Select Lists - Setting and Referencing (Using) the Select List variable

I have (a login page and) 3 application pages (call them Day, Week, Month), each with similar selection lists and a chart. I have three requirements.
1) When a new selection is made, the value of the selection list variable is updated --that is, it does what select lists do.
2) I need to set the value of the Month selection list variable before the Month page is rendered for the first time -- I need to give it an initial value.
3) When navigating from page to page, say from Month to Week or Day back to Month, I need to have the value of the selection list variable carried to the new page from the value on the previous page.
It sounds simple to me -- something that one could do with an (global) application item. The logic would be like
IF :Page_Name_Flag = 'Week' THEN -- staying on the Week page
SELECT :WK_SelectList_Name INTO :GLOBAL_SelectList_Name FROM DUAL
ELSE -- new pass on this page
SELECT :GLOBAL_SelectList_Name INTO :WK_SelectList_Name FROM DUAL
SELECT 'Week' INTO :Page_Name_Flag
END IF;But that doesn't work for me. The page's select list variable seems to be NULL sometimes causing the value of :GLOBAL_SelectList_Name to be set to null. Other times, the copy from the global variable to page select list varable doesn't seem to change the page select list variable.
At http://apex.oracle.com/pls/apex/f?p=43250:101 (guest/Ima9Gue8t) is an example where I have each page's select list working (except on the initial visit to the page, where the select variable is null!!!). How can I get the select list value on the new page to sync with the value from the previous page?
Thanks,
Howard
Edited by: Howard (DBA in Training) on Sep 18, 2012 11:53 AM

I'm closing this because I got it to work. In the end, it worked as I had described above. There was some setting of the Select List variable, that I now have correct, that was incorrect before. I wonder what it was?

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SammyP wrote:
I have to write a program that sorts a Vector using the selection sort algorithm...Hmmm.... Your teacher is, in my humble opinion, a bit of a tard.
1. Vector is basically deprecated in favor of newer implementations of the List interface which where introduced in [the collections framework|http://java.sun.com/docs/books/tutorial/collections/index.html] with Java 1.5 (which became generally available back in May 2004, and went end-of-support Oct 2009). ArrayList is very nearly a "drop in" replacement for Vector, and it is much better designed, and is marginally more efficient, mainly because it is not syncronised, which imposes a small but fundamentally pointless overhead when the collection is not being accessed across multiple threads (as is the case in your program).
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Note that String implements [Comparable<String>|http://java.sun.com/javase/6/docs/api/java/lang/Comparable.html], so two String's can safely be compared using the compareTo method... In Java the mathematical operators (<, >, +, -, /, *, etc) are only applicable to the primitive types (byte char, int, float, etc)... The Java Gods just chose to muddy the waters (especially for noobs) by "overloading" the + operator for String (and String only) to enable succinct, convenient string-concatenation... which I personally now see as "a little bit of a mistake" on there part.
 private static void selectionSort(Vector parts) {
int index, smallestIndex, minIndex, temp = 0;
for (index = 0; index < parts.size() - 1; index++) {
smallestIndex = index;
for (minIndex = index + 1; minIndex < parts.size(); minIndex++) {
if (parts.elementAt(minIndex) < parts.elementAt(smallestIndex)) {
smallestIndex = minIndex;
parts.setElementAt(temp, smallestIndex);
parts.setElementAt(smallestIndex, index);
parts.setElementAt(index, temp);
}3. ALLWAYS use {curly braces}, even when not strictly necessary for correctness, because (a) they help make your code more readable to humans, and also (b) if you leave them out, you will eventually stuff it up when you insert a line in the expectation that it will be part of the if statement (for example) but you forgot to also add the now mandatory curly-braces... This is far-too-common source of bugs in noob-code. Almost all professionals, nearly allways allways use curly braces, most of the time ;-)
4. Variable names should be meaningful, except (IMHO) for loop counters... Ergo: I'd rename index plain old i, and minIndex to plain old j
 for ( int i=0; i<list.size()-1; ++i) {
 int wee = i; // wee is the index of the smallest-known-item in list.
 for ( int j=i+1; j<list.size(); ++j ) {Cheers. Keith.
Edited by: corlettk on 28/11/2009 09:49 ~~ This here fraggin forum markup friggin sucks!

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