React Native

XML Tree Traversal Order for Search* Methods

See more XML Examples

The Chilkat XML API provides a number of Search* methods for locating XML nodes based on criteria. These methods traverse an XML document in a breadth-first order. (See Breadth-First Search).

The XML document used in this example has the following tree structure:

The nodes are traversed in the order: A, B, C, D, E, F, G, H, I, J, K.

The input XML, available at http://www.chilkatsoft.com/data/searchOrder.xml, is this:

<a>crocodileA
    <b>crocodileB
        <d>crocodileD</d>
        <e>crocodileE
            <h>crocodileH</h>
            <i>crocodileI</i>
        </e>
    </b>
    <c>crocodileC
        <f>crocodileF</f>
        <g>crocodileG
            <j>crocodileJ</j>
            <k>crocodileK</k>
        </g>
    </c>
</a>

React Native

import { Xml } from '@chilkat/react-native'

function chilkatExample() {
  const xml = new Xml();

  // The sample input XML is available at http://www.chilkatsoft.com/data/searchOrder.xml
  try {
    xml.loadXmlFile('searchOrder.xml');
  } catch {
    console.log(xml.lastErrorText);
    return;
  }

  // IMPORTANT:  The following loop for iterating over all 
  // matching nodes performs reasonably well for small to 
  // mid-size XML documents or sub-trees.  Performance
  // can be poor when the sub-tree contains many thousands
  // of nodes (or more).

  // NOTE:  The search is always rooted at the calling node.
  // In this example, it happens to also be the root node of the entire
  // XML document.  Searches can be performed on sub-trees
  // within the document by calling the Search* method from
  // the root node of a sub-tree.

  // Demonstrate the breadth-first traversal:
  let xBeginAfter = xml.getSelf();
  let xFound = xml.searchAllForContent('*croc*', xBeginAfter);
  while (xml.lastMethodSuccess) {

    console.log(xFound.tag);

    xBeginAfter = xFound;
    xFound = xml.searchAllForContent('*croc*', xBeginAfter);
  }
}