Dart

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. Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // 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:

  final xml = CkXml();
  xml.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());

  // Find the element where msg = "alert-from"
  // This updates the xml object's reference to the found element (if successful).
  final String notUsed;
  try {
    notUsed = xml.chilkatPath('/A/event,msg,alert-from|\$');
  } on ChilkatException {
    print('Not found.');
    return;
  }

  // Get the value of the "time" attribute.
  print('time = ${xml.getAttrValue('time')}');

  // Restore the xml object's internal reference to the root of the XML document
  xml.getRoot2();
}