[Xerte] xerte 2.n - Help needed to remove and then re-duplicateicons

[Kemp Johnathan]

No that's not it.

The page I am trying to create will allow the end user (not the designer who
sets up the wizard) to select options that will decide which questions are
offered to them. This means that each time they reach the "quiz" end and
click restart it will be necessary to as far as is possible get back to the
situation that applied before the page was first run.

The quiz works by taking an icon structure called protoQuestion and
duplicating it to accomodate the number of questions to be displayed.

For my page to work, if built == true, I need to remove all nodes that were
duplications of protoQuestion and then re-duplicate the nodes the number of
times appropriate for the current selections the user has made.

You will get a feel for what I am trying to achieve if you open the project
example I attached to my last email and use the TOC to go to the
randomSequence page. The part of the quiz code that builds the pages is not
run in the getPageID script. The user selections are processed first to
create an array with one element for each "question" "option". The create
questions script then runs to duplicate protoQuestion as many times as is
necessary based on the length of the array. The page works once but fails on
the restart - at present I have removed code that represents early attempts
to remove and re-duplicate the icons.

I have included the quiz page as a simpler example that is closer to the
original script for the quiz page. The only difference being that I have
separated out the part of the getPageId script that makes the pages and
moved it to the end of the icon sequence to just before the Decision icon.
The quiz page still works.

The challenge is to take the code in the "make questions" script of the quiz
page and add an else section to it.
e.g.

if (icon.attributes.built != 'true'){
icon.parentNode.getChildByName("questions").firstChild.duplicate(pageIcon.templateData.learningObject[0].quiz[0].question.length
- 1);

icon.attributes.built = 'true';

}
else {
  // code needed here that will
 // 1. remove all the pages created by the duplication that occurred in the
if section above;
 // 2. duplicate the pages affresh, such that the page still works each time
it is restarted or revisited.
}

If I can find out how to do this it should be straight forward to modify
this so that the code
a) removes all the pages duplicated the last time the page was run
b) duplicates the appropriate number of new pages required to meet the end
users latest selection

which are the requirements of my new wizard.

The quiz page at present can remove nodes and re-create them, but comparison
of the xml of the pages that existed after the initial, build by using
debug, with the new pages created, shows them not to be the same and the
page fails to run correctly in the second running. .i.e. when it is
restarted or revisited.

Is what I am trying to achieve possible? I cannot recall a Xerte page that
actually allows the end user to take actions that effectively allow the end
user to configure in some way the pages structure.

Kind regards

Johnathan


On 9 June 2010 11:30, Julian Tenney <Julian.Tenney at nottingham.ac.uk> wrote:

>  When you’re manipulating xml, I always do:
>
>
>
> If (icon.built != true){
>
>   //manipulate the xml
>
>   icon.built = true;
>
> }
>
>
>
> Then it will only happen once, and bult = true is set on the underlying XML
> node itself. Is that it?
>
>
>
>
>
> *From:* xerte-bounces at lists.nottingham.ac.uk [mailto:
> xerte-bounces at lists.nottingham.ac.uk] *On Behalf Of *Kemp Johnathan
> *Sent:* 09 June 2010 10:08
> *To:* Xerte discussion list
> *Subject:* [Xerte] xerte 2.n - Help needed to remove and then
> re-duplicateicons
>
>
>
> I am working on a new page wizard that is based on the quiz page.
>
>
>
> As part of its functioning it presents the user with an option screen.
>
>
>
> The selections the user makes will decide how many "questions" are
> presented to the user.
>
>
>
> The problem is that whilst I can get the page to run once, if the user then
> clicks on the restart button, or returns to the page at a later time, the
> page will not run correctly a second time as I am not able to successfully
> remove and re-duplicate the "proQuestion" that is the master for all the
> questions that are created at run time.
>
>
>
> Can anyone see what I am doing wrong, or suggest the correct way to achieve
> this?
>
>
>
> I have attached a sample project which includes both a quiz page that
> attempts to remove and re-duplicate the questions each time the page is
> returned to or the Restart button is clicked. If I can get this to work I
> should be able to get the same process to work in my new page.
>
>
>
> The sample project also includes an example of my new page so that you can
> see what I am trying to achieve.
>
>
>
> The idea of the new page is to support music practice where for example the
> end result may be to play a number of different scales with both hands with
> variety of expression and style. Initially practice may be to learn the
> scales playing only the left or right hand, and then later add playing hands
> together, then later add variations of style and expression. Selection of an
> easy level only offers for practice single handed scales. Harder levels then
> introduce double handed play, variation in style and expression.
>
>
>
> In both example pages it is the "make pages" script icon that needs
> attention. The quiz page gives you some idea of what I have tried so far.
>
>
>
> Any help would be most appreciated.
>
>
>
> Kind regards
>
>
>
> Johnathan
>
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>
>
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