Get all children elements by an element attribute in an XML file using Dart / Flutter xml package-CodePudding

This is an XML example of what i'm trying to achieve:

<bookshelf>
  <book id="1">
    <title lang="en">Growing a Language</title>
    <chapter number="1">What's a Language?</chapter>
    <chapter number="2">Basics</chapter>
    <chapter number="3">Examples</chapter>
    <chapter number="4">Exam</chapter>
  </book>
  <book id="2">
    <title lang="en">Learning XML</title>
    <chapter number="1">What's XML?</chapter>
    <chapter number="2">Theory</chapter>
  </book>
  <book id="3">
    <title lang="en">Personal Computer</title>
    <chapter number="1">What's a PC?</chapter>
    <chapter number="2">Hardware</chapter>
    <chapter number="3">Operating system</chapter>
  </book>
</bookshelf>

Is there a way to get all the elements values given the book id number? something like:

document.getElement("bookshelf")?.getElement("book id=\"2\"")?.findAllElements("chapter").map((node) => node.firstChild).forEach(print);

CodePudding user response：

Use the xml package, and parse the input to an XmlDocument. Then navigate through it using findElements to find the right child elements.

These return iterators, so you can use standard methods like first and where.

So, for example:

  final doc = XmlDocument.parse(input);
  doc
      .findElements('bookshelf')
      .first
      .findElements('book')
      .where((e) => e.getAttribute('id') == '2')
      .forEach(print);

Depending on the structure of your XML, you may be able to skip finding the bookshelf and first by using findAllElements('book')

CodePudding user response：

you can use xml2json package for converting json. enter link description here

In this link, i made an example.