===== Chapter 11: XPath containers =====

[[http://niche-canada.org/member-projects/zotero-guide/chapter11.html|HWZT chapter 11 (XPath containers)]]: 

Again, a few changes since HWZT, and again, using its first Scaffold example as an example:

  - Close any running Scaffold 2.0 instances.
  - Ensure the [[http://niche-canada.org/member-projects/zotero-guide/sample1.html|first sample page]] is open in your browser and has focus.
  - Open Scaffold 2.0 from the Firefox main menu with Tools>Scaffold. This should popup dialog="Zotero Scaffold".
  - If you are not already in tab=Metadata, select that. Enter some text in the Label and Creator fields.
  - The URI of the sample page has changed since HWZT, so you will need to enter Target=<code>http://niche-canada.org/member-projects/zotero-guide/</code>
  - Hit button="Test Regex". You should get a result, in the "Test Frame" on the right of the tab, similar to that described in HWZT.
  - Instead of <code>Click on the "Detect Code" tab</code>, click on tab=Code. 
  - In that tab enter <code>function detectWeb(doc, url) {
  var namespace = doc.documentElement.namespaceURI;
  var nsResolver = namespace ? function(prefix) {
    if (prefix == "x" ) return namespace; else return null;
    } : null;
  var myXPath = '//td[1]';
  var myXPathObject = 
    doc.evaluate(myXPath, doc, nsResolver, XPathResult.ANY_TYPE, null).iterateNext().textContent;
  Zotero.debug(myXPathObject);
}</code> 
  - Click on icon="Run detectWeb" (the eye): you should get results like <code>12:00:00 Title:</code>

The code for the second complete Scaffold example (from "Example 11.10") is similarly
<code>function detectWeb(doc, url) {
  var namespace = doc.documentElement.namespaceURI;
  var nsResolver = namespace ? function(prefix) {
    if (prefix == "x" ) return namespace; else return null;
    } : null;
  var myXPath = '//div[@id="Content"]/div/table[@class="Bibrec"]/tbody/tr/td[1][@class="Label"]';
  var myXPathObject = doc.evaluate(myXPath, doc, nsResolver, XPathResult.ANY_TYPE, null);
  var items = new Object();
  var headers;
  while (headers = myXPathObject.iterateNext()) {
    items[headers.textContent]='';
  }
  Zotero.debug(items);
}
</code> Click on icon="Run detectWeb" (the eye): you should get results like <code>12:00:00 'Title:' => ""
  'PrincipalAuthor:' => ""
  'Imprint:' => ""
  'Subjects:' => ""
  '' => ""
  'ISBN-10:' => ""
  'Collection:' => ""
  'Pages:' => ""
</code>

**Next**: [[dev/How to Write a Zotero Translator, 2nd Edition/Chapter 12|Chapter 12: Regular Expressions]]