React Native

XML SearchForAttribute Method

See more XML Examples

Demonstrates the SearchForAttribute method.

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

<root>
    <searchRoot>
        <fruit color="red">apple</fruit>
        <fruit color="green">pear</fruit>
        <veg color="orange">carrot</veg>
        <meat animal="cow">beef</meat>
        <xyz>
            <fruit color="blue">blueberry</fruit>
            <veg color="green">broccoli</veg>
        </xyz>
        <fruit color="purple">grape</fruit>
        <cheese color="yellow">cheddar</cheese>
    </searchRoot>
    <fruit color="red">strawberry</fruit>
    <fruit color="orange">peach</fruit>
</root>

React Native

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

function chilkatExample() {
  let success = false;

  const xml = new Xml();

  success = true;
  try {
    xml.loadXmlFile('qa_data/xml/fruitSearch.xml');
  } catch {
    success = false;
  }
  if (!success) {
    console.log(xml.lastErrorText);
    return;
  }

  // Search the sub-tree rooted at "searchRoot";
  let xSearchRoot = xml.findChild('searchRoot');
  if (!xml.lastMethodSuccess) {
    console.log('searchRoot not found, searching from root.');
    xSearchRoot = xml.getRoot();
  }

  // Search for all "fruit" nodes having a color attribute
  // where the name of the color ends in "e";
  let xBeginAfter = xSearchRoot.getSelf();
  let xFound = xSearchRoot.searchForAttribute('fruit', 'color', '*e', xBeginAfter);
  while (xSearchRoot.lastMethodSuccess) {

    console.log(`${xFound.content}: ${xFound.getAttrValue('color')}`);

    xBeginAfter = xFound;
    xFound = xSearchRoot.searchForAttribute('fruit', 'color', '*e', xBeginAfter);
  }

  // The correct output is:
  // grape: purple
  // blueberry: blue

  console.log('--------------------------');

  // ---------------------------------------------------------------------------------
  // Now do the same, but instead use SearchForAttribute2
  // which updates the internal reference of the caller instead
  // of returning the found node.

  xBeginAfter = xSearchRoot.getSelf();
  const xSearch = xSearchRoot.getSelf();

  success = true;
  try {
    xSearch.searchForAttribute2('fruit', 'color', '*e', xBeginAfter);
  } catch {
    success = false;
  }
  while (success) {

    console.log(`${xSearch.content}: ${xSearch.getAttrValue('color')}`);

    // Copy the internal references so that the next search
    // begins after the found node.
    xBeginAfter.copyRef(xSearch);
    xSearch.copyRef(xSearchRoot);

    success = true;
    try {
      xSearch.searchForAttribute2('fruit', 'color', '*e', xBeginAfter);
    } catch {
      success = false;
    }
  }
}