Web Services, Part IX: Pattern-Based XML Node Selection: Context Definition (B) - Doc JavaScript

Web Services, Part IX: Pattern-Based XML Node Selection

Context Definition - Part B

The fourth node of mydvd7.xml is where the data tree hangs. The name of the top-level child is sales (xmlDoc.childNodes[3].nodeName), from the sales tag:

<sales>
  .
  .
  .
</sales>

The sales node has two child nodes:

• summary (xmlDoc.childNodes[3].childNodes[0].nodeName)
• data (xmlDoc.childNodes[3].childNodes[1].nodeName)

The summary node has five child nodes:

• heading (xmlDoc.childNodes[3].childNodes[0].childNodes[0].nodeName)
• subhead (xmlDoc.childNodes[3].childNodes[0].childNodes[1].nodeName)
• description (xmlDoc.childNodes[3].childNodes[0].childNodes[2].nodeName)
• author (xmlDoc.childNodes[3].childNodes[0].childNodes[3].nodeName)
• date (xmlDoc.childNodes[3].childNodes[0].childNodes[4].nodeName)

The summary's child nodes do not have any lower-level child nodes. The data node is the root of a much deeper tree, as it holds the actual data of the dvds. The data node has three child nodes, one for every month of the report:

• month (January) (xmlDoc.childNodes[3].childNodes[1].childNodes[0].nodeName)
• month (February) (xmlDoc.childNodes[3].childNodes[1].childNodes[1].nodeName)
• month (March) (xmlDoc.childNodes[3].childNodes[1].childNodes[2].nodeName)

Each month has five child nodes: one for its name and four for its four week proceeds. Here are the child nodes of January:

• name (xmlDoc.childNodes[3].childNodes[1].childNodes[0].childNodes[0].nodeName)
• week (xmlDoc.childNodes[3].childNodes[1].childNodes[0].childNodes[1].nodeName)
• week (xmlDoc.childNodes[3].childNodes[1].childNodes[0].childNodes[2].nodeName)
• week (xmlDoc.childNodes[3].childNodes[1].childNodes[0].childNodes[3].nodeName)
• week (xmlDoc.childNodes[3].childNodes[1].childNodes[0].childNodes[4].nodeName)

Similarly, here are the child nodes of February:

• name (xmlDoc.childNodes[3].childNodes[1].childNodes[1].childNodes[0].nodeName)
• week (xmlDoc.childNodes[3].childNodes[1].childNodes[1].childNodes[1].nodeName)
• week (xmlDoc.childNodes[3].childNodes[1].childNodes[1].childNodes[2].nodeName)
• week (xmlDoc.childNodes[3].childNodes[1].childNodes[1].childNodes[3].nodeName)
• week (xmlDoc.childNodes[3].childNodes[1].childNodes[1].childNodes[4].nodeName)

March's three child nodes are:

• name (xmlDoc.childNodes[3].childNodes[1].childNodes[2].childNodes[0].nodeName)
• week (xmlDoc.childNodes[3].childNodes[1].childNodes[2].childNodes[1].nodeName)
• week (xmlDoc.childNodes[3].childNodes[1].childNodes[2].childNodes[2].nodeName)
• week (xmlDoc.childNodes[3].childNodes[1].childNodes[2].childNodes[3].nodeName)
• week (xmlDoc.childNodes[3].childNodes[1].childNodes[2].childNodes[4].nodeName)

The name nodes have child nodes of their own, one per node. They hold the name's text property:

• January (xmlDoc.childNodes[3].childNodes[1].childNodes[0].childNodes[0].childNodes[0].text)
• February (xmlDoc.childNodes[3].childNodes[1].childNodes[0].childNodes[1].childNodes[0].text)
• March (xmlDoc.childNodes[3].childNodes[1].childNodes[0].childNodes[2].childNodes[0].text)

Next: How to select nodes

Produced by Yehuda Shiran and Tomer Shiran
All Rights Reserved. Legal Notices.
Created: February 25, 2002
Revised: February 25, 2002

URL: https://www.webreference.com/js/column104/3.html