[Xerte] Problem getting accurate count of pages in framework

Tue Oct 14 17:11:03 BST 2008

So use onInit when the file initialises and onPageOpen everywhere else?

You could address the raw file data fw.XMLElement.childNodes.length, but
I'd try and avoid that if possible. I don't think onPageOpen fires on
the first page.. I'll check.

From: xerte-bounces at lists.nottingham.ac.uk
[mailto:xerte-bounces at lists.nottingham.ac.uk] On Behalf Of Paul Swanson
Sent: Tuesday, October 14, 2008 5:05 PM
To: Xerte discussion list
Subject: RE: [Xerte] Problem getting accurate count of pages in
framework

Thanks Julian 

This getting me closer, but I still have one issue: the onPageOpen event
doesn't seem to fire on the first page of the framework, although it
works correctly on subsequent pages, or when navigating back to the
first page. I'm using the standard framework controls, rather than
having navigation buttons part of the same interaction as the onInit and
onOpenPage events, so the flow goes right into the first page of the
framework. And if I add a script icon with the setText() method, it
still miscounts the number of pages. Any ideas?

I like having the onOpenPage and onClosePage methods. I'm sure I'll be
making good use of those!

________________________________

	From: xerte-bounces at lists.nottingham.ac.uk
[mailto:xerte-bounces at lists.nottingham.ac.uk] On Behalf Of Julian Tenney
	Sent: Tuesday, October 14, 2008 1:36 AM
	To: Xerte discussion list
	Subject: RE: [Xerte] Problem getting accurate count of pages in
framework

	Try this:

	http://www.nottingham.ac.uk/~cczjrt/pswanson.rlo

	From: xerte-bounces at lists.nottingham.ac.uk
[mailto:xerte-bounces at lists.nottingham.ac.uk] On Behalf Of Paul Swanson
	Sent: Monday, October 13, 2008 10:08 PM
	To: Xerte discussion list
	Subject: RE: [Xerte] Problem getting accurate count of pages in
framework

	Here is what I have:

	A page off the Interface page with an id of 'aboutDP' which
contains a framework with an id of aboutDPFrame. The aboutDPFrame has an
Entry Frame, with an onInit event interaction (eventName = onInit, icon
= rootIcon, erase = 0, exit = 1). To this event is attached a script
icon with 'aboutDPpageCount = aboutDPFrame.pages.length;'. The entry
frame also includes a script icon with an id of 'aboutDPCounter'
positioned where I want the page numbers to appear.

	The framework has a number of pages, each with a script icon
(I'll change to the onPageOpen event once I've got the page count
working) with: aboutDPCounter.setText('Page ' +
(aboutDPFrame.currentPage + 1) + ' of ' + aboutDPCount);

	What prints is 'Page 1 of undefined', 'Page 2 of undefined',
etc. So I still must not have the event set up correctly...

	P

________________________________

		From: xerte-bounces at lists.nottingham.ac.uk
[mailto:xerte-bounces at lists.nottingham.ac.uk] On Behalf Of Julian Tenney
		Sent: Monday, October 13, 2008 1:08 PM
		To: Xerte discussion list
		Subject: RE: [Xerte] Problem getting accurate count of
pages in framework

		rootIcon fires onInit; all frameworks fire onPageOpen,

		HTH,

		J

________________________________

		From: xerte-bounces at lists.nottingham.ac.uk on behalf of
Paul Swanson
		Sent: Mon 13/10/2008 18:08
		To: Xerte discussion list
		Subject: RE: [Xerte] Problem getting accurate count of
pages in framework

		I still have not got this to work. What icon id should
be used for the icon property of the Event Interaction? I've tried the
icon id of the framework, the icon id of the page holding the framework,
rootIcon, and the icon id of the first child page of the framework -- in
the first three cases I get 'undefined' as the value of
aboutDPFrame.pages.length, and in the last case I get 0 (which doesn't
surprise me). And should the onPageOpen be within the onInit event, or
should that be a separate event?

		Paul

________________________________

			From: xerte-bounces at lists.nottingham.ac.uk
[mailto:xerte-bounces at lists.nottingham.ac.uk] On Behalf Of Julian Tenney
			Sent: Wednesday, October 08, 2008 2:43 PM
			To: Xerte discussion list
			Subject: RE: [Xerte] Problem getting accurate
count of pages in framework

			An .rlo is an xml tree. It is parsed sideways
like an AW dive. Content is created as each node is encountered:

			//this is really what the engine does...

			function parse(node){ //a node from the .rlo
file's xml

			  //do things with the node - like create an
icon or execute some script

			  //instantiate classes using the information
from the xml node to create icons

			  //icons will intialise before this code
continues

			  //script icons are executed here too, in
engine scope

			  //then loop over each child of node, calling
this function recursively

			  for (var i = 0; i < node.childNodes.length;
i++){

			    parse(node.childNodes[i]);

			  }

			  //decide whether to break or continue?

			}

			As the tree is parsed, the entry frame and it's
content is created. At this point the rest of the framework's xml hasn't
been parsed.

			Flow moves to the next child node of the
framework's xml - the first page. The page is created and it's content's
parsed. The second page hasn't been parsed yet, so 1 of 1 is expected. 

			Only then are the rest of the pages are created
- but - by definition - you cannot place code in page 1 that will
execute afterwards.

			for that very reason there is the onInit event.
This event is broadcast by rootIcon when the initial parse IS complete.
Use this in the entry frame to initialise your interface, and use
onPageClose / onPageOpen rather than have code in each page to set the
interface items. onInit will correct give you fw.pages.lenth, and
onPageClose / onPageOpen are more elegant / easier to maintain than code
on each page.

			J

________________________________

			From: xerte-bounces at lists.nottingham.ac.uk on
behalf of Paul Swanson
			Sent: Wed 08/10/2008 17:53
			To: xerte at lists.nottingham.ac.uk
			Subject: [Xerte] Problem getting accurate count
of pages in framework

			I'm adding a "Page x of y" to a framework, and
I'm not getting the correct value for y (the number of pages in the
framework).

			I'm using an Entry Frame to the framework, and
within that is a text icon with an id of aboutDPCounter. The framework
id is aboutDPFrame. On each page, I include a script icon with the
following:

			aboutDPCounter.setText('Page ' +
(aboutDPFrame.currentPage + 1) + ' of ' + aboutDPFrame.pages.length; 

			When I enter the framework, which currently has
two pages of content, the page counter reads "Page 1 of 1." When I go to
the next page, it reads "Page 2 of 2," and when I back to the first page
it reads "Page 1 of 2." If I then advance to page 2, it reads "Page 2 of
2."

			What's going on? I would expect
myFramework.pages.length would be consistent. It appears as though it
doesn't count the page until you've actually navigated to it.

			_____________________________ 

			 Paul Swanson 
			 Instructional Designer 
			 Harland Financial Solutions 
			 800.274.7280 Ext. 2462 
			 Paul.Swanson at harlandfs.com 
			_____________________________ 

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