e164","5034")

# Show that we have the above XML
print xml.getXml() + "\n";

# Find the element where msg = "alert-from"
# This updates the xml object's reference to the found element (if successful).
notUsed = xml.chilkatPath("/A/event,msg,alert-from|$")
if (xml.get_LastMethodSuccess() == false)
    print "Not found." + "\n";
    exit
end

# Get the value of the "time" attribute.
print "time = " + xml.getAttrValue("time") + "\n";

# Restore the xml object's internal reference to the root of the XML document
xml.GetRoot2()