Opening and Closing Folders

Let's review the last lines of the initializeDocument function:

//The tree starts in full display
    if (browserVersion > 0) {
    // close the whole tree
    // open the root folder

As you can see, the clickOnNode function does what you'd expect a user's mouse click to do: If a folder is open, clickOnNode closes it, and if the folder is closed, clickOnNode opens it. Let's take a look at it in Example 22-9.

Example 22-9. clickOnNode function
					function clickOnNode(folderId)
  var clickedFolder = 0
  var state = 0

  clickedFolder = indexOfEntries[folderId]
  state = clickedFolder.isOpen ...

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